Caller identification displayed on a personal computer

1. An apparatus for providing a caller ID in a mobile communication system, comprising:

a private exchange system, which is connected to a public switched telephone network (PSTN), the private exchange system verifying that a caller ID service has been requested from a client after receipt of a call to the client;

a server system, which is connected to the private exchange system for receiving, storing, and managing caller ID information; and

a client device, which is connected to the private exchange system or server system for receiving the caller ID information, the client device comprising a terminal and a client computer including an application program;

wherein the private exchange system comprises an interface unit which, is in charge of transmission/receipt of information with the server system or protocol; and a database management system (DBMS), which is connected to the interface unit for managing caller ID data,

wherein the server system comprises a message handler, which is in charge of information transmission/receipt or protocol between a server PC interface in the private exchange system and decodes the received caller ID information, a database that stores the caller ID information, and an application server, which supports programs run by the client device that allow, a client to receive the caller ID information, the application server sending the caller ID information to the client computer application program when the client is logged in to the client computer allowing the client to output or store the caller ID information, if the caller ID service was requested from the client, and

wherein the private exchange system rings the terminal and outputs a caller ID on the terminal.

2. The apparatus of claim 1 , wherein the private exchange system comprises:

a trunk subscriber adapter coupled to the external exchange system;

a call processor coupled to the trunk subscriber adapter;

a first database coupled to the call processor;

a server interface coupled to the first database;

a client adapter coupled to the call processor;

an internal subscriber coupled to the call processor; and

a system adapter unit coupled to the trunk subscriber adapter.

3. The apparatus of claim 1 , wherein the server comprises:

a message handler coupled to the server interface;

an application server coupled to the message handler;

a second database coupled to the message handler;

a common gate interface coupled to the second database; and

a web server coupled to the common gate interface.

4. The apparatus of claim 1 , further comprising an operation maintenance system.

5. A method for providing a caller ID in a mobile communication system, the method comprising:

a first process, wherein a call made by a calling party is received at a private exchange system through a public switched telephone network (PSTN);

a second process, wherein incoming information associated with the call is analyzed in a call processor to verify whether a client associated with the call requested a caller ID service;

a third process, wherein a caller ID call message is decoded by a call processor and stored in a database of a server system; and

a fourth process, wherein the stored call message is outputted to the client,

wherein the caller ID service further comprises;

allowing an external or internal subscriber to request a server PC interface in the private exchange system for the caller ID service;

transporting received relevant information associated with the caller ID service from a message handler to an application server of the server system;

ringing a terminal of the client and outputting the caller ID on the terminal; and

transmitting the received relevant information from the application server to a client PC application program, allowing a client PC of the client to output or store the caller ID.