MSML/MOML Media Server

Software
User’s Guide
June 2006

05-2513-001-02
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MSML/MOML Media Server Software User’s Guide

Contents

1 MSML/MOML media server software Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.2 Media Server Operating Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.1 media_server Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2 mediaserver Configuration Script . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3 Sample Use Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 Use Case Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 MSML/MOML Control Syntax in Use Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.2.1 Establish Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.2.2 Play Main Prompt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.2.3 Play Video Portal Prompt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2.4 Play Video Clip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.2.5 Record Message. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.2.6 Replay Main Prompt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.2.7 Terminate Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4 Feature Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1 MSML Feature Support Matrix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.2 MOML Feature Support Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5 Deviations from IETF Drafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

6 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.2 Logging Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.2.1 Configuration File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.2.2 Logging Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.2.3 Client Categories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.3 Log File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
A MSML Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
A.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
A.2 MSML Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
A.2.1 <msml> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
A.2.2 <send> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
A.2.3 <result> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
A.2.4 <event> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
A.3 Stream Manipulation Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
A.3.1 <join> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
A.3.2 <modifystream> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
A.3.3 <unjoin> . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
A.4 Conference Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
A.5 Dialog Elements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

MSML/MOML Media Server Software User’s Guide 3

Contents

A.5.1 <dialogstart > . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

A.5.2 <dialogend > . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
A.6 Receiving Events from a Client. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
A.7 Sending Events and Transaction Results to a Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
A.7.1 Transaction Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
A.7.2 Events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
A.8 Media Server Object Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
A.8.1 Network Connections (conn) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
A.8.2 Conference (conf) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
A.8.3 Dialog (dialog) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
A.8.4 Operator (oper) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
B MOML Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
B.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
B.2 Primitives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
B.2.1 Recognizers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
B.2.2 Transformers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
B.2.3 Sources and Sinks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
B.3 Reference to Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

4 MSML/MOML Media Server Software User’s Guide

 Contents

Figures

1 Media Server Operating Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2 Audio/Video Play/Record Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3 Network Connection Creation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

MSML/MOML Media Server Software User’s Guide 5

 Contents

Tables

1 MSML Feature Support Matrix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2 MOML Feature Support Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

MSML/MOML Media Server Software User’s Guide 6

Revision History

This revision history summarizes the changes made in each published version of this document.

Document No. Publication Date Description of Revisions

05-2513-001-02 June 2006 Updates for diagnostics integration with RTF.

05-2513-001-01 April 2006 Initial version of document.

MSML/MOML Media Server Software User’s Guide 7

Revision History

8 MSML/MOML Media Server Software User’s Guide

About This Publication

The following topics provide information about this publication.

• Purpose
• Scope
• Intended Audience
• How to Use This Publication
• Related Information

Purpose

This publication documents the Media Sessions Markup Language/Media Objects Markup
Language (MSML/MOML) Media Control Interface software that provides an interface between
an Application Server (AS) and a Media Server (MS).

This publication is for users of the MSML/MOML media server software who are writing
applications that require remote control of MS resources.

Scope

The MSML/MOML media server software functionality is being introduced in a phased approach.
This manual documents the functionality provided by the current implementation phase, which
includes support for:
• MSML Core Module
• MSML Stream Management Module (conferencing is not included)
• MSML Dialog Module
• MOML Core Module
• MOML Group Module (parallel topology only)
• MOML Basic Primitives Module
• MOML Transform Primitives Module (gain only)

Functionality that is not supported by the current implementation phase includes:

• MSML Stream Management Module (audio and video conferencing)
• MOML Speech Module
• MOML Fax Module

Future implementation phases are planned that will provide additional MSML/MOML support.

MSML/MOML Media Server Software User’s Guide 9

About This Publication

Intended Audience

This publication is for:

• System Integrators
• Independent Software Vendors (ISVs)
• Value Added Resellers (VARs)
• Original Equipment Manufacturers (OEMs)

This publication assumes that the reader is familiar with the Session Initiation Protocol (SIP).

How to Use This Publication

This manual is divided into the following sections:

• Chapter 1, “MSML/MOML media server software Overview” describes the role of the
MSML/MOML media server software in a Media Server environment.
• Chapter 2, “Configuration” explains how to configure the MSML/MOML media server
software for operation on a Media Server.
• Chapter 3, “Sample Use Case” presents an application that demonstrates many of the features
currently supported by the MSML/MOML media server software.
• Chapter 4, “Feature Support” identifies which elements, attributes, events and shadow
variables (as documented in the MSML and MOML IETF drafts) are currently supported or
not supported by the MSML/MOML media server software.
• Chapter 5, “Deviations from IETF Drafts” explains any deviations from the MSML and
MOML IETF drafts.
• Chapter 6, “Diagnostics” describes the logging capabilities available to the MSML/MOML
media server software for diagnostic purposes.
• Appendix A, “MSML Overview” provides a high-level introduction to MSML.
• Appendix B, “MOML Overview” provides a high-level introduction to MOML.
• A Glossary can be found at the end of the document.

Related Information

Refer to the following documents and web sites for more information about developing
applications that use the MSML/MOML media server software:
• Media Sessions Markup Language (MSML), Internet Engineering Task Force (IETF),
draft-melanchuk-sipping-msml-06, October 21, 2005
• Media Objects Markup Language (MOML), Internet Engineering Task Force (IETF),
draft-melanchuk-sipping-moml-06, October 21, 2005
• http://developer.intel.com/design/telecom/support/ (for technical support)
• http://www.intel.com/network/csp/ (for product information)

10 MSML/MOML Media Server Software User’s Guide

MSML/MOML media server
1. 1
software Overview

This chapter provides an overview of the MSML/MOML media server software. Topics include:
• Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
• Media Server Operating Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.1 Introduction
The MSML/MOML media server software has been designed and implemented as an integral part
of the system software provided by Intel (for example, NetStructure® Host Media Processing
Software or Titusville 2 system software).

When the system software is installed on a Media Server (MS), the MSML/MOML media server
software enables a remote client, also known as an.Application Server (AS), to control media
resources.

The MSML/MOML media server software is based on the evolving MSML and MOML languages,
as defined in their respective IETF drafts. The current implementation is based on Media Sessions
Markup Language (MSML) IETF Draft version -06 and Media Objects Markup Language
(MOML) IETF Draft version -06.
Note: A new draft, called the Media Server Markup Language (draft-saleem-msml-00), which combines
the separate MSML and MOML drafts, was submitted to IETF on February 26, 2006. According to
the combined draft authors, little or no change was introduced in the latest draft when compared to
the separate MSML and MOML version 6 drafts.

The connection between the AS and MS is established using the SIP protocol, thereafter media
control commands/responses (in the form of MSML/MOML control syntax) are exchanged in SIP
messages, such as the INFO message or the 200 OK response.

1.2 Media Server Operating Model

Figure 1 shows an environment where the Media Server (MS) and Application Server (AS) operate
as separate entities. The MSML/MOML media server software software runs on the MS and
provides the interface between the AS and the MS as shown. The MS is responsible for media
processing only; call control is the responsibility of the AS.

The AS, as an MSML/MOML client, must be capable of interpreting and generating

MSML/MOML control syntax and must support the SIP INVITE, 200 OK, ACK, BYE and INFO
messages at a minimum.

MSML/MOML Media Server Software User’s Guide 11

MSML/MOML media server software Overview

Figure 1. Media Server Operating Environment

IP
Endpoint

Media (RTP) Call Control (SIP)

MSML/MOML
Media Control Interface

IP Media Server Application Server

MSML/MOML Server MSML/MOML Client

12 MSML/MOML Media Server Software User’s Guide

Configuration
2. 2
This chapter describes how to configure a Media Server to use the MSML/MOML media server
software. Topics include:
• media_server Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
• mediaserver Configuration Script . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

2.1 media_server Application

The media_server application runs on the Media Server and provides the MSML/MOML media
server software functionality. The media_server application can be configured using the
mediaserver configuration script as described in the following section.

