Abstract: A telecommunication system includes a private branch exchange (170) that uses an automatic route selection algorithm to select a trunk on which a call is to be routed. A number of trunk groups are queried for an available trunk and once an available trunk is located, the call is placed. The automatic route selection algorithm monitors the call to determine if an error message or error tone is received. If an error message or error tone is received, a set of remaining trunk groups not previously queried are queried for an available trunk to route the call.

Abstract: A PC-based PBX incorporating preexisting call control software designed to operate in a computing environment which is not PC-based. The PC-based PBX comprises a PC chassis; a PC motherboard within the chassis; a main PBX control card within the chassis for executing the preexisting call control software; a telecommunications card within the chassis and connected to the PBX main control card for implementing telephony communications with a public switched telephone network under control of the call control software; and a DSP card within the chassis and connected to the PBX main control card for implementing signaling and conferencing functions under control of the call control software.

Abstract: A telecommunication system includes a private branch exchange (170) that uses an automatic route selection algorithm to select a trunk on which a call is to be routed. A number of trunk groups are queried for an available trunk and once an available trunk is located, the call is placed. The automatic route selection algorithm monitors the call to determine if an error message or error tone is received. If an error message or error tone is received, a set of remaining trunk groups not previously queried are queried for an available trunk to route the call.

Abstract: A system and method of telephony security for controlling and logging access between an enterprise's end-user stations and their respective circuits into the public switched telephone network (PSTN). A security policy, i.e., a set of security rules, are defined for each of the extensions, the rules specifying actions to be taken based upon at least one attribute of the call on the extension. Calls are detected and sensed on the extensions to determine attributes associated with each call. Actions are then performed on selected calls based upon their attributes in accordance with the security rules defined for those extensions.

Abstract: A method for managing messages in a private branch exchange system uses a personal computer as an operator console. The method includes storing a message to be transmitted to a subscriber who is absent through the personal computer; if there is a call from the subscriber, transmitting a call message from the subscriber indicating whether the call is for confirming the message or is a general call to the personal computer; if the call message is for confirming the message, automatically displaying the message to be transmitted to the subscriber on a monitor of the personal computer; and informing the subscriber of the displayed message.

Abstract: In a PABX switching system: (a) apparatus for receiving dialed digits relating to a call, (b) apparatus for storing a table of groups of predetermined numbers of initial digits and for each group of initial digits storing a subtable, each subtable being comprised of a list of quantities of digits expected to follow a corresponding group of initial digits, each quantity being correlated with a central office or an alternate communication route, each list of quantities of digits being sorted in ascending order, (c) apparatus for selecting a group of initial digits in the table corresponding to first digits of the received dialed digits, and for pointing to a central office or alternate communication route corresponding to a lowest quantity of digits in a subtable of the selected group of initial digits, (d) apparatus for using the central office or alternate communication route for completion of the call in the event the dialed digits contain a quantity of digits corresponding to the lowest quantity of digits,

Abstract: According to this invention, a digital key telephone system connected to an analog public network NW having a function of transmitting a ringing signal including identification information of a calling line through a subscriber line (CO line), accommodating a plurality of extension lines each connected to a digital key telephone (DKT) 2 or a standard telephone (STT) 4 as an extension terminal, and having a function of switching and connecting the subscriber line to the plurality of extension lines or the extension lines to each other includes a called party storage means storing, in advance, information representing the correlation between the calling line and the extension terminals 2 and 4 as a called terminal. When a ringing signal arrives from the analog communication network NW, calling line identification information (caller ID) contained in the ringing signal is detected by a calling line identification information interface unit (RCIU) 12.

Abstract: According to this invention, a digital key telephone system connected to an analog public network NW having a function of transmitting a ringing signal including identification information of a calling line through a subscriber line (CO line), accommodating a plurality of extension lines each connected to a digital key telephone (DKT) 2 or a standard telephone (STT) 4 as an extension terminal, and having a function of switching and connecting the subscriber line to the plurality of extension lines or the extension lines to each other includes a called party storage means storing, in advance, information representing the correlation between the calling line and the extension terminals 2 and 4 as a called terminal. When a ringing signal arrives from the analog communication network NW, calling line identification information (caller ID) contained in the ringing signal is detected by a calling line identification information interface unit (RCIU) 12.

