I have a 2400ICS with lots of stations and all the trunking. Different RSC phones can call local with code or without code, and long distance calls with code always. Anyways, it's all working fine.

All calls going out from the 2000IPS go into the 2400ICS to stations or go out on PRI trunks of the 2400ICS to telco.

Can I implement this auth code system for the 2000IPS? So if a station from the IPS makes a call and it arrives to the 2400 and is intended to be a local or LD call, some RSC gets associated with that call and the ICS asks for a code or doesn't, depending on the associated RSC?

Currently all calls can go out from the IPS via the ICS without entering any auth code...