Patent ID: 8724777

Claim:
A method for implementing emergency call override service, comprising: receiving, by a second Service Call Session Control Function (S-CSCF) entity on a calling side, an initial request message including a service code from a calling party; passing-through, by the second S-CSCF entity, the initial request message including the service code to a second Application Server (AS) on the calling side; in the case that the service code is determined to be an emergency call override service access code, deleting, by the second AS, the service code from the initial request message, setting, by the second AS, a service identifier indicating the emergency call override service into the initial request message, and sending, by the second AS, the initial request message including the service identifier to the second S-CSCF entity; sending, by the second S-CSCF entity, the initial request message including the service identifier to a first S-CSCF entity on a called side; passing-through, by the first S-CSCF entity, the initial request message including the service identifier to a first AS on the called side; and implementing, by the first AS, the emergency call override service according to the service identifier.