Patent ID: 7720056

Claim:
A messaging center connectable to a first communication network, and a second communication network, the messaging center arranged to receive a message having a destination address based on a first communication protocol for delivery to a wireless access terminal, the messaging center having: a storage device storing a mapping between a first destination address corresponding to a first communication protocol destination address of the wireless access terminal in the first communication network, a mobile static identifier including a user id and a domain, and a second communication protocol destination address corresponding to a destination address of the wireless access terminal in the second communication network, the mapping between the first communication protocol destination address and the second communication protocol destination address being based on a correspondence between the first communication protocol destination address and the mobile static identifier; and a central processing unit in communication with the storage device, the central processing unit: evaluating the mapping to determine the destination address of the wireless access terminal in the second communication network; and transmitting the message to the wireless access terminal using the second communication network.