JPH0429456A - Isdn communication terminal call issuing method - Google Patents

Abstract

PURPOSE:To omit a re-call issuing operation by a user by issuing a call by automatically changing the setting of a mode to an existing telephone mode when the call is issued in a television telephone mode to an existing telephone set, and enabling speech in voice to be performed in a television telephone terminal. CONSTITUTION:Firstly, the user of an ISDN terminal inputs a subscriber number attached on the existing telephone set from the input part 5 of the ISDN terminal after performing off-hook to issue the call to the existing telephone set in the television telephone mode. Call setting diffusal is transferred from an existing network, and an ISDN network transmits a DISK message to the ISDN terminal. A call control part 8 sets the content of a transmission capacity element at existing mode sound since a re-call is issued in the existing telephone mode. When the ISDN network transfers a call setting request to a communication network which houses the existing telephone set according to an incoming number information element in a SETUP message transmitted via a line 10, the existing network transfer call setting acceptance to the ISDN network, and sends a ringer tone to the existing telephone set.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention has multiple calling modes including μm1aW encoding audio, such as videophone terminals and multimedia terminals that can be connected to an ISDN communication network. This relates to a method for not calling an ISDN communication end.

[Conventional technology]

FIG. 4 shows, for example, [Video information
ISD that can be connected to the ISDN communication network (hereinafter abbreviated as the ISDN network) in the "Digital TV phone Omnimate 10" featured in the September 1988 issue of J
The internal block configuration of an N communication terminal (hereinafter abbreviated as an ISDN terminal) is shown.

In the figure, (1) is an ISDN terminal, (2) is a camera that displays the user of the terminal, (31 is a monitor that displays the other party's image and calling number, and (4) is a monitor that displays local tones such as ringback tone and busy tone. (5) is the input section for the subscriber number of the other party, (6) is the handset for voice communication, (7) is the coDEci8]L that encodes and decodes each video and audio data. - A call control unit that controls calls such as incoming calls; (9) is a storage unit for storing the subscriber number of the other party who made a call immediately before; al is a line that connects the call control unit and the ISDN network.

Next, the operation will be explained. FIG. 3 shows the calling sequence of the lSDN terminal when the mode setting is changed.

First, in order for an ISDN terminal user to make a call to an existing telephone in videophone mode, after off-hook, the ISD
Enter the subscriber number given to the existing telephone from the input section (5) of the N terminal. When you finish entering the number, the call control unit (8
) sends a 5ETUP message with unrestricted data as the content of the transmission capability information element to make a videophone call to the ISDN network via the line α1. IS
The DN network forwards the call setup request to the communication network accommodating the existing telephone according to the called party number information element in this 5ETUP message, but since the communication network accommodating the existing telephone is an analog existing network, it is an unrestricted digital network. Communication is not possible. Therefore, the call establishment rejection is forwarded from the existing network, and the I
The SDN network sends a DISC message to the ISDN terminal. When the user hears a busy tone from the earbud of the handset (6) or the speaker (4) of his/her own terminal, the user becomes aware of the failure of the call and goes on-hook. Next, make sure that the other party does not own a terminal that has an ISDN network connection function that allows mutual communication with an ISDN terminal in videophone mode, or that the subscriber number is ISDN! Assuming that it is a telephone terminal connected to an existing network rather than a terminal connected to
Input the existing telephone mode from the input section (5) of the DN terminal. When the user changes settings to the existing telephone mode and instructs a re-call, the call control unit (8) stores the subscriber number of the called party at the time of the last call from the storage unit (9) as the called party number information element. μmla to communicate in existing telephone mode.
w Voice is included in the transmission capability information element, and a 5ETUP message is sent to the rsDN network via the line head.

When the ISDN network transfers a call setup request to the communication network accommodating the existing telephone according to the called number information element in this 5ETUP message, the existing network transfers the call setup acceptance to the ISDN network and transfers the call setup request to the existing telephone. It sends out a ringer tone. When the user of the existing telephone sets transmit/receive l#(6), voice communication is started between the ISDN terminal and the existing telephone set.

[Problem to be solved by the invention]

The call origination method of conventional ISDN communication terminals has the above-mentioned call origination sequence, so when a call is made in videophone mode to a terminal accommodated in the existing network, the connection cannot be established.
If the user determines that the call has failed due to a wrong mode setting, the user must change the setting to the existing phone mode and call again, which poses a problem in that the operation for re-calling is cumbersome. .

This invention was made in order to solve the above-mentioned problems, and when the call setting is rejected at the time of making a call, it is possible to automatically change the call mode setting and re-call using the function of the terminal. The object of the present invention is to obtain a method for calling an ISDN communication terminal that guarantees at least voice communication in a communication terminal having a telephone function.

[Means to solve the problem]

The ISDN communication end call cancellation method according to the present invention transmits a 5ETUP message containing unrestricted digital data in the transmission capability information element, and when the message is rejected, the automatic mode setting change function changes the contents of the transmission capability information element. μ−1
The message is changed to aw voice and the 5ETUP message is sent.

