Patent ID: 7437168

Claim:
In an IP-based cellular wireless communication system, a central facility comprising: a receiver arrangement for receiving a call for a cellular phone device, the receiver arrangement further being arranged to receive an IP message through a radio access network, wherein the IP message identifies the cellular phone device and provides information that the cellular phone device has entered an area of restricted service access; a processor arrangement for determining whether the cellular phone device is in said area of restricted service access, wherein determining whether the cellular phone device is in the area of restricted service access includes determining whether said information that the cellular phone device has entered the area of restricted service access has been relayed in the IP message through a radio access network, the processor arrangement being arranged to forward the call to the cellular phone device when it is determined that the cellular phone device is not in the area of restricted service access, the processor arrangement further being arranged to perform special quiet zone processing when it is determined the cellular phone device is in the area of restricted service access; and a sending arrangement for sending a hush command to the cellular phone device upon receiving said IP message.