Enhance Your Communication Fax Passthru Method Reinvents Faxing

... fax passthrough using an audio codec is attempted. The Call Agent ... fax transmission method being used. Implementations of this package MUST at ... In an inbound fax call to an analog fax machine, after an RTP session is established a re-invite is sent from CM to SM with M attribute as ... ... FAX tone is detected on the PSTN side, FS receives a T.38 > > re ... pass-through with special > > codec characteristics - > -silence ... * move to audio-pass through fax on asterisk. No T.38. If that works. * add in T.38. You will learn things in that process and be able to ... ... fax is still working, but outbound faxing still is not possible. I put up a flow-chart (by wireshark) and a dump of the relevant re-invite ... * FAX Passthru Method: None from NSE. * FAX Process NSE: no from ... • FAX Passthru Method: ReINVITE. • FAX Disable ECAN: yes. • FAX Tone ... This is the most common issue with faxing, as after the initial invite, the remote side sends a re-invite that contains different information, ... ... faxes (sending was flaky too). After about 3 hours of tinkering Vonage and I discovered that changing the the FAX Passthru Method from ReINVITE ... Inbound T.38 faxes, when the ATA has to do the reinvite, work perfectly fine from one end to the other. Outbound faxes on the other hand, don't work at all. What things should I try to make Freeswitch more amenable to carrying these faxes? The ATAs on the other end are not recieving any T38 re-invite ...