[Effect]

In this invention, the ISDN communication terminal non-call method is
When receiving a call rejection from the N network, the setting is automatically changed to the existing telephone mode, and the number of the subscriber to whom the call was made immediately before is read out from the storage section, and the call is made again.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

In the figure, (1) is an ISDN terminal, (2) is a camera that displays the user of the terminal, (3) is a monitor that displays the image of the other party and the calling number, and (4) is a local tone such as a ringback tone or busy tone. (5) is the input section for the subscriber number of the other party, (6) is the handset for voice communication, and (7) is the C0DEC1 (8) that encodes and decodes each video and audio data. A call control unit that controls call control such as outgoing and incoming calls, (9) is a storage unit that stores the subscriber number of the other party who made a call just before, and (11) is a unit that automatically controls calls when a call is rejected from the ISDN network. A re-calling processing unit changes the setting to the existing telephone mode and reads out the subscriber number of the last called party from the storage unit (9) for re-calling. αα is a line connecting the call control unit and the ISDN network. It is.

Next, the operation will be explained. FIG. 1 shows a calling sequence in the case where the mode setting is automatically changed by the function of the terminal and a call is made again, and the following description will be based on this sequence.

First, in order for the user of the ISDN terminal to make a call to the existing telephone in videophone mode, after off-hook, the ISDN
Enter the subscriber number given to the existing telephone from the input section (5) of the DN terminal. When you finish entering the number, the call control unit (
8) A 5ETUP message is sent via the line to the ISDN network in order to make a videophone call, with the content of the transmission capability information element being unrestricted data. I
The SDN network uses 1111 in this 5ETUP message.
Information 1 [The call setup request is transferred to the communication network accommodating the existing telephone according to the element, but since the communication network accommodating the existing telephone is an analog existing network, unrestricted digital communication is not possible. Therefore, the call setup rejection is transferred from the existing network, and the ISDN network sends a DISC message to the ISDN terminal. The call control unit (8) of the ISDN terminal transmits the DISC message to the re-call processing unit (11) and starts a call release procedure for the ISDN network. When the re-call processing unit (11) recognizes the rejection of the call from the content of the DISC message, it automatically sets the mode to the existing telephone mode and reads out the subscriber number of the other party who made the call immediately before from the storage unit (9). , instructs the call control unit (8) to re-call, and also instructs the CODE C (7) to display on the monitor (3) that the mode has been changed and that the re-call has been made. In the call control unit (8), in order to make a re-call in the existing telephone mode, the content of the transmission capability information element is set to μmlaw voice,
The subscriber number of the other party read out from the storage section is put in the called number information element and a 5ETUP message is transmitted. ISDN
When the network forwards the call setup request to the communications network accommodating the existing telephone according to the called number information element in the 5ETUP message sent via the line, the existing network
The call setup reception is transferred to the SDN network, and a ringer tone is sent to the existing telephone. When the user of the existing telephone goes off-hook, voice communication begins between the ISDN terminal and the existing telephone.

In the above embodiment, the first call is made in the videophone mode, but any mode other than the existing telephone mode may be used, and it is also possible to display the mode change on the monitor when making a second call. As shown above, any method may be used as long as it is understandable to the user.

〔Effect of the invention〕

As described above, according to the present invention, when a call to an ISDN communication terminal is rejected, the contents of the transmission capability information element are
Since the configuration is configured to change the settings to RAW audio, it is possible to omit the re-calling operation by the user, and there is an effect that voice communication is possible if the called party has a terminal having a communication function using μm RAW audio encoding.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a calling sequence when an ISDN communication terminal according to an embodiment of the present invention automatically re-calls after changing the mode setting, and FIG. 2 is a diagram showing internal blocks of the terminal according to an embodiment of the present invention. FIG. 3 is a diagram showing the conventional calling sequence when a user changes the mode setting and calls again, and FIG. 4 is a diagram showing the internal block configuration of a conventional terminal. In the figure, (1) is the terminal, (3) is the monitor, (4) is the speaker, (5) is the input section, (6) is the handset, (7)
is GODEC, (81 is call control unit, (9) C storage unit, Q
OI MA, (11) is a re-call processing unit. Note that the same reference numerals in the figures refer to the same or corresponding parts.

Claims (1)

[Claims] ISDN communication network connection function, call function with a telephone connected to the existing telephone network via the ISDN communication network, mode setting function such as the connection type and attributes of the other party's terminal when making a call, and the function to set the mode such as the connection type and attributes of the other party's terminal when making a call If you make a call to an existing phone in videophone mode using a videophone terminal that has the function of storing and retaining the previous subscriber number, the setting will be automatically changed to the existing phone mode and the call will be made, allowing you to make a voice call. A method for not calling an ISDN communication end, which is characterized by: