WO1998021903A1 - Reseaux de telecommunications - Google Patents

Reseaux de telecommunications Download PDF

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Publication number
WO1998021903A1
WO1998021903A1 PCT/GB1997/003041 GB9703041W WO9821903A1 WO 1998021903 A1 WO1998021903 A1 WO 1998021903A1 GB 9703041 W GB9703041 W GB 9703041W WO 9821903 A1 WO9821903 A1 WO 9821903A1
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WO
WIPO (PCT)
Prior art keywords
public
private
party number
parameter
calling party
Prior art date
Application number
PCT/GB1997/003041
Other languages
English (en)
Inventor
Frank Richard Allard
Original Assignee
British Telecommunications Public Limited Company
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 British Telecommunications Public Limited Company filed Critical British Telecommunications Public Limited Company
Priority to AU48756/97A priority Critical patent/AU4875697A/en
Priority to JP52227798A priority patent/JP2001504293A/ja
Publication of WO1998021903A1 publication Critical patent/WO1998021903A1/fr

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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

Definitions

  • the present invention relates to methods of signalling in telecommunications networks, and to networks employing such methods.
  • Organisations of medium or large size commonly operate private telecommunications networks.
  • PBXs private branch exchanges
  • PTOs public telecommunications operators
  • VPNs virtual private networks
  • Individuals within an organisation which uses a private or virtual private network will generally have two telephone numbers, one "public" number for use by callers from outside the organisation, and one private number for use within the private network.
  • a method of operating a telecommunications network including: a) at a calling party, setting a value of a calling party number public/private parameter b) transmitting on a signalling channel from a first network node which is connected to the calling party to a second network node which is connected to a called party: a public calling party number, a private calling party number, and the calling party number public/private parameter; and, c) at the second node, forwarding to the called party either the public calling party number or the private calling party number depending on the value of the calling party number public/private parameter.
  • the public/private parameter may be set by the calling party on a per call basis, for example by the dialling of a predetermined code at the terminal of the user.
  • the parameter may be set on a per site basis, for example by the system administrator of the PBX at the calling party site programming a selected value of the public/private parameter to be used for all calls from the PBX. It will be understood that all references herein to the setting of the public/private parameter by the calling party encompass both such possibilities.
  • the present invention provides for the first time a system in which the user is given control over which of a private network number and a public network number are made available to the called party. This significantly enhances the functionality of network, and is of particular value in a public network used to support a VPN.
  • the invention may be used, for example, in conjunction with a supplementary service such as Completion of Call to Busy Subscribers (CCBS).
  • CCBS Completion of Call to Busy Subscribers
  • the originating caller can determine whether the call is completed using the private network or using the public network.
  • the public/private parameter may be used to control other services which make use of the CLI.
  • node encompasses both local exchanges in the core network and PBX's which are connected to the core network via an access network.
  • the second node may be a PBX connected directly to the called party.
  • the access network does not support the inclusion of two CLI numbers in the signalling channel, for example if the access network uses standard DSS1 (Digital Signalling System no. 1 )
  • DSS1 Digital Signalling System no. 1
  • the second node is the local exchange, which selects the appropriate one of the numbers for forwarding to the PBX and at the same time strips off the public/private parameter.
  • the signalling channel may be carried within the public network using ISDN user part (ISUP) signalling.
  • ISUP ISDN user part
  • one of the private CLI and the public CLI is encapsulated for transmission in the signalling channel between the first node and the second node.
  • This preferred feature of the invention allows both numbers to be transported across the network, without requiring significant modification of the network signalling protocols. This is achieved by encapsulating one of the numbers, for example within the data field of a transport parameter.
  • a method of operating a telecommunications network including: a) at a calling party, setting a value of a called party number (CdPN) public/private parameter; b) transmitting on a signalling channel from a first network node which is connected to the calling party to a second network node which is connected to a called party a public called party number, a private called party number, and the called party number (CdPN) public/private parameter; and, c) in an access network which is connected to one or other of the first and second network nodes, routing the call using either the public called party number or the private called party number depending on the value of the CdPN public private parameter.
  • CdPN called party number
  • This aspect of the present invention gives the user control over the manner in which a call is to be routed.
