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WO1996015613A1 - Systeme telephonique special destine a ameliorer les services centrex - Google Patents

Systeme telephonique special destine a ameliorer les services centrex Download PDF

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Publication number
WO1996015613A1
WO1996015613A1 PCT/AU1995/000746 AU9500746W WO9615613A1 WO 1996015613 A1 WO1996015613 A1 WO 1996015613A1 AU 9500746 W AU9500746 W AU 9500746W WO 9615613 A1 WO9615613 A1 WO 9615613A1
Authority
WO
WIPO (PCT)
Prior art keywords
station
centrex
pcets
stations
local bus
Prior art date
Application number
PCT/AU1995/000746
Other languages
English (en)
Inventor
Ray Smith
Original Assignee
Telstra Corporation Limited
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 Telstra Corporation Limited filed Critical Telstra Corporation Limited
Priority to AU38354/95A priority Critical patent/AU3835495A/en
Publication of WO1996015613A1 publication Critical patent/WO1996015613A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H04Q3/002—Details

Definitions

  • the present invention is directed at providing a new type of telephone system.
  • the new system is to be called a Purpose-built CENTREX Enhancing Telephone System (PCETS).
  • PCETS Purpose-built CENTREX Enhancing Telephone System
  • CENTREX services have been offered by some telecommunication service providers as an alternative to key systems or PABX's. The CENTREX service is nonetheless considered to suffer from a number of problems and has not always found great acceptance to telephone users as a result. Some of the CENTREX user problems include: a) Lack of Information About Other Extensions
  • CENTREX feature/facility access codes are considered complicated and not intuitive because they comprise relatively long digit strings (e.g. 5 digits). c) Too Many Codes to Remember
  • Smart telephones have keys which have been pre-programmed with feature access codes for use with certain CENTREX services.
  • the programming of the keys is fixed, cannot be "overwritten” and requires the user to purchase another piece of hardware if they wish a change.
  • the smart telephones do not provide information as to the status of other extensions.
  • Figure 1 illustrates a telephone exchange with CENTREX services and with standard or smart telephones.
  • consoles C) CENTREX Attendant (Operator) Consoles
  • CENTREX lines e.g. 4 or 5
  • the monitoring lines only passively sense the status of the user extensions.
  • consoles are specifically designed to emulate, and provide the functionality of, the Operators Console on a PABX. They are not designed to be the general telephone instrument used by every member of an organisation. They are relatively expensive when compared to "standard" telephones and key system terminals.
  • Key systems are designed to provide the user with a wide range of features to improve communications inside, and outside, the organisation.
  • duplication of features can easily lead to customer confusion. They need to remember two sets of access codes and/or operational procedures - one for the CENTREX service, the other for the key system.
  • the present invention is a Purpose-built CENTREX Enhancing Telephone System (PCETS) designed to address the real and user perceived deficiencies in the day to day use, and operation, of CENTREX services.
  • PCETS Purpose-built CENTREX Enhancing Telephone System
  • the present invention seeks to address the problems of the prior art by providing a new telephone product which is adapted to provide user flexibility and core "keysystem" user interface and functionality without the prior art style of equipment which duplicates CENTREX services.
  • the present invention in one form, is predicated on the provision of a
  • PCETS which comprises a relatively localized intelligence and control in each PCETS station together with a local bus interconnecting each PCETS station.
  • the present invention is predicated, in another form, on the provision of a PCETS which comprises in addition to the combination of localized intelligence and local bus connecting each PCETS, a direct connection between each PCETS and the exchange supporting the CENTREX service.
  • PCETS serve to enable the PCETS to use CENTREX services for performance of PCETS many functions and facilities.
  • the PCETS is thus purpose built to provide user flexibility, "core key system” user interface and functionality and without duplication of CENTREX facilities.
  • the localized intelligence provides user definable operation and control of the operation of the PCETS station and localised generation of CENTREX access codes.
  • the local bus enables exchange of information between PCETS stations.
  • the direct connection between PCETS station and CENTREX service enables operation of each PCETS station in a manner that is independent of other PCETS stations, if required. In combination, these features work in order to provide the complimenting of the CENTREX services (supported by the Exchange) with purpose-built features in the PCETS.
  • the synergy of the features of local bus and local intelligence serves to provide pre-programmed function keys that enable user keys to be user programmable and/or have their function determined by system status and/or operation history. These may be called "Smart" keys.
  • the synergy of local bus and local intelligence also allows each of the PCETS stations to determine and/or display the status of the other PCETS stations in the system.
  • the synergy of local bus and local intelligence further enables PCETS stations to support DSS keys.
  • the feature of direct access together with the features of local bus and local intelligence in synergy obviate the need for duplication of CENTREX services, provided by hardware/software e.g. Central Equipment.
  • the features of direct access and local intelligence in synergy provide predetermined or defined functionality of PCETS in certain system conditions e.g. power fail.
  • the present invention in one form, requires at least one CENTREX line per station and relies on the CENTREX services to provide communications control.
  • the additional intelligence of the present invention provides supervisory functions and information exchange between PCETS stations to control the codes transmitted by the "Smart Keys".
  • TERMINOLOGY Access Codes Signals sent to telephone exchange (or similar equipment) to Activate/Deactivate CENTREX Features.
  • Hot Key A type of key that will automatically establish a call to the telephone exchange.
  • DSS Key Direct Station Selection key. A type of key that allows the user to make a call to another Station within the system by pressing just that one key. All Stations in a system have the same number of DSS Keys.
  • DSS Appearance Each Station within a system is assigned a DSS
  • FIGS. 1 , 2 and 3 illustrate non-PCETS systems
  • Figure 4 illustrates one embodiment of PCETS, in schematic form
  • Figure 5 illustrates a comparison of one embodiment of PCETS with some prior art CENTREX systems
  • FIGS 6 and 7 illustrate alternative PCETS embodiments
  • FIG. 8 shows a brief overview of PCETS Installation/Configuration
  • Figures 9, 10 and 11 outline PCETS local bus operation;
  • Figure 12 shows a legend to be used in conjunction with CCITT recommendation Z.100;
  • Figure 13 outlines "startup" and operation from the “line power” state
  • FIGS 14 and 15 outline operation from the "idle" state
  • Figure 16 outlines operation when PCETS receives a ringing signal from an exchange