Abstract: In a communication system (KS), communication terminals (KA) provided for a legitimacy check are allocated to at least one inhibit dial evaluation routine (SWABE). In the framework of a call (ar), the call numbers (zrn) communicated to the inhibit dial evaluation routine (SWABE) as well as the call number (rnr) of the respective communication terminal (KA) are acquired and call numbers (zrn) or, respectively, call number combinations (rnr,zrn) that cannot be evaluated are reported to an application means (PC) via an application interface (acl). The calls (ar) are held in the communication system (KS) until the communicated call numbers (zrn) or, respectively, call number combinations (rnr, zrn) have been checked in the application device (PC) in view of their legitimacy and a legitimacy result (acl-amo) has been communicated from the application device (PC) to the communication system (KS).

Abstract: A private branch exchange has optional service modules for providing optional service functions. The optional service modules are initially disabled, but can be enabled through a telecommunication link, in reply to owner information furnished by the private branch exchange. If the owner information is incorrect, the optional service modules can still be enabled, but the owner information stored in the private branch exchange is altered to leave evidence of the enabling operation. The enabling is carried out by remote authorization equipment according to an authorization key that specifies both the required optional service modules and the owner information. The authorization key is stored on a data medium that can be read only once.

Abstract: A group conferencing arrangement for a counseling service permits the simultaneous connection of two or more service representatives to a call-in caller, i.e. without the need for one service representative to add-on the second service representative conferee. The call-in caller signifies their wishing to partake in a plural service representative call by dialing a special 800 or 900 telephone number or signifying the same via entering an appropriate response to an audio response unit. Each service representative may have a terminal equipped with a display or other means for receiving the identity of the call-in caller and the other service representative connected to the group conference call.

Abstract: A method of, and a system for, detecting possible fraudulent use of a telecommunications network. Call event records, both call initiation and call completion records, are examined. A call record has a number of key fields, e.g. called number, calling number, calling card number, and for each field in turn the key is used to access a database containing an associated set of profiles. Each profile contains an algorithm defining a measurement process to be performed on the call data, e.g. determine the call duration. The respective process results are added to a respective set of stores associated with each profile, and an alarm response is generated when a threshold of a store is reached. An additional process for e.g. a call duration of e.g. called number card calling number key fields, convert the process results to penalty points which are added to a penalty points store associated with the calling card number key of the call event record under examination.

Abstract: A system and method for controlling the use of a telephone based on usersupplied access criteria. The system includes a database for storing the access criteria. The access criteria can be modified in response to commands received from the telephone. The system also includes a switch, electrically coupled between the telephone and a telephone network, for selectively coupling the telephone and the telephone network based on the access criteria stored in the database.

Abstract: A communications system and method for automatically making telephone routing decisions with "global authority" based upon information gathered in real time from the entire communications system and global optimization criteria. The present invention permits unified central control and management for the entire system.

Abstract: A telephone central office switch (103) provides Centrex features, including intercom dialing, on central-office-to-PBX (133, 134) trunks (123, 124) by using the 4-wire subscriber feature of the Lucent Technologies 5ESS.RTM. switch to administer trunk ports (113-114) that serve the central-office-to-PBX trunks as 4-wire telephone lines and then further administering those trunk ports for Centrex features. Those trunk ports, and optionally also some line ports (115-116), may be administratively assigned the private network numbering plan of respective PBXs so as to enable intercom dialing among those trunk ports, and between those trunk ports and the optional line ports.

Abstract: A protocol for multilink access network-local exchange (AN-LE) interfaces is provided for common channel signaling on all AN-LE links and the transfer of calls and control to operational links upon detection of a link failure. The protocol permits the AN to assign channels on an AN-LE link and is error-tolerant and self-aligning.

Abstract: A telephone communication system having a locator system for locating telephone users and generating location information. The telephone communication system includes a plurality of telephone functions which are user accessible for usage in conjunction with the location information. Each telephone of the system may be configured to facilitate interactive control and selection of the system features by the users.

Abstract: The disclosed invention provides system and method for real-time screening and routing of incoming telephone calls. The invention provides a method of automatically routing incoming telephone calls to either internal phone call processing resources or to destination parties (system users) as defined by the individual destination parties. Dynamic extensions are assigned by a system user on demand from a pool of unassigned extensions, which are generated by an autoattendant telephone call routing system. As a dynamic extension is assigned to a particular caller, identification attributes are input into the system, which may include calling party identification information supplied by the source carrier of the calling party. The system then tags the assigned extension with the identifying information. Such tags are subsequently used by the system to classify the caller when the caller accesses internal call processing resources.

