[SR-Users] BYE not accepted by MS TEAMS

Hello all,

I recently built an SBC to integrate Kamailio with MS Teams following Henning Westerholt blob post and all the other awesome tips I was able to find here in the list.

Everything is working great. The only missing piece I would like some thoughts on is about why MS Teams is not accepting the BYE sent from Kamailio. It eventually replies with "504 Server Time-out"

The below trace shows the entire call.

|||||||||||||||||||| ==================== tag: rcv pid: 3381 process: 63 time: 1627070235.086307 date: Fri Jul 23 19:57:15 2021 proto: tls ipv4 srcip: 52.114.76.76 srcport: 4672 dstip: SBC_IP_ADDR dstport: 5061 ~~~~~~~~~~~~~~~~~~~~ INVITE sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone;transport=tls SIP/2.0 FROM: "Last, First Name"sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061 ;user=phone;tag=bafa0f5a573749a7b494917c0309f544 TO: sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone CSEQ: 1 INVITE CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e MAX-FORWARDS: 70 VIA: SIP/2.0/TLS 52.114.76.76:5061;branch=z9hG4bK60895c91 RECORD-ROUTE: sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr CONTACT: sip:api-du-b-usea2.pstnhub.microsoft.com:443 ;x-i=a82f1d71-4e21-42a8-8389-2ae26e54610f;x-c=c9b2aa4f658f5788aa7090bef0f5e35e/d/8/b14037a741dd46a79c74dce15912782c CONTENT-LENGTH: 1103 MIN-SE: 300 SUPPORTED: timer USER-AGENT: Microsoft.PSTNHub.SIPProxy v.2021.6.15.17 i.EUNO.0 CONTENT-TYPE: application/sdp ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY PRIVACY: id SESSION-EXPIRES: 3600

v=0 o=- 599625 0 IN IP4 127.0.0.1 s=session c=IN IP4 52.113.58.181 b=CT:10000000 t=0 0 m=audio 50122 RTP/SAVP 104 9 103 111 18 0 8 97 101 13 118 c=IN IP4 52.113.58.181 a=rtcp:50123 a=ice-ufrag:fTy/ a=ice-pwd:tQKGN0Szi7Q/vTdf6SiXUSpj a=rtcp-mux a=candidate:1 1 UDP 2130706431 52.113.58.181 50122 typ srflx raddr 10.0.33.230 rport 50122 a=candidate:1 2 UDP 2130705918 52.113.58.181 50123 typ srflx raddr 10.0.33.230 rport 50123 a=candidate:2 1 tcp-act 2121006078 52.113.58.181 49152 typ srflx raddr 10.0.33.230 rport 49152 a=candidate:2 2 tcp-act 2121006078 52.113.58.181 49152 typ srflx raddr 10.0.33.230 rport 49152 a=label:main-audio a=mid:1 a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:PC00Mgk39GjTYJ+mUSNQg++TU6zJKar4VYDj4/ET|2^31 a=sendrecv a=rtpmap:104 SILK/16000 a=rtpmap:9 G722/8000 a=rtpmap:103 SILK/8000 a=rtpmap:111 SIREN/16000 a=fmtp:111 bitrate=16000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=no a=rtpmap:0 PCMU/8000 a=rtpmap:8 PCMA/8000 a=rtpmap:97 RED/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=rtpmap:13 CN/8000 a=rtpmap:118 CN/16000 a=ptime:20 |||||||||||||||||||| ==================== tag: snd pid: 3381 process: 63 time: 1627070235.089106 date: Fri Jul 23 19:57:15 2021 proto: tls ipv4 srcip: SBC_IP_ADDR srcport: 5061 dstip: 52.114.76.76 dstport: 4672 ~~~~~~~~~~~~~~~~~~~~ SIP/2.0 100 trying -- your call is important to us FROM: "Last, First Name"sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061 ;user=phone;tag=bafa0f5a573749a7b494917c0309f544 TO: sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone CSEQ: 1 INVITE CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e VIA: SIP/2.0/TLS 52.114.76.76:5061;branch=z9hG4bK60895c91;rport=4672 Server: kamailio (5.3.7 (x86_64/linux)) Content-Length: 0

