Teams Dynamic Emergency Calling

Microsoft Teams supports a Dynamic Emergency Calling feature. This feature allows the Microsoft tenant to associate physical address (campus) and building (floor and office) information together with network address and infrastructure so that the Teams user's physical location can be determined in the case that an emergency call is made via Teams.

When properly configured, Teams will include location information in the SIP messaging when a user dials a designated emergency number (e.g., 911 in the United States). That location information is known as PIDFConnecttoTeams Connector infrastructure is able to pass PIDF/LO data through to the customer PBX or Trunk endpoint if it is present in the SIP signaling.

Configuration of the Dynamic Emergency Calling in Teams is complex and is beyond the scope of this document, but Microsoft has a comprehensive documentation here. Briefly, there are several steps that the customer must complete in Teams Admin Center:

Set up location information.
Set up at least one Emergency Calling Policy and Emergency Call Routing Policy. Note that the Emergency Call Routing Policy should specify one of the Direct Routing PSTN Usage records.
Assign the Policies to the appropriate users.
Test the configuration in conjunction with the PBX, Carrier, and Emergency service provider.

Important Considerations

There are several important considerations when planning for tenants who may want to take advantage of this dynamic emergency calling feature:

In the event of an emergency call where the PIDF/LO is provided by Microsoft, the packet size will be too large for UDP transport. Therefore, it is important to select one of the TCP transport options when configuring your PBX or Trunk connection: UDP/TCP (uses TCP when packet size exceeds 1300 bytes), TCP, or TLS.
When the tenant has configured the location and policies for a user, any emergency call will have PIDF/LO data incorporated in their SIP INVITE. It is therefore imperative that the customer test to verify that the calling configuration (PBX/SBC/Carrier) supports this additional data and will complete the call to the correct endpoint.
End-users can check that Teams has their correct emergency location by looking in the Settings page of the Teams client under the Calls heading: