PROVIDING VOICE CALL CONTINUITY

1 . A method, comprising:

receiving a request to handover a call session from a radio access network to an internet protocol connectivity access network (IP-CAN); and

handing over the call session to the IP-CAN independent of an Internet Protocol Multimedia Subsystem (IMS).

2 . The method of claim 1 , wherein handing over the call session comprises:

presenting a network node in the IP-CAN as a cellular radio controller (RC) to a cellular core network; and

handing over the call session to the IP-CAN using the network node.

3 . The method of claim 2 , wherein handing over the call session comprises transmitting compatible information to the cellular core network using the network node.

4 . The method of claim 3 , wherein the compatible information comprises at least one of: a handover request message, a handover request acknowledgment message, a handover detect message, and a handover complete message.

5 . The method of claim 1 , wherein handing over the call session comprises:

receiving a session initiation protocol (SIP) request for registration over the IP-CAN; and

transmitting an acknowledgment in response to the register request in connection with registration.

6 . The method of claim 5 , wherein the acknowledgment comprises a cellular identifier used by the mobile switching center.

7 . The method of claim 1 , wherein handing over the call session comprises:

receiving a SIP invite request from the mobile device over the IP-CAN; and

transmitting an acknowledgement in response to the invite request.

8 . The method of claim 1 , further comprising translating between a SIP message and a cellular message.

9 . The method of claim 1 , wherein handing over the call session comprises terminating a portion of the call session through the radio access network.

10 . A method, comprising:

generating a measurement report indicating signal strength of a wireless connection to a radio access network is weak independent of the actual signal strength; and

transmitting the measurement report to the radio access network to initiate a handover to a IP-CAN.

11 . The method of claim 10 , wherein the measurement report indicates the IP-CAN as the appropriate handover candidate independent of signal strength of the IP-CAN.

12 . A system for a communications network, comprising:

a data store; and

a processor communicatively coupled to the data store, the processor operable to:

receive a request to handover a call session from a radio access network to a IP-CAN; and

hand over the call session to the IP-CAN independent of an Internet Protocol Multimedia Subsystem (IMS).

13 . The system of claim 12 , wherein the processor is further operable to:

present a network node in the IP-CAN as a cellular radio controller (RC) to a cellular core network; and

hand over the call session to the IP-CAN using the network node.

14 . The system of claim 13 , wherein the processor is further operable to transmit compatible information to the cellular core network using the network node.

15 . The system of claim 14 , wherein the compatible information comprises at least one of: a handover request message, a handover request acknowledgment message, a handover detect message, and a handover complete message.

16 . The system of claim 12 , wherein the processor is further operable to:

receive a session initiation protocol (SIP) request for registration over the IP-CAN; and

transmit an acknowledgment in response to the register request in connection with registration.

17 . The system of claim 16 , wherein the acknowledgment comprises a cellular identifier used by the mobile switching center.

18 . The system of claim 12 , wherein the processor is further operable to:

receive a SIP invite request from the mobile device over the IP-CAN; and

transmit an acknowledgement in response to the invite request.

19 . The system of claim 12 , wherein the processor is further operable to translate between a SIP message and a cellular message.

20 . The system of claim 12 , wherein the processor is further operable to terminate a portion of the call session through the radio access network.

21 . A system, comprising:

a data store; and

a processor communicatively coupled to the data store operable to:

generate a measurement report indicating signal strength of a wireless connection to a radio access network is weak independent of the actual signal strength; and

transmit the measurement report to the radio access network to initiate a handover to an IP-CAN.

22 . The system of claim 21 , wherein the measurement report indicates the IP-CAN as the appropriate handover candidate independent of signal strength of the IP-CAN.