JPS61214837A - Multimedium communication system - Google Patents

Abstract

PURPOSE:To cope with a new terminal easily by designating another terminal of the other party and calling it when a terminal equipment which is in course of communication requires another communication channel. CONSTITUTION:First, a terminal A of a subscriber's line 1 adds a subaddress (a) of the terminal A itself to the first call and transmits the first call to reserve one communication channel between the terminal A and one of terminals D-F of a subscriber's line 2 and performs the communication. Next, the terminal A designates a subaddress (e) of the terminal E and transmits the second call to reserve the second communication channel (for picture). Since the subaddress (e) is designated in the terminating signal to the subscriber's line 2, terminals D and F ignore the signal, and only the terminal E having the subaddress (e) responds to the signal.

Description

[Detailed Description of the Invention] [Summary] A communication method between multimedia terminals connected to a digital subscriber line, in which subaddresses are exchanged with each other during initial call origination and response, and one communication channel is used. When another communication channel is required, a second call is made by specifying the subaddress of the other party's terminal, and the second communication channel is secured. This allows two communication channels to be secured between multimedia terminals using existing communication procedures.

[Industrial Field of Application] The present invention relates to a communication system between multimedia terminals connected to a digital subscriber line.

With recent advances in digital technology, the digitalization of transmission lines and switchboards is progressing, and digital networks that combine these digital facilities are making it possible to
l5DN, which primarily provides various non-telephone services (
The concept of a comprehensive digital service network was born.

According to CCITT's Digital Subscriber Line Signaling Recommendations, two communication channels (64
It is connected by a subscriber line consisting of a control signal channel (16 Kbps, hereinafter referred to as D channel) for passing control signals.

Therefore, this may be expressed as B+B+D.

In a normal telephone, it is sufficient to use one B channel per call, but in so-called new media terminals, for example, the stroke communication terminal shown in Fig. 3, which communicates using voice and screen at the same time. Thus, even one call may use two B channels for communication.

The present invention relates to a communication procedure in such a case.

[Prior Art] In communication between multimedia terminals as described above,
Either you secure two B channels when making a call, or you initially communicate using one B channel (telephone call) and then secure another B channel in the middle.
A communication procedure that is different from that for general calls must be prepared.

[Problems to be Solved by the Invention] As described above, preparing new communication procedures for new terminals is not a good idea considering the amount of control program development.

The present invention attempts to provide a new method for connecting two B channels using existing procedures as much as possible.

[Means for Solving the Problems] FIG. 1 shows an example of the communication procedure of the multimedia communication system of the present invention.

The communication procedure between the terminal device, the exchange, and the terminal device will be explained in accordance with the control sequence as follows.

■Make a call from terminal A to terminal B. At this time, it adds its own subaddress a as additional information and sends the call.

■The exchange returns an outgoing call acceptance to terminal A and sends an incoming call signal to terminal B. This signal contains the subaddress a of calling terminal A.
is added.

(2) When terminal B receives this incoming signal, it memorizes the subaddress a of terminal A and sends back an acknowledgment of incoming call. The incoming call reception reaches terminal A via the exchange.

(2) Terminal B then adds its own subaddress b and sends out a response signal. The response signal passes through the exchange and is sent to terminal A.
reach. The terminal stores the subaddress b of terminal B.

As described above, one B is created between terminal A and terminal B.
Channel is secured.

Subsequently, when another B channel is required, ■Terminal A specifies subaddress b of terminal B and uses the second B channel.
Make a call.

(2) The exchange returns a call acceptance to terminal A, and also sends an incoming signal to terminal B, specifying subaddress b.

(2) Terminal B at subaddress b sends a response signal, which is delivered to terminal A via the exchange.

■Terminal B may make a second call to secure another B channel.

As described above, between terminal A and terminal B, two B
Channel is secured.

[Operation] In this communication method, a call is first made using one B channel (for voice) like a general terminal, and then a new terminal is specified and the call is made like a general telephone. By making a call, an attempt is made to secure another B channel (for screen use).

That is, although two B channels are used for one call in this way, by processing it as if there were two normal calls, it is possible to accommodate new terminals relatively easily.

[Example] The gist of the present invention will be specifically explained below with reference to the communication procedure diagram shown in FIG. 1 and the example shown in FIG.

Figure 2 shows three terminals A with subaddresses a, b, and c.
Subaddresses d and e are connected to subscriber line 1 having subaddresses B and C via exchange DX.

2 is a diagram showing an example of a communication procedure between a subscriber line 2 having three terminals f, E and F; FIG.

Each terminal connected to both subscriber lines is
Assume that it is a stroke communication terminal as shown in the figure.

Figure 2 (al is a call made from terminal A on subscriber line 1, adding its own subaddress a, and making the first call to any terminal on subscriber line 2. This indicates that one communication channel (for audio) is secured for a phone call.

On the subscriber line 2, one terminal E happens to respond to this incoming call by adding its own subaddress e.

If communication by voice only is sufficient, it is sufficient to continue using one communication channel (for voice).

When it becomes necessary to use stroke communication, another communication channel is acquired as follows.

Figure 2 (bl is the subaddress e from terminal A to terminal E
A second call is made specifying the second communication channel (
(for screen).

Since the incoming signal to subscriber line 2 has a designation of sub-address e, terminals F and F ignore this, and only terminal E with sub-address e responds.

[Effects of the Invention] As explained above, according to the present invention, it is possible to connect two B channels between terminal devices by utilizing existing communication procedures as much as possible, and it is possible to easily support new terminal devices. This makes it possible to do this, and the practical effects are extremely large.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining the communication procedure of the present invention, FIG. 2 is a diagram for explaining an embodiment of the present invention, and FIG. 3 is a diagram for explaining stroke communication. O → 11's connoisseur calls II In theory Moe /I! 7 (b) ∆<, f Rotsuki no Mi o self-divided brush stroke communication g81 figure %3 z

Claims (1)

[Claims] In a digital network consisting of an exchange and a terminal device connected to the exchange via a digital subscriber line, one terminal device can communicate with one other party's terminal device and one other party's terminal device by making an initial call. When connected via a communication channel, mutual subaddresses are exchanged, and when the terminal device in communication requires a new communication channel in addition to the communication channel currently in use, it is notified by the exchange. A multimedia communication system characterized by being configured to generate a new call by specifying the subaddress of the called party's terminal device.