Teams rejects call with error 422

[dvermeulen]

Hi all,

I'm having some trouble with calling from a Swyx pbx to Microsoft Teams direct routing. 

When I place a call from Swyx pbx to Teams, the call get's denied. When I checked the logs I noticed the following:

422 Session Interval Too Small error

Teams is rejecting the call because Swyx is sending a 90 sconds field in the Session Expires Header. 

I searched the web for adjusting the allow Session Expire field in Teams but can't find anything.

According to this document:

https://datatracker.ietf.org/doc/html/rfc4028

The rule is to have at least a 90 seconds Header. So Swyx does nothing wrong with that.

Can anybody help me with this? Or point me in a good direction.

Thanks!

[#2]

Hi @dvermeulen  If you don't get a timely response from this community, you might want to open a ticket at answers.microsoft.com tech support, where authorized MSFT agents can troubleshoot an issue until it's resolved.

[#3]

Has the issue been resolved, having the same issue.
Call forwarding to external number works but when the carrier sends a new re-invite Teams returns with 422 Session Interval Too Small and the call gets dropped.

[#4]

This is my failed log, very desperate, MS case opened for a month now. 
---- Incoming SIP Message from 52.114.76.76:5061 to SIPInterface #2 (SIP_Teams) TLS TO(#919) SocketID(5762094) ---- [Time:16-02@12:32:31.466]

SIP/2.0 422 Session Interval Too Small
FROM: <sip:xxxxx
TO: <sip:+xxxxxx
CSEQ: 2 INVITE
CALL-ID: xxxxxx
VIA: SIP/2.0/TLS xxxxx
REASON: Q.850;cause=127;text="d71eea37-6fc6-4ddf-8291-dfb20edb98ff;Session Interval Too Small"
CONTENT-LENGTH: 0
MIN-SE: 300
ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY
SERVER: Microsoft.PSTNHub.SIPProxy v.2024.2.6.5 i.EUNO.12