With this feature, Communication Manager receives emergency SIP trunk calls made by H.323 visiting users.

For example, a user from Location A is travelling on business to Location B. Location A and Location B can be controlled by the same Communication Manager or different Communication Manager managed by a single System Manager. An emergency call made by the user at Location B routes to the nearest possible PSAP agency in Location B even if the user dials the emergency number of Location A. Depending upon the station configuration, the CPN can be the station extension or ELIN of the user. The attendant endpoints at Location B display the calling party number (CPN) as the identity of the user. PSAP receives the CPN that is sent over a PSTN trunk as the identity of the user.

If an emergency call disconnects, PSAP calls back the CPN. Communication Manager forwards the call to the phone that made the emergency call. In the Emergency Extension Forwarding (min) field, you can set the time in minutes for the trunk to forward the call to the extension that made the emergency call. This field is available on the Feature-related system parameters screen.