Method, device, and system for implementing communication services

A Mobile Switch Center (MSC), comprising:

• a receiver, adapted to receive a call request initiated by a user;
• a determining module, adapted to determine whether the user subscribes to an IP Centrex service and an intelligent network (IN) service according to obtained subscription information of the user;
• a checking module, adapted to check with an application server (AS) whether a call request is for an intra-group call when the determining module determines that the user subscribes to the IP Centrex service and the IN service;
• a storing module adapted to store a record of connecting the call to the AS when the determining module determines that the user subscribes to the IP Centrex service and the IN service;
• and
• an intra-group call processing module, adapted to trigger a service control point (SCP) that executes the IN service by using a message that carries a discount charging prefix if the call request is for an intra-group call, receive an IN service trigger response from the SCP, and trigger the AS that executes the IP Centrex service according to the record of connecting the call to the AS.

A mobile communication system, comprising:

• an application server (AS) adapted to provide checking result indicating whether a call request is for an intra-group call;
• and
• a Mobile Switch Center (MSC) comprising:
• a receiver, adapted to receive a call request initiated by a user;
• a determining module, adapted to determine whether the user subscribes to an IP Centrex service and an intelligent network (IN) service according to obtained subscription information of the user;
• a checking module, adapted to check with an application server (AS) whether a call request is for an intra-group call when the determining module determines that the user subscribes to the IP Centrex service and the IN service;
• a storing module adapted to store a record of connecting the call to the AS when the determining module determines that the user subscribes to the IP Centrex service and the IN service;
• and
• an intra-group call processing module, adapted to trigger a service control point (SCP) that executes the IN service by using a message that carries a discount charging prefix if the call request is for an intra-group call, receive and IN service trigger response from the SCP, and trigger the AS that executes the IP Centrex service according to the record of connecting the call to the AS.