Abstract: A system D interfaces with a multiplicity of individual terminals T1-Tn of a telephone network facility C, at the terminals callers are prompted by voice-generated instructions to provide digital data that is identified for positive association with a caller and is stored for processing. The caller's identification data is confirmed using various techniques and callers may be ranked and accounted for on the basis of entitlement, sequence or demographics. Callers are assigned random designations that are stored along with statistical and identification data. A break-off control circuit may terminate the computer interface aborting to a terminal for direct communication with an operator. Real-time operation processing is an alternative to stored data. The accumulation of stored data (statistical, calling order sequence, etc.) is variously processed and correlated as with developed or established data to isolate a select group or subset of callers who can be readily identified and reliably confirmed.

Abstract: A stand-alone toll-barring device powered by the telephone line voltage or from an external supply. The device recognizes a user's personal identification number (PIN) as it is dialed in from a telephone or similar peripheral device, and has device to recall rights (if any) corresponding to that PIN from a memory table, and a device to assess whether a number being dial just after entry of the PIN is permitted under those rights. Emergency numbers and incoming calls are not barred. If the number is not permitted, the call is immediately interrupted. Reprogramming of the data is provided by a further PIN. The device may be installed within a telephone or across fixed telecommunications wiring installations within a building. Should a larger range of permitted or denied numbers be required, multiple devices can be used in series.

Abstract: A fraud detection system is disclosed for telephone PBX calls. The system includes a fraud data server for buffering the call detail records relating to inbound 800 number calls and outbound international calls. A threshold manager is connected at its input to an output of the fraud data server for detecting numerical counts exceeding preselected threshold values, in predetermined fields of the call detail records, and generates an alarm. The output of the threshold manager is connected to an input of the fraud data server for buffering the alarm incident to respective call detail records. A computer workstation is connected to the fraud data server for receiving packets of call detail records relating to alarm data, in a filtered preselected format. The workstation includes a monitor for displaying the alarm data on a graphical interface.

Abstract: A method and apparatus for providing an alarm call using a DISA line in a private exchange includes: storing a password for limiting the use of the DISA line; externally connecting the DISA line to thereby receive an alarm call request; receiving an alarm call request and password from a user when the user is connected to the DISA line; storing time and telephone number to which the alarm call is to be sent, if the password input by the user is identical to the stored password; periodically comparing the stored time with a current time; and dialing the stored telephone number to provide an alarm call when the current time is identical to the stored time.

Abstract: A group conferencing arrangement for a counseling service permits the simultaneous connection of two or more service representatives to a call-in caller, i.e. without the need for one service representative to add-on the second service representative conferee. The call-in caller signifies their wishing to partake in a plural service representative call by dialing a special 800 or 900 telephone number or signifying the same via entering an appropriate response to an audio response unit. Each service representative may have a terminal equipped with a display or other means for receiving the identity of the call-in caller and the other service representative connected to the group conference call.

Abstract: The method of in-session activation of the present invention gives Telcos the ability to offer callers a menu of call completion services when the call encounters a busy or no-answer condition. It provides in-session activation capability from DTMF and dial-pulse sets enabling callers to activate the services without having to hang up. The method is intended for residential and business end-users with RES, business lines, or PBX lines.

Abstract: An incoming call service method and apparatus for an exchange, having a character conversion table and a specific function table, includes: receiving and comparing an extension number and a password of a subscriber upon the generation of a specific office line incoming call; if the extension number and the password are identical to previously stored information, analyzing key data received, based upon the character conversion table and the specific function table; if the received key data is character information, converting the key data into character data to transmit the character data to a corresponding extension subscriber; and if the key data is function information, setting a corresponding function of the corresponding extension subscriber.

Abstract: A standard phone jack is provided with a lock cylinder having a rotatable contact arm which is capable of rotating between a first open circuit position when in its locked position and a second closed circuit position where it engages a wire contact to provide access to a dial tone. In such a manner, it completely cuts off all access to the outgoing phone line when locked so that no calls may be made or received by unauthorized users, nor can charge calls or collect calls be accepted by unauthorized users.

Abstract: A system and method for allocating an incoming call to a desired one of a plurality of destination candidates in response to data in at least one predetermined category concerning a caller, e.g. the area, the company or the department of the caller (a source address mode). There may be other modes such as a direct in line (DIL) mode and global mode. When a call is received by one of trunk circuits, the termination mode for the call is set for one associated with the trunk circuit that received the call. In case of the source address mode, the call is allocated to one of the destination candidates which is associated with the caller number or a part thereof. An association between a caller number (a part thereof) and a destination candidate is preferably achieved using a destination information table containing at least such information.

