The manual says two interesting things:

1) Do not assign any hunt group lines to individual telephones. If any of the phones have the line assigned, remove the line from the phone before assigning it to the hunt group.

2) If the overflow phone is a hunt group phone, the call is treated as a new call, and goes to the bottom of the queue.

There is no consequence indicated for the first condition, so it's hard to know what happens in that case.

The second condition seems to indicate that even if overflow is programmed, the call will never get out of the queue, but rather simply be reloaded to the queue each time it times out to overflow. That would seem to indicate that you can never send a hunt group call to the voice mail of a member phone.

Any comments on that ?