Hello, I currently use Freeswitch 1.6.8-1 in production, and have some ISDN gateways sending SDP including T.38 for voice calls (not faxes). Calls are handled without problems by freeswitch. I have another platform, with freeswitch 1.6.19 and same configuration. However, voice calls received with SDP including t.38 are rejected with 488 INCOMPATIBLE_DESTINATION : ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_media.c:4028 sofia/internal_1/33183817938@gv-ics-prd-301 T38 REFUSE on request ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [NOTICE] sofia.c:7566 Hangup sofia/internal_1/33183817938@gv-ics-prd-301 [CS_NEW] [INCOMPATIBLE_DESTINATION] I didn't find any valid configuration to make those calls accepted, except configuring proxy_media, which I don't want to use. Is this behaviour a "normal" behaviour ? Could it be a bug ? This is a very big issue for us ... Here is the log extract : recv 1391 bytes from udp/[10.9.30.152]:5060 at 23:47:39.443941: ------------------------------------------------------------------------ INVITE sip:0170993660@10.9.30.188:5060 SIP/2.0 Record-Route: <sip:10.9.30.152;lr=on> Record-Route: <sip:10.3.1.220;lr=on> Via: SIP/2.0/UDP 10.9.30.152;branch=z9hG4bK51d.d7e922c4.0 Via: SIP/2.0/UDP 10.3.1.220;branch=z9hG4bK51d.ba6f34d1.0 Via: SIP/2.0/UDP 10.3.1.231;branch=z9hG4bKac1339541470 Max-Forwards: 68 From: <sip:33183817938@gv-ics-prd-301>;tag=1c1339531455 To: <sip:0170993660@10.3.1.220;user=phone> Call-ID: 13395229682542018214736@10.3.1.231 CSeq: 1 INVITE Contact: <sip:33183817938@10.3.1.231:5060> Supported: em,100rel,timer,replaces,path,resource-priority,sdp-anat Allow: REGISTER,OPTIONS,INVITE,ACK,CANCEL,BYE,NOTIFY,PRACK,REFER,INFO,SUBSCRIBE,UPDATE Remote-Party-ID: <sip:33183817938@10.3.1.220
;party=calling;privacy=off;screen=yes;screen-ind=3;npi=1;ton=1 Remote-Party-ID: <sip:0170993660@10.3.1.220>;party=called;npi=1;ton=2 User-Agent: Audiocodes-Sip-Gateway-Mediant 3000/v.6.00A.056 Content-Type: application/sdp Content-Length: 417
v=0 o=AudiocodesGW 1339507326 1339507042 IN IP4 10.3.1.231 s=Phone-Call c=IN IP4 10.3.1.231 t=0 0 m=audio 23970 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=ptime:20 a=sendrecv m=image 23972 udptl t38 a=T38FaxVersion:0 a=T38MaxBitRate:33600 a=T38FaxMaxBuffer:3000 a=T38FaxMaxDatagram:560 a=T38FaxRateManagement:transferredTCF a=T38FaxUdpEC:t38UDPRedundancy ------------------------------------------------------------------------ send 477 bytes to udp/[10.9.30.152]:5060 at 23:47:39.444372: ------------------------------------------------------------------------ SIP/2.0 100 Trying Via: SIP/2.0/UDP 10.9.30.152;branch=z9hG4bK51d.d7e922c4.0 Via: SIP/2.0/UDP 10.3.1.220;branch=z9hG4bK51d.ba6f34d1.0 Via: SIP/2.0/UDP 10.3.1.231;branch=z9hG4bKac1339541470 Record-Route: <sip:10.9.30.152;lr=on> Record-Route: <sip:10.3.1.220;lr=on> From: <sip:33183817938@gv-ics-prd-301>;tag=1c1339531455 To: <sip:0170993660@10.3.1.220;user=phone> Call-ID: 13395229682542018214736@10.3.1.231 CSeq: 1 INVITE User-Agent: FreeSWITCH Content-Length: 0 ------------------------------------------------------------------------ ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [NOTICE] switch_channel.c:1104 New Channel sofia/internal_1/33183817938@gv-ics-prd-301 [ba17b1eb-961d-43fe-b820-cb469a8f292d] ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_state_machine.c:584 (sofia/internal_1/33183817938@gv-ics-prd-301) Running State Change CS_NEW (Cur 1 Tot 69) ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] sofia.c:9874 sofia/internal_1/33183817938@gv-ics-prd-301 receiving invite from 10.9.30.152:5060 version: 1.6.19 64bit ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] sofia.c:7085 Channel sofia/internal_1/33183817938@gv-ics-prd-301 entering state [received][100] ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] sofia.c:7095 Remote SDP: ba17b1eb-961d-43fe-b820-cb469a8f292d v=0^M ba17b1eb-961d-43fe-b820-cb469a8f292d o=AudiocodesGW 1339507326 1339507042 IN IP4 10.3.1.231^M ba17b1eb-961d-43fe-b820-cb469a8f292d s=Phone-Call^M ba17b1eb-961d-43fe-b820-cb469a8f292d c=IN IP4 10.3.1.231^M ba17b1eb-961d-43fe-b820-cb469a8f292d t=0 0^M ba17b1eb-961d-43fe-b820-cb469a8f292d m=audio 23970 RTP/AVP 8 101^M ba17b1eb-961d-43fe-b820-cb469a8f292d a=rtpmap:8 PCMA/8000^M ba17b1eb-961d-43fe-b820-cb469a8f292d a=rtpmap:101 telephone-event/8000^M