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Use this window to identify specific URN prefix values that identify emergency calls for a specific Visited Public Land Mobile Network (VPLMN) ID. In networks supporting the S8 Home Routing (S8HR) roaming model, any calls that are identified as emergency calls from users identified as outbound roaming users are processed so that the calls are handled by the visited network rather than the home network.
Refer to Emergency Call Handling for the Roaming Users in S8HR Model for more information.
On the SBC main screen, go to All > Profiles > Services > Vplmn Profile > Vplmn ID > Emergency Urn Prefix. The Emergency Urn Prefix window opens displaying all configured emergency urn prefixes.
You must associate each URN prefix with a specific VPLMN ID within a specific VPLMN profile. The option to create an emergency URN prefix only becomes available after you select a VPLMN profile and VPLMN ID.
Click New Emergency Urn Prefix. The Create New Emergency Urn Prefix window opens.
In Urn Prefix Entry, enter a prefix that identifies an emergency call. The prefix can be up to 27 alphanumeric characters.