Abstract: A multi-terminal network such as a PABX system or a computer network is installed by compiling data corresponding to the location, identity and configuration of each terminal. An individual record containing the compiled data is generated for each terminal, preferably in the form of a sticker or label, and is located at the site of the relevant terminal. The network is then installed and configured according to the compiled data. To facilitate this, a software-based system is provided which includes a data input module, which typically runs on a PC at the site of the network, and a control module which runs on a computer at the premises of the service provider responsible for the network. Communication between the modules is provided for, to permit remote updating of the control module, and also to facilitate remote servicing of the network.

Abstract: A no-ring access telecommunications system is connected to a subscriber's telephone line at the demarcation point between the public switched telephone network and the telephone line or at the utility meter site on the subscriber's premises, or at a central office. The telecommunications system comprises a processor, and a normally open switch which is selectively closed by the processor to connect the telephone line to another line servicing subscriber telecommunications equipment connected in parallel thereto. The telecommunications system is programmable to suppress the first power ring signal of an incoming call on the telephone line from a remote host system. The ring signal is analyzed for Caller ID, distinctive ringing or other special tone. If a valid Caller ID, distinctive ring signal or other special tone is provided, the switch is closed. The Caller ID is regenerated on the line servicing the subscriber telecommunications equipment.

Abstract: In a private branch exchange apparatus having a plurality of extension ports, each extension port capable of connecting a push button telephone and a general standard type telephone in parallel, when a call occurs at one extension port where the parallel connection has been done, a ring sound can be produced at the push button or standard type telephone selectively. An additional dialling provides the selection between the push button and the standard type telephone. A memory may specify either of the push button or standard type telephone to be ringed. A call between the push button telephone and the standard type telephone can be provided in accordance with the additional dialing or data stored in a memory.

Abstract: A system and method for preventing fraudulent calling activities of computer data systems such as a Private Branch Exchanges (PBX) accessed through dial-up telephone lines via a remote maintenance or administration port. The system is readily adaptable to existing PBX systems without the need to alter PBX hardware or software configurations. The system includes a device to passively monitor calling activity conducted through the remote port of the PBX without alerting the caller in order to detect a condition of activity indicative of fraud. The monitoring device may include rule based expert system software to analyze call transmission data for activities outside the norm that are indicative of fraud. Alternatively, the monitoring device may include software or hardware for comparing call digit origination data to a database of authorized call activity contained within the monitoring device.

Abstract: A telephone system has a plurality of telephone terminals, a plurality of individual identification information input devices associated with the telephone terminals, respectively, for entering individual identification information, telephone terminal data memory devices for storing telephone terminal data corresponding to individual identification information and related to telephone services accessible through the telephone terminals, a first memory table for storing data to retrieve individual identification information from one of the telephone terminals which is used, a table manager for rewriting the data stored in the first memory table in a manner to associate individual identification information with the used telephone terminal each time the individual identification information is entered from the individual identification information input device associated with the used telephone terminal, a data retriever responsive to use of the used telephone terminal for searching the first memory table to re

Abstract: Relates to arrangements for utilizing an originating caller's customer network identifier (ONI) to provide special treatment of a call, especially one that terminates outside the caller's network. The ONI is recognized in an originating switching system and is transmitted in an initial address message (IAM) to the terminating switching system for serving the call. In the terminating switching system, the ONI is used to screen the call for special treatment such as denied termination, denied termination for collect calls, or direct completion to a principal of a principal-secretary group. The ONI is also used for screening for use of originating services for members of a network. The originating or terminating switch can also query a data base to obtain screening data.

Abstract: An electronic private branch exchange system with a message recording function comprises a private branch exchange with at least one office line and a plurality of extensions for selectively switching between the office line and the extensions and between the extensions, extension telephones connected to the extensions, and a recording unit for recording and reproducing speech transmitted and received by the extension telephones, wherein each of the extension telephones includes request input means for inputting desired requests including requests for recording and reproducing speech related to its own call, and request informing means for informing the electronic private branch exchange of the contents of the request inputted from the request input means, and the electronic private branch exchange includes recording management control means for providing control of the recording unit according to the contents of the request, the control including the recording and reproducing of the contents of speech, when

Abstract: In a network of telecommunication switches, a first switch redirects a to-be-covered call to a remote call-covering endpoint served by a second switch, without losing control over the call. The first switch accompanies connection of the call to the second switch with signaling that identifies the call as a coverage call. The second switch responds to the signaling by determining the available status of the remote covering endpoint and signaling the status back to the first switch. If the remote covering endpoint is available, the second switch takes steps to connect the call to the endpoint. If the remote covering endpoint is not available, the first switch disconnects the call from the second switch and proceeds to cover the call to an alternative covering endpoint. The net effect is that call coverage works--from a user viewpoint--identically across a network of switches as it does on a single switch.

