Method and system of providing second generation (2G) voice services over Internet protocol

1. A system to provide Second Generation (2G) voice services over Internet Protocol, the system comprising:

a voice gateway (VGW) comprising:

a 2G stack to communicate control plane information and user plane information with a 2G User Terminal (UT) via a circuit-switched network without modifications to the 2G-UT,

an Iu-CS IP stack, and

a relay to map the control plane information between the 2G stack and the Iu-CS IP stack, and vice-versa;

a Mobile Switching Center (MSC), connected to the VGW via the Iu-CS IP stack, to manage and establish the voice services between the 2G-UT and a Public Switched Telephone Network (PSTN) based on the mapped control plane information; and

a Media Gateway (MGW) connected to the VGW via the Iu-CS IP stack, wherein the MGW communicates the user plane information between the 2G-UT and the PSTN after the MSC has established voice services.

2. The system of claim 1 , wherein the 2G-UT and the VGW communicate over a satellite link.

3. The system of claim 1 , wherein the 2G-UT comprises a THURAYA UT.

4. The system of claim 1 , wherein the MSC communicates with the MGW to establish a bearer between the VGW and the PSTN.

5. The system of claim 1 , wherein the relay conveys a Base Station System Application Part (BSSAP) message of the 2G stack to a Radio Access Network Application Part (RANAP) message of the Iu-CS IP stack.

6. The system of claim 1 , wherein the VGW further comprises a vocoder to convert voice from a 2G-UT vocoder format to a Pulse Code Modulation (PCM) 64 k format.

7. The system of claim 1 , wherein the VGW further comprises a vocoder to convert voice from a PSTN vocoder format to a 2G-UT vocoder format comprising an Advanced Multiband Excitation (AMBE) format.

8. A voice gateway (VGW) to provide voice services to a 2G terminal over IP comprising:

a 2G stack to communicate control plane information and user plane information with a 2G User Terminal (UT) via a circuit-switched network without modifications to the 2G-UT;

an Iu-CS IP stack to connect the VGW with a Mobile Switching Center (MSC) that manages and establishes the voice services between the 2G-UT and a Public Switched Telephone Network (PSTN), and to connect the VGW with a Media Gateway (MGW), wherein the MGW communicates the user plane information between the 2G-UT and the PSTN after the MSC has established the voice services; and

a relay to map the control plane information between the 2G stack and the Iu-CS IP stack, and vice-versa,

wherein the MSC uses the mapped control plane information, and wherein the MGW communicates the user plane information between the 2G-UT and the PSTN after the MSC has established voice services.

9. The VGW of claim 8 , wherein the 2G-UT and the VGW communicate over a satellite link.

10. The VGW of claim 8 , wherein the 2G-UT comprises a THURAYA UT.

11. The VGW of claim 8 , wherein the MSC communicates with the MGW to establish a bearer between the VGW and the PSTN.

12. The VGW of claim 8 , wherein the relay maps a Base Station System Application Part (BSSAP) of the 2G stack to a Radio Access Network Application Part (RANAP) message of the Iu-CS IP stack.

13. The VGW of claim 8 , wherein the VGW further comprises a vocoder to convert voice from a 2G-UT vocoder format to a Pulse Code Modulation (PCM) 64 k format.

14. The VGW of claim 8 , wherein the VGW further comprises a vocoder to convert voice from a PSTN vocoder format to a 2G-UT vocoder format comprising an Advanced Multiband Excitation (AMBE) format.

15. A non-transient computer-readable storage medium having instructions embodied thereon, the instructions being executable by one or more processors to perform a method for providing voice services over Internet Protocol to a Second Generation (2G) User Terminal (UT), the method comprising:

communicating, via a 2G stack, control plane information and user plane information with the 2G-UT via a circuit-switched network without modifications to the 2G-UT;

mapping the control plane information between the 2G-UT and a Mobile Switching Center (MSC), and vice-versa;

managing, via an Interface-Circuit Switched (Iu-CS) Internet Protocol (IP) stack, the voice services facilitated by the MSC between the 2G-UT and a Public Switched Telephone Network (PSTN) based on the mapped control plane information over a packet-switched network;

establishing, via the Iu-CS stack, a bearer to transport the user plane information between the 2G-UT and the PSTN;

connecting the VGW with a Media Gateway (MGW), wherein the MGW communicates the user plane information between the 2G-UT and the PSTN after the establishing; and

transporting the user plane information between the 2G-UT and the PSTN after the establishing over the packet-switched network.