IP Library › Granted Patent US 8,155,109
Granted Patent B2
US 8,155,109 · App. 11/417,128 · Granted Apr 10, 2012

SS7 ISUP to SIP based call signaling conversion gateway for wireless VoIP E911

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Quick Facts
Patent No.
US 8,155,109
App. No.
11/417,128
Granted
Apr 10, 2012
Kind
B2
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 (11)

1. 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:

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) ISUP based call signaling;

converting said SS7 ISUP based call signaling into session initiation protocol (SIP) call signaling;

passing said SIP call signaling to a voice over Internet (VoIP) positioning center;

receiving 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).

2. The 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) according to claim 1 , wherein:

said trunk select code is further translated into a public switched telephone network phone number to provide a last routing option (LRO).

3. The 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) according to claim 2 , further comprising:

egressing said VoIP call based upon said ESRK and said trunk select code to a proper PSAP.

Assignments (4)
SECURITY AGREEMENT Recorded Mar 3, 2016
From: COMTECH EF DATA CORP.; COMTECH XICOM TECHNOLOGY, INC.; COMTECH MOBILE DATACOM CORPORATION; TELECOMMUNICATION SYSTEMS, INC.
To: CITIBANK N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 037993/0001 →
RELEASE OF SECURITY INTEREST Recorded Mar 3, 2016
From: SILICON VALLEY BANK
To: TELECOMMUNICATION SYSTEMS, INC.; LONGHORN ACQUISITION, LLC; SOLVEM INNOVATIONS, INC.; QUASAR ACQUISITION, LLC; NETWORKS IN MOTION, INC.
Reel/Frame 037994/0113 →
SECURITY AGREEMENT Recorded Jan 29, 2010
From: TELECOMMUNICATION SYSTEMS, INC.; LONGHORN ACQUISITION, LLC; SOLVERN INNOVATIONS, INC.; QUASAR ACQUISITION, LLC; NETWORKS IN MOTION, INC.
To: SILICON VALLEY BANK, AGENT
Reel/Frame 023870/0484 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 4, 2006
From: MITCHELL, DON
To: TELECOMMUNICATIONS SYSTEMS, INC.
Reel/Frame 017865/0931 →