martinyoung

A six digit dial plan and using AAR codes to route the calls are not the same thing. You still have a four digit dial plan. To go back to my example, you could have station 3456 in your switch and several others. The only one you can reach by dialing 3456 is the person in your switch. To get to any other switch you need to prefice the station number with an AAR code so the PBX knows it is not in your system.

You need to start planning now so that you can get them all integrated. If every company comes in with a four digit or less dial plan put together a spreadsheet assigning a unique two digit number to each location now. And by a unique two digit number I mean each PBX will have a different prefix. If the stations in your system are 3xxx and the stations in Houston are also 3xxx, your PBX would be 20 and Houston would be 21. So when the six digit dial plan is implemented your stations are 203xxx and houston is 213xxx.

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Marty
Retired Avaya DSIC tech