SS7 ISUP to SIP based call signaling conversion gateway for wireless VolP E911
View Patent ↗An SS7-based call protocol conversion gateway that translates between circuit-switched SS7 protocols and session initiation protocol (SIP) oriented protocol, allowing an E911 call initiated over a switched network to be routed by a VoIP network. The SS7-based call protocol conversion gateway provides a PSAP with MSAG quality (street address) information about a VoIP dual mode phone user without the need for a wireless carrier to invest in building out an entire VoIP core. Thus, wireless carriers may continue signaling the way they are today, i.e., using the J-STD-036 standard for CDMA and GSM in North America, yet see benefits of a VoIP network core, i.e., provision of MSAG quality location data to a PSAP.
1. An ANSI-41 J STD-036 to SIP call protocol conversion gateway server, comprising:
a physical receiver module configured to receive a wireless call using signaling system number 7 (SS7) ANSI-41 J-STD-036 transaction capability application part (TCAP)-based call signaling;
an SS7 based ISUP to SIP protocol conversion gateway adapted to convert said SS7 ANSI-41 J-STD-036 transaction capability application part (TCAP)-based call signaling into session initiation protocol (SIP)-based call signaling; and
a physical transmitter module adapted to transmit said SS7 ANSI-41 J-STD-036 transaction capability application part (TCAP)-to-SIP converted call signaling associated with said VoIP 911 originating call to a physical voice over Internet protocol (VoIP) server for routing to a desired recipient VoIP device;
wherein said receiver receives routing instruction from said Voice over Internet protocol (VoIP) server, said routing instruction being assigned based upon a location retrieved from a physical location information service/subscriber line database (LIS/SLDB).
2. The ANSI-41 J STD-036 to SIP call protocol conversion gateway server according to claim 1 , wherein:
said SS7 ANSI-41 J-STD-036 transaction capability application part (TCAP)-based call signaling relates to a wireless 911 call.
3. The ANSI-41 J STD-036 to SIP call protocol conversion gateway server according to claim 2 , wherein:
said SS7 ANSI-41 J-STD-036 transaction capability application part (TCAP)-based call signaling relates to a VoIP wireless 911 call.
4. The ANSI-41 J STD-036 to SIP call protocol conversion gateway server according to claim 1 , wherein:
said SS7 ANSI-41 J-STD-036 transaction capability application part (TCAP)-based call signaling relates to a VoIP wireless call made via a local area network.
5. The ANSI-41 J STD-036 to SIP call protocol conversion gateway server according to claim 4 , wherein:
said local area network is a wireless fidelity (WiFi) network.
6. A method of converting a wireless call, passed over an SS7 ANSI-41 J-STD-036 network, into a VoIP call, comprising:
receiving a wireless call including signaling system number 7 (SS7) ANSI-41 J-STD-036 transaction capability application part (TCAP)-based call signaling;
converting said SS7 ANSI-41 J-STD-036 TCAP-based call signaling into session initiation protocol (SIP) call signaling;
transmitting said SS7 ANSI-41 J-STD-036 transaction capability application part (TCAP)-to-SIP converted call signaling associated with said wireless call to a physical Voice over Internet Protocol (VoIP) server for routing to a desired physical recipient VoIP device; and
receiving routing instruction from said physical VoIP server, said routing instruction being assigned based upon a location retrieved from a physical location information service/subscriber line database (LIS/SLDB).
7. The method of converting a wireless call, passed over an SS7 ANSI-41 J-STD-036 network, into a VoIP call, according to claim 6 , wherein:
said physical recipient VoIP device is a wireless phone.
8. The method of converting a wireless call, passed over an SS7 ANSI-41 J-STD-036 network, into a VoIP call, according to claim 6 , wherein:
said physical recipient VoIP device is a dual mode phone.
9. The method of converting a wireless call, passed over an SS7 ANSI-41 J-STD-036 network, into a VoIP call, according to claim 8 , wherein:
said dual mode phone has a first mode operable in a cellular phone network, and a second mode operable in a wireless fidelity (WiFi) network.
10. The method of converting a wireless call, passed over an SS7 ANSI-41 J-STD-036 network, into a VoIP call, according to claim 6 , wherein:
said SIP converted call signaling includes a SIP INVITE command.
11. The method of converting a wireless call, passed over an SS7 ANSI-41 J-STD-036 network, into a VoIP call, according to claim 6 , wherein said SS7 ANSI-41 J-STD-036 TCAP-based call signaling comprises:
a TCAP OriginationRequest (ORREQ) message.
12. The method of converting a wireless call, passed over an SS7 ANSI-41 J-STD-036 network, into a VoIP call, according to claim 11 , wherein:
said ORREQ message contains a calling party's number (CgPN) and a called party's number.
13. A method of converting a wireless call passed over an ANSI-41 J STD-036 network, into a VoIP call, comprising:
receiving a wireless call from a wireless phone;
routing said wireless call using signaling system number 7 (SS7) ANSI-41 J-STD-036 transaction capability application part (TCAP)-based call signaling;
converting said SS7 ANSI-41 J-STD-036 TCAP-based call signaling into session initiation protocol (SIP) call signaling;
passing said wireless call using SIP call signaling to a physical Voice over Internet Protocol (VoIP) server; and
receiving routing instruction from a physical VoIP server, said routing instruction being assigned based upon a location retrieved from a physical location information service/subscriber line database (LIS/SLDB).