Never done it before, but I would imagine that you need to look in the Zone Based dialing and set the site A translation to 4100 and the site B to 4200. Not too sure how to implement though.
my choice for that is usually tennant service.. only change is ten to rdb and ten to att.. each tennant can have a att, or share.. you usually allow ten to ten, which makes it more flexable then multi customer
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