It seems that you are sending the BYE over UDP instead of TCP/TLS.

-ovidiu

On Tue, Jan 28, 2025 at 12:52 Barry Flanagan via sr-users <
[email protected]> wrote:

> Hi all,
>
> I have a Teams gw working apart from one issue., In a call originated in
> Teams,. if the called party hangs up, the BYE is sent to
> api-du-b-euwe.pstnhub.microsoft.com:443 which does not work. This is
> taken from the Contact header of the ACK I presume.
>
> Here is the ACK to the 200 OK:
>
> 28/01/2025 17:08:26.560 +00:00: 52.114.75.24:53728 -> 100.100.198.241:5061
> ACK sip:[email protected]:5061;transport=tls;tps=atpsh-67990f01-8ed8-1
> SIP/2.0
> FROM:  "Teams User" <sip:[email protected]
> :5061;user=phone>;tag=c29cb7a79ddf40f9ba909f3f1034a770
> TO:  <sip:[email protected]:5061>;user=phone;tag=as6e287620
> CSEQ:  1 ACK
> CALL-ID:  e49f7df631ee576286ecf159e81952fe
> MAX-FORWARDS:  70
> VIA:  SIP/2.0/TLS 52.114.75.24:5061;branch=z9hG4bK46d28f33
> CONTACT:  <sip:api-du-b-euwe.pstnhub.microsoft.com:443
> ;x-i=0781e8a1-91e6-4f6a-bc4a-73d6890827d4;x-c=e49f7df631ee576286ecf159e81952fe/d/8/703117d8337e4975a8216a54f59035c2>
> CONTENT-LENGTH:  0
> USER-AGENT:  Microsoft.PSTNHub.SIPProxy v.2025.1.20.11 i.EUWE.7
> ALLOW:  INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY
>
> ..and here is the BYE.
>
> 28/01/2025 17:08:36.119 +00:00: 100.100.198.241:5060 -> 52.123.134.13:443
> BYE 
> sip:api-du-b-euwe.pstnhub.microsoft.com:443;x-i=0781e8a1-91e6-4f6a-bc4a-73d6890827d4;x-c=e49f7df631ee576286ecf159e81952fe/d/8/703117d8337e4975a8216a54f59035c2
> SIP/2.0
> Record-Route:  <sip:teams.domain.com:5061
> ;transport=tls;ftag=as6e287620;lr;r2=on>
> Record-Route:  <sip:100.100.198.241:5060;ftag=as6e287620;lr;r2=on>
> Via:  SIP/2.0/UDP
> 100.100.198.241;branch=z9hG4bKc89c.0c1cf04a771c30293432e5f1f59331c8.0
> Via:  SIP/2.0/UDP 102.102.139.182:5060;rport=5060;branch=z9hG4bK3c42c163
> Max-Forwards:  69
> From:  <sip:[email protected]:5061>;user=phone;tag=as6e287620
> To:  "Teams User"<sip:[email protected]
> :5061;user=phone>;tag=c29cb7a79ddf40f9ba909f3f1034a770
> Call-ID: e49f7df631ee576286ecf159e81952fe
> CSeq:  102 BYE
> Content-Length:  0
>
> How can I get around this? Using a pretty standard WITHINDLG route. I am
> using topos but not manipulating the Contact header.
>
> Thanks!
>
> -Barry
>
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