Patent ID: 8412240

Claim:
A Short Message Service Center (SMS-C) comprising: a session database configured to store session information for a mobile device that has established a data session over a broadband data network; an interface configured to receive a Mobile Terminated (MT) SMS message destined for the mobile device; and a control system configured to store the MT SMS message for delivery, to identify a routing address for the mobile device over the broadband data network based on the session information stored in the session database, and to forward the MT SMS message through the interface to the mobile device over the broadband data network based on the routing address; wherein the control system is further configured to receive an error message from the broadband data network through the interface indicating that the MT SMS message cannot be delivered to the mobile device, to identify another SMS-C for a voice network that is serving the mobile device in response to the error message, and to forward the MT SMS message to the other SMS-C through the interface.