Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS20080090546 A1
Publication typeApplication
Application numberUS 11/581,454
Publication date17 Apr 2008
Filing date17 Oct 2006
Priority date17 Oct 2006
Also published asUS8150364, US8369825, US8682286, US9125039, US20100046489, US20120189107, US20130149988, US20140155020, US20150365811
Publication number11581454, 581454, US 2008/0090546 A1, US 2008/090546 A1, US 20080090546 A1, US 20080090546A1, US 2008090546 A1, US 2008090546A1, US-A1-20080090546, US-A1-2008090546, US2008/0090546A1, US2008/090546A1, US20080090546 A1, US20080090546A1, US2008090546 A1, US2008090546A1
InventorsRichard Dickinson, John Gordon Hines, Jonathan Croy
Original AssigneeRichard Dickinson, John Gordon Hines, Jonathan Croy
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Enhanced E911 network access for a call center using session initiation protocol (SIP) messaging
US 20080090546 A1
Abstract
A switched emergency call (e.g., a 911 call, an alarm company call) forwarded by a telematics call center is converted into a session initiation protocol (SIP) packetized phone call at the call center, and routed over an IP network, for presentation to an emergency services gateway, which connects to a selective router via dedicated circuits, gaining full access to the Enhanced 911 network. This provides a PSAP receiving a call from a telematics call center or other call center with all features available in an Enhanced 911 network, e.g., callback number of the 911 caller, and location of the 911 caller. Location of the caller is provided using a VoIP positioning center (VPC), queried from the call center. In this way, the switched emergency call is converted into a SIP packetized phone call and routed without further passage through the public switched telephone network (PSTN).
Images(6)
Previous page
Next page
Claims(12)
1. A method of providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP), comprising:
determining a unique PSAP having jurisdictional responsibility for a physical current location of a caller to said call center;
converting said switched telephone call into a session initiation protocol (SIP) packetized phone call at said call center;
querying a VoIP positioning center for call routing instructions for said SIP packetized phone call; and
routing said SIP packetized phone call to an emergency services gateway without further passage through a public switched telephone network (PSTN).
2. The method of providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) according to claim 1, wherein:
said VoIP positioning center is queried from said call center.
3. The method of providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) according to claim 1, further comprising:
providing a designated number for said unique PSAP, said designated number not being a 10-digit phone number dialable on said PSTN.
4. The method of providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) according to claim 1, wherein:
said call center is a telematics call center.
5. The method of providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) according to claim 4, wherein:
said telematics call center is an ONSTAR™, ATX, Cross Country, or ADT call center.
6. The method of providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) according to claim 1, wherein:
said call center is an alarm monitoring center.
7. Apparatus for providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP), comprising:
means for determining a unique PSAP having jurisdictional responsibility for a physical current location of a caller to said call center;
means for converting said switched telephone call into a session initiation protocol (SIP) packetized phone call at said call center;
means for querying a VoIP positioning center for call routing instructions for said SIP packetized phone call; and
means for routing said SIP packetized phone call to an emergency services gateway without further passage through a public switched telephone network (PSTN).
8. The apparatus for providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) according to claim 7, wherein:
said means for querying queries said VoIP positioning center from said call center.
9. The apparatus for providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) according to claim 7, further comprising:
means for providing a designated number for said unique PSAP, said designated number not being a 10-digit phone number dialable on said PSTN.
10. The apparatus for providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) according to claim 7, wherein:
said call center is a telematics call center.
11. The apparatus for providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) according to claim 10, wherein:
said telematics call center is an ONSTAR™, ATX, Cross Country, or ADT call center.
12. The apparatus for providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) according to claim 7, wherein:
said call center is an alarm monitoring center.
Description
    BACKGROUND OF THE INVENTION
  • [0001]
    1. Field of the Invention
  • [0002]
    This invention relates generally to E9-1-1 emergency phone calls. More particularly, it relates to emergency E9-1-1 calls using Voice Over Internet Protocol (VoIP), originating from centralized call centers.
  • [0003]
    2. Background of the Related Art
  • [0004]
    911 is a phone number legislated into law as a designated universal emergency phone number used by callers to access emergency response services. Enhanced 911 (E911) is defined by the transmission of callback number and location information to the relevant public safety answering point (PSAP). A PSAP is the endpoint of an emergency services call. PSAPs are responsible for answering emergency services calls. E911 may be implemented for landline, VoIP, and/or mobile devices. Some Public Safety Access Points (PSAPs) are not enhanced, and thus do not receive the callback or location information from any phone, landline or mobile.
  • [0005]
    Many cars built today include a telematics system. The word “telematics”, in its broadest sense, relates to the combination of computers and wireless telecommunications technologies. More recently, the term “telematics” has evolved to refer to automobile systems that combine global positioning satellite (GPS) tracking and other wireless communications for automatic roadside assistance and remote diagnostics. General Motors Corp. first popularized automotive telematics with its OnStar™ system. Mercedes-Benz offers a similar system called TeleAid™. The use of the word “telematics” throughout the current specification is intended to refer to the later definition of more recent recognition, i.e., to mean automotive telematics.
  • [0006]
    Many new vehicles are equipped with wireless-based telematics units providing services controlled by voice commands. One successful telematics system is available from OnStar Corp. (www.onstar.com). According to OnStar, OnStar brings together emergency service providers, wireless telephone, and satellite technologies to help protect a driver, and keep them connected on the road.
  • [0007]
    As part of the telematics system, a telematics unit including a cellular telephone circuit is located within the vehicle, and powered by the vehicle's battery. Telematics units were originally analog-only, but have migrated to analog/digital-ready, and finally to dual-mode analog/digital. Dual-mode analog/digital telematics units operate on both the analog and digital wireless networks.
  • [0008]
    With a suitable subscription for the use of a telematics operations center such as OnStar, a driver or passenger in a vehicle including a telematics unit has access to a voice-activated calling feature in their vehicle, just in case their hand-held cell phone is lost, forgotten or has a low battery. They can pre-purchase OnStar Hands-Free Calling minutes to use on the road. Such packages are typically billed to a credit card they keep on file with OnStar. They can order minutes packages by pushing the phone or white-dot button at any time.