2.2 mediaserver Configuration Script

The mediaserver configuration script is used to enable/disable and start/stop the media_server
application and is located in the dialogic/bin directory.

The mediaserver configuration script provides the following options:

mediaserver enable
Enables the media_server application. All subsequent calls to dlstart start the media_server
application. All subsequent calls to dlstop stop the media_server application.
mediaserver disable
Disables the media_server application. Subsequent calls to dlstart do not start the
media_server application.
mediaserver start
Starts the media_server application. The media_server application must be started after dlstart
successfully completes.
mediaserver stop
Stops the media_server application.

MSML/MOML Media Server Software User’s Guide 13

Configuration

14 MSML/MOML Media Server Software User’s Guide

Sample Use Case
3. 3
This chapter describes a simple application that demonstrates many of the capabilities provided by
the current version of the MSML/MOML media server software. Topics include:
• Use Case Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
• MSML/MOML Control Syntax in Use Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.1 Use Case Description

In this application, the user is presented with options to play and record audio and video
clips/messages. The Application Server (AS) communicates with the Media Server (MS) using the
MSML/MOML media server software to perform the selected operations. Figure 2 shows the
exchange of SIP messages between the SIP client, Application Server (AS) and Media Server (MS)
to perform the functionality required. Many of the messages exchanged between the AS and MS
include MSML/MOML control syntax that are interpreted and acted upon by the MSML/MOML
media server software.

The following sequence describes the high-level activities from the SIP client and Media Server
(MS) perspectives:
1. The SIP client initiates a SIP dialog with the AS and a media session with the MS.
2. The MS plays the Main Prompt with options for the playing of prerecorded clips of News,
Weather, Messages, Image of Your Daily Schedule, or the recording of a audio-visual
message. The MS then waits on DTMF detection. The MS waits forever and never
disconnects, unless a BYE is issued or unless AS timers set a limit on call length.
3. The SIP client makes a selection using DTMF. The selection is to display the Video Portal
Prompt.
4. The MS plays the Video Portal Prompt.
5. The SIP client makes a selection using DTMF. The selection is to play a video.
6. The MS plays the selected video clip to completion.
7. The MS plays the Main Prompt.
8. The SIP client makes a selection using DTMF. The selection is to record, then play back, a
video message.
9. The MS records the video message.
10. The SIP client stops the recording of the video message with any DTMF.
11. The MS starts the playback of the recorded video message (executed in MxML syntax).
12. The MS plays the recorded video message to completion.
13. The MS plays the Main Prompt.
14. The SIP client disconnects.
15. The MS disconnects.

MSML/MOML Media Server Software User’s Guide 15

Sample Use Case

Figure 2. Audio/Video Play/Record Scenario

SIP Agent Application Server Media Server

(1.1.1.20) (1.1.1.12) (1.1.1.40)
INVITE 1a
100 Trying 1b
INVITE 1c
180 Ringing 1d
180 Ringing 1e
1. Establish Connections
200 OK 1f
ACK 1g
200 OK 1h
ACK 1i

RTP Established
INFO (Main Prompt Dialog Start) 2a
2. Play Main Prompt
200 OK (Main Prompt) 2b

DTMF Selection
INFO (DTMF Detect Event) 3a
200 OK (DTMF Detect Event) 3b
INFO (Main Prompt Dialog Exit) 3c
200 OK (Main Prompt Dialog Exit) 3d 3. Play Video Portal Prompt
INFO (Video Portal Dialog Start) 3e
200 OK (Portal Prompt) 3f
DTMF Selection
INFO (DTMF Detect Event) 4a
200 OK (DTMF Detect Event) 4b
INFO (Video Portal Dialog Exit) 4c
200 OK (Video Portal Dialog Exit) 4d
INFO (Video Clip Start) 4e
4. Play Video Clip
200 OK (Video Clip Start) 4f
INFO (Video Clip Dialog Exit) 4g
200 OK (Video Clip Dialog Exit) 4h
INFO (Main Prompt Dialog Start) 4i
200 OK (Main Prompt) 4j
DTMF Selection
INFO (DTMF Detect Event) 5a
200 OK (DTMF Detect Event) 5b
INFO (Main Prompt Dialog Exit) 5c
200 OK (Main Prompt Dialog Exit) 5d 5. Record Message
INFO (Record Message) 5e
200 OK (Record Message) 5f
DTMF Record Termination

(***** MxML control syntax automatically begins playback *****)

INFO (Message Dialog Exit) 6a
200 OK (Message Dialog Exit) 6b 6. Replay Main Prompt
INFO (Main Prompt Dialog Start) 6c
200 OK (Main Prompt) 6d
BYE 7a
BYE 7b
200 OK 7c 7. Terminate Connections
200 OK 7d

16 MSML/MOML Media Server Software User’s Guide

 Sample Use Case

3.2 MSML/MOML Control Syntax in Use Case

Figure 2 includes labels to identify the SIP messages exchanged among the SIP client, Application
Server (AS) and Media Server (MS). For easier reference, the main steps are designated with
numbers and subordinate steps are designated with lowercase letters. The following sections
describe the steps (and subordinate steps) with particular emphasis on the MSML/MOML control
syntax included in the exchanged messages. The main steps are:
• Establish Connections
• Play Main Prompt
• Play Video Portal Prompt
• Play Video Clip
• Record Message
• Replay Main Prompt
• Terminate Connections
Note: In the subsections following, the first SIP INFO message (in Section 3.2.2) is shown in its entirety
to highlight the fact that the AS must set the “Content-Type” and “Content-Length” in the SIP
header. For the remaining SIP messages, the SIP headers are not included since the focus is on the
MSML/MOML control syntax.

3.2.1 Establish Connections

Steps 1a to 1i
These steps comprise standard SIP message exchange for the establishment of SIP dialogs
between the SIP client and AS and between AS and MS and the establishment of a media
session (RTP) between the SIP client and MS. It is over the RTP connection that the user
responds to prompts using DTMF selections. There is no MSML/MOML control syntax
involved in this message exchange.
However, one important piece of information received by the AS in Step 1f is the
network connection identifier that is assigned by the MS. The identifier is the “tag” value
included in the “To” header of the SIP 200 OK response to the initial INVITE sent by the AS.
In this example, the “To” header is:
To:<sip:1.1.1.12>;tag=b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2

In MSML/MOML control syntax, the connection identifier is specified as “conn:<tag value>”.

In the sample control syntax in Section 3.2.2 to Section 3.2.6, the network connection
identifier is shown in bold text.

