CA2487656A1 - Emergency call handling in a voice-over-packet environment - Google Patents

Emergency call handling in a voice-over-packet environment Download PDF

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Publication number
CA2487656A1
CA2487656A1 CA002487656A CA2487656A CA2487656A1 CA 2487656 A1 CA2487656 A1 CA 2487656A1 CA 002487656 A CA002487656 A CA 002487656A CA 2487656 A CA2487656 A CA 2487656A CA 2487656 A1 CA2487656 A1 CA 2487656A1
Authority
CA
Canada
Prior art keywords
call
emergency
directory number
emergency call
routing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002487656A
Other languages
French (fr)
Other versions
CA2487656C (en
Inventor
William Crago
Hakem M. Habib
Marie Berthe Barbara Wilkes
Bernard Brabant
Guy Caron
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BCE Inc
Original Assignee
BCE Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BCE Inc filed Critical BCE Inc
Priority to PCT/CA2005/001459 priority Critical patent/WO2006039783A1/en
Publication of CA2487656A1 publication Critical patent/CA2487656A1/en
Application granted granted Critical
Publication of CA2487656C publication Critical patent/CA2487656C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/50—Centralised arrangements for answering calls; Centralised arrangements for recording messages for absent or busy subscribers ; Centralised arrangements for recording messages
    • H04M3/51—Centralised call answering arrangements requiring operator intervention, e.g. call or contact centers for telemarketing
    • H04M3/5116—Centralised call answering arrangements requiring operator intervention, e.g. call or contact centers for telemarketing for emergency applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/04—Telephonic communication systems specially adapted for combination with other electrical systems with alarm systems, e.g. fire, police or burglar alarm systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H04M7/128—Details of addressing, directories or routing tables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6481—Speech, voice
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2242/00—Special services or facilities
    • H04M2242/14—Special services or facilities with services dependent on location

Abstract

A method of routing an emergency call received at a network element. The method comprises determining a directory number associated with a communication device having originated the emergency call, consulting a local database to obtain routing information associated with the directory number, and directing the call and the routing information over a path dedicated to emergency calls. Also, a network element which comprises the database as well as a control entity, the control entity being operative for receiving an incoming call originated by one of the communication devices, determining the directory number associated with the communication device having originated the call, determining whether the call is an emergency call and, responsive to the call being an emergency call, accessing the database to obtain the routing information related to the directory number and directing the call as well as the routing information over a trunk group dedicated to emergency calls.

Claims (25)

1. A method of routing an emergency call received at a network element, comprising:

~ determining a directory number associated with a communication device having originated the emergency call;
~ consulting a local database to obtain routing information associated with the directory number; and ~ directing the call and the routing information over a path dedicated to emergency calls.
2. The method defined in claim 1, wherein the path dedicated to emergency calls includes a virtual trunk group.
3. The method defined in claim 1, wherein the path dedicated to emergency calls comprises dedicated circuit-switched lines.
4. The method defined in claim 2, wherein the path dedicated to emergency calls further comprises dedicated circuit-switched lines.
5. A network element for use in a network that provides voice-over-packet services to a plurality of communication devices, each of the communication devices being associated with a respective directory number, the network element comprising:

~ a database that relates routing keys to respective directory numbers;
~ a control entity operative for:

~ receiving an incoming call originated by one of the communication devices;
~ determining the directory number associated with the communication device having originated the call;
~ determining whether the call is an emergency call;
~ responsive to the call being an emergency call:

(i) accessing the database to obtain the routing key related to the directory number; and (ii) directing the call and the routing key obtained at (i) over a trunk group dedicated to emergency calls.
6. The network element defined in claim 5, wherein the trunk group dedicated to emergency calls is a virtual trunk group.
7. The network element defined in claim 5, wherein the control entity being operative to determine whether the call is an emergency call comprises the control entity being operative to determine whether a set of leading digits have been dialed.
8. The network element defined in claim 5, wherein the control entity being operative to determine whether the call is an emergency call comprises the control entity being operative to determine whether the set of leading digits is selected from the group consisting of "9-1-1 ", "1-1-2" and "9-9-9".
9. The network element of claim 5 being a packet switch.
10. The network element of claim 5 being a softswitch.
11. The network element of claim 5 being a multimedia communication server (MCS).
12. The network element defined in claim 5, wherein the network element is connected to a plurality of public safety answering points (PSAPs) via a dedicated emergency network, wherein the routing key related to a particular directory number associated with a particular communication device defines a route to a particular one of the PSAPs.
13. A network architecture for providing voice-over-packet services to a plurality of communication devices, each of the communication devices being associated with a respective directory number, the network architecture comprising:

(a) a packet switch;

(b) a gateway connected to the packet switch and connectable to a circuit-switched emergency network;

(c) a database that relates individual directory numbers to respective routing keys;

(d) wherein the packet switch is operative for:

