UDP calls do not prompt the caller for an authorization code because UDP calls are viewed as internal calls to the caller. If the caller does not have the required facilities restriction level (FRL) to route a UDP call to another Communication Manager server, the call fails and the caller receives Intercept Treatment.

If you use UDP to place calls to public network numbers, you can use the first digit that is usually reserved for the ARS Feature Access Code for other purposes. For example, in North America, this would free up the first digit 9. If you still want these UDP-dialed calls to be prompted for an Authorization Code, use ARS to route these UDP numbers and enable the parameter UDP-ARS Calls Considered Offnet on the Dial Plan Parameters screen.