3.2.2 Play Main Prompt

Step 2a
The AS sends the MS an INFO message to play the Main Prompt dialog. The complete INFO
message shown below includes MSML/MOML control syntax:

MSML/MOML Media Server Software User’s Guide 17

Sample Use Case

INFO sip:AS@1.1.1.40:5060 SIP/2.0

Call-ID: ae11d01e-7350-462d-8a9e-169c79d7361a@1.1.1.20
From: "Administrator" <sip:WINDOWS-E6UOEQY>;tag=-1179327240.1.bababamaggmjjhbgpgjfogkj
To: <sip:1.1.1.12>;tag=b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2
CSeq: 3 INFO
Contact: sip:1.1.1.12:5060
Content-Type: text/xml;charset=UTF-8
Content-Length:709
Max-Forwards: 70
Via: SIP/2.0/UDP 1.1.1.12:5070;branch=z9hG4bK0101010CBADF00D00000109F178B4485

<?xml version="1.0" encoding="UTF-8" ?>

<msml version="1.0">
<dialogstart target="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2"
type="application/moml+xml">
<group topology="parallel" >
<play>
<media>
<video uri="file://./av/main_menu.vid" format="video/raw:codecs=h263" />
<audio uri="file://./av/main_menu.pcm" format="audio/pcm:codecs=mulaw"
audiosamplesize="8" audiosamplerate="8"/>
</media>
</play>
<collect iterate="forever" cleardb="true">
<detect>
<send target="source" event="done" namelist="dtmf.digits" />
<send target="group" event="terminate"/>
</detect>
</collect>
</group>
</dialogstart>
</msml>

Step 2b
The MS sends a 200 OK response to indicate success. The 200 OK response includes the
following MSML/MOML control syntax:
<msml version="1.0">
<result response="200"/>
<dialogid>conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:10</dialogid>
</msml>

3.2.3 Play Video Portal Prompt

Step 3a
At this point, the SIP client makes a selection that is transmitted as DTMF to the MS. The
selection is to display the Video Portal Prompt dialog. The MS sends the AS an INFO
message that includes the following MSML/MOML control syntax describing the DTMF
Detect event.
<msml version="1.0">
<event name="done"
id="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:10">
<name>dtmf.digits</name><value>1</value>
</event>
</msml>

18 MSML/MOML Media Server Software User’s Guide

 Sample Use Case

Step 3b
The AS sends a 200 OK response to the MS to acknowledge successful receipt of the DTMF
Detect event. The 200 OK response does not includes any MSML/MOML control syntax.
Step 3c
The MS sends the AS an INFO message with the following MSML/MOML control syntax to
indicate that the Main Prompt dialog is exiting.
<msml version="1.0">
<event name="msml.dialog.exit"
id="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:10"/>
</msml>

Step 3d
The AS sends a 200 OK response to the MS to acknowledge Main Prompt dialog exit. The
200 OK response does not contain any MSML/MOML control syntax.
Step 3e
The AS sends the MS an INFO message to start playing the Video Portal Prompt dialog. The
INFO message includes the following MSML/MOML control syntax:
<?xml version="1.0" encoding="UTF-8" ?>
<msml version="1.0">
<dialogstart target="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2"
type="application/moml+xml">
<group topology="parallel" >
<play>
<media>
<video uri="file://./av/vportal_menu.vid" format="video/raw:codecs=h263" />
<audio uri="file://./av/vportal_menu.pcm" format="audio/pcm:codecs=mulaw"
audiosamplesize="8" audiosamplerate="8"/>
</media>
</play>
<collect iterate="forever" cleardb="true">
<detect>
<send target="source" event="done" namelist="dtmf.digits dtmf.len dtmf.end
dtmf.last" />
<send target="group" event="terminate"/>
</detect>
</collect>
</group>
</dialogstart>
</msml>

Step 3f
The MS sends a 200 OK response to the AS to acknowledge the starting of the Video Portal
Prompt dialog. The 200 OK response includes the following MSML/MOML control syntax:
<msml version="1.0">
<result response="200"/>
<dialogid>conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:13</dialogid>
</msml>

MSML/MOML Media Server Software User’s Guide 19

Sample Use Case

3.2.4 Play Video Clip

Step 4a
At this point, the SIP client makes a selection that is transmitted as DTMF to the MS. The
selection is to play a Video Clip. The MS sends the AS an INFO message that includes the
following MSML/MOML control syntax describing the DTMF Detect event.
<msml version="1.0">
<event name="done"
id="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:13">
<name>dtmf.digits</name><value>2</value>
<name>dtmf.end</name><value>dtmf.detect</value>
<name>dtmf.last</name><value>2</value>
<name>dtmf.len</name><value>1</value>
</event>
</msml>

Step 4b
The AS sends a 200 OK response to the MS to acknowledge successful receipt of the DTMF
Detect event. The 200 OK response does not includes any MSML/MOML control syntax.
Step 4c
The MS sends the AS an INFO message with the following MSML/MOML control syntax to
indicate that the Video Portal Prompt dialog is exiting (a response to the DTMF Detect
event).
<msml version="1.0">
<event name="msml.dialog.exit"
id="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:13"/>
</msml>

Step 4d
The AS sends a 200 OK response to the MS to acknowledge Video Portal Prompt dialog exit.
The 200 OK response does not contain any MSML/MOML control syntax.
Step 4e
The AS sends the MS an INFO message that includes the following MSML/MOML control
syntax to start the Video Clip (a response to the DTMF Detect event).
<?xml version="1.0" encoding="UTF-8" ?>
<msml version="1.0">
<dialogstart target="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2"
type="application/moml+xml">
<play>
<media>
<video uri="file://./av/clip2.vid" format="video/raw:codecs=h263" />
<audio uri="file://./av/clip2.pcm" format="audio/pcm:codecs=mulaw"
audiosamplesize="8" audiosamplerate="8" />
</media>
</play>
</dialogstart>
</msml>

Step 4f
The MS sends a 200 OK response to the AS to acknowledge the starting of the Video Clip.
The 200 OK response includes the following MSML/MOML control syntax:

20 MSML/MOML Media Server Software User’s Guide

 Sample Use Case

<msml version="1.0">
<result response="200"/>
<dialogid>conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:28</dialogid>
</msml>

Step 4g
The MS sends the AS an INFO message with the following MSML/MOML control syntax to
indicate that the Video Clip dialog is exiting (a response to the DTMF Detect event).
<msml version="1.0">
<event name="msml.dialog.exit"
id="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:28"/>
</msml>

Step 4h
The AS sends a 200 OK response to the MS to acknowledge Video Clip dialog exit. The 200
OK response does not contain any MSML/MOML control syntax.
Step 4i
The AS sends the MS an INFO message to play the Main Prompt dialog. The INFO message
includes the following MSML/MOML control syntax:
<?xml version="1.0" encoding="UTF-8" ?><msml version="1.0"><dialogstart
target="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2" type="application/moml+xml">
<group topology="parallel" >
<play>
<media>
<video uri="file://./av/main_menu.vid" format="video/raw:codecs=h263" />
<audio uri="file://./av/main_menu.pcm" format="audio/pcm:codecs=mulaw"
audiosamplesize="8" audiosamplerate="8"/>
</media>
</play>
<collect iterate="forever" cleardb="true">
<detect>
<send target="source" event="done" namelist="dtmf.digits" />
<send target="group" event="terminate"/>
</detect>
</collect>
</group>
</dialogstart>
</msml>

Step 4j
The MS sends a 200 OK response to indicate success. The 200 OK response includes the
following MSML/MOML control syntax:
<msml version="1.0">
<result response="200"/>
<dialogid>conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:8</dialogid>
</msml>

MSML/MOML Media Server Software User’s Guide 21

Sample Use Case

3.2.5 Record Message

Step 5a
At this point, the SIP client makes a selection that is transmitted as DTMF to the MS. The
selection is to Record Message. The MS sends the AS an INFO message that includes the
following MSML/MOML control syntax describing the DTMF Detect event.
<msml version="1.0">
<event name="done"
id="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:8">
<name>dtmf.digits</name><value>2</value>
</event>
</msml>

Step 5b
The AS sends a 200 OK response to the MS to acknowledge successful receipt of the DTMF
Detect event. The 200 OK response does not includes any MSML/MOML control syntax.
Step 5c
The MS sends the AS an INFO message with the following MSML/MOML control syntax to
indicate that the Main Prompt dialog is exiting (a response to the DTMF Detect event):
<msml version="1.0">
<event name="msml.dialog.exit"
id="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:8"/>
</msml>

