KR100263379B1 - Call transfer between different groups of electronic exchange - Google Patents

Abstract

PURPOSE: A method for converting calls between groups of a full electronic exchange is provided to convert a received call of an optional CENTREX(CENTRalized Exchange) group to an other CENTREX group within a same super group. CONSTITUTION: A full electronic exchange integrates many groups as one super group. When an outer subscriber requests a call conversion from a specific attendant of the first group to other attendants of the second group, the full electronic exchange calls the corresponding attendants of the second group. If responses are received from the attendants of the second group, the full electronic exchange decides whether the second group and the first group are included to the same super group. If so, the full electronic exchange requests a leaving of the corresponding attendant of the first group, and connects a communication path between the corresponding attendants of the second group.

Description

Method of switching a call of other groups in the digital switching system

The present invention relates to a call transfer method of an electronic exchanger, and more particularly, to a call transfer method between other groups of an electro-electronic exchanger that transfers a call received to a specific group to another group.

In general, electronic switchboards are equipped with packet switching functions and comprehensive information to provide a wider range of voice and non-voice information communication services through matching not only telephones but also video phones, video tex, facsimile, telex, computers, televisions and various private switching networks. ISDN (Integrated Services Digital Network) is being developed to accommodate advanced network functions such as subscriber access functions, value-added service functions, and mobile communication exchange functions.

FIG. 1 is a structural diagram of a general electronic switch, wherein the electronic switch is composed of three sub-systems: an Access Switching Subsystem (ASS), an Interconnection Network Subsystem (INS), and a Central Control Subsystem (CCS).

The ASS includes a subscriber and trunk line interface, a T-switch, an Asynchronous Transfer Mode (ATM) switch, a frame relay handler, an optical subscriber interface, various signaling devices, a packet handler, and the like. It performs call processing function, self operation and maintenance function. The transmission medium with the INS is an optical link, also called a data link. It accommodates ISDN subscriber interface, No.7 signaling device, frame relay handler, packet handler function and PCS (Personal Communication Service), ATM, optical subscriber access device.

In addition, the ASS is ASS-S (Subscriber), ASS-T (Trunk), ASS-S / T (Subscriber / Trunk), ASS-7 (No.7), ASS-P (Packet), ASS -I (ISDN), ASS-ATM, ASS-F (optical subscriber access device), ASS-PCS, ASS-FR (Frame Relay) and the like may be used in combination.

The INS is located at the center of the system and performs a function of connecting ASS to each other or between ASS and CCS. Point-to-point data links between the INS and the ASS provide communication between the INS and each ASS (information exchanged between subscribers or for use within the system). The INS end of the data link is referred to as a space switch data link (SSL), the ASS end is referred to as a time switch link (TSL), and a link exists for a control action between the CCS and the INS. In addition, the switch network is based on the T-S-T switch structure, the space (S) switch is located in the INS, the time switch (T) or ATM switch is accommodated in the ASS.

In addition, the INS performs a centralized function such as a space switch connection among the call processing functions, and has a network synchronizer to generate and distribute a system clock.

The CCS performs the overall operation and maintenance of the system. In addition to system level operation and maintenance, management, and statistical functions, it performs mass storage media (MT, disk) control management, various input / output statement control with the operator, and interworking with other systems.

On the other hand, the switchboard (national exchange) is to group some or all of the subscribers connected to the same switchboard in order to provide the subscribers with various functions that were provided only in the private exchange, and any subscriber in each group Introduced the CENTRALized EXchange (CENTREX) feature, which allows users to call other subscribers in the same group using only the extension dial.

FIG. 2 is a diagram illustrating a connection state between a conventional electronic switch, a reception desk, and a subscriber in which a CENTREX function is introduced, wherein some or all of the subscribers connected to the same electronic switch are integrated into a plurality of CENTREX groups (A and B). Up to 10 guides are registered in the CENTREX group (A, B) to perform the guide function of the group. More specifically, up to 1000 CENTREX groups may be accommodated in one electronic exchanger, and only a part thereof is shown in FIG. 2.

The subscribers registered in the CENTREX group are divided into several levels, so that some subscribers are restricted from calling outside the CENTREX group, and some subscribers can receive special services (multiple calls, etc.) in addition to the services basically provided by the CENTREX group. Among them, the guide is a device that provides a variety of services for low-grade subscribers of which outbound calls are limited.

