JPH1023506A - Representative telephone system in mca system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a busy state even when a terminal device with a representative number is called by a off-hook operation by transmitting state information on a terminal device to a base station side over a control channel. SOLUTION: Each terminal device sends state information showing its on- hook or off-hook state to a line control unit of the base station and the line control unit detects the on-hook state of the terminal device and performs control so that channel specification will not be given to the terminal device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a representative telephone function of an MCA system for transmitting data between a base station and a terminal device via a control channel.

[0002]

2. Description of the Related Art In a conventional representative telephone system, when a call is made to a first terminal having a representative number, a line controller of a base station calls a terminal having the smallest number. I have. If the terminal with the lowest number is busy, the line control device recognizes that the terminal is busy and calls the next terminal. At this time, the line controller receives the representative telephone number of the call requesting party, but converts the number into the number of the terminal to be actually called when calling.
Hereinafter, the representative function operates until all the terminals forming the representative telephone are busy. Here, the function of the main phone is
This is a function in which the line control device recognizes that the corresponding terminal is busy, and calls the next terminal.

[0003]

However, the above-mentioned prior art has the following problems. Since the line control side cannot recognize that the terminal associated with the called party's representative number is off-hook, for example, while the head terminal is off-hook, the terminal is busy calling the terminal. There was a problem. In this case, a state where the call cannot be made even though other terminals are vacant. An object of the present invention is to prevent off-hook state of a terminal having a representative number from being busy by transmitting off-hook state information of a terminal device to a line controller via a control channel. .

[0004]

According to the present invention, in order to achieve the above object, a terminal device transmits status information indicating on-hook or off-hook to a line control device of a base station by using a control channel. The side recognizes off-hook even when the corresponding terminal is not in a call, and controls so as to call the next terminal. As a result, the line controller controlling the function of the representative telephone receives and detects the off-hook state information via the control channel when the terminal is in the off-hook state. Accordingly, when a call is made to the terminal, the line control device can detect the off-hook of the terminal and call the next terminal.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the sequence diagram of FIG. In the present embodiment, a case where the head number 1001 of the representative telephone is in an off-hook state will be described as an example. When the representative number is called from the terminal A, the line control device returns the hold data to the terminal A, and the terminal A enters a hold state of waiting for channel designation data on the control channel by receiving the hold data. The line control device issues a response request to the first terminal 1001, but does not receive a response because the corresponding terminal is in an off-hook state, and sends a response request to the next terminal 1002 to obtain a response. Then, the channel is transmitted to the terminal A and the terminal 1002 to establish a line.

Next, when the representative number is called from the terminal B, the line controller similarly sends the hold data to the terminal B, and the terminal B also receives the hold data and waits for the channel designation data on the control channel. It is put on hold. The line control device controls the calling terminals to be sequentially turned by a cyclic method, and issues a response request to the terminal 1003. If the terminal 1003 is in the off-hook state, a response cannot be obtained, and a response request is sent to the next terminal 1004. If a response is obtained, channel designation data is sent to the terminal B and the terminal 1004, The line is established.

[0007]

As described above, according to the present invention, for example, when the first terminal of the representative number is off-hook and a call is made to the representative number, the line control device makes the corresponding terminal off-hook. , It is possible to call the next terminal. For this reason, in response to the call of the representative number, the head terminal is called, and the problem of the busy state can be eliminated.

[Brief description of the drawings]

FIG. 1 is an operation sequence diagram showing one embodiment of the present invention.

[Explanation of symbols]

 1001 to 1004 ... representative telephones.

Claims (2)

[Claims] In an MCA system comprising a base station and a plurality of terminal devices, on-hook or off-hook status information of the terminal device is transmitted to a line control device of the base station via a control channel, and a representative telephone set is transmitted. Call to a terminal device
When the terminal device is off-hook, the line control device detects that the terminal device is off-hook and controls to call another terminal device. 2. A representative telephone system in the MCA system according to claim 1, wherein a terminal device included in said representative number is turned cyclically in turn each time a representative telephone is called. A representative telephone system in an MCA system, characterized in that: