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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
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?
    • jsnider's avatar
      jsnider
      Copper Contributor
      Apr 05, 2022
      BrianC614 Nope! I'll let you know as soon as we figure it out though! haha
      • BrianC614's avatar
        BrianC614
        Copper Contributor
        Apr 05, 2022
        https://support.sonus.net/display/UXDOC90/Best+Practice+-+Troubleshoot+Issues+with+Microsoft+Teams+Direct+Routing
        at the very bottom:
        "Replaces" Header
        Availability: Since 9.0.7

        MS Teams Direct Routing will stop processing inbound SIP Requests which have "Replaces" headers. This change is automatically done by the SBC Edge software upgrade. No configuration changes are needed. For more information, refer to MC299922.

        We're already on 11.0.0, so....