Forum Discussion

RDub2k4's avatar
RDub2k4
Copper Contributor
Apr 05, 2022

Direct Routing and call transfers/parks failing

We have a Ribbon SBC hosted in the cloud, and nothing has changed. It's been working flawlessly for several months, and today my SBC as well as a few clients can no longer transfer or park calls. Log...
Direct Routing
BrianC614's avatar
BrianC614
Copper Contributor
Apr 05, 2022
2x Azure Hosted Ribbon SBC SWe Edge (formerly known as SWe lite) 11.0.0. Literally no changes to the SBC, so it has to be a change on the Microsoft side. The SBCs don't update/change themselves! Have not contacted Ribbon, waiting on Microsoft to provide some direction, as it doesn't make sense for it to be a Ribbon issue.
jsnider's avatar
jsnider
Copper Contributor
Apr 05, 2022

BrianC614  Agreed, I do think it's likely something Microsoft changed or it could be an issue on their side they are unaware of. My fear is they changed something on their end permanently that we now need to adapt our configuration to. RDub2k4 and I work together so we are just trying to get this hashed out because it's affecting clients of ours as well as our own office. We will keep this thread updated with any new findings. If you wouldn't mind updating us if you learn anything new it would be much appreciated!

  • BrianC614's avatar
    BrianC614
    Copper Contributor
    Apr 05, 2022
    I agree. Microsoft support is already trying to blame Ribbon without even looking into what may have changed on their side. They are stating that the Ribbon SBC is sending a 503 service unavailable, which is true, but the question is what changed on Microsoft's side to cause that response? Really appreciate any feedback you get from Ribbon.
    • jsnider's avatar
      jsnider
      Copper Contributor
      Apr 05, 2022
      BrianC614 PhoneGuy Check this out, especially the area titled "Replace headers"
      https://docs.microsoft.com/en-us/microsoftteams/direct-routing-whats-new
      I bet that's our issue.
      • BrianC614's avatar
        BrianC614
        Copper Contributor
        Apr 05, 2022
        Thanks jsnider ! Any idea where to look for that in the Ribbon SBC config?
    • RDub2k4's avatar
      RDub2k4
      Copper Contributor
      Apr 05, 2022
      Waiting to hear back from Ribbon. I sent the logs and our configuration. We're getting the 500 Internal Server Error as well now. Edited our phone # and domain/IP out.

      SIP/2.0 500 Internal Server Error
      FROM: <sip:+Email address removed:5061;user=phone>;tag=afb0104-2ccf13;sgid=1
      TO: <sip:sip2.pstnhub.microsoft.com:5061>;tag=bec5e1dda8c24ca2b3a91f1e9e1e9f20
      CSEQ: 204 INVITE
      CALL-ID: Email address removed.X
      VIA: SIP/2.0/TLS XX.XXX.XXX.X:5061;branch=z9hG4bK-UX-0afb-0104-31a078
      REASON: Q.850;cause=47;text="4b4590df-0515-49bc-9f78-253a3990c28a;Call notification"
      CONTENT-LENGTH: 0
      ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY
      SERVER: Microsoft.PSTNHub.SIPProxy v.2022.4.4.11 i.EUNO.12