Source: http://www.google.com/patents/US5388145
Timestamp: 2018-01-17 15:23:08
Document Index: 85264569

Matched Legal Cases: ['arty 24', 'arty 24', 'arty 24', 'arty 24', 'arty 24', 'arty 24', 'arty 24', 'arty 24', 'arty 24', 'arty 24', 'arty 24']

Patent US5388145 - Internode routing for a telephone system - Google Patents
An internode routing for an emergency telephone system (14) having a first switch (16) for routing telephone calls, a second switch (18) for routing telephone calls, a device (16 or 18) for defining emergency service zones for each of the first and second switches (16 or 18), and a device (16) for transferring...http://www.google.com/patents/US5388145?utm_source=gb-gplus-sharePatent US5388145 - Internode routing for a telephone system
Publication number US5388145 A
Application number US 07/975,421
Publication date Feb 7, 1995
Publication number 07975421, 975421, US 5388145 A, US 5388145A, US-A-5388145, US5388145 A, US5388145A
Inventors Robert J. Mulrow, Donald J. Jester
Patent Citations (11), Non-Patent Citations (2), Referenced by (34), Classifications (11), Legal Events (18)
Internode routing for a telephone system
US 5388145 A
An internode routing for an emergency telephone system (14) having a first switch (16) for routing telephone calls, a second switch (18) for routing telephone calls, a device (16 or 18) for defining emergency service zones for each of the first and second switches (16 or 18), and a device (16) for transferring a telephone call placed to the first switch (16) to the second switch (18) for completion to a public safety answering point responsive to the condition of the public safety answering point being located in the emergency service zone associated with the second switch (18).
1. An internode routing for an emergency telephone system, comprising:
first switch means for routing emergency telephone calls;
second switch means for routing emergency telephone calls;
means for defining emergency service zones for each of the first and second switch means; and
means in the first and second switch means for transferring a telephone call placed to the first switch means to the second switch means for completion to a public safety answering point responsive to a condition of the public safety answering point being located in the emergency service zone associated with the second switch means, wherein the second switch means includes means for determining whether the first or second switch means should service the emergency service zone associated with a telephone number of a calling party.
2. The system of claim 1 wherein the transferring means comprises means for interconnecting the first and second switch means.
3. The system of claim 1 including means for transferring the telephone call back from the second switch means to the first switch means for completion.
4. The system of claim 1 in which the first switch means includes means for determining the emergency service zone of the public safety answering point.
5. The system of claim 4 wherein the emergency service zone is associated with the first switch means.
6. The system of claim 4 wherein the emergency service zone is associated with the second switch means.
7. The system of claim 1 including means in the first switch means for mapping a telephone number of a calling party to the emergency service zones.
8. The system of claim 1 wherein the first switch means includes means for mapping a telephone number of a calling party to one of said switch means.
9. The system of claim 1 wherein each of said switch means is associated with an emergency service zone.
10. The system of claim 1 wherein different emergency service zones are associated with different emergency services corresponding to a telephone number of a calling party.
11. The system of claim 10 wherein different emergency services have differing priorities in the emergency zones corresponding to a type of emergency.
12. The system of claim 1 wherein the second switch means includes means for determining the emergency service zone associated with a telephone number of a calling party.
The present invention relates to internode routing for a telephone system.
In the past, telephone systems, for example emergency or 911 telephone systems have been provided in order to route telephone calls from a caller to a Public Safety Answering Point (PSAP) in the case of an emergency. Such systems have utilized switching devices for routing the calls to the correct answering point.
Such 911 telephone service for an entire state has required multiple tandem switches, with each of the switches serving a geographical area. The state is thus divided into Emergency Service Zones (ESZ) in which some of the zones overlap two tandem service areas. The caller may originate into one 911 tandem, but the Emergency Service Agency is serviced by a second 911 tandem. Thus, it is necessary that the tandems must be capable of transferring the 911 call between them in order to properly route the telephone calls.
A principal feature of the present invention is the provision of an internode routing for an emergency telephone system.
The system of the present invention comprises, first switch means for routing telephone calls, second switch means for routing telephone calls, and means for defining emergency service zones for each of the first and second switch means.
A principal feature of the present invention is the provision of means for transferring a telephone call placed to the first switch means to the second switch means.
Another feature of the invention is that the second switch means completes the call to a public safety answering point.
Still another feature of the invention is that the call is transferred responsive to the condition that the public safety answering point is located in the emergency zone associated with the second switch means.
