SS7 MAP/Lg+ to SIP based call signaling conversion gateway for wireless VoIP E911
First Claim
1. A call protocol conversion gateway between an SS7 MAP/Lg+ based communication network and a physical voice over Internet (VoIP) positioning center, comprising:
- a first physical interface adapted to receive signaling system number 7 (SS7) MAP/Lg+-based call signaling;
a software module adapted to convert said SS7 MAP/Lg+ based call signaling into session initiation protocol (SIP)-based call signaling; and
a second physical interface adapted to pass said SS7 MAP/Lg+-to-SIP converted SIP call signaling to said physical voice over Internet (VoIP) positioning center;
wherein the gateway receives a routing instruction from a VoIP positioning center (VPC), including an emergency services query key (ESQK) and a trunk select code; and
translates said ESQK into an emergency services routing key (ESRK).
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Accused Products
Abstract
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.
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Citations
18 Claims
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1. A call protocol conversion gateway between an SS7 MAP/Lg+ based communication network and a physical voice over Internet (VoIP) positioning center, comprising:
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a first physical interface adapted to receive signaling system number 7 (SS7) MAP/Lg+-based call signaling; a software module adapted to convert said SS7 MAP/Lg+ based call signaling into session initiation protocol (SIP)-based call signaling; and a second physical interface adapted to pass said SS7 MAP/Lg+-to-SIP converted SIP call signaling to said physical voice over Internet (VoIP) positioning center; wherein the gateway receives a routing instruction from a VoIP positioning center (VPC), including an emergency services query key (ESQK) and a trunk select code; and
translates said ESQK into an emergency services routing key (ESRK). - View Dependent Claims (2, 3, 4, 5)
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6. A method of converting a VoIP call, passed over a switched telephone network, into a VoIP call for presentation to a public safety access point (PSAP), comprising:
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receiving, at an intermediate call protocol conversion gateway between an SS7 MAP/Lg+ based communication network and a physical voice over Internet (VoIP) positioning center, a voice over Internet protocol (VoIP) call from a VoIP phone; converting, at said intermediate call protocol conversion gateway, SS7 MAP/Lg+ based call signaling into session initiation protocol (SIP) call signaling; and passing, from said intermediate call protocol conversion gateway, said SS7 MAP/Lg+-to-SIP converted SIP call signaling to said voice over Internet (VoIP) positioning center; receiving a routing instruction from a VoIP positioning center (VPC), including an emergency services query key (ESQK) and a trunk select code; and translating said ESQK into an emergency services routing key (ESRK). - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method of converting a VoIP call, passed over a switched telephone network, into a VoIP call for presentation to a public safety access point (PSAP), comprising:
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receiving, at an intermediate call protocol conversion gateway between an SS7 MAP/Lg+ based communication network and a physical voice over Internet (VoIP) positioning center, a voice over Internet protocol (VoIP) call from a VoIP phone; converting, at said intermediate call protocol conversion gateway, SS7 MAP/Lg+ based call signaling into session initiation protocol (SIP) call signaling; passing, from said intermediate call protocol conversion gateway, said SIP call signaling to said voice over Internet (VoIP) positioning center; receiving a routing instruction from a VoIP positioning center (VPC), including an emergency services query key (ESQK) and a trunk select code; and translating said ESQK into an emergency services routing key (ESRK). - View Dependent Claims (14, 15)
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16. A method for converting a VoIP call, passed over a switched telephone network, into a VoIP call for presentation to a public safety access point (PSAP), comprising:
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receiving a voice over Internet protocol (VoIP) call from a VoIP phone via a local area network; routing said VoIP call using signaling system number 7 (SS7) MAP/Lg+ based call signaling; converting said SS7 MAP/Lq+ based call signaling into session initiation protocol (SIP) call signaling; passing said SIP call signaling to a voice over Internet (VoIP) positioning center; receiving a routing instruction from a VoIP positioning center (VPC), including an emergency services query key (ESQK) and a trunk select code; translating said ESQK into an emergency services routing key (ESRK). - View Dependent Claims (17, 18)
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Specification