  • the signalling channel carries both a public called party number and a private called party number.
  • a public/private parameter is then set to determine which is to be used in routing the call.
  • the method of the second aspect may be used independently of the method of the first aspect, it is very much preferred that the two aspects should be used in combination.
  • a single multi-bit parameter is transmitted on the signalling channel, with different bits of the multi-bit parameter being flags for the CLI public/private parameter and the CdPN public/private parameter respectively.
  • the present invention also encompasses networks configured to operate in accordance with the first and/or second aspects described above, switches and signalling apparatus such as PBX's and Local Exchanges in such networks, and network signalling incorporating public/private parameters as defined herein.
  • Figure 1 is a diagram showing a network embodying the present invention
  • Figure 2 is a diagram showing the format of a public/private parameter transmitted on a signalling channel in the network of Figure 1 ;
  • FIG. 3 is a diagram showing the QSIG protocol stack
  • Figure 4 is a diagram showing the format of an APP transport parameter
  • Figure 5 is a call flow diagram
  • Figure 6 shows a software architecture for implementing the network of
  • Figure 7 shows platforms for implementing the network of Figure 1 ;
  • FIG 8 is a flow diagram for elements of the software of Figure 6.
  • a telecommunications system comprises a core network 1 .
  • Customer terminals 2a, 2b are connected by local exchanges LE1 , LE2 and access networks 3, 4 to the core network 1 .
  • the access network for the first local exchange LE1 supports a QSIG ( Q interface SIGnalling protocol) signalling channel between the local exchange LE1 and a PBX 5. More specifically, the channel uses the ISO version of QSIG known as PSS1 (Private Signalling System no. 1 ).
  • the access network for the second local exchange LE2 supports a DSS1 (Digital Signalling System no. 1 ) signalling protocol, augmented by an application transport parameter APP, as will be further described below.
  • a PBX 6 is connected to the second local exchange LE2 via the access network.
  • signalling is carried using ISUP (ISDN user part) signalling channels.
  • the ISUP signalling incorporates APP parameters which are used to envelope features of the local access signalling channels in order to transport them transparently across the network.
  • the core network is used to implement a virtual private network VPN which incorporates the two PBXs, and which has its own private numbering scheme.
  • the PBXs and customer terminal equipment connected to the PBX's have public telephone numbers.
  • the first PBX opens a QSIG signalling channel to the local exchange LE1 .
  • This uses the conventional QSIG protocol for establishing and progressing the call, other than in that a public/private parameter is passed to the local exchange LE1 .
  • Figure 3 illustrates the conventional QSIG protocol stack. Because the signalling interface is defined with reference to a logical reference point, the protocol stack can be implemented for different physical interfaces including both copper wire and optical fibre.
  • Figure 2 shows the format of the public/private parameter which is included in layer 3a of the protocol stack.
  • the data passed on the signalling channel to the local exchange LE2 may include, for example, the private number of the called party.
  • the first PBX inserts in the signalling stream the PPP parameter. As shown in the Figure, this is an eight bit parameter. In this instance, bit 2 has its value set to indicate that the calling party has chosen routing on the private CdPN (called party number).
  • the private CdPN received from the PBX is translated to a corresponding public number. This is carried publicly in the ISUP signalling and is used to route the call through the core network.
  • the private number, and the PPP parameter are not used within the core network, but are transported through the network using an APP parameter in the ISUP signalling.
  • Figure 4 shows the format of the APP parameter.
  • This parameter represents an addition to ISUP which can be used to carry QSIG information elements (IE) and any other application-specific data.
  • the Application Context Identifier field is used to identify the nature of the encapsulated data. In this case the data is the PPP parameter and the private CdPN. The data itself is then carried in bytes 4a to 4n of the parameter. This data is delivered transparently through the ISUP channel across the core network to the destination local exchange LE2.
  • the manner in which the PPP parameter and the associated data are used depends on the capabilities of the signalling channel which links the local exchange to the destination PBX.
  • the access network may use conventional DSS1 signalling. This supports routing on private numbers, but only supports a limited range of Additional Network Functions, and in particular could not accommodate the PPP parameter.
  • the destination local exchange is responsible for stripping out the PPP parameter and passing to the PABX via the DSS1 signalling channel the chosen CdPN, that is the private CdPN.
  • the destination exchange also chooses the appropriate one of the private and public CLIs (calling line identities) of the calling party and forwards this as the CLI to the PBX.
  • the selection of which of the public and private CLI's is to be made available is determined by bits 3 and 4 of the PPP parameter written by the originating PBX.
