Hello, I am working with 1.8.32.2 which I have patched with t38-gateway and PRACK. t38 is tested and working fine with Zoiper client but I can't get the t.38 software from Biscom (FAXCOM) to talk. In my first attempts I found FAXCOM announces that it supports 100rel so I added the PRACK patch hoping that would do the trick. Now it gets a little further but * complains about rejecting a non-primary audio stream. Could this be a problem with 1.8 not liking the second media stream or is there some more configuration tweaking to be done? --- CUT ---------------------------------------------- <--- SIP read from UDP:192.168.1.13:5060 ---> INVITE sip:1XXXXXXXXXX at 192.168.1.11 SIP/2.0 From: Biscom <sip:418 at 192.168.1.13>;tag=86c9140-d281eac-13c4-55013-1f571-33180d4a-1f571 To: <sip:1XXXXXXXXXX at 192.168.1.11> Call-ID: 73cb2e8-d281eac-13c4-55013-1f571-7ef285e4-1f571 CSeq: 2 INVITE Via: SIP/2.0/UDP 192.168.1.13:5060;branch=z9hG4bK-1f571-7a6c245-2c788e59 Supported: 100rel Max-Forwards: 70 User-Agent: Brktsip/6.6.9B12 (Dialogic) Contact: <sip:192.168.1.13> Authorization: Digest username="418",realm="asterisk",nonce="37a417d1",uri="sip:1XXXXXXXXXX at 192.168.1.11",response="6cdb70491bdaf9acc75d9b776101d111",algorithm=MD5 Content-Type: application/sdp Content-Length: 220 v=0 o=418 2209120086 0667748000 IN IP4 192.168.1.13 s=no_session_name t=0 0 m=audio 56040 RTP/AVP 0 c=IN IP4 192.168.1.13 a=rtpmap:0 pcmu/8000 m=audio 56040 RTP/AVP 8 c=IN IP4 192.168.1.13 a=rtpmap:8 pcma/8000 <-------------> --- (13 headers 10 lines) --- Sending to 192.168.1.13:5060 (no NAT) Using INVITE request as basis request - 73cb2e8-d281eac-13c4-55013-1f571-7ef285e4-1f571 Found peer '418' for '418' from 192.168.1.13:5060 == Using SIP RTP TOS bits 184 == Using SIP RTP CoS mark 5 Found RTP audio format 0 Found audio description format pcmu for ID 0 [2015-02-12 23:36:58] WARNING[13727]: chan_sip.c:9305 process_sdp: Rejecting non-primary audio stream: audio 56040 RTP/AVP 8 <--- Reliably Transmitting (no NAT) to 192.168.1.13:5060 ---> SIP/2.0 488 Not acceptable here Via: SIP/2.0/UDP 192.168.1.13:5060;branch=z9hG4bK-1f571-7a6c245-2c788e59;received=192.168.1.13 From: Biscom <sip:418 at 192.168.1.13>;tag=86c9140-d281eac-13c4-55013-1f571-33180d4a-1f571 To: <sip:1XXXXXXXXXX at 192.168.1.11>;tag=as7bee4e61 Call-ID: 73cb2e8-d281eac-13c4-55013-1f571-7ef285e4-1f571 CSeq: 2 INVITE Server: FPBX-12.0.37(1.8.32.2) Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, PRACK, MESSAGE Supported: replaces, timer, 100rel Content-Length: 0 --- CUT ---------------------------------------------- TIA -- Andrew McRory Sayso Communications, Inc. Tallahassee, Florida