WO1996025013A1 - Telecommunications system - Google Patents

Telecommunications system Download PDF

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Publication number
WO1996025013A1
WO1996025013A1 PCT/GB1996/000303 GB9600303W WO9625013A1 WO 1996025013 A1 WO1996025013 A1 WO 1996025013A1 GB 9600303 W GB9600303 W GB 9600303W WO 9625013 A1 WO9625013 A1 WO 9625013A1
Authority
WO
WIPO (PCT)
Prior art keywords
network
switch
private
call
signalling
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.)
Ceased
Application number
PCT/GB1996/000303
Other languages
French (fr)
Inventor
Mark Ashworth
Iain Alexander Donaldson
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.)
Nortel Networks Ltd
Original Assignee
Northern Telecom Ltd
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 Northern Telecom Ltd filed Critical Northern Telecom Ltd
Priority to US08/875,473 priority Critical patent/US6075852A/en
Priority to DE69612961T priority patent/DE69612961T2/en
Priority to EP96902343A priority patent/EP0808546B1/en
Publication of WO1996025013A1 publication Critical patent/WO1996025013A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
    • H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/0029—Provisions for intelligent networking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13097—Numbering, addressing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13103—Memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13176—Common channel signaling, CCS7
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13282—Call forward, follow-me, call diversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13345—Intelligent networks, SCP
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1338—Inter-exchange connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13384—Inter-PBX traffic, PBX networks, e.g. corporate networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13541—Indexing scheme relating to selecting arrangements in general and for multiplex systems routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13547—Indexing scheme relating to selecting arrangements in general and for multiplex systems subscriber, e.g. profile, database, database access

Definitions

  • This invention relates to telecommunications, e g telephone systems and in particular to systems incorporating one or more private networks
  • a conventional telecommunications private network comprises a number of private exchanges or switches (PBX's) interconnected via private telephone lines and each of which serves a number of telephone or user terminals
  • PBX's private exchanges or switches
  • the PBX's of the private system are interconnected by private leased lines which are installed by the appropriate telephone service supplier Call routing and call handling within the private network are controlled via the PBX's
  • POTS basic telephony service
  • a private network is generally required to provide additional features such as call forwarding, call transfer, ring-back when free and conference calls
  • a further service that is finding increasing usage is that of providing a direct dialling facility to telephone extensions attached to a PBX
  • the CENTREX system provides such a service
  • a telecommunications system incorporating a switch based private network having a transparent network signalling system and having a plurality of nodes interfacing each via a switch with an intelligent public network communication in use being effected between the nodes via the public network
  • the public network incorporates a service control point having associated therewith a database containing destination addresses corresponding to call numbers received from the private network
  • the system is such that the database provides routing data for call independent signalling information in response to requests from a said node on behalf of a private service provided to a user of that node and from a public network switch on behalf of a private service provided to a directly connected user of that switch, wherein a call forwarding facility is provided, and wherein said database has means responsive to an indication from the network that a signalling transaction is call independent for inhibiting the call forwarding facility for that transaction.
  • a method of routing call independent signalling information in telecommunications system incorporating a switch based private network having a transparent network signalling system and having a plurality of nodes interfacing each via a switch with an intelligent public network controlled by a service control point having a database associated therewith, the method including sending to the database requests for call independent signalling information from a said node on behalf of a private service provided to a user associated with that node or from a said switch on behalf of a private service provided to a user directly connected to that switch, providing from the database network destination information responsive to said requests, and suppressing call forwarding information for destination information requests relating to a said call independent signalling transaction.
  • Routing of calls within the public network is effected using switch and trunk identifiers and not subscriber numbers.
  • the arrangement permits the routing of private network virtual calls, i.e. call independent signalling connections requested by a connected private network node.
  • the feature transparency is split into two aspects, these are the call related transparency of real calls and the call independent transparency of virtual calls.
  • Fig. 1 is a schematic diagram of a telecommunications system according to the invention.
  • Fig. 2 is a schematic diagram of a service control point for use in the system of Fig. 1.
  • the telecommunications system includes a public network comprising a plurality of nodes or switching centres 1 1 at least some of which are associated with a corresponding plurality of public network subscriber terminals 1 10. Some of the switching centres 11 also provide an interface between corresponding private network nodes 21 and the public network. Each private network node 21 may in turn service a number of private network terminals 210.
  • the private network incorporates a signalling system that has transparency on a fundamental part.
  • the signalling system may be, for example, DPNSS or QSIG. This signalling system provides the private network with service/feature facilities that are not necessarily provided by the public network.
  • a switch 1 1 may also support individual private network customers 21 1 directly rather than via a PBX.
  • a service control point (SCP) 31 incorporating a database and services are provided via interaction of the switch 1 1 with the SCP.
  • the switch 1 1 requests the database via the SCP 31 for the destination address of all calls made on the network so that the full numbering plan and routing table is stored in the database.
  • the routing is effected using switch and trunk identifiers rather than numbers. Therefore, virtual calls, i.e. call independent signalling connections requested by a connected private switch, have to be routed under the control of the SCP.
  • the SCP 31 also provides a map for the translation of relevant private call signalling information to corresponding public network signalling information.
  • the switch based private network is not required to have the intelligent network capabilities of the public network and is provided with its own private numbering/routing plan.
  • the private network does however have a signalling system that has transparency as a fundamental part, e.g. the DPNSS or
  • the public network provides a
  • VPN virtual private network
  • the public network uses its intelligence as an integral or an exclusive means to determine network destinations and provides transparency based e.g. on DFT (DPNSS feature transparency).
  • DFT DFT feature transparency
  • the SCP and its associated database respond to queries for routing of call independent signalling information from requests for signalling information received from a connected PBX (directly or indirectly) on behalf of a private service provided to a user on that PBX, and form a public switch on behalf of a private service provided to a directly connected user on that switch.
  • This encompasses both connectionless (packet) and connection oriented signalling information that is independent of a call.
  • the network informs the SCP of the nature of the query.
  • the database then avoids treating the destination address in the same manner as that for a subscriber, i.e. the address would not be subject to call forwarding settings should it coincide with a real address of a user whose call forwarding is active.
  • the service may be billed to the private network operator, who for this purpose can be considered as a public network customer, in a number of ways, including per octet/bit of signalling information carried, per signalling packet carried (independent of length up to a network supportable maximum), on a rental basis, or on a call (for call related) or connection (for call independent) basis.
  • the billing may be indicated by the database in response to the initial enquiry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Telephonic Communication Services (AREA)