Step 5d
The AS sends a 200 OK response to the MS to acknowledge Main Prompt dialog exit. The
200 OK response does not contain any MSML/MOML control syntax.
Step 5e
The AS sends the MS an INFO message that includes the following MSML/MOML control
syntax to start the Record Message dialog (a response to the DTMF Detect event).
<?xml version="1.0" encoding="UTF-8"?>
<msml version="1.0">
<dialogstart target="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2"
type="application/moml+xml">
<group topology="parallel">
<record beep="true" audiodest="file://./mytest.pcm"
videodest="file://./mytest.vid" format="video/raw;codecs=mulaw,h263"
audiosamplerate="8" audiosamplesize="8">
<recordexit>
<send target="play" event="resume"/>
</recordexit>
</record>
<play initial="suspend">
<media>
<audio uri="file://./mytest.pcm" format="audio/pcm;codecs=mulaw"
audiosamplerate="8" audiosamplesize="8" />
<video uri="file://./mytest.vid" format="video/vid;codecs=h263"/>
</media>
<playexit>
<send target="dtmf" event="terminate"/>
<send target="record" event="terminate"/>
</playexit>
</play>
<dtmf iterate="forever">
<detect>

22 MSML/MOML Media Server Software User’s Guide

 Sample Use Case

<send target="record" event="terminate"/>

</detect>
</dtmf>
</group>
</dialogstart>
</msml>

Step 5f
The MS sends a 200 OK response to the AS to acknowledge the starting of the Record
Message dialog. The 200 OK response includes the following MSML/MOML control syntax:
<msml version="1.0">
<result response="200"/>
<dialogid>conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:30</dialogid>
</msml>

3.2.6 Replay Main Prompt

Step 6a
At this point, when the SIP client sends any DTMF to the MS, the recording operation stops
and playback begins automatically (as determined by the MSML/MOML control syntax in
Step 5e). The MS also sends the AS an INFO message that includes the following
MSML/MOML control syntax indicating a Record Message dialog exit event.
<msml version="1.0">
<event name="msml.dialog.exit"
id="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:30"/>
</msml>

Step 6b
The AS sends a 200 OK response to the MS to acknowledge successful receipt of the event.
The 200 OK response does not includes any MSML/MOML control syntax.
Step 6c
When the playback of the recorded message is complete, the AS sends the MS an INFO
message to play the Main Prompt dialog. The INFO message includes the following
MSML/MOML control syntax:
<?xml version="1.0" encoding="UTF-8" ?><msml version="1.0">
<dialogstart target="conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2"
type="application/moml+xml">
<group topology="parallel" >
<play>
<media>
<video uri="file://./av/main_menu.vid" format="video/raw:codecs=h263" />
<audio uri="file://./av/main_menu.pcm" format="audio/pcm:codecs=mulaw"
audiosamplesize="8" audiosamplerate="8"/>
</media>
</play>
<collect iterate="forever" cleardb="true">
<detect>
<send target="source" event="done" namelist="dtmf.digits" />
<send target="group" event="terminate"/>
</detect>

MSML/MOML Media Server Software User’s Guide 23

Sample Use Case

</collect>
</group>
</dialogstart>
</msml>

Step 6d
The MS sends a 200 OK response to indicate success. The 200 OK response includes the
following MSML/MOML control syntax:
<msml version="1.0">
<result response="200"/>
<dialogid>conn:b19d82a0-0-13c4-13cbd2-58c3964e-13cbd2/dialog:29</dialogid>
</msml>

3.2.7 Terminate Connections

Step 7a to 7d
These steps comprise standard SIP message exchanges for the termination of the SIP dialogs
between the SIP client and the AS and between the AS and MS and the termination of the
media session (RTP) between the SIP client and the MS.

24 MSML/MOML Media Server Software User’s Guide

Feature Support
4. 4
This chapter describes the features supported by the current version of the MSML/MOML media
server software. Topics include:
• MSML Feature Support Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
• MOML Feature Support Matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.1 MSML Feature Support Matrix

Table 1 describes the current level of support for MSML elements and attributes. Supported items
are shown in black text; unsupported items are shown in red text. The “Comment” column
indicates restrictions or limitations that the current version of the MSML/MOML media server
software imposes.
Note: The level of support is correlated against MSML IETF Draft, Version -06.

Table 1. MSML Feature Support Matrix

Element Name Attribute Name Level of Support Comments

<msml> - supported

version supported Must be “1.0”

<send> - supported

event supported

target supported
valuelist supported

mark supported

<result> - supported

response supported

mark supported

<event> - supported

name supported

id supported

<join> - supported

id1 supported

id2 supported

mark supported

MSML/MOML Media Server Software User’s Guide 25

Feature Support

Table 1. MSML Feature Support Matrix (Continued)

Element Name Attribute Name Level of Support Comments

<modifystream> - supported

id1 supported

id2 supported

mark supported

<unjoin> - supported

id1 supported
id2 supported

mark supported

<stream> - supported

media supported Supports “audio” only,

which is the default

dir supported
compressed not supported

preferred not supported

display not supported

<gain> - supported

amt supported

agc supported

tgtlvl not supported

maxgain not supported

<clamp> - not supported

dtmf not supported

tone not supported

<visual> - not supported

<monitor> - not supported

id1 not supported

id2 not supported

compressed not supported

mark not supported

<createconference> - not supported

name not supported

deletewhen not supported

term not supported

mark not supported

26 MSML/MOML Media Server Software User’s Guide

 Feature Support

Table 1. MSML Feature Support Matrix (Continued)

Element Name Attribute Name Level of Support Comments

<modifyconference> - not supported

id not supported

mark not supported

<destroyconference> - not supported

Id not supported

mark not supported

<audiomix> - not supported

id not supported

<n-loudest> - not supported

n not supported

<asn> - not supported

n not supported

<videolayout> - not supported

type not supported

id not supported

<root> - not supported

size not supported

backgroundcolor not supported

backgroundimage not supported

<region> - not supported

id not supported

left not supported

top not supported

relativesize not supported

priority not supported

title not supported

titletextcolor not supported

titlebackgroundcolor not supported

bordercolor not supported

borderwidth not supported

logo not supported

freeze not supported

blank not supported

MSML/MOML Media Server Software User’s Guide 27

Feature Support

Table 1. MSML Feature Support Matrix (Continued)

Element Name Attribute Name Level of Support Comments

<selector> - not supported

id not supported

method not supported

status not supported

blankothers not supported

si not supported

speakersees not supported

<reserve> - not supported

required not supported

<resource - not supported

n not supported

<dialogstart> - supported

target supported
src supported Supports the “file://”
schema only

type supported
name supported

mark supported

<dialogend> - supported
id supported

mark supported

28 MSML/MOML Media Server Software User’s Guide

 Feature Support

4.2 MOML Feature Support Matrix

Table 2 describes the current level of support for MOML elements, attributes, events and shadow
variables. Supported items are shown in black text; unsupported items are shown in red text. The
“Comment” column indicates restrictions or limitations that the current version of the
MSML/MOML media server software imposes.
Note: The level of support is correlated against MOML IETF Draft, Version -06.

