This can be closed, I did a little more research and found this ws aknown problem in 1.4.13, I backed up to 1.4.12 and it is ok now. I shall track this before moving ahead again. It only affects certain devices and carriers, we just happen to have on of the carriers that did not deal with correctly. Incidentally the use yate as their tandem. Darcy ----- Original Message ----- From: Darcy Primrose To: FreeSWITCH Users Help Sent: Monday, January 12, 2015 5:59 PM Subject: [Freeswitch-users] fax relay question We use a freeswitch as a relay between our carriers and other freeswitches, it has worked great until we upgraded to the latest freeswitch version recently We we receive a fax, inbound and relay it, the subsequent re invite we get back looks like the frist block below, then when the freeswitch relays it, it adds in " Media Description, name and address (m): audio 0 RTP/AVP 19". The originating carrier sees this and responds with audio instead of T38, the call drops. Any hints would be greatly appreaciated, I do not really want to go back to a previous release if I can avoid it. Connection Information (c): IN IP4 98.158.137.200 Time Description, active time (t): 0 0 Media Description, name and address (m): image 18392 udptl t38 Media Attribute (a): T38FaxVersion:0 Media Attribute (a): T38MaxBitRate:14400 Media Attribute (a): T38FaxFillBitRemoval Media Attribute (a): T38FaxRateManagement:transferredTCF Media Attribute (a): T38FaxMaxBuffer:2000 Media Attribute (a): T38FaxMaxDatagram:400 Media Attribute (a): T38FaxUdpEC:t38UDPRedundancy Connection Information (c): IN IP4 98.158.137.200 Time Description, active time (t): 0 0 Media Description, name and address (m): audio 0 RTP/AVP 19 Media Description, name and address (m): image 18392 udptl t38 Media Attribute (a): T38FaxVersion:0 Media Attribute (a): T38MaxBitRate:14400 Media Attribute (a): T38FaxFillBitRemoval Media Attribute (a): T38FaxRateManagement:transferredTCF Media Attribute (a): T38FaxMaxBuffer:2000 Media Attribute (a): T38FaxMaxDatagram:400 Media Attribute (a): T38FaxUdpEC:t38UDPRedundancy Darcy Voice2Net ------------------------------------------------------------------------------ _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org