Abstract

A telecommunications system incorporates a switch based private network having a transparent network signalling system and having a plurality of nodes interfacing each via a switch with an intelligent public network. The public network incorporates a service control point having associated therewith a database containing destination addresses corresponding to call numbers received from the private network. The database provides routing data for call independent signalling information in response to requests from a node on behalf of a private service provided to a user of that node and from a public network switch on behalf of a private service provided to a directly connected user of that switch.

Description

TELECOMMUNICATIONS SYSTEM
This invention relates to telecommunications, e g telephone systems and in particular to systems incorporating one or more private networks
A conventional telecommunications private network comprises a number of private exchanges or switches (PBX's) interconnected via private telephone lines and each of which serves a number of telephone or user terminals The PBX's of the private system are interconnected by private leased lines which are installed by the appropriate telephone service supplier Call routing and call handling within the private network are controlled via the PBX's
In addition to a basic telephony service (POTS) a private network is generally required to provide additional features such as call forwarding, call transfer, ring-back when free and conference calls These features are not in general provided on a public network as they are specific requirements of business rather than domestic subscribers
A further service that is finding increasing usage is that of providing a direct dialling facility to telephone extensions attached to a PBX For example the CENTREX system provides such a service
An approach to the problem of integrating public and private networks is described in specification No WO 93/15583 which relates to a method of providing system and network independent dedicated private circuit telecommunications functionality using separate signalling and transmission network bearers The provision of private leased lines represents a significant capital investment by the telephone service supplier Furthermore these leased lines represent an underused asset as they are in significant use, for only a part, typically about one third, of the twenty four hour cycle However, during their idle period, these lines are not available to carry telephone traffic, e.g. to reduce an overload, for subscribers other than the private user to whom the lines have been leased Expansion of the network is also difficult, as new dedicated lines have to be provided for new business subscribers
Various workers have addressed this problem by providing systems in which a private network comprises a number of local networks interconnected by non-dedicated public network paths This however introduces the problem that certain features provided on the private network may not be available on the public network and there is thus a need to provide feature transparency for private network calls routed across the public network, i e to provide private network users with the perception that their network comprises a single seamless network
An object of the invention is to minimise or to overcome the above disadvantage
It is a further object of the invention to provide a system in which calls between private network users are routed via a public network while providing private network feature transparency
According to the invention there is provided a telecommunications system incorporating a switch based private network having a transparent network signalling system and having a plurality of nodes interfacing each via a switch with an intelligent public network communication in use being effected between the nodes via the public network, wherein the public network incorporates a service control point having associated therewith a database containing destination addresses corresponding to call numbers received from the private network, and wherein the system is such that the database provides routing data for call independent signalling information in response to requests from a said node on behalf of a private service provided to a user of that node and from a public network switch on behalf of a private service provided to a directly connected user of that switch, wherein a call forwarding facility is provided, and wherein said database has means responsive to an indication from the network that a signalling transaction is call independent for inhibiting the call forwarding facility for that transaction.
