How to assigned a T1 port to an specific extension
I have configured the PBX G3r from AVAYA to the Asterisk box through a T1 link, in the PBX side I dont have a trunk group, I use each one of the channel ports from the T1 as an station, this means that 1 port is know in the PBX as an extension, example: extension 3000 is the channel 1 from the 23 channels in the T1, 3001 is the channel 2 from the 23 channels in the T1....
So when someone call from one extension in the PBX example 4000 to the extension 3000 the call goes to the asterisk box, so the question here is: how can I assigned each one of the port from the T1 to an especific sip extension in the asterisk box, example from the full path call from an extension in the PBX to an specific extension in the asterisk box:
AVAYA extension that is calling ---> AVAYA DS1FD extension(T1 port) ---> Specific Sip extension
4000 (From AVAYA PBX) ----> 3000(Virtual Extension Port 1 T1 link) ---> 2000 (Sip extension in the Asterisk)
I have all configurat