Queue Callback phone number format

[DChazhiyill]

We are US based call-center and want to implement callback option for callers when they are waiting in the Queue. We notice that ZCC uses 11-digits 1xxxyyyzzzz when accepting caller's phone number for the purposes of callback.

Is there a way to use only the 10-digits (excluding 1)? Since it could be confusing when callers want the callback on a different number.