Table 2. MOML Feature Support Matrix

Shadow Variable Level of

Element Name Attribute Name Event Name Comment
Name Support
<moml> supported

version supported Must be “1.0”

id supported
terminate supported

<send> supported

event supported

target supported

namelist supported

<exit> not supported

namelist not supported

<disconnect> not supported

namelist not supported

<event> supported

name supported

id supported

<group> supported
topology supported Supports “parallel” topology
only

id supported
terminate supported

<groupexit> supported

MSML/MOML Media Server Software User’s Guide 29

Feature Support

Table 2. MOML Feature Support Matrix (Continued)

Shadow Variable Level of

Element Name Attribute Name Event Name Comment
Name Support
<play> supported

id supported

interval supported

iterate supported

initial supported

maxtime supported

barge supported No effect for video

cleardb supported Supports “true” only

No effect for video
offset supported No effect for video

skip not supported

xml:lang not supported

pause not supported

resume supported

forward not supported

backward not supported

restart supported

toggle-state not supported

terminate supported
play.amt supported No support for video

play.end supported

30 MSML/MOML Media Server Software User’s Guide

 Feature Support

Table 2. MOML Feature Support Matrix (Continued)

Shadow Variable Level of

Element Name Attribute Name Event Name Comment
Name Support
<audio>

uri supported Supports the “file://”

schema only

format supported Supports “audio/wav” and

“audio/vox;codecs=value”
only
Codecs are ignored for wav
format
Codecs are required for vox
format; valid codecs are:
“mulaw”, “alaw”, “pcm”,
“dialogic_adpcm”, “g726”

audiosamplerate supported Ignored for wav format

Required for vox format;
valid values are: 6, 8, 11

audiosamplesize supported Ignored for wav format

Required for vox format;
valid values are: 2, 4, 8

iterate supported

xml:lang not supported

<video> supported

uri supported Supports the “file://”

schema only

format supported Supports

“video/vid;codecs=h263”
only

audiosamplerate not supported

audiosamplesize not supported

codecconfig not supported

profile supported No values defined

level supported No values defined

imagewidth supported No values defined

imageheight supported No values defined

maxbitrate supported No values defined

framerate supported No values defined

iterate supported

<media> supported

MSML/MOML Media Server Software User’s Guide 31

Feature Support

Table 2. MOML Feature Support Matrix (Continued)

Shadow Variable Level of

Element Name Attribute Name Event Name Comment
Name Support
<var> not supported

type not supported

subtype not supported

value not supported

xml:lang not supported

<playexit> supported

<dtmfgen> supported

id supported
digits supported

level supported

dur supported

interval supported
terminate supported

dtmfgen.end supported

<dtmfgenexit> supported

32 MSML/MOML Media Server Software User’s Guide

 Feature Support

Table 2. MOML Feature Support Matrix (Continued)

Shadow Variable Level of

Element Name Attribute Name Event Name Comment
Name Support
<record> supported

id supported

append not supported

dest supported Uses dx_ device; supports

the “file://” schema only
audiodest supported Uses mm_ device; supports
the “file://” schema only

videodest supported Uses mm_ device; supports

the “file://” schema only

format supported

codeconfig not supported

audiosamplerate supported Valid values are: 6, 8, 11

audiosamplesize supported Valid values are: 2, 4, 8

profile supported No values defined

level supported No values defined

imagewidth supported No values defined

imageheight supported No values defined

maxbitrate supported No values defined

framerate supported No values defined

initial supported

maxtime supported
prespeech not supported

postspeech not supported

termkey supported No effect for video

beep supported Proprietary implementation

pause not supported

resume supported

toggle-state not supported

terminate supported

terminate.cancelled not supported

terminate.finalsilence not supported

nospeech not supported

record.len supported No support for video

record.end supported

<recordexit> supported

MSML/MOML Media Server Software User’s Guide 33

Feature Support

Table 2. MOML Feature Support Matrix (Continued)

Shadow Variable Level of

Element Name Attribute Name Event Name Comment
Name Support
<dtmf>, supported
<collect>
id supported

cleardb supported Supports “true” only

fdt supported

idt supported

starttimer supported

iterate supported

starttimer supported
terminate supported

dtmf.digits supported

dtmf.len supported

dtmf.last supported
dtmf.end supported

<pattern> - supported

digits supported

format supported Supports the “moml+digits”

format only; the “mgcp” and
“megaco” formats are not
supported

iterate supported

<detect> supported
<noinput> supported

iterate supported

<nomatch> supported
iterate supported

<dtmfexit> supported

<vad> not supported

starttimer not supported

starttimer not supported

terminate not supported

<voice>, not supported

<silence>
len not supported

<tvoice>, not supported

<tsilence>
sen not supported

34 MSML/MOML Media Server Software User’s Guide

 Feature Support

Table 2. MOML Feature Support Matrix (Continued)

Shadow Variable Level of

Element Name Attribute Name Event Name Comment
Name Support
<gain> supported

incr supported

amt supported Valid values are in the

range: -10 to +10

mute not supported

unmute not supported

reset supported

louder supported

softer supported

amt supported

<agc> not supported

tgtlvl not supported

maxgain not supported

mute not supported

unmute not supported

<gate> not supported

initial not supported

mute not supported

unmute not supported

<clamp> not supported

<relay> not supported

<speech> not supported

noint not supported

norect not supported

spcmplt not supported

spincmplt not supported

confidence not supported

sens not supported

starttimer not supported

iterate not supported

sens not supported

starttimer not supported

terminate not supported

speech.end not supported

speech.results not supported

MSML/MOML Media Server Software User’s Guide 35

Feature Support

Table 2. MOML Feature Support Matrix (Continued)

Shadow Variable Level of

Element Name Attribute Name Event Name Comment
Name Support
<grammar> not supported

uri not supported

iterate not supported

<match> not supported

<noinput> not supported

iterate not supported

<nomatch> not supported

iterate not supported

<speechexit> not supported

<tts> not supported

uri not supported

iterate not supported

xml:lang not supported

<faxdetect> not supported

36 MSML/MOML Media Server Software User’s Guide

 Feature Support

Table 2. MOML Feature Support Matrix (Continued)

Shadow Variable Level of

Element Name Attribute Name Event Name Comment
Name Support
<faxsend> not supported

lclid not supported

minspeed not supported

maxspeed not supported

ecm not supported

terminate not supported

fax.rmtid not supported

fax.rate not supported

fax.resolution not supported

fax.pagesize not supported

fax.encoding not supported

fax.ecm not supported

fax.pagebadlines not supported

fax.objbadlines not supported

fax.opbadlines not supported

fax.objuri not supported

fax.resendcount not supported

fax.totalpages not supported

fax.totalobjects not supported

fax.duration not supported

fax.result not supported

<sendobj> not supported

objuri not supported

startpage not supported

pagecount not supported

<hdrfooter> not supported

type not supported

style not supported

<format> not supported

<rxpoll> not supported

rmtid not supported

<faxstart> not supported

<faxnegotiate> not supported

<faxpagedone> not supported

MSML/MOML Media Server Software User’s Guide 37

Feature Support

Table 2. MOML Feature Support Matrix (Continued)

Shadow Variable Level of

Element Name Attribute Name Event Name Comment
Name Support
<faxobjectdone> not supported

<faxopcomplete> not supported

<faxpollstarted> not supported

<faxrcv> not supported

lclid not supported

ecm not supported

terminate not supported

fax.rmtid not supported

fax.rate not supported

fax. resolution not supported

fax. pagesize not supported

fax.encoding not supported

fax.ecm not supported

fax.pagebadlines not supported

fax.objbadlines not supported

fax. opbadlines not supported

fax.objuri not supported

fax.resendcount not supported

fax.totalpages not supported

fax.totalobjects not supported

fax.duration not supported

fax.result not supported

<rcvobj> not supported

objuri not supported

maxpages not supported

<txpoll> not supported

38 MSML/MOML Media Server Software User’s Guide

Deviations from IETF Drafts
5. 5
The version of the MSML/MOML media server software described in this manual is based on:
• Media Sessions Markup Language, IETF Draft, Version -06
• Media Objects Markup Language, IETF Draft, Version -06

The following is a list of the deviations from the IETF drafts:

• Nested groups are not supported.
• Only the “parallel” topology for <group> elements is supported.
• The MOML draft calls for the <play> element to be a child of a <record> or <dtmf> element.
This is not supported.
• Currently, only the “file://” scheme is supported in MOML control syntax and recordings.
• Wildcard IDs for the <join>, <modifystream> and <unjoin> elements are not supported.
• The <video> element is not supported as a direct child of the <play> element. The <audio>
and <video> elements must be child elements of the <media> element to play an audio-visual
recording.
• The barge, cleardb, and offset attributes of the <play> element have no effect when playing a
video.
• The play.amt shadow variable of the <play> element has no effect for video.
• The record.len shadow variable of the <record> element has no effect for video.
• When recording an audio item, the dest attribute must be used.
• When recording an audio-visual item, the audiodest and videodest attributes must be used.
• Audio-visual recordings are currently recorded into two separate files.
• Audio-visual playback is supported via two separate files and must be defined in an <audio>
and <video> element.
• The format attribute of the <pattern> element supports the “moml+digits” format only. The
“mgcp” and “megaco” formats are not supported.

