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DavidLau1395's avatar
DavidLau1395
Copper Contributor
Apr 02, 2021

Missing Refer from MS Teams for AA calls

Hi everyone,

 

I have a MS Teams Carrier setup and occasionally PSTN to AA then to MS Teams user transfer will fail. Investigation on SBC logs seems to indicate no REFER from MS Teams. MS Support believe they have sent the REFER.

Has anyone seen this issue before? 

MS Teams Direct Routing

5 Replies

  • fowler_23's avatar
    fowler_23
    Iron Contributor
    Apr 06, 2021
    I know you say the SBC doesn't receive a REFER but just in case, it's missed your checks. Are you also aware that there is some SBC configuration to be done around REFER.
    For Ribbon, refer here:
    https://support.sonus.net/display/UXDOC70/Best+Practice+-+Configuring+SBC+Edge+for+Microsoft+Teams+Direct+Routing#BestPractice-ConfiguringSBCEdgeforMicrosoftTeamsDirectRouting-forwardConfigureREFERandRe-InvitesforCallForwarding

    Audiocodes would have their own required configuration or any other vendor.

    Regards
    • DavidLau1395's avatar
      DavidLau1395
      Copper Contributor
      Apr 12, 2021
      Hi Fowler_23,

      Yes I well aware of the SBC config for REFER. However we can see from SIP Signalling trace that the SBC didn't receive REFER on the wire. Unfortunately we are not able to do third party packet trace on switch or router as all the signalling are encrypted.
      • Robinv65's avatar
        Robinv65
        Copper Contributor
        Dec 16, 2021

        DavidLau1395 

         

        Hi,

         

        Did you ever find the root cause for this issue? Experiencing this on two different tenants.

         

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