Abstract: Access of a user to a resource, such as a telecommunications network, includes storing, in a first call data base, a first set of attributes concerning an ongoing call from a caller. A second call data base stores a second set of attributes concerning the history of prior calls made by the caller. A rules data base stores rules concerning attributes for determining whether to disconnect the call, block future calls, or take other action. A determination is made whether data in at least one of the call data bases matches the rules in the rules data base. The call is then disconnected, the next call blocked, or other action is taken, in response to a match between data the call data bases and data in the rules data base. Preferably, the second call data base is updated in response to matches with the rules data base.

Abstract: An adjunct unit provides Incoming Caller Line Identification (ICLID) capability for a communication system. The adjunct unit interposed between the control unit and station sets of a communication system obtains ICLID from ringing central office lines and monitors signalling between the control unit and station sets to determine which stations are to receive the ICLID information. Using prestored database information the ICLID information can be used to obtain the calling party name for output to the station sets. The adjunct unit also outputs ICLID information to an application processor which stores calling records for the system.

Abstract: A connection system of a public network subscriber and a private network subscriber in ISDN includes a first PBX for connecting the public network subscriber and the public network, a second PBX for the private network subscriber and the private network, and third PBXs for connecting the public line and the private line. The first PBX selects one of the third PBXs as an access point to the private network, and forms a first set-up message having the public line number of the selected access point as a destination, the received private line number as a sub-address, and the public line number of the public network subscriber as a calling party identification. The second PBX selects one of the third PBXs as an access point to the public network, and forms a second set-up message having the private line number of the selected access point as a destination, the received public line number as a sub-address, and the private line number of the private network subscriber as a calling party number.

Abstract: An apparatus and method is provided for limiting the connection time of selected telephone lines in a private branch exchange (PBX) telephone system to telephone numbers dialed therefrom. A maximum connection time is programmed into the system for selected lines. Calls are automatically terminated if the duration of the call exceeds the maximum time. The selected line is prevented from re-dialing the called number for a certain period of time. If desired, the selected telephone line is automatically enabled and disabled by the system at predetermined times. The telephone system may also incorporate other conventional features for certain ones of the telephone lines in the PBX system, including limited prefix dialing capabilities, limited area code dialing capabilities, blocking of incoming calls, and the like.

Abstract: A method of and apparatus for controlling a data transfer by a transfer deliverer node from a terminal equipment belonging to the transfer deliverer node to another node, in a network system having a plurality of nodes connected to a public switched network and a plurality of terminal equipments connectable to a corresponding node.

Abstract: A telephony controller for controlling a private automatic branch exchange (PABX) is disclosed that utilizes a single functionality command protocol to reduce the data traffic on a computer network or the like used to control a PABX. The telephony controller includes a functionality command converter, a communication layer for communicating with computer terminals on the computer network, and a PABX interface for communicating with the PABX. The single functionality command protocol uses a generic command format for a number of function commands that are converted by the functionality command converter into the PABX commands corresponding to the vendor specific PABX. The functionality converter generates the PABX commands to implement a function command and monitors the PABX to determine whether the command has been implemented.

Abstract: A private automatic branch exchange includes a four-wire type extension modular jack for connection to a four-wire type analog key telephone set as an extension terminal device and for connection to both a two-wire type digital key telephone set and a standard two-wire telephone set as extension terminal devices. Event determining circuitry determines whether or not an event has been received and the kind of extension terminal device concerning the event and outputs a control signal accordingly. Analog/digital key telephone set interface circuitry makes a data signal exchange with an analog key telephone set or a digital key telephone set connected to the extension modular jack. Standard telephone set interface circuitry makes an analog signal exchange with an analog key telephone set or a standard telephone set connected to the extension modular jack.

