martinyoung

To keep four digit dialing with multiple sites having overlapping DIDs, you really only have one option and that is really a seven digit dial plan. If you have AAR available at each site you can use that.

Assign each site a unique three digit AAR number and let everyone know what goes where. Here are a couple examples, to reach John in the New York office dial 120-3456 or to get Mary in Houston dial 121-3456.

You will assign the AAR codes in AAR Analysis and route the call to a route pattern which will contain the rest of the dialing info. Lets go back to the first example, 120-3456. In AAR you program any calls starting with 120 to go to route pattern 1. Route pattern 1 directs the call out trunk group 20. Now you deal with the rest of the programming. If trunk group 20 is a tie line to that office from your switch, just delete three digits and 3456 will go out that trunk group to John's phone.

On the other hand if trunk group 20 is a PSTN trunk then you delete three digits and insert 1212567 in front of the call to station 3456 and you will outpulse 12125673456 over the PSTN network to John's phone.

This will need to be setup in each PBX using whatever trunks you have available and AAR must be available in customer options.

__________________
Marty
Retired Avaya DSIC tech