Microsoft Teams and Direct Routing – some calls are failing and marked as missed calls

I had the situation where Microsoft Teams is configured for Direct Routing and calls are dropped unexpectedly. We are using an Audiocodes SBC in Microsoft Azure and a SIP Trunk from Deutsche Telekom for the PSTN connection.

Sometimes an inbound call is signaled by Microsoft Teams for a second and then, it is dropped. In the Microsoft Teams activity feed a missed call is visible. Also, a missed call was shown in the activity feed even there was no ringing.

At first, I thought I could bring it down to cell phone calls only. But after asking my colleagues some users reported the same behaviour for calls coming from PBX systems.

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Unanswered Call handling in Microsoft Teams

Microsoft Teams is the teamwork hub with several communication modalities. You can initiate Peer-2-Peer Audio or Video calls, invite to online meetings. If you already deployed Microsoft Phone System or have installed Microsoft Teams Direct Routing, initiate or get PSTN calls.

But what is the call handling if you are away or you are logged off from Microsoft Teams?

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Microsoft Teams – Busy here

I guess it’s more an issue for European Microsoft Teams users but we European loves our busy signalling 😉

If you enable PSTN calling features in your Microsoft Teams environment, you will very fast recognize that there is no busy on busy for PSTN.

Arrives a second call while you are in a call with Microsoft Teams, there is actually no “Busy here”-signalling for the caller.

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