Method and system for providing enhanced caller identification information for subscribers that interface via private trunk groups

A system for processing a call from a calling party at a calling communication station to a called party at a called communication station, the called communication station being associated with private facilities, the system comprising:

• a service switching point (SSP) operative to encounter a Trunk_Group Trigger associated with the called communication station and identify the call as being associated with the private facilities and, in response, to generate a query message;
• a service control point (SCP) coupled with the SSP and operative to receive the query message and determine whether standard calling party identification information may be provided for the called communication station and if not, to initiate a forward call message to cause the SSP to initiate a new call;
• and
• a service node coupled with the SSP to complete the new call to the calling communication station to transmit a request for audible caller identification information to the calling communication station.

A Service Switching Point (SSP) for processing calls, the SSP comprising:

• first computer program code to detect a call from a calling communication station intended for a called communication station associated with the SSP over a private trunk group, the first computer program code being configured to receive with the call a directory number of the called communication station and to encounter a Trunk_Group Trigger associated with the directory number, and wherein the first computer program code is further configured to generate an indication that the called communication station is associated with the private trunk group in response to the Trunk_Group Trigger;
• second computer program code responsive to the indication that the called communication station is associated with the private trunk group to generate a call processing query;
• third computer program code responsive to a message received in response to the call processing query to initiate a new call to the calling communication station to request audible caller identification information;
• and
• a processing device controlling the SSP.