In addition, the information desk is provided with a terminal equipped with a key panel, a monitor screen, and the like, and the receptionist working at the information desk responds to the inquiries related to the subscriber's telephone number, billing data or other phone calls using the information desk terminal. The company provided various services and managed the CENTREX group.

On the other hand, in the past, if a situation where any guide can not normally service, the call is switched to other guides registered in the same CENTREX group to allow other guides to perform services on behalf of the subscribers of the CENTREX group The service was provided.

However, in the related art, only the call transfer between the guides registered in the same CENTREX group was possible, but the call transfer between the guides registered in the different CENTREX groups was not possible, causing inconvenience to subscribers.

For example, an outgoing call that was received as a guide registered in CENTREX Group A could not be diverted to a guide registered in CENTREX Group B and thus could not be connected to subscribers in CENTREX Group B.

The present invention has been made to solve the above problems, by integrating a plurality of CENTREX groups into one super group, a call that is received by any CENTREX group belonging to the super group to another CENTREX group belonging to the same super group The purpose of the present invention is to provide a call switching method among other groups of the electronic switchboard, which can facilitate the subscriber's convenience and diversify the information service.

In order to achieve the above object, a call switching method between other groups of an electronic switch according to the present invention is divided into several groups of subscribers, and at least one guide is registered in each group. A method comprising: a first step of integrating a plurality of groups into one super group, and from an external subscriber (hereinafter referred to as a calling party) that is received according to a specific guide of a first group belonging to the super group. A second step of calling a corresponding guide of the second group when a call transfer to a guide registered in a group (hereinafter referred to as a second group) is requested; and when receiving a response from the corresponding guide of the second group, A third step of determining whether the second group belongs to the same super group as the first group, and as a result of the determination of the third step, the second group is the first group; If the member is disposed in the same super-group it is characterized in that the fourth step is to connect the call to the first group that the requested instructions to cause the exit of the second group and of the outgoing-side guide daegan provided.

The present invention may further include outputting a call rejection message to a corresponding guide of the first group if the second group does not belong to the same super group as the first group. It is preferable.

1 is a structural diagram of a general electrical exchanger,

2 is a diagram illustrating a connection state between a conventional electronic switch, a guide, and a subscriber in which a CENTREX function is introduced;

3 is a connection state diagram of an electronic switch, a guide and a subscriber for implementing the present invention;

4 is an internal configuration diagram of an ACC of an electronic exchanger for implementing the present invention;

FIG. 5 is a flow diagram illustrating a process in which an electro-exchange exchanges a call forwarded to an arbitrary CENTREX group to another CENTREX group according to an embodiment of the present invention. FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a diagram illustrating a state of connection between an electronic switch, a reception desk, and a subscriber for implementing the present invention, in which a part of subscribers connected to the same electronic switch is integrated into two CENTREX groups (A and B), and two CENTREX groups (A, B) is integrated into one super group, and at least one guide is registered in each CENTREX group (A, B).

Figure 4 is a block diagram showing the internal configuration of the ASS of the electronic switch for implementing the present invention, the ASS is an Access Switching subsystem Processor (ASP) equipped with an Attendant Console Control (ACC) block, and Digital Subscriber Interface Telephony Processor (TP) block and BRI (Basic Rate Interface) hardware module connected with guide.

The DSI block is a software block that receives information from a BRI hardware module to which a guide is connected, transfers received information to an ASP, which is an upper main processor, and controls a device.

In addition, the DSI block separates the 2B + D signal and data information received from the subscriber into the B channel and the D channel, and transmits the B channel to the time switch, and the D channel transmits the link access procedure on the D- It handles channel protocol and transmits error-free signaling information to ISDN Subscriber Access Processor (ISAP) and has ISDN subscriber line termination.

The ACC block is a guide control software block loaded in an ASP which is a main processor of the ASS. The ACC block performs an interprocessor communication (IPC) communication with the DSI block to process a control message transmitted by the guide.

In order to implement an embodiment of the present invention, the inter-guide call transfer control block is generated / deleted in the ACC block. The call transfer control block includes a main module which is in charge of the overall control of the guide call transfer service, a term module which is a processing module for the incoming call to the guide, and an outgoing call from the guide to the internal or external subscriber of the CENTREX group. It consists of an org module, a holdorg module which is a hold control module for guide call origination call, a holdterm module that is a hold control module for guide call incoming call, and a trforg module that is call transfer control module. In addition, the modules are each created / destroyed in the form of a process.