Thus, a feature of the invention is that the call is transferred by the system to the proper switch means.
Yet another feature of the invention is that the call may be transferred by the second switch means back to the first switch means for completion.
Still another feature of the invention is that the first switch means determines the emergency service zone of the public safety answering point.
Another feature of the invention is that the emergency service zone may be associated with either the first or second switch means.
Still another feature of the invention is that the first switch means maps the telephone number of the calling party to the emergency service zone.
Yet another feature of the invention is that the first switch means maps the telephone number of the calling party to one of the switch means.
A further feature of the invention is that different emergency zones are associated with different emergency services corresponding to the telephone number of the calling party.
Still another feature of the invention is that the different emergency services have differing priorities in the emergency zones corresponding to the type of emergency.
A feature of the invention is that the second switch means determines the emergency service zone associated with the telephone number of the calling party.
Another feature of the invention is that the second switch means determines the proper switch means to service the emergency service zone associated with the telephone number of the calling party.
A feature of the invention is that telephone calls originally placed to the second switch means may be transferred to the first switch means for completion to a public safety answering point.
Further features will become more fully apparent in the following description of the embodiments of this invention, and from the appended claims.
FIG. 1 is a block diagram of an internode routing for an emergency telephone system of the present invention, with calls being originally placed to first switch means in the system and being selectively transferred to second switch means in the system; and
FIG. 2 is a block diagram of the system of FIG. 1 with calls being selectively transferred from the second switch means to the first switch means.
Referring now to FIG. 1, there is shown an internode routing generally designated 10 for a Public Safety Calling System (PSCS) generally designated 12 in a telephone system generally designated 14, such as an emergency 911 telephone system. In a given geographical area, such as a state, a plurality of switches are provided to route the 911 telephone calls, such as a first Specialized Communication Exchange (SCX A) switch 16, and a second Specialized Communication Exchange (SCX B) switch 18. The geographic area is divided into a plurality of Emergency Service Zones (ESZ), such as zones 20 and 22 which are associated with the switches SCX A and SCX B, respectively. Thus, telephone calls which are originally placed to the first switch SCX A are usually routed to a Public Service Answering Point (PSAP) in the zone 20, while telephone calls originally placed to the second switch SCX B are usually routed to a PSAP in the zone 22.
However, there may be some overlapping of emergency services or emergency zones in actual use. Thus, for example, a calling party 24 may be located in the first emergency zone 20 while the emergency service 26, such as a police station, may be located in the zone 22, although this PSAP is physically near to the calling party 24, and has been designated to service the calling party 24. Hence, provision must be made in the emergency telephone system 14 to properly route the call of the calling party 24 in spite of the boundaries of the emergency service zones.
For this purpose, the first switch SCX A has an expanded routing table 28 which maps the telephone number of the calling party 24 to the emergency service zones 20 or 22. The routing table 28 also maps the telephone number of the calling party 24 to a particular switch, such as SCX A or SCX B. In this case, the call of the calling party 24 has been routed through a Central Office (CO) 30 in the zone 20 to the first switch SCX A although both the calling party 24 and CO 30 are located in the zone 20, while the PSAP comprising the police station 26 is located nearby in the zone 22. In this case, the routing table 28 of the first switch SCX A will determine that this emergency service 26 is located in the zone 22, and the call must be handled by the second switch SCX B due the overlapping territories and services.
Hence, the telephone call from the calling party 24 is transferred over a primary line 32 connected from the first switch SCX A to the second switch SCX B on a special port 31 for handling. In turn, a routing table 34 of the second switch SCX B determines from the telephone number of the calling party 24 that the emergency service is located in zone 22, and should be usually handled by the second switch SCX B, such that the call is routed, for example, to a PSAP 36 comprising a police station in the zone 22 where the call is answered and the call is dispatched by radio to the proper PSAP which may be the PSAP 26 if the type of emergency should be handled by the police.
However, other types of emergencies may be required, such as a fire station or ambulance, an the proper PSAP may comprise a fire station 38 which is in the emergency zone 20 associated with the first switch SCX A. In this case, the call is transferred by the second switch SCX B back to the first switch SCX A over a secondary line 40 connected between the switches. Hence, the call over the primary and secondary lines 32 and 40 may be disconnected in this case, and the call may be handled by the first switch SCX A by routing the call to the proper PSAP for servicing the calling party 24 with the appropriate emergency service 38, with the various types of emergency services having a suitable priority dependent upon the emergency service required.