|||||||||||||||||||| ==================== tag: snd pid: 3291 process: 18 time: 1627070235.111825 date: Fri Jul 23 19:57:15 2021 proto: tls ipv4 srcip: SBC_IP_ADDR srcport: 5061 dstip: 52.114.76.76 dstport: 4672 ~~~~~~~~~~~~~~~~~~~~ SIP/2.0 180 Ringing FROM: "Last, First Name"sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061 ;user=phone;tag=bafa0f5a573749a7b494917c0309f544 t:sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone;tag=e55N8paBUgZac CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e CSEQ: 1 INVITE m:sip:+5515XXXXXXXXX@192.168.1.254:5060;transport=udp User-Agent:FreeSWITCH-mod_sofia/1.10.3-release~64bit Accept:application/sdp Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY k:path,replaces u:talk,hold,conference,refer l:0 Via: SIP/2.0/TLS 52.114.76.76:5061;rport=4672;branch=z9hG4bK60895c91 Record-Route: sip:192.168.1.253:5060 ;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on,sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on Record-Route: sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr P-SR-XBranch: z9hG4bKe7d4.5ae277881edb9c04a7ac65af016e582e.0

|||||||||||||||||||| ==================== tag: snd pid: 3298 process: 21 time: 1627070245.043621 date: Fri Jul 23 19:57:25 2021 proto: tls ipv4 srcip: SBC_IP_ADDR srcport: 5061 dstip: 52.114.76.76 dstport: 4672 ~~~~~~~~~~~~~~~~~~~~ SIP/2.0 183 Session Progress FROM: "Last, First Name"sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061 ;user=phone;tag=bafa0f5a573749a7b494917c0309f544 t:sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone;tag=e55N8paBUgZac CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e CSEQ: 1 INVITE m:sip:+5515XXXXXXXXX@192.168.1.254:5060;transport=udp User-Agent:FreeSWITCH-mod_sofia/1.10.3-release~64bit Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY k:path,replaces u:talk,hold,conference,refer c:application/sdp Content-Disposition:session l:323 Via: SIP/2.0/TLS 52.114.76.76:5061;rport=4672;branch=z9hG4bK60895c91 Record-Route: sip:192.168.1.253:5060 ;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on,sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on Record-Route: sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr P-SR-XBranch: z9hG4bKe7d4.5ae277881edb9c04a7ac65af016e582e.0

v=0 o=FreeSWITCH 1627045233 1627045234 IN IP4 SBC_IP_ADDR s=FreeSWITCH c=IN IP4 SBC_IP_ADDR t=0 0 m=audio 49692 RTP/SAVP 0 101 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=ptime:20 a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:eMGqj0jubamtvLsI/E/YSj8UqNKgUB5DTHGWc7PY a=nortpproxy:yes

|||||||||||||||||||| ==================== tag: snd pid: 3293 process: 19 time: 1627070255.938770 date: Fri Jul 23 19:57:35 2021 proto: tls ipv4 srcip: SBC_IP_ADDR srcport: 5061 dstip: 52.114.76.76 dstport: 4672 ~~~~~~~~~~~~~~~~~~~~ SIP/2.0 200 OK FROM: "Last, First Name"sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061 ;user=phone;tag=bafa0f5a573749a7b494917c0309f544 t:sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone;tag=e55N8paBUgZac CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e CSEQ: 1 INVITE m:sip:+5515XXXXXXXXX@192.168.1.254:5060;transport=udp User-Agent:FreeSWITCH-mod_sofia/1.10.3-release~64bit Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY k:path,replaces u:talk,hold,conference,refer c:application/sdp Content-Disposition:session l:323 Via: SIP/2.0/TLS 52.114.76.76:5061;rport=4672;branch=z9hG4bK60895c91 Record-Route: sip:192.168.1.253:5060 ;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on,sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on Record-Route: sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr P-SR-XBranch: z9hG4bKe7d4.5ae277881edb9c04a7ac65af016e582e.0

v=0 o=FreeSWITCH 1627045233 1627045234 IN IP4 SBC_IP_ADDR s=FreeSWITCH c=IN IP4 SBC_IP_ADDR t=0 0 m=audio 49692 RTP/SAVP 0 101 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=ptime:20 a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:eMGqj0jubamtvLsI/E/YSj8UqNKgUB5DTHGWc7PY a=nortpproxy:yes

