Hi Daniel,

Thanks for your reply. Yes, I'm using the topos module. When I tried to run without it I actually had more issue with the call flow not being able to even establish the call.

But your comment of not having both the both incoming and outgoing sip messages in the trace actually gave some additional clues and I was now able to fix the issue. The problem happens because I was using "fix_nated_contact()" in the INVITE received from Teams.

With that the Contact header received in the INVITE as: CONTACT: sip:api-du-b-usea2.pstnhub.microsoft.com:443 ;x-i=a82f1d71-4e21-42a8-8389-2ae26e54610f;x-c=c9b2aa4f658f5788aa7090bef0f5e35e/d/8/b14037a741dd46a79c74dce15912782c is forwarded as: CONTACT: sip:52.114.76.76:4672 ;x-i=a82f1d71-4e21-42a8-8389-2ae26e54610f;x-c=c9b2aa4f658f5788aa7090bef0f5e35e/d/8/b14037a741dd46a79c74dce15912782c

Which is then used to construct the BYE that is not accepted by Teams.

Removing that line fixes the issue.

Thanks again!

Em ter., 27 de jul. de 2021 às 11:01, Daniel-Constantin Mierla < miconda@gmail.com> escreveu:

Hello,

are you using topos module?

If yes, can you try without it and see if there is any difference?

Also, the sip trace you pasted in the previous message does not have both incoming and outgoing sip messages -- having them is useful for troubleshooting.

Cheers, Daniel On 23.07.21 22:16, João Vitor Arruda wrote:

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

---

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-- Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda