Avaya routing question

[madur]

Hello,

Here is my configuration:

Site A : LAN1 : 10.10.0.254
LAN2 : 10.0.0.4 / 255.255.254.0

Site B : LAN1 : 10.10.1.254
LAN2 : 10.0.64.4 / 255.255.252.0

Site C : LAN1 : 10.10.2.254
LAN2 : 10.0.80.4 / 255.255.248.0

I have a Windows Terminal Server with the IP : 10.0.0.16 (which belong to the Site A network)
The TAPI driver is installed and Phone manager too on the TSE server.
A CTI is installed (linked to use the TAPI driver)

My question how to route calls to the right IPBX depending of which user is connected to the TSE server ?

Exemple :
For Roger who is on site B and connected to the TSE server on Site A i would like to use the IPBX on site B for all calls. If Jenny is connected from site C, il would like to use IPBX on site C.

Is there a way to achieve that ?

Thanks