  • Figures 17 and 18 outline operation of PCETS in actioning a call.
  • Figure 19 outlines other events which may occur in the use of PCETS. 1_ OVERALL SYSTEM LAYOUT/OPERATION
  • the PCETS system utilises at least 2 features and preferably 3 main features (Local Bus, Localised Intelligence and Direct Exchange Connection) to provide the following features/capabilities.
  • a PCETS system can provide Key System like functionality.
  • Each Station which could be a terminal station or a PCETS station, can independently Activate/Deactivate CENTREX type features by sending the appropriate Access Codes to the telepho e exchange.
  • PCETS Stations present the user with keys labelled with PCETS reatures. The Station decides which CENTREX feature to use whenever one of these keys is pressed. Examples of CENTREX features: forwarding calls, holding calls, switching between 2 calls, conference calls for 3 parties, auto call back (refer to the PCETS Station Operation Overview SDLs, Figures 14 to 18). 1.1.1. Simplified access to CENTREX Features
  • the state machine architecture allows the station to determine what
  • CENTREX feature to activate/deactivate when a user invokes a PCETS feature by pressing one key. It also allows a station to provide DSS keys, which can change their behaviour depending on the status of the other stations (see examples 3 and 4 below).
  • the state machine architecture allows for a key to be re-used for accessing similar CENTREX features depending on the current status of the system or recent history of the station.
  • Access Code in its Access Code memory
  • CENTREX type feature Activate/Deactivate
  • These Access Codes are stored in the Station's Non-volatile memory (ie: EEPROM).
  • the memory is in addition to any Speed Dial memory provisions in the PCETS station.
  • a Station can choose the type of CENTREX feature to be Activated/Deactivated based on the history of the activating Station or the status of another Station within the system. The Station does this by accessing its Non ⁇ volatile memory for the Access Code for the feature appropriate to the history of the activating Station and/or the status of another Station. The history and status are stored implicitly because of the use of a State Machine Architecture. (Refer to paragraph 1.2.4, Use of Information Exchanged below).
  • Example 1 A user makes an outgoing call and receives a Busy Tone.
  • the user can then press the Call Back key to request the Auto Call Back CENTREX feature.
  • the Station has remembered that a call is in progress, and sends the Access
  • Example 2 A user, while not in a call, presses the Call Back key to deactivate a previously activated Auto Call Back CENTREX feature. The Station has remembered that no call is in progress, and sends the Access Code for Auto Call Back Cancel to the telephone exchange. (Refer to the PCETS
  • Example 3 Station A is Idle (not involved in a call).
  • a user at Station B presses the DSS key associated with Station A.
  • Station B will send the Access Codes for the Internal Call CENTREX feature, along with Station A's Extension Number, to the telephone exchange. (Refer to the PCETS Station
  • Example 4 Station A is receiving Ring Signal from the telephone exchange.
  • a user at Station B presses the DSS key associated with Station A.
  • Station B will send the Access Codes for the Individual Call Pick Up feature, along with Station A's extension number, to the telephone exchange. (Refer to the PCETS Station Operation Overview SDLs, Figure 14).
  • the PCETS System and or Stations may work with a number of different telephone exchanges (or similar equipment) and that may use different Access Codes to Activate/Deactivate the CENTREX Features supported by PCETS.
  • the Access Codes in Non-volatile memory are loaded from the Station's
  • Each Station stores the Access Codes for a number of different telephone exchanges that implement CENTREX type features, and one of these is selected when a Station is configured. Any of the Access Codes in a Station can also be changed by the user and stored in its Non-volatile memory.
  • Access codes are changed by the user following a predetermined sequence of key presses. For example, the user can press the PROG key, then the # key, then the key who's code is to be changed, then press keys to enter the new Access code, then press the SPKR key to signal the end of the code.
  • ___ Interstation Communications For example, the user can press the PROG key, then the # key, then the key who's code is to be changed, then press keys to enter the new Access code, then press the SPKR key to signal the end of the code.
  • each Station is able to communicate with every other Station in the System.
  • the information exchanged is made up of, but not limited to, Station Status, DSS Appearance & Extension Number, Calling Line Identification information. This information is communicated so that all Stations can display the status of all other Station's, the behaviour of the Station in responding to key presses can be modified, and so that the initial configuration and ongoing system administration is simplified.
  • the Local Bus description provides more detail on how this information is exchanged (refer to section 2, The Local Bus).
  • Page Request (A Station is requesting Paging to be started)
  • Page End (A Station is indicating that Paging is completed)
  • the receiving Stations display this status on the BLF(Busy Lamp Field) associated with the sending Station's DSS Appearance.
  • Each Station transmits its DSS appearance and Extension number to every other Station in the System using the Local Bus.
  • the Local Bus may be hardwired or "virtual", such as shown in Figure 7. This is done to simplify initial configuration and ongoing system administration.
  • a Station When a Station is powered-up or configured, it sends out a request for all Stations in the system to transmit their DSS appearance & Extension number. All Stations receive this request and transmit their data in an order preferably based upon their DSS appearance. All Station's record this information in their Non-volatile memory for use in Activating/Deactivating certain CENTREX features. (Refer to Section 1.1 , Intelligent use of CENTREX Features). 1.2.3. Other Information Exchange Other useful information, such as Calling Line Identification (CLI), can be transmitted by a Station to all other Stations in a System in a manner similar to DSS Appearance & Extension number transmission using the Local Bus. 1 -2.4. Use of Information Exchanged Each station remembers the status and configuration information of other stations within the system. This can become an input to the State Machine to modify the behaviour of the station. (Refer to 1.1.1 Simplified access to CENTREX Features).
  • CLI Calling Line Identification
  • Each Station displays the status of itself and other stations in its Busy Lamp Field(BLF). LEDs can be used to make up the BLF and these can be directly associated with each stations DSS key. The status of the stations can be displayed on the BLF LEDs by either turning it OFF, ON or flashing it a varying rates.
  • the power for the stations is supplied from a Power Supply
  • the PCU supplies power to all the Stations within a System and generates the SYNC timing signal used by the Local Bus (refer to Section 2,
  • the Local Bus Preferably, the PCU only uses one pair of wires for the distribution of power and Local Bus functions, but other configurations are possible, such as separate wires for power and Local Bus.
