KR0164403B1 - Method for number translation in telephoe exchanger - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

It is a technology for calling method by translating extension in public exchange system connected to VMS.

2. Technical problem to be solved by the invention

In case of accepting more subscribers than the number of subscriber numbers allocated from the public telephone network (PSTN), the subscriber numbers can be extended to use more subscriber numbers inside the exchange.

3. Summary of Solution to Invention

It accepts a number of extension numbers from the public telephone network, and when the CO subscriber calls another CO subscriber, VMS accepts the call and inputs the extension number. When the extension number is received, the received extension number is returned to the exchange. After translating and translating the number, the calling channel is formed between the called CO subscriber and the subscriber.

4. Important uses of the invention

Applies to the exchange system to which the VMS is connected.

Description

Call method by translating extension number in exchange system

1 is a block diagram of an exchange system according to the present invention.

2 is a detailed block diagram of an exchange system according to the present invention.

3 is a control flow chart for forming a communication path with an extension subscriber when a trunk line subscriber makes a call through a public telephone network according to the present invention.

The present invention relates to a method for translating an extension number in a public switching system, and in particular, provides a telephone service for subscribers using an extension number in addition to subscribers having a number from a public telephone network in a public switching system. It relates to a call method by extension translation.

The public exchange (TDX-1B) currently in use requires that 100 channels are allocated to the PSTN network. Therefore, the public exchange (TDX-1B) cannot accept more subscribers because only 100 subscribers are allocated from the public switched telephone network (PSTN), so if it wants to accommodate more subscribers than the number of allocated subscriber numbers, In the TDX-1B, multiple extension subscribers should be assigned to one number assigned to the PSTN network, but there was no function to receive and translate the extension number for calls originating from the external public network exchange. .

Therefore, in order to use a plurality of extension numbers in one number assigned to a PSTN in a public exchange (TDX-1B), the function of receiving and translating additional numbers from the corresponding exchange needs to find a final subscriber.

Accordingly, an object of the present invention is to translate an extension number in an exchange system that receives an extension number in a public exchange system and performs a phone service by receiving a subscriber using an extension number in addition to the subscriber who has been given a number from a public telephone network. The present invention provides a method of calling.

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

1 is a block diagram of an exchange system according to the present invention, which includes a switching and numbering processor (SNP), and includes a central processing unit 10 that performs an exchange function and an overall control operation of the exchange system. And a built-in control program for translating the extension number according to the present invention, and a memory system 20 for temporarily storing data generated during program execution, and at the same time supplying a talk current in a voice band to the subscriber. A subscriber circuit 30 for interfacing the communication circuit, a switching circuit 40 for switching various tone signals and voice data under the control of the central processing unit 10, and a trunk line under the control of the central processing unit 10. A trunk circuit 50 for interfacing the incoming signal from the trunk line, and a VMS line under the control of the central processing unit 10. A predetermined input signal, a response signal in response to the received signal, and a VMS subscriber circuit 60 for interfacing the VMS lines between other switching systems, and a signal that is incoming under the control of the central processing unit 10. It is composed of a VMS (70) for transmitting a response signal according to, and receiving and storing the extension number dialed by the extension subscriber, and transmits the received extension number to the exchange.

2 is a detailed block diagram of an exchange system according to the present invention. The trunk circuit 50 of FIG. 1 includes a trunk line control processor (TLS) 52 for controlling a trunk line, The time switch is generated by generating various tone signals under the control of the trunk line matching circuit 51 and the trunk line control processor 52 which are connected to a telephone network to form a trunk line loop by calibrating trunk lines and matching signals coming from the trunk lines. A tone supply device 53 for outputting to 55, an R2 signal receiver 54 for receiving a signal for calling a switch and another exchange period under the control of the trunk line control processor 52, and the trunk line And a time switch 55 for switching the trunk line, the station subscriber, and the VMS subscriber under the control of the control processor 52, and the subscriber circuit 30 is configured to control the station line. A Subscriber Line Control Processor (SLP) 32, a subscriber matching circuit 31 connected to the subscriber subscriber line to calibrate the extension to form an extension loop and matching signals coming from the extension; Under the control of the subscriber line control processor 32, the tone supply device 33 for generating various tone signals and outputting them to the time switch 35, and the extension subscribers and trunk lines under the control of the subscriber line control processor 32; And a time switch 35 for switching VMS subscribers, and a ring supply device 36 for supplying a ring signal to the subscriber matching circuit 31 under the control of the subscriber line control processor 32. Subscriber circuit 60 is a Subscriber Line Control Processor (SLP) 62 for controlling a VMS line.

And a subscriber matching circuit 61 connected to the VMS subscriber line to form a VMS loop to match the signals coming from the VMS line, and various tones under the control of the subscriber line control processor 62. The tone supply device 63 for generating a signal and outputting the signal to the time switch 65, and the time switch 65 for switching the subscriber line, the trunk line and the VMS subscriber under the control of the subscriber line control processor 62. And a ring supply device 66 for supplying a ring signal to the subscriber matching circuit 61 under the control of the subscriber line control processor 62.

3 is a control flowchart for forming a call path with an extension subscriber when a trunk line subscriber makes a call through a public telephone network according to the present invention.

One preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 and 3 above.

