JPH02153662A - Isdn telephone terminal - Google Patents

Abstract

PURPOSE:To enable communication to be performed even when an operator is absent by issuing a transfer destination to an outgoing terminal when detecting incoming, transmitting information received from the outgoing terminal to the transfer destination when the transfer destination responds to the incoming, and transferring received information from the transfer destination to the outgoing terminal. CONSTITUTION:A RAM(random access memory) 3 stores a various kind of information proper to an ISDN(Integrated Services Digital Network) telephone set, for example, the telephone number of the transfer destination, etc. Also, the transfer destination setting key 4d of an operation display part 4 sets and inputs a transfer mode which transfers the incoming to another ISDN telephone set when the ISDN telephone set detects the incoming. When the incoming is detected, the transfer destination is issued to the outgoing terminal responding to a call signal, and when the transfer destination responds to the incoming, an incoming response is issued to the outgoing terminal, and the information received from the outgoing terminal is transmitted to the transfer destination, and also, the information received from the transfer destination is transferred to the outgoing terminal. In such a way, it is possible to perform speech targeted by the operator of the outgoing terminal even when the operator is absent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ISDN telephone terminal that uses ISDN as a transmission path.

L. Prior Art] In recent years, ISDN (Integrated Service Digital Communication Network) is being developed, and data terminal devices that exchange data using this ISDN are gradually coming into use.

ISDN is intended to replace the conventional PSTN (Public Telephone Network) in the future, and ISDN telephone terminals that perform the same functions as conventional telephone terminals are also coming into use.

[Problems to be Solved by the Invention] Incidentally, an ISDN subscriber line is multiplexed with a signal channel for exchanging various signals with the network during call setup procedures, and two information channels. Such ISDN telephone terminals are required to have a function of effectively utilizing such multiplexed information channels.

The present invention has been made in view of the above-mentioned circumstances, and when the operator of the ISDN telephone terminal is absent,
It is an object of the present invention to provide an ISDN telephone terminal that realizes a transfer function that can transfer a call that is detected as being incoming at that time to another ISDN telephone terminal.

[Means for Solving the Problems] The present invention includes a forwarding destination input means for inputting a forwarding destination by operation, and a forwarding destination storage means for storing the forwarding destination inputted from the forwarding destination input means, and when an incoming call is detected. A call is made to the forwarding destination while the calling terminal responds with a paging signal, and when the forwarding destination responds to the incoming call, the calling terminal responds to the incoming call, and the information received from the calling terminal is sent to the forwarding destination, as well as the information received from the forwarding destination. is transferred to the originating terminal.

[Operation] Therefore, since the originating terminal can be connected to a transfer destination specified in advance, even if the operator is absent, the operator of the one originating terminal can make the intended call.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an ISDN telephone according to one embodiment of the present invention.

In the figure, the CPU (central processing unit) l is
It executes control processing for the entire DN telephone set and line control processing for the ISDN basic interface function.
M (read-only memory) 2 stores the control processing program executed by this CPU and various data necessary for the control processing program.
(Random access memory) 3 is for storing various information specific to this ISDN telephone, such as the telephone number of the transfer destination.

The operation display section 4 is for operating this ISDN telephone, and is made up of various operation keys and a display.The tone generation circuit 5 generates a ring tone for calling the operator when a nurse is detected, The speaker 6 is for generating various tone signals such as a beep sound to call attention, and the speaker 6 is for outputting various tone signals generated from the tone generating circuit 5.

The ISDN interface circuit 7 is for connecting this ISDN telephone to the ISDN network terminal (NT), and the LAPD control unit 8 realizes layer 2 signal processing of the ISDN basic interface function. The audio signal converter (CODEC) 9 is for converting analog audio signals for telephone calls into digital signals that can be handled by ISDN and transmitting the converted signals. It is for making phone calls. Further, the hook signal of the handset 10 is output to the CPUI.

In addition, the CPUI, ROM2, RAM3, operation display section 4,
Tone generation circuit 5, ISDN interface circuit 7, L
The APD control section 8 and the audio signal conversion section 9 are connected to a system bus 11, and various information is exchanged between these elements via the system bus 11.

FIG. 2 shows an example of the operation display section 4 of this ISDN telephone.

In the same figure, the numeric keypad 4a is used to input numerical information such as the destination telephone number and sub-address number, and the set key 4b is used to specify the timing for confirming the input information on the numeric keypad 4a and importing it into the ISDN telephone. The clear key 4c is used to erase input information entered from the numeric keypad, and the transfer destination setting key 4d is used to transfer the incoming call to another ISDN phone when this ISDN phone detects an incoming call. The transfer cancellation key 4e is used to set and input the transfer mode to be used.