ba17b1eb-961d-43fe-b820-cb469a8f292d a=fmtp:101 0-15^M ba17b1eb-961d-43fe-b820-cb469a8f292d a=ptime:20^M ba17b1eb-961d-43fe-b820-cb469a8f292d m=image 23972 udptl t38^M ba17b1eb-961d-43fe-b820-cb469a8f292d a=T38FaxVersion:0^M ba17b1eb-961d-43fe-b820-cb469a8f292d a=T38MaxBitRate:33600^M ba17b1eb-961d-43fe-b820-cb469a8f292d a=T38FaxMaxBuffer:3000^M ba17b1eb-961d-43fe-b820-cb469a8f292d a=T38FaxMaxDatagram:560^M ba17b1eb-961d-43fe-b820-cb469a8f292d a=T38FaxRateManagement:transferredTCF^M ba17b1eb-961d-43fe-b820-cb469a8f292d a=T38FaxUdpEC:t38UDPRedundancy^M ba17b1eb-961d-43fe-b820-cb469a8f292d ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[PCMA:8:8000:20:64000:1] ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_media.c:4504 Audio Codec Compare [PCMA:8:8000:20:64000:1] ++++ is saved as a match ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_media.c:4449 Audio Codec Compare [PCMA:8:8000:20:64000:1]/[PCMU:0:8000:20:64000:1] ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_media.c:4365 Set telephone-event payload to 101@8000 ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_media.c:3061 Set Codec sofia/internal_1/33183817938@gv-ics-prd-301 PCMA/8000 20 ms 160 samples 64000 bits 1 channels ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_codec.c:111 sofia/internal_1/33183817938@gv-ics-prd-301 Original read codec set to PCMA:8 ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_media.c:4708 Set telephone-event payload to 101@8000 ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_media.c:4767 sofia/internal_1/33183817938@gv-ics-prd-301 Set 2833 dtmf send payload to 101 recv payload to 101 ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_media.c:4028 sofia/internal_1/33183817938@gv-ics-prd-301 T38 REFUSE on request ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [NOTICE] sofia.c:7566 Hangup sofia/internal_1/33183817938@gv-ics-prd-301 [CS_NEW] [INCOMPATIBLE_DESTINATION] ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_state_machine.c:603 (sofia/internal_1/33183817938@gv-ics-prd-301) State NEW ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_state_machine.c:584 (sofia/internal_1/33183817938@gv-ics-prd-301) Running State Change CS_HANGUP (Cur 1 Tot 69) ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_state_machine.c:850 (sofia/internal_1/33183817938@gv-ics-prd-301) Callstate Change DOWN -> HANGUP ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_state_machine.c:852 (sofia/internal_1/33183817938@gv-ics-prd-301) State HANGUP ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] mod_sofia.c:438 Channel sofia/internal_1/33183817938@gv-ics-prd-301 hanging up, cause: INCOMPATIBLE_DESTINATION ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] mod_sofia.c:577 Responding to INVITE with: 488 ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_state_machine.c:60 sofia/internal_1/33183817938@gv-ics-prd-301 Standard HANGUP, cause: INCOMPATIBLE_DESTINATION ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_state_machine.c:852 (sofia/internal_1/33183817938@gv-ics-prd-301) State HANGUP going to sleep ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_state_machine.c:619 (sofia/internal_1/33183817938@gv-ics-prd-301) State Change CS_HANGUP -> CS_REPORTING ba17b1eb-961d-43fe-b820-cb469a8f292d 2018-04-25 23:47:39.434491 [DEBUG] switch_core_state_machine.c:584 (sofia/internal_1/33183817938@gv-ics-prd-301) Running State Change CS_REPORTING (Cur 1 Tot 69) send 784 bytes to udp/[10.9.30.152]:5060 at 23:47:39.446918: ------------------------------------------------------------------------ SIP/2.0 488 Not Acceptable Here Via: SIP/2.0/UDP 10.9.30.152;branch=z9hG4bK51d.d7e922c4.0 Via: SIP/2.0/UDP 10.3.1.220;branch=z9hG4bK51d.ba6f34d1.0 Via: SIP/2.0/UDP 10.3.1.231;branch=z9hG4bKac1339541470 Max-Forwards: 68 From: <sip:33183817938@gv-ics-prd-301>;tag=1c1339531455 To: <sip:0170993660@10.3.1.220;user=phone>;tag=9USNQNQDByZ6a Call-ID: 13395229682542018214736@10.3.1.231 CSeq: 1 INVITE User-Agent: FreeSWITCH Accept: application/sdp Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REFER, NOTIFY Supported: timer, path, replaces Allow-Events: talk, hold, conference, refer Reason: Q.850;cause=88;text="INCOMPATIBLE_DESTINATION" Content-Length: 0 Remote-Party-ID: "0170993660" <sip:0170993660@10.3.1.220
;party=calling;privacy=off;screen=no
Thanks with anticipation D. Jeannerod