MSML/MOML Media Server Software User’s Guide 39

Deviations from IETF Drafts

40 MSML/MOML Media Server Software User’s Guide

Diagnostics
6. 6
This chapter provides an overview of the diagnostic capabilities available in the MSML/MOML
media server software. Topics include:
• Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
• Logging Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
• Log File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

6.1 Overview
The media server is integrated with the RTF logging services used by other host libraries. The RTF
XML configuration file, located in the /cfg directory, is used to set the logging level that defines
what content is written to the RTF log file. The media server logging capabilities are described in
the subsections following.

6.2 Logging Configuration

Different media server client objects can be assigned different logging levels. The following topics
provide more detail:
• Configuration File Format
• Logging Labels
• Client Categories

6.2.1 Configuration File Format

The media server section of the RTF configuration file is given below. Detailed information about
the logging labels and the clients that can be configured for logging are given in the sections
following.
<!-- IP Media Server-->
<Module name="media_svr" state = "1">
<MLabel name="WARN" state = "0"/>
<MLabel name="INFO" state = "0"/>
<MLabel name="FUNC" state = "0"/>

<!-- Media Server objects-->

<MClient name="RESOURCE" state = "0"/>
<MClient name="SIP_BOARD_RES" state = "0"/>
<MClient name="SIP_RES" state = "0"/>
<MClient name="IPM_RES" state = "0"/>
<MClient name="DX_RES" state = "0"/>
<MClient name="MM_RES" state = "0"/>
<MClient name="CNF_RES" state = "0"/>
<MClient name="CNF_PARTY_RES" state = "0"/>

MSML/MOML Media Server Software User’s Guide 41

Diagnostics

<MClient name="CNF_BOARD_RES" state = "0"/>

<MClient name="FX_RES" state = "0"/>
<MClient name="DT_RES" state = "0"/>
<MClient name="MSML" state = "0"/>
<MClient name="MOML" state = "0"/>
<MClient name="NETWORK_CONN" state = "0"/>
<MClient name="TDM_STREAM" state = "0"/>
<MClient name="DEV_STREAM" state = "0"/>
<MClient name="TRANSACTION" state = "0"/>
<MClient name="MSML_TRANSACTION" state = "0"/>
<MClient name="MOML_TRANSACTION" state = "0"/>
<MClient name="XML_PARSER" state = "0"/>
<MClient name="HTTP" state = "0"/>
<MClient name="SOCKET" state = "0"/>
<MClient name="EVENT_MGR" state = "0"/>
<MClient name="TRANSACTION_MGR" state = "0"/>
<MClient name="NETWORK_CONN_MGR" state = "0"/>
<MClient name="SESSION_MGR" state = "0"/>
<MClient name="MEDIA_STREAM_MGR" state = "0"/>
<MClient name="RESOURCE_MGR" state = "0"/>
<MClient name="THREAD_MGR" state = "0"/>
<MClient name="CNF_MGR" state = "0"/>
<MClient name="THREAD" state = "0"/>
<MClient name="TIMER" state = "0"/>
</Module>

6.2.2 Logging Labels

To enable media server logging in the RTF configuration file:
<Module name="media_svr" state = "1">

To disable all media server logging:

<Module name="media_svr" state = "0">

Note: Special startup/shutdown configuration information is always logged.

The logging labels that can be specified for the various media server client objects are as follows:
ERROR - Default
Log unexpected conditions or events that cause a related action to fail. This is a global label
which is set in the beginning of the RTF XML file.
WARN
Log unexpected conditions or events that should not cause a related action to fail.
INFO
Log additional information such as state changes, events, and function parameters.
FUNC
Logs function entry and exit.
Note: Logging labels are independent of each other. For example, enabling FUNC and disabling INFO
logs function entry and exit, but not additional information.

42 MSML/MOML Media Server Software User’s Guide

 Diagnostics

6.2.3 Client Categories

The various clients that can be enabled are listed below. Each client can be set to 0 (disable) or
1 (enable). If enabled, the logging labels determine the detail of the log content. The clients can be
categorized as follows:
SIP Call Control
Provides the call control implementation that allows call establishment with application
servers:
• SIP_BOARD_RES – ipt virtual board abstraction
• SIP_RES – ipt channel
• NETWORK_CONN – network connection object that uses a SIP resource and
conditionally an ipm resource to establish a call; also responsible for processing SDP
information
• NETWORK_CONN_MGR – manager that creates, initializes and destroys network
connections
Resources
Abstractions of the media resources provided by Intel:
• RESOURCE – base object from which all other resources are derived
• IPM_RES – ipm resource
• DX_RES – dxx resource
• MM_RES – mm resource
• CNF_RES – cnf resource; currently not supported
• CNF_BOARD_RES – cnf virtual board resource, currently not supported
• CNF_MNR – cnf manager, responsible for mapping conference names to resources and
providing bridge support; currently not supported
• FX_RES – fax object; currently not supported
• RESOURCE_MGR – creates, allocates, deallocates and destroys all resources
MSML MOML
Objects responsible for processing MSML/MOML specific requests:
• MSML – MSML object
• MOML – MOML object
Connections
Objects responsible for creating, modifying, and destroying resource connections including
gain and AGC:
• TDM_MEDIA_STREAM – implements TDM listen/unlisten functionality
• DEV_MEDIA_STREAM – implements dev_Connect/dev_Disconnect functionality
• MEDIA_STREAM_MGR – manages DEV and TDM streams
Transactions
Requests sent to the media server to perform media operations:
• TRANSACTION – base object from which all other transactions are derived
• MSML_TRANSACTION – MSML/MOML transactions
• MOML_TRANSACTION – not currently used
• TRANSACTION_MGR – allocates and deallocates transactions
Utilities
Objects that provide internal services required by clients:
• TIMER – provides timer callback trigger
• THREAD – provides a separate thread context to execute some action

MSML/MOML Media Server Software User’s Guide 43

Diagnostics

• THREAD_MGR – allocates/deallocates threads

• HTTP – read from or write to remote files; currently not supported
• SOCKET – read from or write to TCP/IP socket; currently not supported
XML Parsing
Objects for XML parsing:
• XML_PARSER – XML parser
Miscellaneous
Other objects:
• EVENT_MGR – Standard Runtime Library (SRL) event manager; dispatches SRL events
to registered clients
• SESSION_MGR – creates and destroys all other managers

6.3 Log File Format

The following is a snippet from a sample log file.
. . .