According to a further aspect of the invention there is provided a method of routing call independent signalling information in telecommunications system incorporating a switch based private network having a transparent network signalling system and having a plurality of nodes interfacing each via a switch with an intelligent public network controlled by a service control point having a database associated therewith, the method including sending to the database requests for call independent signalling information from a said node on behalf of a private service provided to a user associated with that node or from a said switch on behalf of a private service provided to a user directly connected to that switch, providing from the database network destination information responsive to said requests, and suppressing call forwarding information for destination information requests relating to a said call independent signalling transaction.
Routing of calls within the public network is effected using switch and trunk identifiers and not subscriber numbers. The arrangement permits the routing of private network virtual calls, i.e. call independent signalling connections requested by a connected private network node.
The feature transparency is split into two aspects, these are the call related transparency of real calls and the call independent transparency of virtual calls.
An embodiment of the invention will now be described with reference to the accompanying drawings in which - Fig. 1 is a schematic diagram of a telecommunications system according to the invention.
Fig. 2 is a schematic diagram of a service control point for use in the system of Fig. 1.
Referring to the drawings, the telecommunications system includes a public network comprising a plurality of nodes or switching centres 1 1 at least some of which are associated with a corresponding plurality of public network subscriber terminals 1 10. Some of the switching centres 11 also provide an interface between corresponding private network nodes 21 and the public network. Each private network node 21 may in turn service a number of private network terminals 210. The private network incorporates a signalling system that has transparency on a fundamental part. The signalling system may be, for example, DPNSS or QSIG. This signalling system provides the private network with service/feature facilities that are not necessarily provided by the public network. A switch 1 1 may also support individual private network customers 21 1 directly rather than via a PBX.
In the intelligent network outlined above, certain functions , e.g. the addressing capabilities of the network are centralised in a service control point (SCP) 31 incorporating a database and services are provided via interaction of the switch 1 1 with the SCP. In this arrangement, the switch 1 1 requests the database via the SCP 31 for the destination address of all calls made on the network so that the full numbering plan and routing table is stored in the database. The routing is effected using switch and trunk identifiers rather than numbers. Therefore, virtual calls, i.e. call independent signalling connections requested by a connected private switch, have to be routed under the control of the SCP. In addition to providing call routing information, the SCP 31 also provides a map for the translation of relevant private call signalling information to corresponding public network signalling information.
In the arrangement of Figure 1 , the switch based private network is not required to have the intelligent network capabilities of the public network and is provided with its own private numbering/routing plan. The private network does however have a signalling system that has transparency as a fundamental part, e.g. the DPNSS or
QSIG standard, which uses call independent signalling as part of the service/feature requirements. The public network provides a
VPN (virtual private network) service to private switches and may have directly connected business subscribers who require feature functionality towards private switches from the same customer. The public network uses its intelligence as an integral or an exclusive means to determine network destinations and provides transparency based e.g. on DFT (DPNSS feature transparency).
The SCP and its associated database respond to queries for routing of call independent signalling information from requests for signalling information received from a connected PBX (directly or indirectly) on behalf of a private service provided to a user on that PBX, and form a public switch on behalf of a private service provided to a directly connected user on that switch. This encompasses both connectionless (packet) and connection oriented signalling information that is independent of a call. For call independent signalling transactions, the network informs the SCP of the nature of the query. As a result, the database then avoids treating the destination address in the same manner as that for a subscriber, i.e. the address would not be subject to call forwarding settings should it coincide with a real address of a user whose call forwarding is active.
The service may be billed to the private network operator, who for this purpose can be considered as a public network customer, in a number of ways, including per octet/bit of signalling information carried, per signalling packet carried (independent of length up to a network supportable maximum), on a rental basis, or on a call (for call related) or connection (for call independent) basis. The billing may be indicated by the database in response to the initial enquiry.