The transfer reset key 4f is used to input the transfer cancellation function to cancel the transfer mode set on another ISDN phone, and the transfer reset key 4f is used to set (reset) the transfer mode on another ISDN phone. This is for inputting the resetting function.

The lamp 4g indicates that this ISDN telephone is set to transfer mode, and the liquid crystal display 114
h is for displaying and outputting various guidance information from this ISDN telephone to the operator, numerical information operated and inputted from the numeric keypad 4a, and the like. In this embodiment, the set key 4b and clear key 40 are used as keys for responding to guidance messages.

Furthermore, a monitor speaker 6 is built in under the transfer reset key 4f, and a handset 10 is installed on the left side of the housing.
A space has been secured to accommodate.

Note that the device is on-hook when the handset 10 is accommodated, and off-hook when the handset 10 is picked up.The hook state is detected by a hook switch (not shown) and notified to the CPUI as a hook signal.

Here, the basic transmission procedure performed by the ISDN telephone during a call will be explained.

As shown in FIG. 3, the originating terminal first sends a call setup message 5ETUP to the ISDN to request call setup with the destination terminal, and the ISDN sends a call setup message 5ETUP to the specified destination terminal. Make a call.

Upon receiving the call setup message 5ETUP, the ISDN:
Call setup acceptance message CA to notify call setup status
Sends LL-PROC to the originating terminal.

When the destination terminal detects an incoming call, it starts ringing to call the operator of its own terminal and sends a paging message ALERT to ISDN, which then sends a paging message ALERT to the originating terminal and starts calling the destination terminal. notify you of what has happened. In addition, the calling message ALER
T is repeatedly output at an appropriate period.

When the operator who hears the ring tone picks up the handset 10 and detects that it has gone off-hook, the called terminal stops outputting the calling message ALERT and sends a response message C0NN to the ISDN, and the ISDN sends the response message C0NN to the originating terminal. to notify that the called terminal has accepted the call.

In addition, ISDN sends a response confirmation message C0N to the destination terminal.
NJCK is sent and the response of the destination terminal is confirmed, at which point an information channel for data transmission is established between the originating terminal and the destination terminal.

As a result, the calling terminal and the receiving terminal are in a state where they can talk to each other, and the calls are made between the respective operators.

Then, when the call ends and the operator on the originating terminal goes on-hook first, the originating terminal sends a disconnection message DISC to the ISDN to request release of the information channel, and the ISDN
The DN sends a disconnection message DISC to the destination terminal to notify that the information channel has been restored.

As a result, when the destination terminal responds to ISDN with a release message REL notifying that the channel has been disconnected, the ISDN sends a release message REL to the originating terminal.0 When the channel release is completed, the originating terminal sends a release message REL to the ISDN.
L-COMP is sent to the ISDN to notify the ISDN, and the ISDN then sends a release completion message REJCOM.
P is sent to the destination terminal, the information channel is released,
The information channel that was set up between the originating terminal and the terminating terminal is completely released.

In this way, an information channel is set up between the originating terminal and the terminating terminal, a call is made between the operators, and the information channel is released.

Furthermore, after the end of the call, the operator of the first destination terminal can go off-hook first and release the information channel. In this case, the first destination terminal sends a disconnection message orsc to request release of the information channel.

Next, a call setup message 5ETUP and a release completion message R are required to realize the transfer function of this embodiment.
The contents of Et and GOMP will be explained.

First, each message includes a protocol identifier for identifying the protocol specification S (format, sequence, etc.) that defines the layer 3 call control message, as shown in FIG. a message type to identify the content of each message, a mandatory information element that is always added to each message, and an optional information element that is added to each message. It consists of additional information elements. Note that the required information elements are 0, 1, etc. depending on the message type. Alternatively, a plurality of additional information elements are set, and 0.1 or a plurality of additional information elements are arranged depending on the situation.

As shown in FIG. 5(b), the call setup message 5ETUP has "transmission capability" as an essential information element, and "terminal function", "calling number", and "layer number" as additional information elements.

It also has information elements such as "user/user".

The release completion messages REI and COMP have a "reason display" as an essential information element, as shown in FIG.

It has "display" and "user/user" as additional information elements.

Here, an outline of each information element will be explained.

The "transmission capability" information element indicates whether the content of the information to be transmitted is voice, unrestricted digital information, restricted digital information, or 3.1KH.
z audio, 7 Hz audio or video, the transfer mode indicating whether the switching function used is circuit switching or packet switching, and the speed of information transfer. It consists of information indicating the information transfer rate, information transfer format, and information indicating the user information protocol.

