Extracting Call details from GSM modem

Hello There.

Can anyone solve the following problem?


Consider following scenario:

There are three persons, named A, B and C.

A's mobile no is M, B's no is N and C's no is P.

The C is GSM/GPRS modem and is connected to pc/Server .

B has forwarded all its voice calls to C.

Now, A (call originator) calls to B (call forwarder), call gets
forwarded to C (call terminated).

Here, C is connected to pc/server, how do I extract call details using
at commands?

I want following details to be extracted.
1. the main call originating number (ie, from where call originated,
not from where is forwarded, ie A's no what is M) 2. the number from
where call got forwarde (ie, from where call forwarded from, ie, B's
no N )

So, can any one tell me how do i achive that using AT commands or any other way?



Regards
 - Rajendra Pondel