Claims

CLAIMS:
1. A telecommunications system incorporating a switch based private network having a transparent network signalling system and having a plurality of nodes interfacing each via a switch with an intelligent public network, communication in use being effected between the nodes via the public network, wherein the public network incorporates a service control point having associated therewith a database containing destination addresses corresponding to call numbers received from the private network, and wherein the system is such that the database provides routing data for call independent signalling information in response to requests from a said node on behalf of a private service provided to a user of that node and from a public network switch on behalf of a private service provided to a directly connected user of that switch, wherein a call forwarding facility is provided, and wherein said database has means responsive to an indication from the network that a signalling transaction is call independent for inhibiting the call forwarding facility for that transaction.
2. A telecommunications system as claimed in claim 1 , wherein said private network has a signalling system comprising a DPNSS or a QSIG protocol.
3. A method of routing call independent signalling information in telecommunications system incorporating a switch based private network having a transparent network signalling system and having a plurality of nodes interfacing each via a switch with an intelligent public network controlled by a service control point having a database associated therewith, the method including sending to the database requests for call independent signalling information from a said node on behalf of a private service provided to a user associated with that node or from a said switch on behalf of a private service provided to a user directly connected to that switch, providing from the database network destination information responsive to said requests, and suppressing call forwarding information for destination information requests relating to a said call independent signalling transaction.
4. A method as claimed in claim 3, wherein routing is determined by switch and trunk identifiers.
PCT/GB1996/000303 1995-02-10 1996-02-09 Telecommunications system Ceased WO1996025013A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US08/875,473 US6075852A (en) 1995-02-10 1996-02-09 Telecommunications system and method for processing call-independent signalling transactions
DE69612961T DE69612961T2 (en) 1995-02-10 1996-02-09 TELECOMMUNICATION SYSTEM
EP96902343A EP0808546B1 (en) 1995-02-10 1996-02-09 Telecommunications system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9502634A GB2297882A (en) 1995-02-10 1995-02-10 Telecommunications system
GB9502634.0 1995-02-10

Publications (1)

Publication Number Publication Date
WO1996025013A1 true WO1996025013A1 (en) 1996-08-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/000303 Ceased WO1996025013A1 (en) 1995-02-10 1996-02-09 Telecommunications system

Country Status (5)

Country Link
US (1) US6075852A (en)
EP (1) EP0808546B1 (en)
DE (1) DE69612961T2 (en)
GB (1) GB2297882A (en)
WO (1) WO1996025013A1 (en)

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US10361802B1 (en) 1999-02-01 2019-07-23 Blanding Hovenweep, Llc Adaptive pattern recognition based control system and method
WO1998021904A1 (en) * 1996-11-11 1998-05-22 British Telecommunications Public Limited Company Telecommunications networks
EP0876067A1 (en) * 1997-04-30 1998-11-04 Alcatel Virtual private networks with common destination
DE19720086A1 (en) * 1997-05-14 1998-11-19 Alsthom Cge Alcatel Subscriber line network, switching center, service control device and connection establishment method
US6557044B1 (en) 1999-06-01 2003-04-29 Nortel Networks Limited Method and apparatus for exchange of routing database information
FI109316B (en) * 1999-08-03 2002-06-28 Nokia Corp Procedure and system for performing operator services in a telecommunications system
WO2001041460A1 (en) * 1999-12-01 2001-06-07 Nokia Corporation Signaling method and network element for a virtual private network
EP1236362B1 (en) * 1999-12-01 2010-06-02 Nokia Corporation Providing gateway functionality in a virtual private network
WO2002005061A2 (en) 2000-07-06 2002-01-17 David Paul Felsher Information record infrastructure, system and method
US7181017B1 (en) 2001-03-23 2007-02-20 David Felsher System and method for secure three-party communications
US9818136B1 (en) 2003-02-05 2017-11-14 Steven M. Hoffberg System and method for determining contingent relevance
US20050195802A1 (en) * 2004-02-20 2005-09-08 Klein Mark D. Dynamically routing telephone calls
US8874477B2 (en) 2005-10-04 2014-10-28 Steven Mark Hoffberg Multifactorial optimization system and method
US7953866B2 (en) * 2006-03-22 2011-05-31 Mcdata Corporation Protocols for connecting intelligent service modules in a storage area network

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EP0398183A2 (en) * 1989-05-17 1990-11-22 Nortel Networks Corporation Carrier independent network services
WO1993015583A1 (en) * 1992-01-24 1993-08-05 Gpt Limited Speech/signalling overlay
WO1993017515A1 (en) * 1992-02-28 1993-09-02 Bell Atlantic Network Services, Inc. Area wide centrex
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JPH06500912A (en) * 1991-06-28 1994-01-27 テレフオンアクチーボラゲツト　エル　エム　エリクソン Modular construction applications in telecommunications exchanges
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WO1993015583A1 (en) * 1992-01-24 1993-08-05 Gpt Limited Speech/signalling overlay
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WO1995001691A1 (en) * 1993-07-02 1995-01-12 At & T Corp. Telecommunications follow me services

Also Published As

Publication number Publication date
GB2297882A (en) 1996-08-14
EP0808546B1 (en) 2001-05-23
GB9502634D0 (en) 1995-03-29
EP0808546A1 (en) 1997-11-26
DE69612961T2 (en) 2001-09-20
DE69612961D1 (en) 2001-06-28
US6075852A (en) 2000-06-13

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