The "terminal capabilities" information element is used to indicate to the network the capabilities of a stem mode terminal.

The "calling number" information element contains the ISDN address (telephone number) of the calling terminal, and the "r-layer number" information element contains the ISDN address (telephone number) of the calling terminal.

Get the ISDN address of the destination terminal.

The "reason display" information element is used to describe the reason for the generation of a certain message, to provide diagnostic information in the case of a procedural error, and to indicate the source of the reason.

The "display" information element is used to display various display information transmitted from the network to the terminal, such as usage charges, on the terminal.

The "user-to-user" information element is used to transmit information between users, and the contents of this information element are transparently transmitted to the other party's terminal without being interpreted by the network.

With the above configuration, the operation will be described when, for example, the operator is absent and uses the transfer function to receive incoming calls on his or her own telephone at the destination telephone. It is assumed that each telephone terminal in the following description has the same configuration as the ISDN telephone shown in FIG.

At this time, the operator first turns on the transfer destination input key 4d on the operation display section 4.

As a result, the CPUI of the ISDN telephone, for example,
Wait for the operator to input the destination phone number from the numeric keypad 4a and turn on the set key 4b. .

When the operator completes this operation, the telephone number entered at that time is stored as the forwarding destination telephone number, the forwarding mode is set, and the hail lamp 4g indicates that the forwarding mode is set. will be lit and displayed.

In this state, a case will be described in which a call is made from another ISDN telephone to an ISDN telephone set in this transfer mode (hereinafter referred to as a transfer terminal).

In this case, as shown in FIG.
When the call is sent to the DN, a call setup message 5ETUP is sent from the ISDN to this transfer terminal.

The transfer terminal is called.

The transfer terminal stores the calling number of the call setting message 5ETUP and starts responding to the paging message ALERT. At this time, since the transfer mode is set, the transfer destination telephone number stored at that time is used as the layer number. Then, a call setting message 5ETUP in which the telephone number of the own terminal is set as the calling number is sent to the ISDN to place a call to the transfer destination terminal.

In addition, the call setting procedure between the originating terminal and the transfer terminal, and
The call setup procedure between the transfer terminal and the transfer destination terminal is performed independently.

As a result, a call setup message 5ETUP is sent from the ISDN to the transfer destination terminal, and the transfer destination terminal makes a call.

When the transfer destination terminal receives the call setup message 5ETUP, it starts generating a ring tone to call the operator and sends a call message ALERT to the ISDN.
Start sending.

When the operator who hears the ring tone picks up the handset IO and detects off-hook, the transfer destination terminal sends a response message C0NN to the transfer terminal.

When the transfer terminal receives the response message C0NN in the call setup procedure on the transfer destination terminal side, it sends the response message C0NN in the call setup procedure on the calling terminal side to the ISDN.

ISDN establishes information channels between the originating terminal and the transfer terminal, and between the transfer terminal and the transfer destination terminal, and notifies the establishment of each information channel by a response confirmation message C0NNjC.

As a result, information channels are established between the originating terminal and the transfer terminal, and between the transfer terminal and the transfer destination terminal.

From now on, when the transfer terminal is assigned the information channel Bl with the originating terminal and the information channel B2 with the transfer destination terminal, the transfer terminal receives the received signal via the information channel 81. The signal is sent as a transmission signal to the information channel B2, and the received signal received via the information channel B2 is sent as a transmission signal to the information channel B1.

That is, the voice signal from the operator of the originating terminal is transmitted to the destination terminal via the transfer terminal.

A voice signal from the operator of the transfer destination terminal is transmitted to the originating terminal via the transfer terminal, and as a result, a conversation between the operator of the origination terminal and the operator of the transfer destination terminal becomes possible.

When the call ends and the operator of the originating terminal and the operator of the transfer destination terminal return the handset 10 at any timing, the originating terminal and the transfer destination terminal each send a disconnect message DISC at the on-hook timing.
is sent to ISDN.

As a result, when the transfer terminal receives the disconnection message DISC during the call setup procedure on the calling terminal side, it starts the call recovery procedure with the originating terminal, and independently from this, the transfer terminal performs the call setup procedure on the transfer destination terminal side. When the terminal receives the disconnection message DISC, it starts a call restoration procedure with the transfer destination terminal and restores the respective call connections.

In this way, when the transfer terminal receives a call from the originating terminal, it calls the transfer destination terminal while holding the call, and when the transfer destination terminal answers the call, at that point, the transfer terminal Answer incoming calls.