  • the PCU puts DC power onto the Local Bus. Each Station draws its power from this DC supply via a dedicated circuit. SYNC signals may be generated and placed onto the Local Bus and/or the PCU by modulating the DC current.
  • each Station can act as a simple telephone using its direct connection to the telephone exchange to make and receive calls.
  • the PCETS stations are effectively configured in power fail mode to operate using only the direct connection to the CENTREX exchange. In this way, all PCETS stations can still access the CENTREX features by virtue of the direct connection to the CENTREX exchange.
  • the Local Intelligence reacts to the loss of Local Power by changing the behaviour of the station to reduce power consumption.
  • the State Machine architecture allows easy implementation of this feature. (Refer to PCETS Station Operation Overview SDL, Figures 13 and 19).
  • Direct connection to the telephone exchange allows the power supply to be smart.
  • the station may start drawing power from the telephone exchange and stop supplying power to parts of the station that would draw too much power from the exchange. It may also signal the Local power
  • the Local Intelligence provides basic phone operation. For example, LEDs, audible tones, Interstation communications and HandsFree operation may not be provided.
  • the selection of features not provided in power fail can be predetermined or user definable and, for example, if lower power consumption parts are used, more features could be supported, but at a higher station cost.
  • the line power idle state can be removed and the test for power mode as shown in Figure 13 can be distributed to predetermined events in other states.
  • ___ Basic Phone Operation Each Station has a direct connection to a telephone exchange (or similar equipment, eg: PABX) that provides CENTREX type features. 1.5.1.
  • Each Station can always make outgoing calls as it has its own direct connection to the telephone exchange. This means that it cannot be blocked from making a call due to congestion within the system (too many stations trying to make calls at the same time).
  • a Station can also make outgoing calls if the Local Power Supply fails (Refer to section 1.4, Power Supply).
  • the user can make an outgoing call by performing any of the following: Lifting the HandSet
  • Hot key while not on a call eg: Speed Dial key, some CENTREX Feature key
  • Pressing a DSS key eg: Speed Dial key, some CENTREX Feature key
  • the telephone exchange will signal the Receiving Station when there are any incoming calls. If the Receiving Station is not on a call, then the Receiving Station, and optionally all other Stations, produce a visual & audible indication, (refer to the PCETS Station Operation Overview SDLs, Figures 13 and 14). If the Station is not already on a call, the telephone exchange sends a
  • the Station then starts a Line Ring Tone audible indication and start flashing the visual indicator associated with its DSS Appearance.
  • a user at the Receiving Station can answer the incoming call by: Lifting the HandSet
  • the Receiving Station informs all other Stations in the system (refer to section 1.2, Interstation Communications) that it is receiving Ring Signal. These other Stations will start flashing the visual indicator associated with the Receiving Station's DSS Appearance. If configured to, these Station's will also start to produce a Remote Ring Tone audible indication. A user at one of these other Stations may answer the call by pressing the DSS Key associated with the Receiving Station.
  • the Station If the Station is on a call, the user may answer the incoming call by activating the CENTREX Call Wait feature by pressing a single key. The Station then sends the appropriate Access Codes to the telephone exchange.
  • HandsFree Operation The station allows the user to operate in a HandsFree manner. It does this by providing a loud speaker and a microphone to replace the HandSet. 1.5,3,1 , Volume Ad j ustment HandsFree speaker volume can be adjusted by the user during a call. 1.5.4. HeadSet Operation The station allows the HandSet to be replaced by a HeadSet, and for the
  • the station provides a number of memories that the user can load with telephone numbers or CENTREX access codes. 1 .5.7- Last Number Radial
  • An Optional Display can be used to inform the user of actions performed in response to key presses. It can also be used to display messages/information while configuring the station to the configuration process.
  • the Local Bus is provided so that stations can exchange information (see
  • Section 1.2 Interstation Communications. This facility allows the stations to exchange status information and configuration information. This information may then be used to display the status of all the stations within a system, and to intelligently use the CENTREX features of the connected exchange to provide Key System functionality.
  • the Stations communicate with each other via a common Local Bus. All Stations in the system are connected to this Bus and all Stations preferably receive everything that is transmitted onto the Bus. (refer to Section 1.2, Interstation Communications).
  • the PCU generates a Synchronising signal (SYNC) at a regular interval.
  • This SYNC signals indicates the start of a Frame.
  • a Frame consists of a number of equal sized Time Slots.
  • the Local Bus has 2 operating modes, namely Status Update mode and Exclusive Usage mode.
  • Status Update mode (refer to Local Bus Operation SDLs, Figure 9) is the default mode of operation for the Local Bus. In this mode, all Stations wait for the SYNC signal (which indicates the start of a Frame), and then when it is their turn (their Time Slot) they Broadcast their status. They preferably calculate which is their Time Slot from their assigned DSS appearance. Time Slots are may be determined by either timing or by receiving another station's status.
  • Exclusive Usage mode (refer to Local Bus Operation SDLs, Figures 10 and 11 ) is used for transferring larger amounts of signalling information than can be sent in one Time Slot.
  • An example of its use is in the transfer between
  • Any type of signals could be used on the Local Bus.
  • the type would be determined by a PCETS implementation.
  • a SYNC signal is a DTMF digit D and is transmitted approx. every 650 msec.
  • the Status signals are other DTMF digits, with each Digit representing a different status (eg: DTMF 1 for Busy, DTMF 2 for Idle, DTMF 3 for Ringing).
  • the Configuration Information is represented using a series of DTMF digits, with the first specifying the sender, the next describing the type of information and the rest the actual information. __ LOCALISED INTELLIGENCE
  • the localised intelligence of the Stations enables the system to work without the need of any central or common equipment. It allows each station to decide what is the appropriate action to take in response to user inputs, exchange signals, other stations status and it own history of events.
  • the PCETS system can work in this way by using the appropriate PABX Access Codes to access the required CENTREX type features needed by the PCETS system. (Refer to Figure 6).
  • the stations could have Localised intelligence, which would minimise any changes required to the CENTREX exchange, or the stations could be dumb (minimal intelligence) and the CENTREX exchange could be modified to provide the required intelligence to implement a PCETS system. (Refer to Figure 7).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

