SS7 ANSI-41 to SIP Based Call Signaling Conversion Gateway for Wireless VOIP E911

• US 20140269511A1
• Filed: 05/27/2014
• Published: 09/18/2014
• Est. Priority Date: 04/04/2006
• Status: Active Grant

• Current Assignee: TeleCommunication Systems Inc (Comtech Telecommunications Corporation)
• Original Assignee: TeleCommunication Systems Inc (Comtech Telecommunications Corporation)
• Inventors: Mitchell, Don
• Granted Patent: US 9,344,578 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04M 7/0066 Details of access arrangements to the networks where the access arrangement is a PSTN/ISDN access H04M7/122
• CPC Class Codes: H04W 4/90 Services for handling of emergency or hazardous situations, e.g. earthquake and tsunami warning systems [ETWS]
• CPC Class Codes: H04W 88/16 Gateway arrangements

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.

Claims

1. A call protocol conversion gateway, comprising:

a module adapted to receive signaling system number 7 (SS7)-based call signaling;

a module 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 module adapted to pass said SIP call signaling to a voice over Internet (VoIP) positioning center.

2-24. -24. (canceled)