Abstract: An adjunct processor (16) sends an end-of-address indication, such as a pound sign, along with the address, such as an extension number, to which a call is to be transferred, to a switching system (12, 14). The sent end-of-address indication causes the switching system to not accept further addressing information from the caller (10), thus preventing the caller from modifying the sent address and effecting the transfer of the call to an address different from the sent address, such as a long-distance telephone number. Perpetration of adjunct-assisted toll fraud is prevented thereby.

Abstract: In a telecommunications system that includes a plurality of user terminals and terminal translations that define attributes of the individual terminals, shared use of the terminals by a plurality of users, or use by a user of different ones of the terminals at different times, is facilitated. Each terminal's physical translations, which include for each terminal those attributes that are independent of the users of the terminal and which include a physical extension number, are associated with the corresponding terminals. Each terminal's default terminal translations, which include for each terminal those attributes that are dependent on the users of the terminal and which include a call-coverage path, also are associated with the corresponding terminals. Each user's logical translations, which include for each user those attributes that are independent of the terminals used by the user and which include a logical extension number and a call-coverage path, are associated with the corresponding users.

Abstract: An inexpensive software copy protection arrangement prevents the unauthorized use of customized software for a private branch exchange switch. The arrangement employs a process which recognizes the signature of typical unauthorized activities and freezes the administration capability of the private branch exchange switch when such signature is detected. By freezing the administrative capabilities, the addition, removal or change of an administrative port, extension or routing pattern on the private branch exchange switch is prevented.

Abstract: There is disclosed a method for restricting a telephone call in a key telephone or a private branch exchange (PBX). In the method, a user can restrict the telephone call by directly installing a telephone call restricting code when the user intends to restrict a toll call or international call according to the class of extension line. According to the method, a memory table for use in setting a code for allowing or denying a telephone call is designated and the user directly installs a telephone call restriction code on the vacant memory of the designated allowing/denying table and a telephone call is easily restricted according to the installed class designation data. Therefore, the improvement makes it possible to freely restrict an international telephone call as well as a toll call without changing the main program on the system even when the telephone call system of a telephone office switchboard is changed.

Abstract: Method and apparatus are disclosed for initiating multiple call transfers from a Voice Mail System ("VMS") to telephone extensions on a Private Branch Exchange ("PBX") integrated with the VMS. A plurality of first lines between the PBX and the VMS provide voice communication between callers and the VMS via the PBX. The VMS includes an applications processor which is integrated (coupled) to the PBX via an integration link. The applications processor determines if at least one of a plurality of second lines in a hunt group are free, and transmits a command to the PBX to effect a call transfer to an extension on the PBX if at least one second line is found free. If no second line is found free, the applications processor places the transfer request in a queue. The plurality of second lines in the hunt group are searched in response to the PBX receiving the special command over the integration link to find a free second line.

Abstract: A device for responsively providing, in cooperative association with the 911 emergency system, the number and location of a telephone, especially a PBX extension telephone, from which such a 911 emergency call originates. A first device is installed between PBXs and the extensions thereof, with the number and location of each extension stored in the device's electronic memory. A second such device is installed at a Public Safety Answering Point. When 911 is dialed from an extension telephone of a PBX equipped with a device of the present invention, even if the extension receiver is still on-hook, the extension is connected over telephone lines to the second device installed at the PSAP. The device at the PSAP then interrogates the device at the PBX which responsively transmits the location of the extension telephone from which the call originated. The device installed at the PSAP relays the location information to at least one computer which informs an operator of the location of the calling phone.

Abstract: A personal paging equipment is connected to a telephone private branch exchange having a central controller and a central memory, wireless call (ringing) device belonging to the personal paging equipment in addition to the paging transmitters, these call or ringing devices dependent on the selected operating mode of the personal paging equipment, providing the subscribers to be called either with only a ringing signal or, in addition to the ringing signal, the telephone number of the calling subscriber as well, for example, via an integrated display. When the page request derives from an exchange, the telephone number of the calling subscriber is replaced by an identifier information by the controller and is forwarded to the personal paging equipment. After selecting the identifier information at an arbitrary telephone set, the connection is through-connected between the waiting, calling subscriber and the answering subscriber.

Abstract: A private branch exchange for controlling the calls terminated from a direct-in line receives a call set-up message containing termination information including termination address information and termination subaddress information. The termination subaddress information is supplied by the originating station and includes a security code and an internal station number. A dial signal deciding part converts the security code into a class-of-service number in accordance with a security code table containing to class-of-service numbers. The services of the private branch exchange which are offered to a subscriber, for example termination to station or origination of call, are determined by indexing a class-of-service table containing class-of-service information using the class-of-service number.