ActFax
ActFax Communication-Software
...The client/server architecture of ActFax stands for a fast and simple integration of fax and email with Windows as well as other operating systems, like Unix (i.e. AIX, HP-UX, Solaris), Linux, DOS or mainframes. The software also offers full support for terminal server and Citrix (XenApp) environments. The connection to the public switched telephone network can be done through analog lines, ISDN, VoIP/FoIP, SIP and T.38, as well as Web Fax Providers. The easy integration of ActFax into own applications is used for fully automated fax transmissions.