Well, it won't be as easy as it would be with SPM 'cause you won't be able to determine what numbers are available.
Let's just say you want to swap Extension A with Extension B.
You CANNOT change extension A to Extension B, without using a "HOLDING NUMBER" if extension B is already in use.
Basically, you would change Extension B to a "HOLDING NUMBER", such as 71xx and then change Extension a to what Extension B started as. Then you can change Extension B to Extension A's Number.
However, if you don't know what's available, it can be difficult to just "GUESS" what you can use.
If you can't guess, you will probably need outside help to get it done.
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