The guide is connected to an electronic switching system using BRI, an ISDN interface, and its basic call procedure follows the procedures of ISDN Q.921, Q931. The BRI provides a channel capacity of 2B + D to each subscriber. The BRI is allocated a B channel by using a D channel (16 Kbps) to transmit a signaling message necessary for connection, maintenance, and release of a call. Deliver the necessary data (voice, digital data, etc.)

In addition, the guide is provided with a terminal provided with a key panel, a monitor screen, etc. The terminal collects and stores the IPC data generated by the electronic switchboard and outputs it to the monitor screen at the request of the guide.

Referring to the flowchart illustrated in FIG. 5, a detailed description of a process of converting a call received by an arbitrary CENTREX group into another CENTREX group according to an embodiment of the present invention will be given below.

First, when a call is received from subscriber A (external subscriber) shown in FIG. 3 to guide A registered in CENTREX group A, the main process generates a term process, and the term process delivers that the call has been received to the terminal of guide A. In turn, the terminal of guide A rings and announces the incoming call to the attendant.

Subsequently, when the receptionist working at the reception desk A hooks off the terminal, a telephone call is made between the receptionist at the reception desk A and the subscriber A, and the subscriber A is at the reception desk of the reception desk A. When the receptionist asks for a call transfer to guide B registered in CENTREX group B, the guide who works at guide A operates the key panel of the terminal, and guide B of CENTREX group B belonging to the same super group. Enter your phone number.

When the telephone number of the guide B is input from the terminal of the guide A, the term process is succeeded to the holdterm process under the control of the main process. When the telephone number of the guide B is completed, the main process creates a new org process. In this case, the org process requests an incoming call to Guide B.

The org process then receives a response from guide B (the guide working at guide B hears the ring ringing on the terminal and hooks off the terminal), and transfers the call between guides from the terminal of guide A. If requested, determine whether guide B is in the same supergroup as guide A.

If the guide B does not belong to the same supergroup as the guide A, the org process transmits IPC data to the terminal of guide A through the DSI block and the BRI hardware module and calls the call on the monitor screen provided in the terminal. Causes the rejection message to be displayed.

On the other hand, if the guide B is in the same supergroup as the guide A, the org process is inherited by the call transfer control module trforg under the control of the main process.

Then, if the trforg process requests call transfer information to the holdterm process, the holdterm process requests out to guide A, the trforg process notifies the call transfer, and the trforg process is notified of the call transfer. Call transfer to process.

The holdterm process requests connection to the call transfer call to subscriber A when connection to the call transfer call is requested, and notifies the transfer of the call transfer call to the trforg process when the subscriber A is informed of the transfer to the call transfer call.

When the trforg process is notified of the transfer of the call transfer call, the guide B notifies the transfer of the call transfer call so that the telephone call between the guide B of the guide B and the subscriber A is made.

When the telephone call is made between the subscriber A and the guide B as described above, the guide A transitions to the standby state for the next service, and the holdterm process and the trforg process are destroyed.

As a result, the receptionist working at the reception desk of CENTREX Group A responds by requesting Member A to CENTREX Group B in response to a request for a call transfer from external Subscriber A to another CENTREX Group within his supergroup, for example CENTREX Group B. Participant A may make a call, and subscriber A may make a telephone call with a receptionist at information desk B and request a telephone call with a specific subscriber in CENTREX group B.

As described above, the present invention can convert a call that is received to any CENTREX group belonging to a super group to another CENTREX group in the same super group, thereby facilitating subscriber convenience and diversifying information service. It has an effect.

Claims (2)

In a call transfer method of an electronic switchboard, in which subscribers are divided into groups, and at least one guide is registered in each group. A first step of integrating multiple groups into one super group, If a call transfer is requested from an external subscriber (hereinafter referred to as a calling party) received according to a specific guide of a first group belonging to the super group to a guide registered in another group (hereinafter referred to as a second group), the second call is requested. A second step of calling the corresponding guide in the group, A third step of determining whether the second group belongs to the same super group as the first group when receiving a response from the corresponding guide of the second group; As a result of the determination in the third step, if the second group belongs to the same super group as the first group, a call path between the calling party and the corresponding guide of the second group is requested after requesting the exit of the corresponding guide of the first group. The fourth step of connecting the call transfer method between the other groups of the electro-electric switch characterized in that it is provided. The method of claim 1, And outputting a call rejection message to a corresponding guide of the first group if the second group does not belong to the same super group as the determination result of the third step. Method of call transfer between different groups of electronic exchange.

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