|||||||||||||||||||| ==================== tag: rcv pid: 3370 process: 57 time: 1627070255.957735 date: Fri Jul 23 19:57:35 2021 proto: tls ipv4 srcip: 52.114.76.76 srcport: 4672 dstip: SBC_IP_ADDR dstport: 5061 ~~~~~~~~~~~~~~~~~~~~ ACK sip:+5515XXXXXXXXX@192.168.1.254:5060;transport=udp SIP/2.0 FROM: "Last, First Name"sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061 ;user=phone;tag=bafa0f5a573749a7b494917c0309f544 TO: sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone;tag=e55N8paBUgZac CSEQ: 1 ACK CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e MAX-FORWARDS: 70 VIA: SIP/2.0/TLS 52.114.76.76:5061;branch=z9hG4bKe3747d68 CONTACT: sip:api-du-b-usea2.pstnhub.microsoft.com:443 ;x-i=a82f1d71-4e21-42a8-8389-2ae26e54610f;x-c=c9b2aa4f658f5788aa7090bef0f5e35e/d/8/b14037a741dd46a79c74dce15912782c CONTENT-LENGTH: 0 USER-AGENT: Microsoft.PSTNHub.SIPProxy v.2021.6.15.17 i.EUNO.0 ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY Route: sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on Route: sip:192.168.1.253:5060 ;r2=on;ftag=bafa0f5a573749a7b494917c0309f544;lr=on P-SR-XUID: atpsh-60fb1b5d-d35-1

|||||||||||||||||||| ==================== tag: snd pid: 3302 process: 23 time: 1627070275.228363 date: Fri Jul 23 19:57:55 2021 proto: tls ipv4 srcip: SBC_IP_ADDR srcport: 5061 dstip: 52.114.75.24 dstport: 5061 ~~~~~~~~~~~~~~~~~~~~ BYE sip:52.114.76.76:4672;x-i=a82f1d71-4e21-42a8-8389-2ae26e54610f;x-c=c9b2aa4f658f5788aa7090bef0f5e35e/d/8/b14037a741dd46a79c74dce15912782c SIP/2.0 Record-Route: sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=e55N8paBUgZac;lr=on Record-Route: sip:192.168.1.253:5060;r2=on;ftag=e55N8paBUgZac;lr=on Via: SIP/2.0/TLS SBC_IP_ADDR:5061;branch=z9hG4bK92fc.fcb147cf8e5e6e6e960d0f2401ad6383.0 v:SIP/2.0/UDP 192.168.1.254;received=192.168.1.254;rport=5060;branch=z9hG4bKgvXrQrcNjNj3m f:sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone;tag=e55N8paBUgZac t:"Last, First Name"sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061 ;user=phone;tag=bafa0f5a573749a7b494917c0309f544 i:c9b2aa4f658f5788aa7090bef0f5e35e CSeq:38981345 BYE User-Agent:FreeSWITCH-mod_sofia/1.10.3-release~64bit Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY k:path,replaces Reason:Q.850;cause=16;text="NORMAL_CLEARING" Max-Forwards: 64 l:0 Route: sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr P-SR-XUID: atpsh-60fb1b5d-d35-1

|||||||||||||||||||| ==================== tag: rcv pid: 3385 process: 65 time: 1627070300.423499 date: Fri Jul 23 19:58:20 2021 proto: tls ipv4 srcip: 52.114.75.24 srcport: 5061 dstip: SBC_IP_ADDR dstport: 5061 ~~~~~~~~~~~~~~~~~~~~ SIP/2.0 504 Server Time-out FROM: sip:+5515XXXXXXXXX@SBC-FQDN:5061;user=phone;tag=e55N8paBUgZac TO: "Last, First Name"sip:+8979994;ext=01180@sip.pstnhub.microsoft.com:5061 ;user=phone;tag=bafa0f5a573749a7b494917c0309f544 CSEQ: 38981345 BYE CALL-ID: c9b2aa4f658f5788aa7090bef0f5e35e VIA: SIP/2.0/TLS SBC_IP_ADDR:5061;branch=z9hG4bK92fc.fcb147cf8e5e6e6e960d0f2401ad6383.0 CONTENT-LENGTH: 0 ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY SERVER: Microsoft.PSTNHub.SIPProxy v.2021.6.15.17 i.EUWE.3 Via: SIP/2.0/UDP 192.168.1.254;received=192.168.1.254;rport=5060;branch=z9hG4bKgvXrQrcNjNj3m Record-Route: sip:SBC-FQDN:5061;transport=tls;r2=on;ftag=e55N8paBUgZac;lr=on,sip:192.168.1.253:5060 ;r2=on;ftag=e55N8paBUgZac;lr=on P-SR-XBranch: z9hG4bK92fc.fcb147cf8e5e6e6e960d0f2401ad6383.0