Forum Discussion

dvermeulen's avatar
dvermeulen
Copper Contributor
Dec 09, 2021

Teams rejects call with error 422

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!

 

Audio codes
Direct Routing
PSTN
teams
teams voice
  • Therese_Solimeno's avatar
    Therese_Solimeno
    Moderator
    Dec 09, 2021

    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.

    • Pieter007's avatar
      Pieter007
      Copper Contributor
      Feb 22, 2024
      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.
      • Pieter007's avatar
        Pieter007
        Copper Contributor
        Feb 22, 2024

        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

Resources