  • the signalling channel in the local access network of the destination local exchanged is enhanced to support the transfer of the PPP and related data.
  • the signalling protocol is modified by the addition of the APP transport parameter which was described above in relation to its use in ISUP signalling channel in the core network.
  • the significant property of the modified DSS1 protocol is that it allows transmission of the PPP parameter and associated data through the access network to the terminating PBX.
  • the PPP and the associated data are transmitted within the data field of the APP transport parameter.
  • the terminating PBX then reads the PPP data, and delivers either the public CLI or the private CLI to the terminal of the called party, depending on the value of bits 3 and 4 in the private/public parameter.
  • Figure 5 shows the call flows on the signalling channels between the different switches in the example described above.
  • a SETUP message is passed from the originating PBX to the first local exchange which generates and forwards an intial address message.
  • a circuit for the voice or data call is established between the Calling and Called parties. It is assumed that within the core network, the call between the originating local exhcnage and the destination exchange is routed via a transit exchange TE.
  • the parameters shown shaded are carried via the Application Transport Parameter APP. It can be seen that these include the Calling Party and Called Party subaddresses, and also the PPP parameter.
  • the APP parameter is used in the SETUP message, it may also be used in other contexts, for example in ALERT, RELEASE COMPLETE, CONNECT and DISCONNECT messages.
  • FIG. 6 illustrates the architecture of the software used to implement the invention in this example.
  • VPN processing modules are interfaced via call control modules to signalling interfaces.
  • additional call control procedures are added to the VPN module.
  • These additional features implement two functions: 1 ) translation of private numbers into public Calling and Called party numbers; 2)enveloping of private numbers into the Application Transport Parameter (app).
  • Figure 8 is a flow diagram illustrating the implementation of these additional call features.
  • step S1 the incoming private number is read.
  • step S2 this is used to address a look-up table which is stored locally at the exchange and which maps private numbers to the public numbering system used by the core network. If at stage S3 no corresponding public number is found, then the procedure terminates.
  • the public number is written into the CdPN ISUP field.
  • the private CdPN is written into the data field of the APP in setep S6.
  • the Application Context Identifier of the APP is set in S7 to indicate that the parameter contains QSIG data.
  • the procedure ends at S8, at which point the VPN reverts to the conventional call setup procedure.
  • the transit exchange merely forwards all received information.
  • additional functions in the VPN map parameters received onto their equivalents in the outgoing DSS1 APP channel Without the use of the APP parameter in the DSS1 APP channel, it would be necessary to discard the private enveloped parameters received at the destination exchange.
  • the APP parameter can also carry a specific CAUSE value which indicates why a call has been released.
  • Different CAUSE values apply to the core and access networks. Conventionally when a call is released by the active network, then if a directly corresponding cause does not exist within the core network, it has been necessary to map the actual CAUSE value onto the closest similar CAUSE value provided for by the core network signalling protocol. Using the APP parameter allows the true access network CAUSE value to be transported across the network to another access network and PBX, where it can be interpreted appropriately.
  • Figure 7 shows a physical architecture to support the functions described above.
  • the PBX or "PINX” may be, for example a device such as that available commercially from NORTEL as a Meridian M 1 PBX, and the local and transit exchanges may comprise digital exchanges such as those available commercially form Ericsson as AXE10 or GPT Ltd as System X, or Nortel as DMS-100.
  • the different elements have the following functions:
  • the Supplementary Service Control (SS-C) is responsible for the provision of procedures for the support of a particular supplementary service.
  • the Coordination Function provides coordination between GFT-Control, the various SS-Control entities, ROSE, ACSE, DSE and Call Control for different Supplementary services. It also provides functions to support the handling of unrecognised APDUs.
  • the Remote Operation Service Element (ROSE) is responsible for the encoding of supplementary service information provided by the SS-C, into the appropriate ROSE Application Protocol Data Unit (APDU). The ROSE APDUs are then delivered either to the GFT control or the DSE via the Co-ordination Function.
  • the Dialogue Service Element may be used to create one or more dialogues between two PTNXs or to provides services via the Co-ordination Function, so that ROSE elements not implicitly associated by a network layer connection can be explicitly associated. These services can allow ROSE APDUs to be exchanged and delivered to the GFT-Control.
  • the Association Control Service Element (ACSE) provides a set of services to establish and release an explicit Application association.
  • the Generic Functional Transport provides connection oriented, connectionless oriented and notification services to the SSC, ACSE, ROSE and DSE via the Coordination Function.