  • [0009]
    Conventional telematics units are also capable of providing location information to a requesting wireless network, using a Global Positioning Satellite (GPS) mounted in the vehicle, or using other location technology within the wireless network. When a vehicle occupant pushes a given button in the vehicle, essentially calling the telematics operations center, the action initiates the location-determining technology which then transmits vehicle location to the telematics operations center. Moreover, if their air bag deploys, the location of the vehicle can be automatically reported to the telematics operations center. So it's only when the button is pushed to contact the telematics operations center, or when the telematics operations center is responding to an emergency signal, that the telematics operations center is provided with a location of the vehicle.
  • [0010]
    Today, most telematics companies and more generally alarm companies monitor signals from customers' car, home or business. The monitoring is usually centralized in a single location for customer locations across the country (e.g., a station in Columbus, Ohio might monitor homes throughout the country for a given monitoring company. In more global companies, an alarm or other monitoring company might monitor alarm signals from homes in the United States from a centralized command center located in Bombay, India.
  • [0011]
    Thus, in today's global economy, when a customer places an emergency call such as a 911 call (or automated alarm system emergency call), the call may be routed very far away, and in some instances half-way across the world. The telematics operator must then transfer the 911 call to the relevant 911 center (public safety access point (PSAP)). However, this transfer must take place over the Public Switched Telephone Network (PSTN) because such transfer, cannot conventionally be gained to the PSAP's existing Enhanced 911 (E911) dedicated network. Moreover, note that even the call related information (e.g., CallerID) provided with the call would relate to the identity and location of the centralized telematics center-not to the callback number and certainly not the location of the customer originally dialing 911.
  • [0012]
    FIG. 3 shows conventional relevant systems in an emergency 911 call made via a telematics call center.
  • [0013]
    In particular, as shown in FIG. 3, a telematics unit 101 within a car dials 911. The 911 call is serviced by a cell site of a service provider, which includes a given mobile servicing center (MSC) 102. The MSC 102 passes the 911 call on to its relevant telematics call center 104 via the PSTN. The telematics call center 104 may be, e.g., an ONSTAR™ call center.
  • [0014]
    The operator at the telematics call center 104 that handles the 911 call of its own subscriber obtains the identity and location information of the 911 caller. Based on the current location of the 911 caller, the operator performs a query of a telematics PSAP database 106 to determine a unique 10-digit phone number of the proper local PSAP physically responsible for the location of the 911 caller. The telematics PSAP database 106 is essentially the equivalent of an Emergency Routing Data Base (ERDB).
  • [0015]
    The operator at the telematics call center 104 then forwards the 911 caller to the PSAP by dialing its 10-digit phone number via the public switched telephone network (PSTN) 110.
  • [0016]
    Unfortunately, calls that arrive at the PSAP in this manner do not include call-back number (Automatic Number Identification (ANI)) and location information (Automatic Location Identification (ALI)). Moreover, the PSTN telephone 302 at the PSAP 118 is typically not answered with the same priority as are calls that originate on its E911 network. In addition, these calls are typically not recorded or time-stamped by PSAP equipment as are calls that arrive via the E911 network.
  • [0017]
    Trials have been conducted in which a local exchange carrier (LEC) has permitted access to a selective router for the E911 network via the PSTN. In this trial, the LEC designated a specific 10-digit telephone number for each specific PSAP. A caller has their emergency call transferred to this 10-digit telephone number, which is then call-forwarded within the central office to the selective router, which then forwards the call to the correct PSAP based upon the digits dialed. However, this solution suffers from various security issues and has not found favor in the LEC industry or within the PSAP community.
  • [0018]
    Other conventional technology relies on the PSAP having separate, second set of phone equipment capable of receiving proprietary data from the telematics center 104. But this solution would be prohibitively costly to implement nationwide for each telematics center, not to mention take up valuable space inside a PSAP center. Thus, the costs and disruption caused by the need for new hardware makes this a rather undesirable solution.
  • [0019]
    There is the need for a simple and effective solution to providing easy and full access to the Enhanced 911 network of an emergency services provider (e.g., PSAP) from users of a centralized call center, e.g, telematics call center, alarm call center, etc.
  • SUMMARY OF THE INVENTION
  • [0020]
    In accordance with the principles of the present invention, a method and apparatus for providing a call center with access to an Enhanced 911 network supporting a public safety answering point (PSAP) comprises determining a unique PSAP having jurisdictional responsibility for a physical current location of a caller to the call center. The caller is forwarded via a switched telephone network to a VoIP call server. The switched telephone call is converted into a session initiation protocol (SIP) packetized phone call at the call center. A VoIP positioning center is queried for call routing instructions for the SIP packetized phone call. The SIP packetized phone call is routed to an emergency services gateway without further passage through the public switched telephone network (PSTN).
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0021]
    FIG. 1 shows an exemplary E911 architecture including E911 network access provided to a telematics call center or other call center, in accordance with the principles of the present invention.
  • [0022]
    FIG. 2 shows an exemplary call flow tracing an emergency 911 call from a telematics subscriber source to the appropriate PSAP, in accordance with the principles of the present invention.
  • [0023]
    FIG. 3 shows conventional relevant systems in an emergency 911 call made via a telematics call center.
  • [0024]
    FIG. 4 depicts another embodiment showing the use of SIP messaging in lieu of the PSTN for passing an E911 call from a call center, in accordance with the principles of the present invention.
  • [0025]
    FIG. 5 shows message flow for the embodiment shown in FIG. 4.
  • DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS
  • [0026]
    In a first embodiment, an emergency call (e.g., 911 call, alarm company call) forwarded by a telematics call center is routed over the switched PSTN to a Voice Over Internet Protocol (VoIP) call server, where the switched call is converted to a packetized IP call for presentation to an emergency services gateway, gaining access to the Enhanced 911 network. Location of the caller is determined by GPS or other technology in the vehicle or in the wireless network, and is reported to the telematics call center. The telematics center's call back number is provided to the VoIP Positioning Center (VPC) via standard call set-up procedures across the PSTN to the call server, and then from the call server to the VPC. The caller's location may be provided to the VPC via non-call path data links to the telematics call center. The VPC will stage the call-back and location data for subsequent transmission to the PSAP via the ALI database.
  • [0027]
    In a later embodiment, SIP messaging is used in lieu of the PSTN for passing an E911 call from a call center. If a telematics call center has VoIP capability, the PSTN may be avoided by routing telematics E911 calls directly via VoIP between the call center and the VPC.
