Methods, systems, and computer program products for routing a call from a 2g network to a dual mode 2g/session initiation protocol (sip) device

A system for routing a call from a 2G network to a dual mode 2G/SIP device, the system comprising:

• a mobility location database for associating at least one destination subscriber identifier with SIP mobility location information for 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 mobility location information for delivering a call to a dual mode 2G/SIP device roaming in a SIP-based network, wherein the mobility location information query message includes the destination subscriber identifier associated with the dual mode 2G/SIP device, and determining the SIP mobility location information based on the destination subscriber identifier by querying the mobility location database using the subscriber identifier.

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

• a mobility location database for storing at least one destination subscriber identifier and at least one associated SIP mobility location information;
• and
• a mobility location function for subscribing to a SIP network node for SIP mobility location information associated with a dual mode 2G/SIP device roaming in a SIP-based network, and for receiving a registration event message including at least a SIP mobility location information associated with the SIP network node and a destination subscriber identifier associated with the dual mode 2G/SIP device, and for populating the mobility location database with at least the SIP mobility location information and the destination subscriber identifier.