06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSML ! 1 ! ====> CMSML::ValidateScript()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSML ! 1 ! CMSML::ValidateScript - Dumping
script body
<?xml version="1.0" encoding="UTF-8" ?>
<msml version="1.0">
<join id1="conn:51f0188-0-13d8-64325-7d02fa29-64325" id2="conn:51f0698-0-13d8-
64334-29ea58e0-64334" />
</msml>
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSML ! 1 ! <==== CMSML::ValidateScript()
returns 0
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSML ! 1 ! CMSML::EvProcessScript - Validation
successful. Processing initiated
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSML ! 1 ! CMSML::EvProcessScript - Mandatory
attribute version = 1.0
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSML ! 1 ! ====> CMSML::ProcessElement()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSML ! 1 ! CMSML::ProcessElement - Processing
new MSML element. Element = join
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSML ! 1 ! ====> CMSML::ProcessEvent(), event =
1
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSML ! 1 ! CMSML::ProcessEvent - Processing
Event EV_Join in State MSML_Processing
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSML ! 1 ! ====> CMSML::SetState()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSML ! 1 ! CMSML::SetState - Transitioning from
MSML_Processing to MSML_Connecting
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSML ! 1 ! <==== CMSML::SetState()
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSML ! 1 ! ====> CMSML::EvJoin()
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! ====> CMSMLJoin::Parse()
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! ====> CMSMLJoin::Reset()
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! <==== CMSMLJoin::Reset() returns 0
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSMLJoin ! 1 ! CMSMLJoin::Parse - Processing MSML
element <join>
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! ====>
CMxMLElement::LoadMandatoryAttribute()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSMLJoin ! 1 ! CMxMLElement::LoadMandatoryAttribute
- Mandatory attribute id1 = conn:51f0188-0-13d8-64325-7d02fa29-64325
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! <====
CMxMLElement::LoadMandatoryAttribute()
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! ====>
CMxMLElement::LoadMandatoryAttribute()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSMLJoin ! 1 ! CMxMLElement::LoadMandatoryAttribute
- Mandatory attribute id2 = conn:51f0698-0-13d8-64334-29ea58e0-64334
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! <====
CMxMLElement::LoadMandatoryAttribute()
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! ====>
CMxMLElement::LoadOptionalAttribute()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSMLJoin ! 1 ! CMxMLElement::LoadOptionalAttribute
- Optional attribute mark = null
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! <====
CMxMLElement::LoadOptionalAttribute()
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! <==== CMSMLJoin::Parse() returns 0
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! ====> CMSMLJoin::Execute()
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MSML ! MSMLJoin ! 1 ! ====> CMSMLJoin::CreateStreams()

44 MSML/MOML Media Server Software User’s Guide

 Diagnostics

06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MSML ! MSMLJoin ! 1 ! CMSMLJoin::CreateStreams -

Initiating connection between conn:51f0188-0-13d8-64325-7d02fa29-64325 and conn:51f0698-0-13d8-64334-29ea58e0-64334 via MediaStreamMgr
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! ===> CreateStream()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! Create 2 streams,
IClientNotify=0x5356284
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! ===> SortStreams()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! Sort 2 SMediaStreams
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! <=== SortStreams(): return E_SUCCESS
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! ===> AreStreamsActive()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! Check if 2 TDM streams and 0 DEV
streams are active
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! <=== AreStreamsActive(): returns
false
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! ===> AllocateCxTransaction()
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! <==== AllocateCxTransaction()
returns 0
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! ===> AllocateCTDMStream()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! AllocateCTDMStream() return
CMediaStream with Id = 20
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! <==== AllocateCTDMStream() returns 0
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! Create TDM Stream, TxResource =
ipmB1C49, RxResource = ipmB1C47
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! ===> AllocateCTDMStream()
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! AllocateCTDMStream() return
CMediaStream with Id = 19
06/19/2006 09:12:23.035 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! <==== AllocateCTDMStream() returns 0
06/19/2006 09:12:23.035 1300 740 media_svr INFO ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! Create TDM Stream, TxResource =
ipmB1C47, RxResource = ipmB1C49
06/19/2006 09:12:23.115 1300 2260 media_svr FUNC ! NETWORK_CONN ! CNetworkConnection ! 3 ! ====> Notify()
06/19/2006 09:12:23.115 1300 2260 media_svr INFO ! NETWORK_CONN ! CNetworkConnection ! 3 ! Notify - IPMEV_LISTEN Event -
Device = ipmB1C47
06/19/2006 09:12:23.115 1300 2260 media_svr FUNC ! NETWORK_CONN ! CNetworkConnection ! 3 ! <==== Notify() returns 8.
06/19/2006 09:12:23.115 1300 2260 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! ====> Notify()
06/19/2006 09:12:23.115 1300 740 media_svr FUNC ! MEDIA_STREAM_MGR ! CMediaStreamMgr ! 1 ! <=== CreateStream(): returns
E_SUCCESS
. . .

MSML/MOML Media Server Software User’s Guide 45

Diagnostics

46 MSML/MOML Media Server Software User’s Guide

MSML Overview A
This chapter provides a brief overview of MSML. The descriptions provide here are based on
Media Sessions Markup Language (MSML), Internet IETF Draft, Version -06, which was current
during the development of the version of MSML/MOML media server software software described
in this manual. Topics include:
• Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
• MSML Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
• Stream Manipulation Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
• Conference Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
• Dialog Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
• Receiving Events from a Client . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
• Sending Events and Transaction Results to a Client . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
• Media Server Object Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

A.1 Introduction
The Media Sessions Markup Language (MSML) is used to control and invoke many different types
of services on IP media servers. Clients can use MSML to define how multimedia sessions interact
on a media server and to apply services to individual users or groups of users. MSML can be used
to control media server conferencing features such as video layout and audio mixing, create sidebar
conferences or personal mixes, and set the properties of media streams. In addition, clients can use
MSML with other languages such as the Media Objects Markup Language (MOML) to interact
with individual users or groups of conference participants.
Note: The current implementation of the MSML/MOML Media Control Interface software does not
support all the capabilities of MSML.

A.2 MSML Elements

MSML commands are sent from a client to the media server via SIP messages (most notably the
INFO message). The body of the SIP message contains the XML control syntax.

A.2.1 <msml>
The root XML element of MSML is <msml>. It defines the set of operations that form a single
MSML transaction.

Results or events returned to the client are also enclosed in the <msml> element.

MSML/MOML Media Server Software User’s Guide 47

A.2.2 <send>
The <send> element is used by a client to send an event to the media server.

A.2.3 <result>
The <result> element is used by the media server to report the results of an MSML transaction
requested by a client.

A.2.4 <event>
The <event> element is used by the media server to notify a client of an event.

A.3 Stream Manipulation Elements

The following subsections describe the elements that establish, modify, and remove streams.
Note: The <monitor> element described in MSML IETF draft, version -06 is not currently supported.

A.3.1 <join>
The <join> element is used to create one or more streams between two independent objects.
Streams may be audio or video and may be unidirectional or bidirectional.

A.3.2 <modifystream>
The <modifystream> element is used to change the properties of a stream. The <modifystream>
element can have different properties such as the gain for an audio stream or a visual label for a
video stream.

A.3.3 <unjoin>
The <unjoin> element is used to remove one or more existing media streams between two objects.

A.4 Conference Elements

Note: The <createconference>, <modifyconference>, <destroyconference> elements described in
MSML IETF draft, version -06, are not currently supported.

A.5 Dialog Elements

Dialogs are used for interaction with a user.

48 MSML/MOML Media Server Software User’s Guide

A.5.1 <dialogstart >
The <dialogstart> element is used to instantiate a media dialog on connections or conferences.

A.5.2 <dialogend >

The <dialogend> element is used to terminate a dialog created through <dialogstart>.

A.6 Receiving Events from a Client

Events are received from clients via SIP INFO messages. Events are used to affect the behavior of
different objects within the media server. The client includes the <send> element within the
<msml> root element. The <send> element identifies the event to process.

A.7 Sending Events and Transaction Results to a Client

A.7.1 Transaction Results

The <result> element is used to report the results of an MSML transaction. The <result> element
is included in the final response to the SIP INFO message that initiated the transaction.

A.7.2 Events
The <event> element is used to notify the media server client of an event. Events are sent to clients
via SIP INFO messages.