The switching system TDX-1B shown in FIG. 1 is capable of connecting up to 100 subscribers to the trunk circuit 50 connected to the PSTN network, and the subscriber circuit 30 is capable of accommodating up to 100 to 20 million subscribers. Therefore, more than 100 subscribers connected to TDX-1B's subscriber circuit (30) can only receive up to 100 subscribers when making a call to the PSTN network. In order to receive service for more than 100 subscribers connected to subscriber circuit 30, a plurality of extension numbers 195-3333, 195-3334, 195-3335, etc. are assigned to 933-2000, for example, and connected to PSTN network. When the subscriber calls the number of 933-2000, this call is unconditionally connected to the VMS 70, and a message is sent to enter the extension number. For example, when 195-3334 is pressed, the PSTN network This is to connect the calling party with the subscriber of extension 195-3334.

This operation will be described in detail with reference to FIGS. 2 and 3 to allow a CO subscriber to dial a VMS subscriber number, for example, 933-2000, which is a representative number connected to the VMS 70 via a public telephone network (PSTN). When the trunk line control processor 52 translates the number through the R2 signal receiver 54 and applies it to the CPU 10. The central processing unit 10 makes an incoming request to the subscriber line control processor 62. At this time, the subscriber line control processor 62 sends a switch connection request signal to the central processing unit 10 so that the calling party and the VMS 70 are connected. The CPU 10 receiving the switch connection request signal controls the switching circuit 40 to switch and transmits a switching connection completion signal to the subscriber line control processor 62. The subscriber line control processor 62 then controls the ring supply device 66 to send the ring signal to the VMS 70 and the ring start information to the trunk line control processor 52. The trunk line control processor 52 then controls the tone supply device 53 to transmit ringback tones to the subscriber side via the public switched telephone network (PSTN). The VMS 70 then hooks off and sends a response message to the subscriber line control processor 62. At this time, the subscriber line control processor 62 sends this response message to the trunk line control processor 52. The response message is the announcement message Continue to dial extension. At this time, when the subscriber hears the announcement and dials the extension number of the extension subscriber who wants to make the final call, for example, 195-3333, the VMS 70 receives and stores the dial number and hook-flashes the subscriber line control processor ( 62, a holding request signal is sent to the trunk line control processor 52.

Then, the subscriber line control processor 62 controls the tone supply device 53 to transmit the standby sound. The subscriber line control processor 62 controls the tone supply device 63 to transmit a dial tone to the VMS 70. After receiving the dial tone, the VMS 70 sends 195-3333, the digit of the received dial number, to the subscriber line control processor 62. The subscriber line control processor 62 requests the number translation to the central processing unit 10. Do Then, the central processing unit 10 makes an incoming request to the subscriber line control processor 32. At this time, the subscriber line control processor 32 makes a switching request, and the central processing unit 10 receiving the switching request controls the switching circuit 40 so as to be connected to the subscriber circuit 30 and controls the switching completion signal to the subscriber line. The processor 32 sends the signal to the processor 32. Then, the subscriber line processor 32 transmits the ring start information to the subscriber line control processor 62 and then controls the ring supply device 36 to transmit the ring signal to the subscriber, that is, 195-3333, and the tone supply device ( 33) to transmit the ringback tone to the VMS 70. At this time, the VMS 70 recovers the line (HOOK ON) and the subscriber line control processor 62 enters the idle state (IDLE). The subscriber line control processor 62 transmits a call transfer request signal to the subscriber line control processor 32 and the central processing unit 10. The central processing unit 10 receiving the call transfer request transmits a ringback tone to the subscribers of the trunk line via a public telephone network (PSTN). At this time, the subscriber line control processor 32 requests the switching to the central processing unit 10, the central processing unit 10 receives the switching request to control the switching circuit 40 to be connected to the subscriber circuit 30, The switching completion signal is sent to the subscriber line control processor 32. When the subscriber hooks off, the subscriber line processor 32 notifies the central processing unit 10 of the response signal indicating that the subscriber has hooked off, thereby making a call between the trunk line subscriber and the subscriber.

As described above, the present invention accepts a plurality of extension numbers in a number given from a public telephone network so that when a CO subscriber calls another CO subscriber, the VMS receives a call and inputs an extension number when the extension number is received. By sending the extension number back to the exchange and translating the number to form a call path between the called CO subscriber and the extension subscriber, there is an advantage in that it can talk to a plurality of extension subscribers using a limited CO line.

Claims (2)

In a call method by translating an extension number of a switching system connected to a VMS, a subscriber line is called through a public telephone network and a call is made to dial an extension number in response to the VMS when a call is made to the representative phone number connected to the VMS. Transmitting a call, hooking flash when receiving the extension subscriber number in the VMS after transmitting the announcement, receiving a dial tone from the switching system, and receiving the extension subscriber number when the dial tone is received from the switching system. Retransmitting to the exchange system, translating the retransmitted extension subscriber number in the exchange system, sending a ring signal to the corresponding subscriber, sending a ringback tone to the VMS, and receiving a ringback tone from the VMS. When hooking on to call and recover the idle state, and in the VMS When it is restored to these states, the exchange system converts the extension number of the VMS-connected exchange system, which comprises a process of forming a call by connecting a call path between a trunk line subscriber and an extension subscriber called through the public telephone network. Call method by. The process of claim 1, wherein the announcement broadcasting process comprises: translating a number in the exchange system when a call is made to a representative telephone number connected to the VMS, and transmitting a ring to the VMS after translating the number. And transmitting a guide broadcast for inputting an extension subscriber number when the ring signal is received by the VMS.