~ receiving an incoming emergency call from one of the communication devices;
~ determining the directory number associated with the communication device having placed the emergency call;
~ accessing the database to obtain the routing key related to the directory number determined in the previous step;
~ directing the emergency call, the associated directory number and the associated routing key towards the gateway.
14. The network architecture defined in claim 13, wherein directing the emergency call towards the gateway is performed over a trunk group dedicated to emergency calls.
15. The network architecture defined in claim 14, wherein the trunk group dedicated to emergency calls is a virtual trunk group.
16. The network architecture defined in claim 15, the gateway being operative for:

~ receiving the incoming emergency call, the associated directory number and the associated routing key from the packet switch;

~ determining an emergency telephone number in the circuit-switched emergency network on the basis of the received routing key;

~ directing the emergency call and the associated directory number towards the emergency telephone number determined in the previous step.
17. A network architecture for providing voice-over-packet services to a plurality of communication devices, each of the communication devices being associated with a respective directory number, the network architecture comprising:

(a) a packet switch;
(b) a gateway connected to the packet switch and connectable to a circuit-switched emergency network;

(c) a database that relates individual directory numbers to respective routing keys;

(d) wherein the packet switch is operative for:

~ receiving an incoming call originated by one of the communication devices;

~ determining the directory number associated with the communication device having originated the call;

~ determining whether the call is an emergency call;

~ responsive to the call being an emergency call:

(i) accessing the database to obtain the routing key related to the directory number; and (ii) directing the call and the routing key obtained at (i) towards the gateway.
18. The network architecture defined in claim 17, wherein directing the emergency call towards the gateway is performed over a trunk group dedicated to emergency calls.
19. The network architecture defined in claim 18, wherein the trunk group dedicated to emergency calls is a virtual trunk group.
20. The network architecture defined in claim 19, the gateway being operative for:

~ receiving the incoming emergency call, the associated directory number and the associated routing key from the packet switch;

~ determining an emergency telephone number in the circuit-switched emergency network on the basis of the received routing key;

~ directing the emergency call and the associated directory number towards the emergency telephone number determined in the previous step.
21. The network architecture defined in claim 20, wherein the packet switch being operative to determine whether the call is an emergency call comprises the packet switch being operative to determine whether a set of leading digits have been dialed.
22. The network architecture defined in claim 20, wherein the packet switch being operative to determine whether the call is an emergency call comprises the packet switch being operative to determine whether the set of leading digits is selected from the group consisting of "9-1-1 ", "1-1-2" and "9-9-9".
23. The network element defined in claim 20, wherein the routing key related to a particular directory number associated with a particular communication device defines a route to a particular one of the PSAPs.
24. A computer-readable storage medium comprising instructions for execution by a computer to implement a method of routing an emergency call received at a network element, the method comprising:

~ determining a directory number associated with a communication device having originated the emergency call;

~ consulting a local database to obtain routing information associated with the directory number; and ~ directing the call and the routing information over a path dedicated to emergency calls.
25. A computer-readable storage medium comprising computer-readable program code for execution by a computer in a network element upon receipt of an emergency call, the computer-readable program code comprising:

~ computer-readable program code for determining a directory number associated with a communication device having originated an emergency call;

~ computer-readable program code for consulting a local database to obtain routing information associated with the directory number; and ~ computer-readable program code for directing the call and the routing information over a path dedicated to emergency calls.
CA2487656A 2004-10-13 2004-11-12 Emergency call handling in a voice-over-packet environment Active CA2487656C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CA2005/001459 WO2006039783A1 (en) 2004-10-13 2005-09-23 Emergency services provisioning and emergency call handling in a voice-over-packet environment

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US61765604P 2004-10-13 2004-10-13
US60/617,656 2004-10-13

Publications (2)

Publication Number Publication Date
CA2487656A1 true CA2487656A1 (en) 2006-04-13
CA2487656C CA2487656C (en) 2010-07-13

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Family Applications (2)

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CA2487656A Active CA2487656C (en) 2004-10-13 2004-11-12 Emergency call handling in a voice-over-packet environment
CA2487700A Active CA2487700C (en) 2004-10-13 2004-11-12 Provisioning of emergency services in a voice-over-packet environment

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA2487700A Active CA2487700C (en) 2004-10-13 2004-11-12 Provisioning of emergency services in a voice-over-packet environment

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US (3) US7953209B2 (en)
CA (2) CA2487656C (en)

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Also Published As

Publication number Publication date
US20060077961A1 (en) 2006-04-13
CA2487700A1 (en) 2006-04-13
CA2487656C (en) 2010-07-13
US7801282B2 (en) 2010-09-21
US20060078095A1 (en) 2006-04-13
US7079627B2 (en) 2006-07-18
CA2487700C (en) 2010-03-16
US7953209B2 (en) 2011-05-31
US20060229059A1 (en) 2006-10-12

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