As a result, when the ISDN establishes an information channel between the originating terminal and the transfer terminal, and between the transfer terminal and the transfer destination terminal, the transfer terminal interfaces between the origination terminal and the transfer destination terminal. .

To enable a call between an operator of a calling terminal and an operator of a transfer destination terminal.

Furthermore, when the transfer terminal receives the disconnect message DISC during the call setup procedure on the calling terminal side, it proceeds to the procedure for releasing the call connection with the originating terminal, and also receives the disconnect message DISC during the call setup procedure on the transfer destination terminal side. When received, the process proceeds to a procedure for releasing the call connection with the transfer destination terminal, and each call is released independently.

By the way, if the transfer destination terminal is in a busy state, as shown in FIG. 6, the transfer destination terminal that receives the call setup message 5ETUP ignores the call and sends a predetermined response message. I haven't done it.

At this time, ISDN sends a paging message AL to the transfer terminal.
E! RT is sent, but the response message C0NN is not received from the transfer destination terminal even after a certain period of time has elapsed, so at that point, the transfer terminal sends a release message REL containing the "reason display" information element indicating that the destination terminal has not responded. Send to. When the transfer terminal receives this release message REL, it responds with a release completion message REL,COMP,
The call setup procedure on the transfer destination terminal side ends.

On the other hand, when the transfer terminal receives the release message REL in the call setup procedure on the transfer destination terminal side, it sends a disconnection message DISC in the call setup procedure on the calling terminal side, executes the call release procedure with the originating terminal, and then makes the first call. Release the call connection with the terminal.

In this way, if the transfer operation fails, the transfer terminal will
After a certain period of time, a call setup message 5ETU is sent.
Send P to the destination terminal. At this time, a call setting message Sll! The TOP “User/User” information element has the following information:
Information indicating that an incoming call has been detected and the telephone number of the calling terminal at that time are set.

The transfer destination terminal analyzes the call setup message 5ETUP received from the ISDN, and if the "user-user" information element contains information indicating that an incoming call has been detected, it releases the call connection at that point. Then, a release completion message REL-COMP is sent to the ISDN.

Also, as the content of the "user-user" information element of the release completion message REI, COMP, the call setup message Sll! Set response information to indicate that the content of the TOP has been understood.

As a result, a release completion message REL-COMP is sent from the ISDN to the transfer terminal, and the call is terminated.

In addition, the f& sending terminal sends a release completion message REL-CO.
The content of the key "user-user" information element is inspected to confirm that the transfer destination terminal has returned appropriate response information.

On the other hand, the transfer destination terminal sends a release completion message REL-CO.
When the MP transmission is finished, a beep sound generated by the tone generation circuit 5 is output from the speaker 6 to alert the operator, and a message such as [[
The calling number received a call from [calling terminal phone number].

” is displayed to notify the operator that the transfer terminal has received a call from the originating terminal. here,[
The contents of [calling number] will display the contents of the "calling number" information element of the call setting message 5ETUP at that time, and the contents of [calling terminal telephone number] will display the contents of the "user-to-user" information element. Displays the contents of the calling terminal's phone number that was previously displayed.

In this way, if the transfer destination terminal is busy when the transfer process is executed, when the transfer destination terminal becomes available to answer an incoming call, it is possible to confirm that a call has been made from the originating terminal to the transfer terminal. is notified to the transfer destination terminal, displayed on the transfer destination terminal, and notified to the operator.

Therefore, since the operator of the transfer destination terminal can call the originating terminal, it becomes possible to talk to the operator of the originating terminal.

In addition, the transfer terminal sends a call release message REL-C whose "user user" information element includes predetermined response information.
Until the OMP is received from the transfer destination terminal, the call setting message 5ETUP with the same content is repeatedly sent at fixed time intervals to re-call the transfer destination.

Such processing is also performed when the transfer terminal is using one information channel when the calling terminal makes a call.

In this case, when the call setup message 5ETUP is received, the call connection is released in response to the release completion message REI, COMP, and after an appropriate time has elapsed,
A call setting message 5ETUP in which information indicating that an incoming call has been detected and the telephone number of the calling terminal at that time is set in the "user-user" information element is sent to the ISDN, and the transfer destination terminal is called.

By the way, the transfer mode of the transfer terminal can be canceled and the transfer destination can be reset as follows.

That is, when the operator cancels the transfer mode of his own ISDN telephone, he only has to turn on the transfer destination input key 4d again.

Thereby, the CPU 1 cancels the transfer mode and erases the transfer destination telephone number.