Thus, in accordance with the present invention, emergency service zones are associated with different switches, and the calls are transferred between the switches in order to direct the call to the proper emergency service which services the calling party, with the switches being interconnected on primary and secondary lines in order to make such transfers of the calls.
The PSCS 12 shown in the condition that the call was originally placed to the second switch means SCX B is illustrated in FIG. 2, in which like parts have been incremented by 100 as compared to the system of FIG. 1. In this case, if the emergency service is located in a different zone from the zone of the calling party, the call is transferred by the second switch SCX B to the first switch SCX A where the call is handled for routing in the same manner in which the second switch SCX B handles overflow calls from the first switch SCX A, as previously described in connection with FIG. 1. Thus, the first switch SCX A determines which PSAP should receive the call, and determines which switch should place the call either from the first switch SCX A to the PSAP, or by routing the call back to the second switch SCX B, in a manner as previously described in FIG. 1. Thus, the originating call may be placed to either switch SCX A or SCX B, and the call is properly routed directly by the original switch or by transferring the call to the other switch. In other respects, the system of FIG. 2 operates the same as previously described in connection with FIG. 1. Of course, the geographical area may have considerably more than two switches which all cooperate in transferring calls to the correct switch in a manner as previously discussed.
US3881060 * Jun 4, 1973 Apr 29, 1975 Bell Telephone Labor Inc Emergency reporting system
US4310726 * Feb 4, 1980 Jan 12, 1982 Bell Telephone Laboratories, Incorporated Method of identifying a calling station at a call terminating facility
US4400587 * Aug 25, 1981 Aug 23, 1983 Rockwell International Corporation Overflow and diversion to a foreign switch
US4800583 * Aug 22, 1986 Jan 24, 1989 Theis Peter F Overflow call handling system
US4893325 * Sep 23, 1988 Jan 9, 1990 Rockwell International Corporation Integrated public safety answering point system
US4924491 * Nov 18, 1988 May 8, 1990 American Telephone And Telegraph Company Arrangement for obtaining information about abandoned calls
US5195126 * May 9, 1991 Mar 16, 1993 Bell Atlantic Network Services, Inc. Emergency alert and security apparatus and method
US5222125 * Sep 3, 1991 Jun 22, 1993 At&T Bell Laboratories System for providing personalized telephone calling features
US5235630 * Apr 17, 1991 Aug 10, 1993 Telident, Incorporated Emergency call station identification system and method
US5239570 * Jul 25, 1990 Aug 24, 1993 Teltone Corporation 9-1-1 Switched access system
1 E. G. DeNigris et al., "Enhanced 911: emergency calling with a plus", Mar. 1980, Bell Laboratory Record, pp. 75-79.
2 * E. G. DeNigris et al., Enhanced 911: emergency calling with a plus , Mar. 1980, Bell Laboratory Record, pp. 75 79.
US5689548 * May 21, 1996 Nov 18, 1997 Ericsson, Inc. Emergency call back using MSC numbers
US5712900 * May 21, 1996 Jan 27, 1998 Ericsson, Inc. Emergency call back for roaming mobile subscribers
US5832059 * Sep 30, 1996 Nov 3, 1998 Rockwell International Corp. Call path system and method for modeling and modifying a call path of a telephone call routed by a telephone switch
US5862201 * Sep 12, 1996 Jan 19, 1999 Simplex Time Recorder Company Redundant alarm monitoring system
US6067356 * Sep 17, 1998 May 23, 2000 Alcatel Method of routing emergency calls
US6175344 Aug 12, 1998 Jan 16, 2001 Futaba Denshi Kogyo Kabushiki Kaisha Field emission image display and method of driving the same
US7103151 May 29, 2002 Sep 5, 2006 Mci, Llc Telephone system and method for reliable emergency services calling
US7177397 Mar 24, 2004 Feb 13, 2007 Intrado Inc. Geographic routing of emergency service call center emergency calls
