A method and system are provided for updating call-specific data in a database associated with operation of a wireless network. The seals have a coefficient of thermal expansion in the range of 70-130\xd710\u22127\xb0 C. The method can further include transmitting identification acknowledgement signal from the other power supply unit to the control module in response to the first corresponding identification command. Some embodiments provides a method of user equipment registration with a closed subscriber group where a network controller receives a registration request for a UE from an access point including an initial non-access stratum message from the user equipment and a CSG identifier.