  • [0028]
    In a last embodiment, wireless emergency services routing keys (ESRKs) are used to route emergency calls to a telematics call center over a Voice Over IP (VoIP) network to an enhanced E911 network of a public service access point (PSAP).
  • [0029]
    Voice Over IP (VoIP) is a technology that has been developed as an alternative telephony technology to the conventional telephony service (e.g. PSTN). VoIP takes advantage of high speed Internet data packet networks, and is able to provide low cost telephony services to end users. VoIP technology emulates a phone call, but instead of using a circuit based system such as the telephone network, utilizes packetized data transmission techniques most notably implemented in the Internet.
  • [0030]
    VoIP phone calls are routed to a VoIP voice gateway, from which they are passed on to their destination VoIP device. Conventional VoIP voice gateways (i.e., soft switches) are typically located in only a few places across the country. A soft switch is a programmable network switch that can process the signaling for all types of packet protocols. Also known as a ‘media gateway controller,’ ‘call agent,’ or ‘call server,’ such devices are used by carriers that support converged communications services by integrating SS7 telephone signaling with packet networks. Softswitches can support, e.g., IP, DSL, ATM and frame relay.
  • [0031]
    Because VoIP is Internet Protocol (IP) based, call related information such as CallerID type services may not be available or accurate. A location of a given VoIP device may be provisioned to be at a given geographic location, or queried from a home location register (HLR) in a mobile system.
  • [0032]
    FIG. 1 shows an exemplary E911 architecture including E911 network access provided to a telematics call center or other call center, in accordance with the principles of the present invention.
  • [0033]
    The present invention applies the switched telephone connectivity of the PSTN to route calls to a media gateway/VoIP call server 112. The switched call is converted into a packetized call using Internet Protocol (IP), and is routed via the internet to the ESGW 114 closest to the appropriate selective router for the destination PSAP. The ESGW converts the packetized IP data back into traditional TDM, and routes the call to the intended selective router 116 via dedicated TDM trunks, where it enters the E911 network. A selective router is the node in an emergency services network that performs enhanced call routing for 911 calls.
  • [0034]
    An example will be used to further illustrate the inventive architecture. In this example, a telematics unit 101 within a car dials 911. The 911 call is serviced by a cell site of a service provider, which includes a given mobile servicing center (MSC) 102. The MSC 102 forwards the 911 call on to its relevant telematics call center 104 via the PSTN. The telematics call center 104 may be, e.g., an ONSTAR™ call center, and may be located anywhere in the country or anywhere in the world.
  • [0035]
    The operator at the telematics call center 104 that handles the 911 call of its own subscriber obtains the nature of the call, as well as the identity and location of the 911 caller. The identity and location of the 911 call from the subscriber is most often received by the call center 104 over the open phone line to their subscriber. Equipment to receive the exact location of the subscriber is expensive, but necessary only at the centralized telematics call center. The thousands of PSAPs in the country do not have the same equipment, as it would be prohibitively expensive.
  • [0036]
    Based on the current location of the 911 caller, the operator performs a query of a telematics PSAP database 106 to determine a local PSAP physically responsible for that location, as well as a unique 10-digit phone number to access the Enhanced 911 network of that PSAP.
  • [0037]
    The operator at the telematics call center 104 handling the 911 call forwards the emergency call to a given media gateway/VoIP call server 112 via the PSTN by dialing the designated 10-digit number for that PSAP To determine the appropriate PSAP and ESGW, the VoIP call server 112 queries a VoIP positioning center (VPC) 130. Using the 10-digit phone number dialed by the call center operator 104, the VPC queries the database 134 to determine the corresponding PSAP. The VPC then assigns an Emergency Services Query Key (ESQK) to the call and relays this routing key back to the VoIP Call Server 112.
  • [0038]
    The VoIP call server 112 passes the 911 emergency call on to an emergency service gateway (ESGW) 114, which in turn passes the 911 emergency call on to the desired PSAP 118. An ESGW resides in a VoIP service provider's network, and is responsible for integrating the session initiation protocol (SIP) network with the emergency services network (TDM). An ESGW 114 network includes dedicated voice trunks to selective routers in the Enhanced 911 (E911) network for any/all PSAPs being served (ideally a national network). The ESGW 114 routes 911 calls to the appropriate selective router, based on the ESRN/ESQK it receives.
  • [0039]
    The selective router 116 is provisioned with emergency services query keys (ESQKs) with ALI steering. (The ESQK is a digit string that uniquely identifies an ongoing emergency services call and is used to correlate the emergency services call with the associated data messages. It may also identify an emergency services zone and may be used to route the call through the network. The ESQK is similar to an ESRK in wireless E911 networks.)
  • [0040]
    A subscriber location database (SLDB) 134 is also provisioned. Preferably the SLDB 134 is configured so that no modifications are required to the core conventional existing VoIP E9-1-1 network. The SLDB 134 is used to relate a Session Initiation Protocol (SIP) Universal Resource Identifier (URI) or a telephone number to a PSAP.
  • [0041]
    In the given embodiments the SLDB 134 includes a listing of a series of “subscribers”, in which each subscriber is really a specific PSAP with a designated 1-900-xxx-yyyy phone number. Note that the phone number does not need to be a 1-900 number as this is used as an example only. This is also a useful technique for billing the call center for this service.
  • [0042]
    In the disclosed embodiments, the address of this “subscriber” is the latitude/longitude (lat/lon) of a centroid of the jurisdiction of the relevant PSAP. Alternatively, in datbases that use tables in lieu of GIS for routing determination, the address of the “subscriber” can be any valid address within the jurisdiction of the PSAP.
  • [0043]
    FIG. 2 shows an exemplary call flow tracing an emergency 911 call from a telematics subscriber source to the appropriate PSAP, in accordance with the principles of the present invention.
  • [0044]
    In particular, as shown in FIG. 2, a caller or automated calling device 101 contacts a local security monitoring company or roadside assistance operator or similar third party call center 104. As an example shown in step 1, a caller 101 dials 911, which is serviced through a wireless MSC 102 and passed on to the relevant telematics call center, e.g., an OnSTAR™ call center. In the given example, the wireless MSC 102 may be part of a wireless carrier's network, with the 911 call being forwarded to the relevant telematics call center 104. Alternatively, the MSC 102 may be part of a large wireless network used by the telematics company itself.
