Hi Team,
i have installed gofaxip and freeswitch as per your instructions and started testing it. After some tries and adjustments in the config i could create successfully my first faxes with Hylafax and freeswitch, gofaxip however in almost all the cases the fax keeps the voip connection open forever even if spandsp reports through the event socket that the fax was successfully delivered. I have to shutdown freeswitch to get the fax to hang up and complete. This happens in almost all my test cases. See one log attached:

2017/04/22 23:23:07.052553 Processing HylaFAX Job 440 as e1062558-b04b-4fc9-8a58-5336b6511b2b
2017/04/22 23:23:07.089390 Originating channel to (FAX NUMBER) using gateway default
2017/04/22 23:23:13.932231 Originate successful
2017/04/22 23:23:13.932649 Call state change: EARLY
2017/04/22 23:23:13.933085 Call state change: ACTIVE
2017/04/22 23:23:21.784950 Remote ID: "", Transfer Rate: 14400, ECM=true
2017/04/22 23:23:34.373968 Page 1 sent: Image Size: 1728x1162, Compression: T.6, Comp Size: 1701 bytes, Bad Rows: 0
2017/04/22 23:23:54.439536 Page 2 sent: Image Size: 1728x1162, Compression: T.6, Comp Size: 26519 bytes, Bad Rows: 0

Hangs up only because i shutdown freeswitch manually after waiting another 6 mins to see if fax will hang up automatically.
2017/04/22 23:29:27.862314 Call state change: HANGUP
2017/04/22 23:29:27.865432 Success: true, Hangup Cause: SYSTEM_SHUTDOWN, Result: OK

Regards
Rob