JPH057257A - Channel control method for isdn composite terminal - Google Patents

Abstract

PURPOSE:To make the number of channels required another communication functon available even when several channels of an ISDN composite terminal are used by one communication function. CONSTITUTION:When an incoming call is received from another facsimile device while a video telephone function 2 is using two B channels in the basic interface of an ISDN, a facsimile function 3 transmits a request message for receiving the incoming call to a monitor function 1, and the monitor function 1 transmits a request message for switching a mode to the video telephone function 2. The video telephone function 2 transmits the request message for switching the mode to an opposite video telephone terminal and changes over the mode so as to enable the communicaton on one B channel. Then it releases the B channel not any more being used ans transmits a mode switchig end message to the monitor function 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel control system for ISDN composite terminals.

[0002]

2. Description of the Related Art In ISDN, for example, the basic interface is 2B + D and the primary group speed interface is H.
_{The 0} channel interface has multiple information channels, such as 3H ₀ + D. Therefore, ISD
A function to transmit and receive a large amount of data (hereinafter referred to as “function a”) by simultaneously using a plurality of B channels or H channels such as N videophone and ISDN videoconference, and for example, data communication and FAX communication. Using a terminal (hereinafter, referred to as “ISDN composite terminal”) in which one or more B channels or H channels are used and a function (hereinafter, referred to as “function b”) for transmitting and receiving a relatively small amount of data is combined,
It is possible to perform communication using the function a and the function b at the same time. FIG. 6 is an explanatory diagram of an operation sequence in the basic interface of the conventional ISDN composite terminal.

Now, it is assumed that the function a of the terminal A uses all the channels of the B channel at the same time and a large amount of data is being transmitted / received to / from the terminal B. In this state, when terminal C sends a SETUP (call setup request) to the network to call terminal A,
The network sends a SETUP (call setup request) to the terminal A and a CALLPROC (CallProcee) to the terminal C.
ding: a call setting process notification) is transmitted. At this time,
Since the terminal A has no usable channel, the channel designation of SETUP transmitted from the network is “none”.

Then, the terminal A connects to the RELCOMP (R
Release Complete is returned, and the network sends DISC (Disconnectnec) to the terminal C.
t: call release request), and the other terminal C is rejected to make a call. Further, since the function b of the terminal A originates, there is no empty channel even if SETUP is sent to the network, so RELCOMP is returned from the network and released.

[0005]

However, in the above-mentioned conventional channel control system, the function b cannot perform the outgoing / incoming operation while the function a uses all the B channels. For example, function a is a videophone and function b is FAX, and the ISDN basic interface (2B +
When connected to D), there is a problem that the FAX cannot be transmitted / received from other terminals while communicating using two B channels by the videophone. In particular,
In the case of communicating by videophone, in order to improve the quality of image and sound, the communication is normally performed in the highest communication mode of the terminal, so that two B channels are used, which is a problem.

Similarly, while the function a uses all the H channels, the function b cannot perform outgoing / incoming operations. Even if the function a does not use all the B channels or the H channels, the same can be said if the number of channels required by the function b does not match. The present invention solves the above-mentioned problems, and enables one communication function of an ISDN composite terminal to use a required number of channels even when one communication function uses a plurality of channels for communication. It is an object of the present invention to provide a channel control method for the ISDN composite terminal.

[0007]

In order to solve the above problems, the present invention provides one or more Bs capable of switching the number of channels.
The first function of transmitting / receiving a large amount of data using the channel or the H channel and the second function of transmitting / receiving a relatively small amount of data using one or more B channels or the H channel independently communicate with each other. In the ISDN composite terminal to be controlled, the first function detects an incoming / outgoing call request from the second function while using a plurality of channels, and is required for the second function of the channels used by the first function. It has a monitoring function that releases a large number of channels.

[0008]

According to the present invention, since the channel control system of the ISDN composite terminal is configured as described above, the monitoring function is such that the first function uses a plurality of B channels or H channels at the same time, and a large amount of data is transmitted. Detects incoming / outgoing requests from the second function during transmission / reception, and instructs the first function to release the number of channels used by the second function that are necessary for the second function. To do.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an I according to an embodiment of the present invention.
It is a block diagram which shows the channel control system of an SDN compound terminal. This embodiment is applied to a terminal in which a videophone function and a FAX function are combined.
It is composed of an AX function 3 and a monitoring function 1 for monitoring these functions. And videophone function 2 and monitoring function 1
Exchanges a mode switching request and a mode switching completion message, and the FAX function 3 and the monitoring function 1 exchange a call origination / termination request, a call origination / termination permission, and a call release completion message.

Here, the ISDN composite terminal in the present embodiment has a basic interface I having a 2B + D structure.
Connected to the SDN, the videophone function 2 has a communication mode using two B channels and a communication mode using one B channel, and these modes can be switched during communication. Further, the FAX function 3 communicates using one B channel.

FIG. 2 is an explanatory diagram of an operation sequence in the embodiment of the present invention when the videophone function uses two B channels and there is an incoming call from another FAX during communication. In FIG. 2, when the FAX receives an incoming call to this terminal, it first sends SETUP to the network. The network sends SETUP to the terminal and returns CALLPROC to the FAX. At this time, since the terminal A has no usable channel, the SET transmitted from the network is transmitted.
Although the channel designation of UP is "None", this terminal is not used for RELCOMP as in the past but for ALERT.
(Alerting: Called party notification).