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

Abstract

L'invention concerne un réseau de télécommunications dans lequel un demandeur fixe la valeur du paramètre public/privé (PPP) du CLI (identification de la ligne appelante) qui est ensuite transmise par le réseau principal avec un numéro de CLI public et un numéro de CLI privé. Le paramètre PPP permet de déterminer celui des deux numéros qui sera remis au demandé, et de choisir un numéro de demandé privé ou public pour l'acheminement.
PCT/GB1997/003041 1996-11-11 1997-11-05 Reseaux de telecommunications WO1998021903A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU48756/97A AU4875697A (en) 1996-11-11 1997-11-05 Telecommunications networks
JP52227798A JP2001504293A (ja) 1996-11-11 1997-11-05 遠隔通信ネットワーク

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP96308139.3 1996-11-11
EP96308138.5 1996-11-11
EP96308139 1996-11-11
EP96308138 1996-11-11

Publications (1)

Publication Number Publication Date
WO1998021903A1 true WO1998021903A1 (fr) 1998-05-22

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PCT/GB1997/003041 WO1998021903A1 (fr) 1996-11-11 1997-11-05 Reseaux de telecommunications
PCT/GB1997/003042 WO1998021904A1 (fr) 1996-11-11 1997-11-05 Reseaux de telecommunications

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Application Number Title Priority Date Filing Date
PCT/GB1997/003042 WO1998021904A1 (fr) 1996-11-11 1997-11-05 Reseaux de telecommunications

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JP (2) JP2001504294A (fr)
AU (2) AU4875797A (fr)
WO (2) WO1998021903A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000051361A1 (fr) * 1999-02-25 2000-08-31 Siemens Schweiz Ag Systeme et procede de telecommunications lies aux services de telecommunications avec traduction de numero
WO2001010141A1 (fr) * 1999-08-03 2001-02-08 Nokia Corporation Procede et systeme de mise en oeuvre de services intermediaires dans un systeme de telecommunication
WO2001013654A1 (fr) * 1999-08-18 2001-02-22 Nokia Corporation Procede et systeme de signalisation dans un systeme de telecommunication
WO2001041460A1 (fr) * 1999-12-01 2001-06-07 Nokia Corporation Methode de signalisation et element de reseau pour reseau prive virtuel
WO2001041465A1 (fr) * 1999-12-01 2001-06-07 Nokia Corporation Fonction de portail de reseau pour reseau prive virtuel

Families Citing this family (4)

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FI981768A (fi) * 1998-08-17 2000-02-18 Nokia Networks Oy Menetelmä ja järjestelmä signaloinnin järjestämiseksi
JP3408457B2 (ja) 1999-07-01 2003-05-19 日本電気株式会社 仮想専用線接続システム
DE10120043A1 (de) * 2001-04-24 2002-11-07 Tenovis Gmbh & Co Kg Verfahren zur Übertragung einer Kurznachricht und Telekommunikationssystem
DE10121335A1 (de) * 2001-05-02 2002-11-14 Tenovis Gmbh & Co Kg Verfahren zur Realisierung einer Systemzeit und Telekommunikationssystem

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WO1993015583A1 (fr) * 1992-01-24 1993-08-05 Gpt Limited Recouvrement de reseau de conversation/reseau de signalisation
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GB2297882A (en) * 1995-02-10 1996-08-14 Northern Telecom Ltd Telecommunications system
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EP0627862A2 (fr) * 1993-06-02 1994-12-07 Gpt Limited Réseaux privés virtuels
EP0642282A1 (fr) * 1993-07-28 1995-03-08 ATEA, naamloze Vennootschap Dispositif pour communication entre des réseaux téléphoniques privés et émulateur utilisé pour cela
WO1996004754A1 (fr) * 1994-07-29 1996-02-15 British Telecommunications Public Limited Company Appareil et procede de communication
GB2297882A (en) * 1995-02-10 1996-08-14 Northern Telecom Ltd Telecommunications system
EP0769882A1 (fr) * 1995-10-20 1997-04-23 Koninklijke KPN N.V. Système de transfert de signaux entre centraux téléphoniques privés

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000051361A1 (fr) * 1999-02-25 2000-08-31 Siemens Schweiz Ag Systeme et procede de telecommunications lies aux services de telecommunications avec traduction de numero
US6671361B2 (en) 1999-02-25 2003-12-30 Siemens Schwiez Ag Telecommunications system and method relating to telecommunications services with number translation
WO2001010141A1 (fr) * 1999-08-03 2001-02-08 Nokia Corporation Procede et systeme de mise en oeuvre de services intermediaires dans un systeme de telecommunication
WO2001013654A1 (fr) * 1999-08-18 2001-02-22 Nokia Corporation Procede et systeme de signalisation dans un systeme de telecommunication
US6668052B2 (en) 1999-08-18 2003-12-23 Nokia Corporation Method and system for signaling in a telecommunication system
WO2001041460A1 (fr) * 1999-12-01 2001-06-07 Nokia Corporation Methode de signalisation et element de reseau pour reseau prive virtuel
WO2001041465A1 (fr) * 1999-12-01 2001-06-07 Nokia Corporation Fonction de portail de reseau pour reseau prive virtuel
US6751308B1 (en) 1999-12-01 2004-06-15 Nokia Corporation Signaling method and network element for a virtual private network
US7173940B2 (en) 1999-12-01 2007-02-06 Nokia Corporation Providing gateway functionality in a virtual private network

Also Published As

Publication number Publication date
AU4875797A (en) 1998-06-03
AU4875697A (en) 1998-06-03
JP2001504294A (ja) 2001-03-27
JP2001504293A (ja) 2001-03-27
WO1998021904A1 (fr) 1998-05-22

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