  • [0045]
    The 911 call may be placed using an SOS or similar single-press button located in a car for use in emergency situations, automatically in the event of an accident, etc. Alternatively, the phone user may simply dial 911 in a manual cell phone call from a mobile phone, either integrated into a vehicle or entirely separate from a vehicle.
  • [0046]
    In step 2, a wireless MSC 102 routes the incoming emergency call to a telematics call center 104 (e.g., an ONSTAR™ or TeleAid™ call center). In the given example this routing includes use of the PSTN 110, though this need not be the case in all applications.
  • [0047]
    The call taker at the call center 104 who receives the 911 call from the caller 101 determines that this is an emergency call that must be referred to the local 911 PSAP.
  • [0048]
    Thus, in step 3, the telematics call taker queries an existing telematics PSAP database 106 to determine the correct PSAP to which the call should be routed. Of course, to save time step 3 may be performed simultaneous with, or even prior to, the call taker's determination that the call from the mobile user 101 is an emergency call.
  • [0049]
    In step 4, a telematics dispatcher dials (could be the same person and/or equipment as the call taker) a NPA-xxx-yyyy number designated for the determined PSAP. For instance, the call taker at the call center 104 then dials 1-900-xxx-yyyy, a designated number for that PSAP 118, and prepares to conduct a conference call with the caller 101 and the PSAP 118.
  • [0050]
    The call is then routed, via the PSTN 110, to a designated VoIP call server 112 (alternatively referred to as a media gateway). The media gateway and the VoIP call server may be two distinct functions co-located in the same unit, as in the present embodiment. The media gateway converts TDM to IP. The VoIP call server routes the resulting IP calls much like a traditional telephone switch routes a TDM call.
  • [0051]
    The VoIP call server 112 receives the ANI (caller ID) of the call center. The VoIP media gateway 112 reformats the call from time division multiplex (TDM) or code division multiplexed (CDM) into session initiation protocol (SIP). The VoIP Call Server rearranges the dialed digits, putting the DID that was dialed in step iii (e.g., 1-900-xxx-yyyy) in the FROM field and putting the ANI of the call center into the Just-in-Time callback number (JIT CBN) field within the P-Asserted Identity in the SIP Invite. (Session initiation protocol (SIP) is an IP-based protocol defined in IETF RFCs 3261 and 2543, the entirety of which are expressly incorporated herein by reference. SIP is one of two dominant messaging protocols used by the VoIP industry.
  • [0052]
    Importantly, the VoIP Media Gateway/call server 112 converts the TDM or CDM protocol of the incoming switched network phone call to packet data using session initiation protocol (SIP), and vice versa, meaning that packetized VoIP information coming from a relevant PSAP is converted into a switched connection with the 911 caller, terminated at the VoIP call server 112.
  • [0053]
    In step 5, the VoIP call server 112 forwards the 911 call to the VPC 130 as a VoIP call. The Invite is received by the VPC 130 for call routing instructions.
  • [0054]
    The VPC 130 is an application that determines the appropriate PSAP, based on the location of the 911 caller 101, returns associated routing instructions to the VoIP network, and provides the call center's identity and the callback number to the PSAP through the automatic location identification (ALI). (An ALI is a database that relates a specific telephone number to an address. This database accepts a PSAP query with a telephone number and responds with an address. In the case of an ESQK, the ALI database steers (redirects) the query to the appropriate VoIP positioning center and steers the response back to the querying PSAP).
  • [0055]
    A SIP Invite command may be used for the query from the Call Server 112 to the VPC 130. The disclosed SIP Invite command preferably includes the following parameters:
  • [0000]
    a ) The '' from '' field = the dialed digits from the call center ( NPA - xxx - yyyy ) b ) The '' to '' field = 911 c ) The JIT CBN field = callback number of the call center
  • [0056]
    In step 6, the VoIP positioning center 132 queries an ERDB (SLDB) 134 for call routing instructions based upon the dialed NPA-xxx-yyyy number. The ERDB 134 relates the dialed number to the address of that phone number (lat/lon of the PSAP jurisdictional centroid) and determines the appropriate PSAP to receive the call. Within the ERDB 134, each phone number corresponds to a different PSAP.
  • [0057]
    In step 7, the ERDB 134 responds to the VPC 130 with the identity of the appropriate PSAP to serve the caller 101. The VPC 130 assigns an ESQK and emergency services routing number (ESRN) to the call and stages an ALI record. The ESRN is a 10-digit number that specifies the selective router to be used to route a call. The ALI record contains the phone number of the call center 104, based upon the ANI that accompanied the call. If the call center 104 is capable of sending the ANI of the actual end user, then this can be staged in the VPC ALI record.
  • [0058]
    Further call processing is otherwise per the conventional NENA i2 VoIP standard:
  • [0059]
    For instance, in step 8, the VoIP positioning center 130 assigns an emergency services query key (ESQK) appropriate to that PSAP, and stages a record with the call center call back number (CBN) and call center company ID.
  • [0060]
    The VoIP positioning center 130 responds to the VoIP call server 112 with the ESQK, emergency services routing number (ESRN), and last routing option (LRO). (The LRO is routing information sent by the VPC 130 that provides a “last chance” destination for a call, for example the contingency routing number (CRN) or a routing number associated with a national call center.
  • [0061]
    In step 9, the VoIP call server 112 uses the ESRN to route the call to the correct emergency services gateway (ESGW) 114.
  • [0062]
    The VoIP call server 112 uses the received ESRN to determine the appropriate ESGW 114 and routes the call appropriately to the correct emergency services gateway (ESGW) 114. The ESGW 114 uses the ESRN to determine the appropriate selective router 116. For simplicity and clarity of description, only one ESGW 114 and one selective router 116 are pictured in FIG. 2.
  • [0063]
    In step 10, the ESGW 114 performs media conversion by converting the SIP protocol (and vice versa in the opposite communication direction), and uses the ESRN to route the call to the correct selective router 116, along with the ESQK.)
  • [0064]
    In step 11, the selective router 116 routes the ESQK to the PSAP 118.
  • [0065]
    In step 12, the PSAP 118 queries the automatic location identification (ALI) database 120 using the ESQK.
  • [0066]
    In step 13, the ALI database 120 steers the query to the VoIP positioning center (VPC) 130, per previously provisioned steering tables. The VPC 130 responds with a staged record that includes the callback number (CBN) and call center company ID. In the preferred embodiments, no latitude/longitude (lat/lon) is sent in the ALI record, although such data could be forwarded if it is available.