US7573982 * Oct 12, 2004 Aug 11, 2009 Bellsouth Intellectual Property Corporation Methods and systems for managing a call session
US7680252 Oct 24, 2005 Mar 16, 2010 Aztek Engineering, Inc. Switch proxy for providing emergency stand alone service in remote access systems
US7953210 Jun 27, 2006 May 31, 2011 Aztek Engineering, Inc. Switch proxy for providing emergency stand-alone service in remote access systems
US8462915 Aug 10, 2009 Jun 11, 2013 At&T Intellectual Property I, L.P. Methods and systems for managing a call session
US8515019 Oct 15, 2009 Aug 20, 2013 Verizon Business Global Llc Telephone system and method for reliable emergency services calling
US9060076 Jun 10, 2013 Jun 16, 2015 At&T Intellectual Property I, L.P. Methods and systems for managing a call session
US20030109245 * Oct 21, 2002 Jun 12, 2003 Mccalmont Patti L Routing of emergency calls based on geographic location of originating telephone end office
US20030198331 * May 29, 2002 Oct 23, 2003 Worldcom, Inc. Telephone system and method for reliable emergency services calling
US20040184584 * Mar 24, 2004 Sep 23, 2004 Intrado Inc. Geographic routing of emergency service call center emergency calls
US20060078094 * Oct 12, 2004 Apr 13, 2006 Bellsouth Intellectual Property Corporation Methods and systems for managing a call session
US20060262907 * May 19, 2005 Nov 23, 2006 Sbc Knowledge Ventures Lp Switching public safety answering points between central offices
US20070287473 * Aug 13, 2007 Dec 13, 2007 Tracbeam Llc Platform and applications for wireless location and other complex services
US20080037461 * Apr 14, 2005 Feb 14, 2008 Biltz Gregory F System and Method for Managing Communication Interoperability Switches
US20080167049 * Apr 24, 2007 Jul 10, 2008 Tracbeam Llc Wireless location using signal fingerprinting and other location estimators
US20090048938 * Nov 7, 2007 Feb 19, 2009 Dupray Dennis J Real Estate Transaction System
US20100046722 * Oct 15, 2009 Feb 25, 2010 Verizon Business Global Llc Telephone system and method for reliable emergency services calling
US20100234045 * May 24, 2010 Sep 16, 2010 Tracbeam Llc System and method for hybriding wireless location techniques
WO1997048247A2 * May 19, 1997 Dec 18, 1997 Siemens Business Communication Systems, Inc. A method for allowing a mobile phone to receive a call through a wireless network for which it is not registered, for emergency purposes
WO1997048247A3 * May 19, 1997 Feb 26, 1998 Rolm Systems A method for allowing a mobile phone to receive a call through a wireless network for which it is not registered, for emergency purposes
WO2003090436A1 * Apr 15, 2003 Oct 30, 2003 Worldcom, Inc. Telephone system and method for reliable emergency services calling
U.S. Classification 379/45, 379/221.01, 379/48
International Classification H04M11/04, H04M7/00, H04Q3/00
Cooperative Classification H04M7/00, H04Q3/0016, H04M11/04
European Classification H04Q3/00D, H04M11/04
Dec 15, 1992 AS Assignment
Owner name: ROCKWELL INTERNATIONAL CORPORATION, CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:MULROW, ROBERT J.;JESTER, DONALD J.;REEL/FRAME:006353/0760
Aug 25, 1998 FPAY Fee payment
Aug 25, 1998 SULP Surcharge for late payment
Feb 22, 2002 FPAY Fee payment
Aug 23, 2004 AS Assignment
Owner name: ROCKWELL ELECTRONIC COMMERCE TECHNOLOGIES, LLC, IL
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ROCKWELL INTERNATIONAL CORPORATION;REEL/FRAME:015017/0430
Free format text: SECURITY INTEREST;ASSIGNOR:FIRSTPOINT CONTACT TECHNOLOGIES, LLC;REEL/FRAME:016769/0605
Owner name: D.B. ZWIRN FINANCE, LLC, AS ADMINISTRATIVE AGENT,
Free format text: SECURITY AGREEMENT;ASSIGNOR:FIRSTPOINT CONTACT TECHNOLOGIES, LLC;REEL/FRAME:016784/0838
Owner name: D.B. ZWIRN FINANCE, LLC, AS ADMINISTRATIVE AGENT,N
Feb 8, 2006 FPAY Fee payment
Jun 22, 2006 AS Assignment
Owner name: FIRSTPOINT CONTACT TECHNOLOGIES, LLC, ILLINOIS
Free format text: CHANGE OF NAME;ASSIGNOR:ROCKWELL ELECTRONIC COMMERCE TECHNOLOGIES, LLC;REEL/FRAME:017823/0539
Owner name: FIRSTPOINT CONTACT TECHNOLOGIES, LLC,ILLINOIS