asterisk users - Aug 2005 - Question about SIP connection and disconnection events on Asterisk

Hi all:

I have question about connection/disconnection information from Asterisk. I want
to do some call monitoring selectively, that means I have a list of call cording
request, I'd like to send monitoring command to Asterisk when the call
connects to a specific agent who is under recording request, I need to have the
connection information, similarly I need to notify Asterisk to stop recording
when my application gets the disconnect information. Does anyone know how to get
those information? another usage of the information is for screen pop, which we
need to know related call information such as caller id, and where is call
connected to.

Many thanks,

Tielin