  • [0067]
    In step 14, the ALI database 120 forwards the callback number (CBN) and call center ID to the requesting PSAP 118.
  • [0068]
    FIG. 4 depicts another embodiment showing the use of SIP messaging in lieu of the PSTN for passing an E911 call from a call center, in accordance with the principles of the present invention.
  • [0069]
    In particular, according to the embodiment shown in FIG. 4, in the event that a telematics call center has VoIP capability, the PSTN 110 may be eschewed by routing the telematics E911 call directly via VoIP between the call center 104 and the VPC 132.
  • [0070]
    As seen in FIG. 4, the PSTN of FIG. 1 is eliminated from the call flow. In this embodiment, each PSAP is assigned a designated 10-digit number that is provisioned in the telematics PSAP database 106. However, unlike the embodiment of FIG. 1, these 10-digit numbers need not be dialable via the PSTN. Instead, they can be assigned by the participating entities without regard to what numbers may be in use by other parties that use the PSTN. In fact, they do not necessarily need to be 10-digit numbers at all. Because they never see the light of day and remain at all times internal to the telematics vendor and the VPC, these PSAP-identifiers can be any mutually compatible predetermined format.
  • [0071]
    To accomplish this, the telematics call center includes what would otherwise be included at the telematics call center 104 shown in FIG. 1, but additionally a session initiation protocol (SIP) private branch exchange (PBX) or telephone switch 104B.
  • [0072]
    FIG. 5 shows message flow for the embodiment shown in FIG. 4.
  • [0073]
    In particular, as shown in step 1 of FIG. 5, a cell site picks up and relays a 911 call made from a wireless subscriber to the carrier's wireless mobile switching center (MSC) 102.
  • [0074]
    In step 2, the wireless MSC 102 passes the wireless 911 call to the telematics call center 104A, which in this embodiment is associated with a SIP PBX or voice over Internet protocol (VoIP) switch 104B.
  • [0075]
    As shown in step 3, upon receipt of the 911 call, the call taker at the telematics call center 104B accesses the local telematics PSAP database 106 to determine routing (as otherwise shown and described with respect to the embodiment of FIGS. 1 and 2).
  • [0076]
    In response, the telematics PSAP database 106 provides a designated PSAP number for that PSAP that need not be a 10-digit number that is dialable on the PSTN.
  • [0077]
    As shown in FIG. 4, the telematics call taker dials the designated PSAP number and initiates a conference call, or transfers the call. However, when the telematics call taker dials the designated PSAP number, the integrated telematics VoIP switch 104B translates the designated PSAP number into a specific SIP message.
  • [0078]
    The VoIP switch initiates a SIP INVITE message in which the “TO” address is a universal resource indicator (URI) address equal to a specific mailbox at the VoIP positioning center (VPC) 132 reserved for the PSAP designated by the original designated PSAP number. The “Just in time Call back Number” (JITCBN) is preferably provisioned to be the PSTN-dialable phone number of the telematics call taker at the telematics call center 104A.
  • [0079]
    In step 5, the SIP INVITE message is passed to the VoIP positioning center 132.
  • [0080]
    In steps 6-8, the VPC 132 selects an ESQK, ESRN and LRO appropriate to the PSAP designated in the SIP INVITE message, and will establish RTP between the SIP switch 104B and the ESGW 114 indicated by the selected ESRN.
  • [0081]
    In step 9, a voice path is established via Internet Protocol (IP) between the VoIP switch 104B and the ESGW 114.
  • [0082]
    As is otherwise described herein with respect to the embodiment of FIGS. 1 and 2, the ESGW 114 performs media conversion from Internet Protocol (IP) to time division multiplexing (TDM).
  • [0083]
    In step 10, the ESGW 114 routes the call in TDM format to the designated selective router 116 according to the ESRN or the ESQK.
  • [0084]
    In step 11, the selective router 116 determines the destination PSAP based upon the ESQK, and routes the call to the PSAP 118 per existing technology.
  • [0085]
    As in the embodiments described above, the VPC 132 stages an ALI record when it responds to the SIP INVITE. This record consists of the assigned ESQK, plus the call back number (CBN) received in the JITCBN field of the SIP INVITE message, plus other data as available and as desired by the PSAP 118, e.g., NENA ID, lat/lon, etc.
  • [0086]
    In step 12, upon receipt of the call, the PSAP 118 initiates a standard query to the ALI database 120 per existing technology.
  • [0087]
    In step 13, the ALI database 120 routes that query from the PSAP 118 to the VPC 132 per otherwise existing technology.
  • [0088]
    In step 14, the VPC responds to the ALI query with the staged record, including a callback number and other data as desired by the PSAP 118.
  • [0089]
    In accordance with the present invention, benefits are derived by routing 911 calls via the Enhanced E911 network. Moreover, PSAPs can utilize all available technologies available to them in an Enhanced E911 network such as CAD, selective transfer, etc. when responding to a call from a telematics or other call center.
  • [0090]
    The present invention makes possible the transfer of misrouted or defaulted VoIP calls from a VoIP default call center to the appropriate PSAP via the Enhanced E911 network. In conventional systems defaulted calls must be routed via the PSTN.
  • [0091]
    This invention saves taxpayers money by allowing PSAPs to discontinue designated PSTN lines. This invention also increases the speed with which emergency services (responders) can be dispatched and provides recorded documentation of conversations that are typically available on calls received via the E911 network, but not via the PSTN.
  • [0092]
    The present invention has particular relevance for use by any alarm monitoring company, telematics call center, or emergency call center that monitors incoming calls. The invention has significant benefit in the use by automotive roadside assistance call centers like OnStar™, TeleAid, etc.
