To enable dynamic emergency calling, which routes calls based on the user's real-time location, an administrator must configure an emergency calling policy. The "External location lookup mode" setting within this policy specifically controls this functionality. Enabling this setting allows Microsoft Teams to use the client's location information to determine the appropriate Public Safety Answering Point (PSAP) for an emergency call. The question specifies not to configure networks or locations, but only to enable the feature, which this policy change accomplishes.

1. Microsoft. (2024). Manage emergency calling policies in Microsoft Teams. Microsoft Learn. Retrieved from https://learn.microsoft.com/en-us/microsoftteams/manage-emergency-calling-policies. In the section "Create a custom emergency calling policy

" the setting "External location lookup mode" is described: "Turn this on to enable dynamic emergency calling. This setting controls whether a user's location is used to route emergency calls."