Issue with Microsoft Teams client app when receiving a call

Question

Hello everyone,

I have an issue when trying to call to a DID number configured in a team's user. Calls are making through an Opensips SBC that I'm configuring. The scenario is as follows:

Microsoft client (DID number) <--> Microsoft SIP server <--> SBC <--> Calling part

The problem is that when I make a call to the DID number, the teams app picks up the call but at the same time, starts a new one to the telephone number where the call comes from. The signalization between my SBC and the Microsoft Server is ike this:

Microsoft server <-- Invite -- SBC

Microsoft server -- 180 --> SBC

Microsoft server -- 183 --> SBC

Microsoft server -- 200 --> SBC (when picks up the call, generates a new one)

The audio starts and audio is clear between both sides but after 20 seconds the call hangs up and at "Call history" on teams, the call is shown as a "missed call".

I'm not sure what is wrong on my side but not able to see anything from teams side as the whole communication is all over TLS.

Is there something that I need to fix on the RTCP offer, how can I troubleshoot this?

Any suggestion is more than welcome.

Thanks,

Diego

Answer 1

Hi DiegoOzuna,
Does anyone else have the same issue?
Health Dashboard for Direct routing can monitor the connection, including SBC, telephony service, network parameters, between your Session Border Controller (SBC) and the Direct Routing interface.
You can view Health Dashboard in the Microsoft Teams Admin Center as the following image.

For more details about how to check the information in Health Dashboard, you can refer to this link: https://learn.microsoft.com/en-us/microsoftteams/direct-routing-health-dashboard.
Moreover, you can verify the steps of configuring direct routing as this link: https://learn.microsoft.com/en-us/microsoftteams/direct-routing-configure.