  • [0093]
    While the invention has been described with reference to the exemplary embodiments thereof, those skilled in the art will be able to make various modifications to the described embodiments of the invention without departing from the true spirit and scope of the invention.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4494119 *4 Aug 198315 Jan 1985122923 Canada LimitedDistress radiolocation method and system
US4651156 *28 Feb 198517 Mar 1987Mcgraw-Edison Co.Integrated radio location and communication system
US4891638 *30 Oct 19872 Jan 1990Motorola, Inc.Nationwide display pager with location readout
US4891650 *16 May 19882 Jan 1990Trackmobile Inc.Vehicle location system
US5081667 *20 Mar 199014 Jan 1992Clifford Electronics, Inc.System for integrating a cellular telephone with a vehicle security system
US5177478 *29 Jan 19925 Jan 1993Kabushiki Kaisha ToshibaPaging system having an effective ID-code transferring function
US5193215 *25 Jan 19909 Mar 1993Olmer Anthony LLocation signalling device for automatically placing a radio distress call
US5283570 *22 Feb 19911 Feb 1994Motorola, Inc.Multiple format signalling protocol for a selective call receiver
US5289527 *20 Sep 199122 Feb 1994Qualcomm IncorporatedMobile communications device registration method
US5293642 *19 Dec 19908 Mar 1994Northern Telecom LimitedMethod of locating a mobile station
US5299132 *28 Jul 199229 Mar 1994By-Word Technologies, Inc.Vehicle locating and communicating method and apparatus using cellular telephone network
US5379451 *6 Nov 19923 Jan 1995Hitachi, Ltd.Mobile communication system and location registration method in mobile communication system
US5381338 *18 Nov 199310 Jan 1995Wysocki; David A.Real time three dimensional geo-referenced digital orthophotograph-based positioning, navigation, collision avoidance and decision support system
US5387993 *25 Jun 19937 Feb 1995Precision Tracking Fm, Inc.Method for receiving and transmitting optical data and control information to and from remotely located receivers and transmitters in an optical locator system
US5388147 *30 Aug 19937 Feb 1995At&T Corp.Cellular telecommunication switching system for providing public emergency call location information
US5390339 *23 Oct 199114 Feb 1995Motorola Inc.Method and apparatus for selecting a serving transceiver
US5394158 *25 Jul 199128 Feb 1995British Telecommunications Public Limited CompanyLocation determination and handover in mobile radio systems
US5396227 *5 May 19937 Mar 1995Jurismonitor, Inc.Electronic system and method for monitoring compliance with a protective order
US5398190 *6 Jan 199414 Mar 1995Hm Holding CorporationVehicle locating and communicating method and apparatus
US5485161 *21 Nov 199416 Jan 1996Trimble Navigation LimitedVehicle speed control based on GPS/MAP matching of posted speeds
US5485163 *30 Mar 199416 Jan 1996Motorola, Inc.Personal locator system
US5488563 *2 Apr 199330 Jan 1996Dassault ElectroniqueMethod and device for preventing collisions with the ground for an aircraft
US5494091 *6 Jun 199527 Feb 1996Bridgestone CorporationHigh modulus low hysteresis rubber compound for pneumatic tires
US5592535 *2 Apr 19967 Jan 1997Alcatel Sel AktiengesellschaftMobile-radio network with debit accounts
US5594780 *2 Jun 199514 Jan 1997Space Systems/Loral, Inc.Satellite communication system that is coupled to a terrestrial communication network and method
US5604486 *27 May 199318 Feb 1997Motorola, Inc.RF tagging system with multiple decoding modalities
US5606313 *14 Nov 199525 Feb 1997Motorola, Inc.Low power addressable data communication device and method
US5606618 *27 Dec 199325 Feb 1997U.S. Philips CorporationSubband coded digital transmission system using some composite signals
US5857201 *18 Jun 19965 Jan 1999Wright Strategies, Inc.Enterprise connectivity to handheld devices
US5864667 *22 Aug 199726 Jan 1999Diversinet Corp.Method for safe communications
US5874914 *8 Mar 199623 Feb 1999Snaptrack, Inc.GPS receiver utilizing a communication link
US6014602 *28 Aug 199811 Jan 2000Advanced Safety Concepts, Inc.Motor vehicle occupant sensing systems
US6032051 *1 Dec 199729 Feb 2000Telefonaktiebolaget L/M EricssonWireless mobile comunication devices for group use
US6169891 *26 Apr 19992 Jan 2001At&T Corp.Method and apparatus for billing of wireless telephone calls
US6169901 *24 Mar 19972 Jan 2001U.S. Philips CorporationMobile telephone with interial identifier in location messages
US6169902 *8 Apr 19982 Jan 2001Sony CorporationInformation terminal, processing method by information terminal, information providing apparatus and information network system
US6173181 *7 Nov 19979 Jan 2001Motorola, Inc.Method and system for controlling neighbor scanning in a subscriber unit in a cellular communication system
US6178505 *4 Mar 199823 Jan 2001Internet Dynamics, Inc.Secure delivery of information in a network
US6178506 *23 Oct 199823 Jan 2001Qualcomm Inc.Wireless subscription portability
US6181935 *8 May 199730 Jan 2001Software.Com, Inc.Mobility extended telephone application programming interface and method of use
US6188354 *29 Mar 199913 Feb 2001Qualcomm IncorporatedMethod and apparatus for determining the location of a remote station in a CDMA communication network
US6188752 *12 Nov 199613 Feb 2001Telefonaktiebolaget Lm Ericsson (Publ)Method and apparatus for providing prepaid telecommunications services
US6188909 *20 Feb 199713 Feb 2001Nokia Mobile Phones, Ltd.Communication network terminal supporting a plurality of applications
US6189098 *16 Mar 200013 Feb 2001Rsa Security Inc.Client/server protocol for proving authenticity
US6195557 *20 Apr 199827 Feb 2001Ericsson Inc.System and method for use of override keys for location services
US6504491 *27 May 19997 Jan 2003Motorola, Inc.Simultaneous multi-data stream transmission method and apparatus
US6505049 *23 Jun 20007 Jan 2003Motorola, Inc.Method and apparatus in a communication network for facilitating a use of location-based applications
US6510387 *26 Nov 200121 Jan 2003Global Locate, Inc.Correction of a pseudo-range model from a GPS almanac
US6512922 *25 Jan 200028 Jan 2003Motorola, Inc.Information services provision in a telecommunications network
US6512930 *30 Dec 199728 Jan 2003Telefonaktiebolaget Lm Ericsson (Publ)On-line notification in a mobile communications system
