Methods, systems, and computer program products for routing a short message service (sms) message from a 2g network to a session initiation protocol (sip)-based network

A system for routing a short message service (SMS) message from a 2G network to a dual mode 2G/session initiation protocol (SIP) device roaming in a SIP-based network, the system comprising:

• a mobility location database for associating at least one subscriber identifier with SIP mobility location information identifying a location of a dual mode 2G/SIP device roaming in a SIP-based network;
• and
• a mobility location function for receiving a 2G mobility location information query message requesting a delivery address for delivering an SMS message that includes a destination subscriber identifier and determining SIP mobility location information based on the destination subscriber identifier by querying the mobility location database using the destination subscriber identifier.

A system for provisioning a mobility location database, the system comprising:

• a mobility location database for storing session initiation protocol (SIP) mobility location information, wherein the SIP mobility location information includes a destination subscriber identifier associated with the dual mode 2G/SIP device roaming in a SIP-based network and at least one network node number (NNN) identifier associated with at least one SIP network node servicing the dual mode 2G/SIP device;
• and
• a mobility location function for subscribing to the at least one SIP network node to receive the SIP mobility location information when the dual mode 2G/SIP device roams in the SIP-based network and is served by the at least one SIP network node, for receiving a registration event message including the SIP mobility location information, and for provisioning the mobility location database with the SIP mobility location information which is used to route a short message service (SMS) message to the dual mode 2G/SIP device in the SIP-based network.