[Asterisk-Dev] Active call information

[Venkat Venkataraju]

Hi All


I want to extract information like called number and the channel 
whenever a call is being made. This information will be sent to another 
process to compute duration of the active calls.

What file should i teak so that i can get this information out of 
asterisk? or is there any API which can be used to extract this information?

Thanks
Venkat