The present invention provides a method and apparatus for restricting call terminations
for a roaming mobile unit. A serving MSC, which is an MSC providing call processing
a mobile unit that is not the home MSC of the mobile unit, sends a registration
notification request to the home location register (HLR). The HLR retrieves the
termination access code parameter from the HLR and sends it to the serving MSC.
The termination access code parameter includes a value that indicates if the mobile
unit is allowed to roamer port calls. The parameter is stored at a VLR associated
with the serving MSC. When a call request comes in to the serving MSC and requests
a roamer port call with the mobile unit, the serving MSC checks the value of the
termination restriction code to determine if it should terminate, or complete,
the call.