A.8 Media Server Object Model

Media server objects represent entities that source, sink, or modify media streams. A media stream
is a unidirectional or bidirectional media flow between objects in a media server.

The media server object classes are:

• Network Connections (conn)
• Conference (conf) - not currently supported
• Dialog (dialog)
• Operator (oper)

MSML/MOML Media Server Software User’s Guide 49

A.8.1 Network Connections (conn)

Definition
A Network Connection is an object or class defined in the MSML specification. Network
Connection is an abstraction for the media processing resources involved in terminating the RTP
session(s) of a call. For audio services, a connection instance presents a full-duplex audio stream
interface within a media server. Multimedia connection objects have multiple media streams of
different media types, each corresponding to an RTP session. MSML Network Connection
instances are instantiated through SIP.

Object Creation
Unlike other MSML objects that are created using MSML commands/elements, Network
Connection objects are not created using MSML commands/elements. Network Connections are
created when media sessions get established through SIP call control. The connection identifier is
not assigned by the Application Server (AS). It is assigned by the media server and is returned to
the AS in the response to the initial INVITE received from the AS. Specifically, this is the “tag”
value included in the “To” header in the response. The format of the connection identifier is
“conn:<tag value>”.

Figure 3 shows the interactions between the MS and the AS to create a Network Connection and
establish an object identifier.

50 MSML/MOML Media Server Software User’s Guide

 Figure 3. Network Connection Creation

Application Server Media Server

SIP Agent
(AS) (MS)

The inbound INVITE from

INVITE the SIP agent contains an SDP
describing the capabilities
of the SIP agent.
The INVITE from the AS
contains the original INVITE
SDP received from the
SIP agent.

The 200 OK from the MS

contains an SDP describing
the capabilities of the MS. 200 OK (To:tag=74jgd63956ts)

The 200 OK also contains a To

header with a "tag" value. This
"tag" value is used as the object
identifier by both the AS and MS.

200 OK The 200 OK from the AS

contains the SDP received
from the MS.

Since the MS has the capabilities of the SIP agent

and the SIP agent has the capabilities of the MS,
full-duplex media flow can be established.

Multiple RTP streams may exist.

RTP

Note: In Figure 3, the identifier used by the MS and AS to reference the network connection is
“conn:74jgd63956ts”.

A.8.2 Conference (conf)

Note: The Conference (conf) class is not currently supported.

A.8.3 Dialog (dialog)

Definition
Dialogs are a class of objects that represent automated participants. Dialogs are similar to network
connections from a media flow perspective and may have one or more media streams as the
abstraction for their interface within the MS. Unlike network connections, dialogs are created and
destroyed through MSML. The MS implements the dialog participant.

MSML/MOML Media Server Software User’s Guide 51

 A Dialog is a generic reference to the set of resources, both media and control, that are used to
create a simple or complex action. An atomic play or record is an example of a simple action.

The function that a Dialog instance fulfills is defined by a client and the language utilized. In this
case, it is MOML.

MSML Dialog instances are instantiated through the <dialogstart> element.

Object Creation
All MSML objects except the Network Connection objects are created using MSML
commands/elements.

The following example starts a MOML dialog on a connection.

<?xml version="1.0" encoding="UTF-8"?>
<msml version="1.0">
<dialogstart target="conn:abcd1234"
type="application/moml+xml"
name="sample"
src="http://server.example.com/scripts/foo.moml"/>
</msml>

A.8.4 Operator (oper)

Definition
An Operator is an object or class used to filter or transform a media stream. Operators have a media
type and may be unidirectional or bidirectional.

Unidirectional operators reflect simple atomic functions, such as automatic gain control or filtering
tones. Unidirectional operators have a single media input that is connected to the media stream
from one object, and a single media output that is connected to the media stream of a different
object.

Bidirectional operators have two media inputs and two media outputs. One media input and output
is associated with the stream to one object, and the other input and output is associated with a
stream to a different object.

The function that an Operator instance fulfills is defined by a client and the language utilized. In
this case, it is MOML.

MSML Operator instances are instantiated when streams are created using a <join> element or
modified using a <modifystream> element.

Object Creation
All MSML objects except Network Connection objects are created using MSML
commands/elements.

52 MSML/MOML Media Server Software User’s Guide

MOML Overview B
This chapter provides a brief overview of MOML. The descriptions provide here are based on
Media Objects Markup Language (MSML), Internet IETF Draft, Version -06, which was current
during the development of the version of MSML/MOML media server software software described
in this manual. Topics include:
• Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
• Primitives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
• Reference to Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

B.1 Introduction
The Media Objects Markup Language (MOML) is a modular and extensible language to define
media processing objects that execute on media servers. The base language defines a set of
primitive media objects and provides tools to group primitives together and specify how they
interact with each other. Clients use the base MOML, or extend MOML, to create precisely tailored
media processing objects that may be used as parts of application interactions with users or
conferences or to transform media flowing internal to a media server. Interactive Voice Response
(IVR) is an example of an application interaction with a user.

B.2 Primitives
MOML primitives perform a single function on a media stream such as audio generation, speech
recognition, DTMF detection or gain adjustment.

MOML primitives can be divided into three main categories:

• Recognizers
• Transformers
• Sources and Sinks

B.2.1 Recognizers
Recognizers have a media input, but no output. They allow different things within a media stream
to be recognized or detected and enable events to be generated based upon received media.

MSML/MOML Media Server Software User’s Guide 53

 The recognizers defined in the IETF draft include:
• dtmf
DTMF input fulfills several roles. It is used to trigger events that affect media processing. It is
also used to collect DTMF digits from a media stream, which are reported back to the
application server.
• faxdetect
Fax tone detection is used to detect the presence of the T.30 CNG tone in a media stream.
• speech
Speech activates grammars or user input rules associated with speech recognition.
• vad
Voice activity detection (VAD) is used to detect voice and silence when speech recognition is
not required.

B.2.2 Transformers
Transformers have one media input and one media output and may send and receive events.

The recognizers defined in the IETF draft include:

• agc
Automatic Gain Control (AGC), which is the process where the media server automatically
adjusts the gain of a media stream.
• clamp
Used to filter DTMF tones from a media stream.
• gain
Used to adjust the gain of a media stream by a specific amount.
• gate
A simple filter that passes or halts media, regardless of the format of the media stream, based
on the events it receives.
• relay
A simple primitive that copies its input to its output.

B.2.3 Sources and Sinks

Sources generate media; sinks consume media. They have either a media input or a media output,
but not both. They may receive and generate events.

The sources and sinks defined in the IETF draft include:

• play
Used to generate an audio stream.
• record
Creates a recording.

54 MSML/MOML Media Server Software User’s Guide

 • dtmfgen
Originates one or more DTMF digits in sequence.
• faxsend
Provides the functionality of a calling fax terminal.
• faxrcv
Provides the functionality of a called fax terminal.

B.3 Reference to Examples

See Chapter 3, “Sample Use Case” for examples of the MSML/MOML control syntax that can be
used to perform media control operations.

MSML/MOML Media Server Software User’s Guide 55

56 MSML/MOML Media Server Software User’s Guide
Glossary

3PCC: Third-Party Call Control

Application Server: An external server running applications that originate MSML requests to a Media
Server (MS).

IETF: Internet Engineering Task Force

IVR: Interactive Voice Response

IP: Internet Protocol

Media Server: A general-purpose platform for executing real-time media processing tasks. It may be a single
physical device or a logical function within a physical device.

MOML: Media Objects Markup Language

MSML: Media Sessions Markup Language

RTP: Real Time Protocol

SDP: Session Description Protocol

SIP: Session Initiation Protocol

XML: Extensible Markup Language

MSML/MOML Media Server Software User’s Guide 57

58 MSML/MOML Media Server Software User’s Guide