Patent ID: 8462916

Claim:
A method for playing an enterprise Color RingBack Tone, CRBT, comprising: receiving, by a service switching entity, a call request comprising an Enterprise Virtual Centrex, EVC, access code from a source terminal, and establishing a connection with a service access entity in accordance with the EVC access code; receiving, by the service access entity, a service identifier of a destination terminal from the source terminal, searching for a connection identifier of the destination terminal corresponding to the service identifier of the destination terminal in accordance with a correspondence relationship between the service identifier and the connection identifier of the destination terminal, and sending the connection identifier of the destination terminal to Service Control Point, SCP; sending, by the SCP, a CONNECT message to the service switching entity, wherein, the CONNECT message comprises: the connection identifier of the destination terminal, a CRBT routing identifier, the EVC access code and a CRBT access identifier, and establishing, by the service switching entity, a connection between the source terminal and the destination terminal in accordance with the connection identifier of the destination terminal, and connecting, by the service switching entity, the call to the service access entity according to the CRBT routing identifier and the CRBT access identifier, playing, by the service access entity, an enterprise CRBT to the source terminal.