One user has 3 different numbers to reach that phone (one is the main office number with an extension, the other 2 ring direct).

These phones have 2 line buttons. I would like this user to be able to choose from 3 different Caller-ID numbers when placing a call. I already do this with 2 numbers by using the 2 different line buttons, but I'm trying to figure out a way to choose a 3rd number when placing a call.

Any ideas will be appreciated.

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Steve