Patent ID: 8149998

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 sent by 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 sent by 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 the service switching entity; and after the service access entity sends the connection identifier of the destination terminal to the service witching entity and before the service switching entity establishes the connection between the source terminal and the destination terminal in accordance with the connection identifier of the destination terminal the method comprises: disconnecting by the service switching entity the connection with the service access entity; and after the service switching entity establishes the connection between the source terminal and the destination terminal in accordance with the connection identifier of the destination terminal and before the service access entity plays the enterprise CRBT to the source terminal the method further comprises: establishing by the service switching entity the connection with the service access entity; and playing, by the service access entity, an enterprise CRBT to the source terminal.