Ss7 ansi-40 to sip based call signaling conversion gateway for wireless voip e911
AssigneeTeleCommunication Systems, Inc.
InventorDON MITCHELL
Life of this patent
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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.
Claims21
(canceled)
A method comprising:
- converting, by a conversion gateway, a Voice Over Internet Protocol (VoIP) call into an Signaling System Number 7 (SS7) based call;
- transmitting, from the conversion gateway via Session Initiation Protocol (SIP) call signaling associated with the VoIP call, a request to a VoIP positioning center for routing information associated with the VoIP call;
- receiving, at the conversion gateway, routing information associated with the VoIP call;
- and
- translating, by the conversion gateway, the routing information into wireless E911 routing elements.
A gateway comprising one or more computing devices, the gateway being configured to:
- convert a Voice Over Internet Protocol (VoIP) call into a Signaling System Number 7 (SS7) based call;
- transmit, via Session Initiation Protocol (SIP) call signaling associated with the VoIP call, a request to a VoIP positioning center for routing information associated with the VoIP call;
- receive routing information associated with the VoIP call, wherein the routing information includes an emergency services query key (ESQK) and an emergency services routing number (ESRN) for the VoIP call;
- and
- translate the routing information into wireless E911 routing elements.
A system comprising:
- a mobile switching center (MSC) configured to receive a Voice Over Internet Protocol (VoIP) call from a mobile device;
- and
- a conversion gateway configured to:
- convert the VoIP call into a Signaling System Number 7 (SS7) based call;
- transmit, via Session Initiation Protocol (SIP) call signaling associated with the VoIP call, a request to a VoIP positioning center for routing information associated with the VoIP call;
- receive routing information associated with the VoIP call, wherein the routing information includes an emergency services query key (ESQK) and an emergency services routing number (ESRN) for the VoIP call;
- translate the routing information into wireless E911 routing elements;
- and
- provide the wireless E911 routing elements to the MSC.
Dependencies are inferred from the claim text.