Microsoft PSTNhub rejects re-INVITE with 491 when MediaBypass is activated
Dear Community,
We recently updated our SBC towards Microsoft Teams to nnSCZ840p7 in order to fix an issue. Now a new issue has occured. Incoming calls from PSTN via SBC to Teams are failing when MediaBypass (a.k.a LMO) is active and SBC SW is nnSCZ840p7, because Microsoft PSTNhub rejects the re-INVITE for negotiation of LMO media path with 491. Microsoft says, this is a SBC fault. If I downgrade to nnSCZ840p6 it is working again, however then the other issue with failing PSTN-forwarded Teams-to-Teams calls is back.
Has anybody out there also seen this issue?
Best Regards
We recently updated our SBC towards Microsoft Teams to nnSCZ840p7 in order to fix an issue. Now a new issue has occured. Incoming calls from PSTN via SBC to Teams are failing when MediaBypass (a.k.a LMO) is active and SBC SW is nnSCZ840p7, because Microsoft PSTNhub rejects the re-INVITE for negotiation of LMO media path with 491. Microsoft says, this is a SBC fault. If I downgrade to nnSCZ840p6 it is working again, however then the other issue with failing PSTN-forwarded Teams-to-Teams calls is back.
Has anybody out there also seen this issue?
Best Regards
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