La présente invention se rapporte à un système téléphonique spécial améliorant les services Centrex (PCETS), conçu pour remédier aux inconvénients réels et perçus par l'utilisateur impliqués dans l'utilisation quotidienne et le fonctionnement de services Centrex. La présente invention tente de résoudre les problèmes de la technique antérieure grâce à un nouveau produit de téléphonie conçu pour accroître la souplesse d'utilisation, pour constituer une interface utilisateur à système d'intercommunication central et pour accroître les fonctionnalités du système sans avoir recours aux appareillages de la technique antérieure permettant de dupliquer les services Centrex. Ces caractéristiques permettent au PCETS d'utiliser les services Centrex pour mettre en oeuvre les nombreuses fonctions et services du PCETS. Ce système est ainsi spécialement conçu pour accroître la souplesse d'utilisation ainsi que la fonctionnalité, et pour constituer une interface utilisateur à système d'intercommunication central sans dupliquer les installations de Centrex.
PCT/AU1995/000746 1994-11-11 1995-11-10 Systeme telephonique special destine a ameliorer les services centrex WO1996015613A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU38354/95A AU3835495A (en) 1994-11-11 1995-11-10 Purpose-built centrex enhancing telephone system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPM9405A AUPM940594A0 (en) 1994-11-11 1994-11-11 Purpose-built centrex enhancing telephone system
AUPM9405 1994-11-11