When this terminal receives SETUP, it sends 1 to the other party's videophone terminal in communication using the B channel.
A mode switching request message is transmitted so that communication can be performed with one B channel (B1 channel in FIG. 2). The mode switching request message may be included in the D channel packet. Then, after sending the mode switching request message, DISC is sent to the partner videophone terminal via the network to request release of the B2 channel, and the partner videophone terminal releases REL (Release: channel disconnection completion notification and call number release). After receiving the (request), RELCOMP is transmitted to the partner videophone terminal.

Next, the C terminal is sent to the FAX terminal via the network.
ONN (Connect: notification of callee's response) is transmitted, and the FAX terminal sends CONNACK (Co
connect Acknowledge: CONN). As a result, this terminal and the FAX terminal can communicate using the B2 channel.

FIG. 5 is a state transition diagram for explaining the operation of the monitoring function in the embodiment of the present invention. Hereinafter, FIG. 1 and FIG.
The internal operation of the terminal in the above operation sequence will be described with reference to FIG. First, when the terminal receives SETUP, the FAX function 3 sends an incoming call request message to the monitoring function 1, and the monitoring function 1 sends a mode switching request message to the videophone function 2 (step 1). Then, the monitoring function 1 becomes the status 1.

Next, the videophone function 2 that has received the mode switching request sends a mode switching request message to the other party's videophone terminal in communication using the B channel, and sends one mode B channel (B1 channel in FIG. 2). ) Change the mode so that you can communicate with. After that, the B channel that is no longer used is released, and the mode switching completion message is sent to the monitoring function 1.

Next, the monitoring function 1 is set to F after completion of mode switching.
FA which notified the AX function 3 of the incoming permission and received this
The X function 3 responds to the incoming fax (step 2). FIG. 3 is an operation sequence explanatory diagram in the case where the videophone function and the FAX function are simultaneously communicating with each other and the FAX function ends the communication and releases the used B channel in the embodiment of the present invention.

Since the procedure for releasing and setting the call in this operation sequence is the same as in the case of FIG. 2, its explanation is omitted.
The operation inside the terminal will be described with reference to FIGS. First, the monitoring function 1 sends a mode switching request message to the videophone function 2 after receiving the call release completion (step 3). Next, after receiving the mode switching request, the videophone function 2 sends a mode switching request to the other party's videophone terminal in communication using the B channel, and notifies the other videophone terminal to communicate with the two B channels. Make a call to the other party's videophone terminal. After calling and connecting the call, videophone function 2
Communicate with two B channels B1 and B2.

FIG. 4 shows an embodiment of the present invention in which when the videophone function uses two B channels to communicate, F
It is an operation sequence explanatory view when an AX function transmits. Also in this operation sequence, step 1 in FIG.
As shown in FIGS. 3 to 3, if the FAX function 3 sends a call origination request to the monitoring function 1, the monitoring function 1 allocates the B channel in the same manner as in FIG.

As described above, according to the present invention, even if the videophone function 2 communicates using the two B channels, the FAX call is accepted and the operator unknowingly receives the B of the videophone. One of the channels is released, FAX communication is performed on the vacant B channel, and after the FAX communication ends, the number of videophone channels is unknowingly returned to the original two channels. When the videophone function 2 is communicating using two B channels, the FAX function 3
The same applies when the call originates.

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention, and these modifications are not excluded from the scope of the present invention.

[0021]

As described above in detail, according to the present invention, when one communication function in the ISDN composite terminal is communicating using a large number of channels, other communication functions are required. When trying to use a channel, an operator can allocate a required channel without performing a special operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing a channel control method of an ISDN composite terminal according to an embodiment of the present invention.

FIG. 2 shows a videophone function of 2 in an embodiment of the present invention.
Uses one B-channel and another FAX when communicating
FIG. 8 is an explanatory diagram of an operation sequence when there is an incoming call from the user.

FIG. 3 shows a videophone function and F in the embodiment of the present invention.
FIG. 9 is an operation sequence explanatory diagram in a case where the AX function is communicating at the same time, the FAX function ends the communication, and releases the used B channel.

FIG. 4 shows a videophone function of 2 in the embodiment of the present invention.
FIG. 9 is an operation sequence explanatory diagram in the case where a FAX function makes a call when communicating using one B channel.

FIG. 5 is a state transition diagram illustrating the operation of the monitoring function according to the embodiment of this invention.

FIG. 6 is an explanatory diagram of an operation sequence in a basic interface of a conventional ISDN composite terminal.

[Explanation of symbols]

 1 Monitoring function 2 Videophone function 3 FAX function

Claims (1)

Claim: What is claimed is: 1. A first function for transmitting and receiving a large amount of data using one or more B channels or H channels capable of switching the number of channels, and one or more B channels or H channels. In the ISDN composite terminal in which the second function for transmitting and receiving a relatively small amount of data is controlled independently of each other in the ISDN composite terminal, the second function is used while the plurality of channels are simultaneously used. ISDN composite terminal, which is provided with a monitoring function for detecting an incoming / outgoing call request from the terminal and releasing the number of channels required for the second function among the channels used by the first function. Channel control method.