You have a Microsoft Teams Phone deployment that is used in the United States. You need to ensure that emergency calls placed to 9911. What should you configure?

A dial plan normalization rule can transform dialed digits into E.164 format but does not designate a call as an emergency or apply special emergency routing priority and behavior.

An emergency calling policy governs features such as dynamic location acquisition and security desk notification alerts, but it does not define the emergency dial strings or their routing path.

Emergency call routing policies in Teams Phone allow administrators to configure custom emergency dial strings - including strings like 9911 where users prepend a 9 expecting an outside line - and map them to PSTN usages that route to emergency services. This policy is the authoritative mechanism for defining what constitutes an emergency call and how it traverses the Direct Routing path.

An outbound PSTN number translation rule modifies caller or callee number presentation at the SBC level and has no role in classifying a dial string as an emergency call.