# US 8,149,997 B2 · Protocol converting 9-1-1 emergency messaging center > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,149,997 B2 - Document ID: US8149997B2 - Status: Granted - Kind: B2 - Application number: 12/453,869 - Filed: 2009-05-26 - Published: 2010-03-25 - Granted: 2012-04-03 - Earliest claimed: 2009-05-26 - Assignees: TeleCommunication Systems, Inc. - Inventors: Todd Poremba - Web page: https://patentgrep.com/patent/US8149997B2 ## CPC - H04L 12/66: Arrangements for connecting between networks having differing types of switching systems, e.g. gateways - H04L 65/1033: Signalling gateways - H04L 65/1046: Call controllers; Call servers - H04M 3/42348: {Location-based services which utilize the location information of a target} - H04M 7/123: {where the packet-switched network is an Internet Protocol Multimedia System-type network} - H04W 76/50: for emergency connections - H04M 2242/04: for emergency applications - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Delivery of Next Generation 9-1-1 emergency services to an Internet Protocol (IP) Public Safety Answering Point (PSAP) is enabled using an existing or legacy selective router and Automatic Location Information (ALI) database. Using a protocol converting 9-1-1 messaging center according to the principles of the present invention, existing or legacy selective router equipment can provide Enhanced 9-1-1 (E911) over time division multiplex (TDM) circuits to non-IP capable PSAPs. ## Claims ### Claim 1 A protocol converting messaging center, comprising: a media gateway; a back-to-back user agent (B2BUA) that uses Session Internet Protocol (SIP) Body rewrites to insert a current location of an emergency caller device into an emergency call during call setup; a module adapted to integrate with said B2BUA and allow said B2BUA to query various databases using both standard and proprietary protocols; and a module to determine a protocol used to reach a proper responder to said emergency call using information contained in a responder database; wherein said emergency caller device using a time division multiplex (TDM) trunk is able to access a Public Safety Answering Point (PSAP) using Internet Protocol (IP). ### Claim 2 (depends on 1) The protocol converting messaging center according to claim 1, further comprising: a responder database including information regarding capabilities of a relevant PSAP intended to respond to said emergency caller device. ### Claim 3 (depends on 1) The protocol converting messaging center according to claim 1, further comprising: a TDM-to-VoIP (Voice Over Internet Protocol) protocol conversion module to convert an emergency call incoming via a TDM trunk line to access a PSAP (Public Safety Answering Point) using Internet Protocol. ### Claim 4 (depends on 3) The protocol converting messaging center according to claim 3, further comprising: a responder database including information regarding capabilities of a relevant agency intended to respond to said emergency caller device. ### Claim 5 (depends on 1) The protocol converting message center according to claim 1, further comprising: a selective router to route said emergency call from a TDM trunk line to said media gateway. ### Claim 6 (depends on 5) The protocol converting message center according to claim 5, wherein: said media gateway receives said routed emergency call over a TDM trunk line. ### Claim 7 A method of enabling an emergency call from a TDM trunk line to access a PSAP via Internet Protocol (IP), comprising: receiving an emergency call over a TDM trunk; routing said emergency call to a protocol converting messaging center; obtaining a current location of a caller device associated with said emergency call; inserting said current location into an Internet Protocol (IP) packet associated with call setup of said emergency call; routing said IP packet to an IP-capable Public Safety Answering Point (PSAP); and determining a protocol used to reach a proper responder to said emergency call using information contained in a responder database. ### Claim 8 (depends on 7) The method of enabling an emergency call from a TDM trunk line to access a PSAP via Internet Protocol (IP) according to claim 7, wherein: said inserting inserts said current location into a SIP Invite Body of said IP packet in the form of Presence Information Document Format-Location Object (PIDF-LO). ### Claim 9 (depends on 7) The method of enabling an emergency call from a TDM trunk line to access a PSAP via Internet Protocol (IP) according to claim 7, wherein: said obtaining obtains said current location via query to a location information server (LIS). ### Claim 10 (depends on 7) The method of enabling an emergency call from a TDM trunk line to access a PSAP via Internet Protocol (IP) according to claim 7, wherein: said obtaining obtains said current location via query to an automatic location information (ALI). ### Claim 11 Apparatus for enabling an emergency call from a TDM trunk line to access a PSAP via Internet Protocol (IP), comprising: means for receiving an emergency call over a TDM trunk; means for routing said emergency call to a protocol converting messaging center; means for obtaining a current location of a caller device associated with said emergency call; means for inserting said current location into an Internet Protocol (IP) packet associated with call setup of said emergency call; and means for routing said IP packet to an IP-capable Public Safety Answering Point (PSAP); and means for determining a protocol used to reach a proper responder to said emergency call using information contained in a responder database. ### Claim 12 (depends on 11) The apparatus for enabling an emergency call from a TDM trunk line to access a PSAP via Internet Protocol (IP) according to claim 11, wherein: said means for inserting inserts said current location into a SIP Invite Body of said IP packet in the form of Presence Information Document Format-Location Object (PIDF-LO). ### Claim 13 (depends on 11) The apparatus for enabling an emergency call from a TDM trunk line to access a PSAP via Internet Protocol (IP) according to claim 11, wherein: said means for obtaining obtains said current location via query to a location information server (LIS). ### Claim 14 (depends on 11) The apparatus for enabling an emergency call from a TDM trunk line to access a PSAP via Internet Protocol (IP) according to claim 11, wherein: said means for obtaining obtains said current location via query to an automatic location information (ALI).