Publications (1)

Publication Number Publication Date
WO1996015613A1 true WO1996015613A1 (fr) 1996-05-23

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PCT/AU1995/000746 WO1996015613A1 (fr) 1994-11-11 1995-11-10 Systeme telephonique special destine a ameliorer les services centrex

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WO (1) WO1996015613A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4701950A (en) * 1984-04-12 1987-10-20 Amtel Communications, Inc. Telephone answering system with line detector
WO1991016796A1 (fr) * 1990-04-12 1991-10-31 Northern Telecom Limited Systeme de telephone prive dote d'une fonction de commande simplifiee
WO1992015166A1 (fr) * 1991-02-21 1992-09-03 Vmx, Inc. Systeme integre de messagerie et de traitement d'appel gere par applications
GB2260063A (en) * 1991-09-30 1993-03-31 Mitel Corp System for interfacing telephone sets with a centrex system
US5200996A (en) * 1991-03-15 1993-04-06 Nynex Corporation Station controller for multi-line pick-up and automatic monitoring of telephone station moves
WO1993017515A1 (fr) * 1992-02-28 1993-09-02 Bell Atlantic Network Services, Inc. Centrex sectoriel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4701950A (en) * 1984-04-12 1987-10-20 Amtel Communications, Inc. Telephone answering system with line detector
WO1991016796A1 (fr) * 1990-04-12 1991-10-31 Northern Telecom Limited Systeme de telephone prive dote d'une fonction de commande simplifiee
WO1992015166A1 (fr) * 1991-02-21 1992-09-03 Vmx, Inc. Systeme integre de messagerie et de traitement d'appel gere par applications
US5200996A (en) * 1991-03-15 1993-04-06 Nynex Corporation Station controller for multi-line pick-up and automatic monitoring of telephone station moves
GB2260063A (en) * 1991-09-30 1993-03-31 Mitel Corp System for interfacing telephone sets with a centrex system
WO1993017515A1 (fr) * 1992-02-28 1993-09-02 Bell Atlantic Network Services, Inc. Centrex sectoriel

Also Published As

Publication number Publication date
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