If an emergency call successfully leaves your network but does not get routed to the correct PSAP, refer to these possible points of failure:
Is Cisco Emergency Responder configured to assign the correct Emergency Location Identification Number (ELIN) to the ERL assigned to the phone? Emergency calls are routed based on the ELIN, so if you assign the wrong ELIN, the call is not routed correctly. Refer to the Creating ERLs section of Configuring Cisco Emergency Responder.
If the ELIN is correct, is the ELIN's route pattern configured to use the correct gateway? If you select the wrong gateway, the call might be routed to a part of the service provider's network that cannot connect to the desired PSAP. Consult with your service provider to determine gateway requirements. Refer to the following topics:
Does the emergency caller's phone register with a Cisco CallManager cluster supported by a different Cisco Emergency Responder group than the Cisco Emergency Responder group that supports the originating switch port? Then you might have a miss-configured Cisco Emergency Responder cluster.
Note: If the call reaches the PSAP, but the PSAP cannot talk to the caller, ensure that the Cisco CallManager for the remote Cisco Emergency Responder group has the Cisco CallManager for the local Cisco Emergency Responder group defined as a gateway.