Method for providing call-connected party's information in private exchange network

An apparatus, comprising:

• a server providing computer telephony integration, said server including a database including caller information, the caller information including a corresponding telephone number;
• a private exchange system connected to said server, said private exchange system transmitting a caller information request message including a caller telephone number to said server, said server comparing the transmitted telephone number with the caller information stored in the database of said server, said server transmitting a caller information message to said private exchange system when the telephone number in the caller information relates to a telephone number in the database;
• and
• a terminal receiving and displaying the caller information, said terminal receiving the caller information when the caller information message is received by said private exchange system.

A method, comprising:

• generating an information retrieval request message having a requested telephone number in a private exchange system, and allowing said private exchange system to transmit the information retrieval request message to a server when there is an information retrieval request for a certain telephone number in said private exchange system;
• determining whether there is call information in a database corresponding with the telephone number contained in the information retrieval request message in said server, generating a database checking result message, and transmitting the database checking result message to said private exchange system upon receiving the information retrieval request message from said private exchange system;
• and
• allowing said private exchange system to transmit the information to a corresponding terminal upon receiving information corresponding with the telephone number from said server.