Try this:
Assign a Send-Calls button on the phone.
Pick an unused coverage path.
Set all the options (Active,Busy,etc) except Send Calls to No, set Send-Calls to Yes. (Both inside and Outside calls)
On coverage Point1, enter the remote coverage number (Ex:r71), coverage Point 2 set to voice-mail (Ex:h99)
Set # of rings to 1
Set a second coverage path in [Next Path Number].
(You can use a common existing one for this 2nd path-if it doesn't use send-calls (in and out set to No), with normal voice-mail endpoint Ex:h99)
Now, when they want coverage to remote--they push the send-calls button and turn off send-calls for normal coverage.
The only drawback is they have to be there to activate-deactivate the button--unless they call a co-worker.
Voila! Viva Tek-Tips!
Mark