US6515623 *29 Jun 20014 Feb 2003Motorola, Inc.Enhanced location methodology for a location system
US6519466 *5 Feb 200211 Feb 2003Sirf Technology, Inc.Multi-mode global positioning system for use with wireless networks
US6522682 *2 Mar 199918 Feb 2003Sirf Technology, Inc.Triple multiplexing spread spectrum receiver
US6677894 *30 Nov 199813 Jan 2004Snaptrack, IncMethod and apparatus for providing location-based information via a computer network
US6691019 *21 Dec 200110 Feb 2004General Electric CompanyMethod and system for controlling distortion of turbine case due to thermal variations
US6694258 *17 Sep 200117 Feb 2004Siemens Vdo Automotive CorporationHand held car locator
US6697629 *11 Oct 200024 Feb 2004Qualcomm, IncorporatedMethod and apparatus for measuring timing of signals received from multiple base stations in a CDMA communication system
US6839020 *2 Jun 20034 Jan 2005Motorola, Inc.Aiding location determinations in satellite positioning system receivers
US6839021 *13 Jun 20034 Jan 2005Qualcomm IncorporatedMethod and apparatus for determining time in a satellite positioning system
US6839417 *10 Sep 20024 Jan 2005Myriad Entertainment, Inc.Method and apparatus for improved conference call management
US6842715 *21 Jul 200311 Jan 2005Qualcomm IncorporatedMultiple measurements per position fix improvements
US6847822 *15 Sep 200025 Jan 2005Sycord Limited PartnershipCellular telephone system that uses position of a mobile unit to make call management decisions
US6853916 *15 Nov 20028 Feb 2005Global Locate, Inc.Method and apparatus for forming a pseudo-range model
US6856282 *29 Oct 200215 Feb 2005Qualcomm IncorporatedDirectly acquiring precision code GPS signals
US6985747 *5 Feb 200410 Jan 2006Autodesk, Inc.Use of triggers and a location hypercube to enable push-based location applications
US6990081 *27 Mar 200124 Jan 2006Motorola, Inc.Conference call bridge arrangement
US6993355 *22 Feb 200231 Jan 2006Verizon Services Corp.Methods and apparatus for connecting family members
US6996720 *27 Jun 20007 Feb 2006Microsoft CorporationSystem and method for accessing protected content in a rights-management architecture
US6999782 *19 Feb 200314 Feb 2006Motorola, Inc.Method for joining dispatch calls
US7171220 *12 Mar 200430 Jan 2007Meshnetworks, Inc.System and method for analyzing the precision of geo-location services in a wireless network terminal
US7177397 *24 Mar 200413 Feb 2007Intrado Inc.Geographic routing of emergency service call center emergency calls
US7177399 *4 Jun 200413 Feb 2007Nortel Network LimitedDetermining the geographical location from which an emergency call originates in a packet-based communications network
US7330899 *9 Oct 200312 Feb 2008Oracle International CorporationApparatus and method for developing applications with telephony functionality
US7333480 *20 Sep 200419 Feb 2008Nortel Networks LimitedLocalization of call routing for TDM sets in an IP network
US20030009602 *25 Apr 20029 Jan 2003Jacobs Paul E.Extensible event notification mechanism
US20030012148 *10 Jul 200116 Jan 2003Michael PetersSoftware based single agent multipoint conference capability
US20030013449 *11 Jul 200116 Jan 2003Hose David A.Monitoring boundary crossings in a wireless network
US20030016804 *11 Jul 200223 Jan 2003Sheha Michael A.Position determination system
US20030037163 *8 Mar 200220 Feb 2003Atsushi KitadaMethod and system for enabling layer 2 transmission of IP data frame between user terminal and service provider
US20030040272 *24 Aug 200127 Feb 2003Charles LelievreLocation-based selection of radio content sources
US20040002326 *28 Jun 20021 Jan 2004Philip MaherSystem and method for application management through threshold events
US20040004761 *3 Oct 20018 Jan 2004Travis Adrian Robert LeighFlat-panel display
US20040032485 *18 Aug 200319 Feb 2004Stephens James H.System and method for communication device configuration, scheduling and access control
US20050028034 *9 Jul 20043 Feb 2005Alexander GantmanFault diagnosis, repair and upgrades using the acoustic channel
US20050039178 *28 Jun 200417 Feb 2005Sunil MaroliaSystem and method for downloading update packages into a mobile handset in a carrier network
US20050041578 *11 Dec 200324 Feb 2005Nokia CorporationSetting up communication sessions
US20050043037 *16 Jul 200224 Feb 2005Ioppe Igor V.System for providing alert-based services to mobile stations in a wireless communications network
US20060008065 *8 Jul 200412 Jan 2006Timothy LongmanMethod for setting up a conference call
US20060023747 *27 Jul 20042 Feb 2006Eitan KorenMethod and apparatus for session layer framing to enable interoperability between packet-switched systems
US20060026288 *30 Jul 20042 Feb 2006Arup AcharyaMethod and apparatus for integrating wearable devices within a SIP infrastructure
US20070003024 *22 Jun 20054 Jan 2007Cml Emergency Services Inc.Network emergency call taking system and method
US20070014282 *17 Jul 200618 Jan 2007Don MitchellIntegrated services user part (ISUP) /session initiation protocol (SIP) gateway for unlicensed mobile access (UMA) emergency services call flow
US20070019614 *9 Sep 200325 Jan 2007Klaus HoffmannMethod for providing a user interaction dialogue (uid) prior to connection acceptance by the called user
US20070021908 *21 Jul 200525 Jan 2007Jeppesen Sanderson Inc.System and method for data mapping and map discrepancy reporting
US20070022011 *28 Sep 200625 Jan 2007Utbk, Inc.Methods and apparatuses to determine prices of communication leads
US20070026854 *27 Jul 20061 Feb 2007Mformation Technologies, Inc.System and method for service quality management for wireless devices
US20070027997 *6 Jan 20061 Feb 2007Cisco Technology, Inc.Technique for translating location information
US20070030539 *27 Jul 20068 Feb 2007Mformation Technologies, Inc.System and method for automatically altering device functionality
US20080037715 *29 Jun 200614 Feb 2008Nortel Networks Ltd.Adaption of emergency calls to the emergency services network based on caller location
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US775181524 Jul 20066 Jul 2010Aircell LlcSystem for integrating an airborne wireless cellular network with terrestrial wireless cellular networks and the public switched telephone network
