JPS61196658A - Speech channel release control system - Google Patents

Abstract

PURPOSE:To intend the reduction in release signal processing circuit or software processing on this, by detecting that a receiver is made with on-hook and make a release signal to notify this unnecessary, in a telephone switchboard of in- channel control system. CONSTITUTION:The telephone switchboards 1A and 1B are connected through a channel 4, and a telephone set 2A of a subscriber is in the service state with telephone set 2A of a subscriber is in the service state with a telephone set 2B. When the ring-off is made and, for example, the telephone set 2A side hooking the receive, the switchboard 1A detects this, and transmits an idle signal (NSP) to indicate the unused state of the channel n succession to a voice data to the switchboard 1B that is a posterior call station. Here, when indicating a digital signal transmitted to the channel as frame sequence, after a voice frame continues, the ring-off is performed, and then an idle frame including the idle signal continues. The switchboard 1B that is a receiving station detects always a deciding flag of this frame, and identifies whether the frame is the voice frame or the idle signal. In case of idle signal, when receiving it at a determined frequency continuously, a related service channel is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an inter-office connection control method 15 of a telephone exchange device, and particularly to call channel recovery control that performs connection/disconnection processing using an in-channel control method.

It is related to the method.

[Background of the invention]

In the interoffice signal transfer system of the telephone exchange, control signals are transferred separately from the communication path 20 (communication channel).

(out channel control method)
Or out-channel control and multiple.

Common line signaling system and calls that commonly control lines.

There is an in-channel control method in which connection control signals are transferred using the same communication path. Outcha.

The best practice is to install a separate signal line for channel control.

If it is not economically advisable (inter-office traffic is small,

In case the distance between the stations is large), use Incha.

A channel control method is used. The present invention relates to a recovery processing method in the latter in-channel control method. The recovery process in the in-channel control method is to detect when the handset is on-hook.

A well-known method is to detect a recovery signal and transfer the recovery/recovery confirmation signal to notify the other station, and then the station side receives and identifies the signal and proceeds to disconnection processing.

As a prior art in this field, the Telecommunications Association.

There are techniques described in the ``Exchange Method'' (authored by Reiji Fukutomi) published by the association.

purpose of the invention] The object of the present invention is to provide an in-channel control system.

At the telephone switching device, the handset was placed on-hook.

It detects this and sends a recovery signal to notify you of this.

In this way, the recovery signal processing circuit 5 or related software processing can be reduced.

There are many things.

[Summary of the invention]

The present invention detects when the handset is on-hook.

In order to eliminate the need for a recovery signal to notify this, a no-call signal (NSP'), which means that the channel between switching devices is unused, is sent, and the receiving switching device When receiving this NSP/Continuous NSP
The number of frames is counted, and if a certain number of frames have been received, the process moves to disconnection and 15 channels are opened, and if the number of frames is not reached, the call mode is reached.

Control force for call channel recovery to continue.

Features the formula.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained using the drawings.

In FIG. 1, telephone exchanges IA and IB are connected via a transmission line 4.

FIG. .

Two subscriber telephones are connected using known connection methods.

1A-Modem 6A-Transmission line 4-Modem 3B-Device 1B5
It is in a conversation state with telephone 2B via the terminal. For example, at the end of the talk.

For example, when two telephone users hang up, the exchange equipment IA' detects this and transmits the voice data to the channel.

No Call Signal (NSP) to indicate when the phone is not in use
The subsequent caller continuously transmits 10 to the switching device 1B, which is a station.

Figure 2 shows digital signals transferred through a transmission line.

FIG.

In this example, the voice frame continues and then the call ends, and then the no-call frame including the no-call signal continues<15 state.

FIG. 5 shows the frame structure of each frame.

The frame indicates the voice/NSP distinction.

judgment flag 5 and voice data or NSP field.

In this case, it consists of a total of 101 data fields 6 and 2°, 3.

Ru. The switching device 1B, which is a receiving station, receives this frame.

The determination flag is constantly detected to identify whether the frame in question is an audio/voice frame or a no-call signal. No call.

In the case of a signal, it is received a certain number of times in succession.

When this occurs, the associated call channel will be opened. 5. Furthermore, if the number of no-call signals is less than or equal to a certain number of times, the switching device continues the call mode. - [Effects of the Invention] According to the present invention, since the communication channel is released when the no-call signal is counted a certain number of times, the recovery signal No. 10 is not required, and the recovery signal processing circuit or the related circuit is not required.

The effect is that the associated software processing can be reduced.

There is fruit.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the structure of the network, FIG. 2 is a diagram showing the frame sequence, and FIG. 3 is a diagram showing the frame structure. IA, IB...Telephone exchange equipment, 2A, 2B...Telephone, 3A, 5B...Modem, 4...Transmission line.・ 4 ・ Figure 1'Tower 2 Figure 3

Claims (1)

[Claims] In a telephone switching device based on an in-channel control method that handles digitized voice, when the receiving side switching device receives a no-call signal (NSP) indicating that the channel between the switching devices is in an unused state, the switching device transmits a continuous NSP signal. A call channel recovery control method characterized in that the number of frames is counted, and when a certain number of frames is reached, a disconnection process is performed, and when the number of frames is not reached, a call mode is continued.