US8051036 *28 Jun 20071 Nov 2011Alcatel LucentMethod and apparatus for management and updating of distributed user databases
US807344314 Apr 20096 Dec 2011Gogo LlcSIP client-based local number portability through an aircraft air-to-ground link
US814520831 Oct 200627 Mar 2012Gogo LlcAir-to-ground cellular communication network terrestrial base station having multi-dimensional sectors with alternating radio frequency polarizations
US82549148 Sep 201128 Aug 2012Gogo, LLCSystem for creating an air-to-ground IP tunnel in an airborne wireless cellular network to differentiate individual passengers
US83065282 Sep 20116 Nov 2012Gogo LlcSystem for managing an aircraft-oriented emergency services call in an airborne wireless cellular network
US84054997 Aug 200926 Mar 2013At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US844251929 Jun 201114 May 2013Gogo LlcSpectrum sharing between an aircraft-based air-to-ground communication system and existing geostationary satellite services
US845227619 Jan 201128 May 2013Gogo LlcDifferentiated services code point mirroring for wireless communications
US845762719 Jan 20114 Jun 2013Gogo LlcTraffic scheduling system for wireless communications
US8483705 *6 Feb 20079 Jul 2013Sprint Communications Company L.P.GPS proxy for location-unaware devices
US862621015 Nov 20107 Jan 2014At&T Intellectual Property I, L.P.Methods, systems, and products for security systems
US869266510 Nov 20118 Apr 2014At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US8731741 *21 Dec 200720 May 2014General Motors LlcMethod for providing a security service using a vehicle keyfob
US884774910 Nov 201130 Sep 2014At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US890274010 Nov 20112 Dec 2014At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US891402212 Jun 200816 Dec 2014Gogo LlcSystem for providing high speed communications service in an airborne wireless cellular network
US893765815 Oct 200920 Jan 2015At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US902012326 Aug 200828 Apr 2015At&T Intellectual Property I, L.P.Apparatus and method for managing priority communication
US913580613 Feb 201415 Sep 2015At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US924674022 Feb 201326 Jan 2016At&T Intellectual Property I, L.P.Methods, systems, and products for security systems
US927738110 Nov 20111 Mar 2016At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US931800530 Oct 201419 Apr 2016At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US937991510 Nov 201128 Jun 2016At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US939663410 Nov 201119 Jul 2016At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US942660823 May 201323 Aug 2016Sprint Communications Company L.P.GPS proxy for location-unaware devices
US9521526 *27 Feb 201313 Dec 2016Qualcomm IncorporatedControlling the transfer of telematics data using session related signaling
US958298623 Aug 201528 Feb 2017At&T Intellectual Property I, L.P.Methods, systems, and products for security services
US20070021117 *24 Jul 200625 Jan 2007Aircell, Inc.System for integrating an airborne wireless cellular network with terrestrial wireless cellular networks and the public switched telephone network
US20080274734 *12 Jun 20086 Nov 2008Aircell LlcSystem for providing high speed communications service in an airborne wireless cellular network
US20090007238 *28 Jun 20071 Jan 2009Thierry Etienne KleinMethod and Apparatus for Management and Updating of Distributed User Databases
US20090067420 *11 Sep 200712 Mar 2009General Instrument CorporationLocation Determination for a Packet-Switched Device for Providing Location-Based Services
US20090164053 *21 Dec 200725 Jun 2009General Motors CorporationMethod for providing a security service using a vehicle keyfob
US20090168974 *26 Dec 20072 Jul 2009General Motors CorporationVehicle emergency call handling and routing to psaps
US20110032095 *7 Aug 200910 Feb 2011Hicks Iii John AlsonMethods, Systems, and Products for Security Services
US20110063354 *19 Nov 201017 Mar 2011Enge James MPrinting method for reducing stitch error between overlapping jetting modules
US20110090334 *15 Oct 200921 Apr 2011Hicks Iii John AlsonMethods, Systems, and Products for Security Services
US20140094210 *27 Feb 20133 Apr 2014Qualcomm IncorporatedControlling the transfer of telematics data using session related signaling
Classifications
U.S. Classification455/404.1
International ClassificationH04M11/04
Cooperative ClassificationH04L65/1006, G01S19/01, H04M7/006, H04W4/046, H04M3/42059, H04M3/58, H04M2242/30, H04M7/1205, H04M3/5116, H04L65/1069, H04M11/00, H04M11/04, H04W4/22
European ClassificationH04L29/06M2S1, H04M3/51E, H04M7/12H, H04M3/58
Legal Events
DateCodeEventDescription
17 Oct 2006ASAssignment
Owner name: TELECOMMUNICATION SYSTEMS, INC., MARYLAND
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DICKINSON, RICHARD;HINES, JOHN GORDON;CROY, JONATHAN;REEL/FRAME:018429/0203
Effective date: 20061016
29 Jan 2010ASAssignment
Owner name: SILICON VALLEY BANK, AGENT, MASSACHUSETTS
Free format text: SECURITY AGREEMENT;ASSIGNORS:TELECOMMUNICATION SYSTEMS, INC.;LONGHORN ACQUISITION, LLC;SOLVERN INNOVATIONS, INC.;AND OTHERS;REEL/FRAME:023870/0484
Effective date: 20091231
Owner name: SILICON VALLEY BANK, AGENT,MASSACHUSETTS
Free format text: SECURITY AGREEMENT;ASSIGNORS:TELECOMMUNICATION SYSTEMS, INC.;LONGHORN ACQUISITION, LLC;SOLVERN INNOVATIONS, INC.;AND OTHERS;REEL/FRAME:023870/0484
Effective date: 20091231
3 Mar 2016ASAssignment
Owner name: TELECOMMUNICATION SYSTEMS, INC., MARYLAND
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:SILICON VALLEY BANK;REEL/FRAME:037994/0113
Effective date: 20160223
Owner name: NETWORKS IN MOTION, INC., WISCONSIN
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:SILICON VALLEY BANK;REEL/FRAME:037994/0113
Effective date: 20160223
Owner name: SOLVEM INNOVATIONS, INC., MARYLAND
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:SILICON VALLEY BANK;REEL/FRAME:037994/0113
Effective date: 20160223
Owner name: LONGHORN ACQUISITION, LLC, MARYLAND
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:SILICON VALLEY BANK;REEL/FRAME:037994/0113
Effective date: 20160223
Owner name: QUASAR ACQUISITION, LLC, GEORGIA
Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:SILICON VALLEY BANK;REEL/FRAME:037994/0113
Effective date: 20160223