Further, when canceling the transfer mode of the transfer terminal from another ISDN telephone, the transfer cancellation key 4e is turned on.

As a result, the ISDN telephone can display, for example, ``Enter the phone number of the phone you want to cancel the transfer mode 1, set key 4b.''
"Please turn on" guidance appears on LCD display 4.
When the operator operates the numeric keypad 4a to input the telephone number of the transfer terminal to be released from the transfer mode, and turns on the set key 4b, the ISDN telephone starts a call operation.

That is, as shown in FIG. 7, the telephone number of the own terminal is entered in the "calling number" information element, the telephone number of the transfer terminal is entered in the "r called party number" information element, and the transfer mode cancellation is entered in the "user-user" information element. A call setup message SETυP with each set of hail information is sent to the ISDN.

As a result, a call setup message 5ETUP with the same content as that sent by the calling terminal is sent from the ISDN to the transfer terminal.

The transfer terminal analyzes the contents of the call setup message 5ETUP, and if the "user-to-user" information element contains information to cancel the transfer mode.

To release the call connection, a release completion message RE is sent.
It responds with L-COMP.

Also, a release completion message RE! is sent in response at this time. L
- As the contents of the "user-to-user" information element of COMP, response information indicating that the contents of the call setting message 5ETUP have been understood is set.

The originating terminal receives a release completion message REL-C from ISDN.
When the OMP is received, the call connection is released at that point.

On the other hand, the transfer terminal cancels the internally set transfer mode, turns off the lamp 4g, and further erases the transfer destination telephone number.

In this way, the transfer mode set in the transfer terminal can be canceled by operation from another ISDN telephone.

Similarly, the transfer destination telephone number set in the transfer terminal can be reset from another ISDN telephone.

In this case, turn on the transfer reset key 4f of the ISDN telephone.

This causes the LCD display 4h to display, for example, ``Enter the phone number of the phone for which you want to reset the forwarding destination,'' and press the set key 4b.
"Please turn on" guidance is displayed.

In response to this guidance display, when the operator operates the numeric keys to enter the telephone number of the forwarding destination to be reset to forwarding, and turns on the set key 4b, the ISDN telephone will
Next, for example, guidance such as "Please enter the new transfer destination telephone number and turn on the set key 4b" is displayed on the liquid crystal display 4h.

When the operator operates the numeric keys to input the telephone number of the telephone to be newly designated as the transfer destination and turns on the set key 4b, the ISDN telephone starts the call operation.

That is, similar to FIG. 7, the telephone number of the own terminal is set in the "calling number" information element, the telephone number of the transfer terminal is set in the "layer number" information element, and the transfer mode is reset in the "user-user" information element. Call setup message 5 ETUP with hail information and the phone number of the phone set as the new forwarding destination.
is sent to ISDN.

As a result, a call setup message 5ETUP with the same content as that sent by the calling terminal is sent from the ISDN to the transfer terminal.

The transfer terminal analyzes the contents of the call setup message 5ETUP, and if the "user-user" information element contains information requesting resetting the transfer mode and the telephone number of the phone set as the new transfer destination. , it responds with a release completion message REL-COMP to release the call connection.

As a result, the call connection between the originating terminal and the transfer terminal is released, as described above.

Further, the transfer terminal changes the content that has been set as the transfer destination phone number to the phone number notified at that time.

In this way, the transfer destination telephone number set in the transfer terminal can be changed by operation from another ISDN telephone.

Therefore, for example, when the operator moves from the first destination to the next destination, the incoming call of the transfer terminal can be transferred to the telephone of the next destination, which is very convenient.

By the way, in the embodiment described above, the ISDN telephone is
Although the case of connection to a DN has been described, the present invention can be similarly applied to a case of connection to a private branch exchange equipped with an ISDN function.

[Effects of the Invention] As explained above, according to the present invention, a transfer destination can be registered, and when an incoming call is detected, a call is made to the transfer destination while the calling terminal responds with a paging signal, and the transfer destination is When a call is answered, the calling terminal responds to the call and sends the information received from the calling terminal to the forwarding destination, and also transfers the information received from the forwarding destination to the calling terminal, so the calling terminal is sent to the forwarding destination specified in advance. so you can connect
To obtain the effect that even when the operator is absent, it becomes possible to carry out a telephone conversation intended by the operator of the originating terminal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an ISDN telephone according to an embodiment of the present invention, FIG. 2 is a schematic diagram showing an example of an operation display section, and FIG. 3 is a time chart showing an example of a basic procedure of the ISDN telephone. FIG. 4(a) is a schematic diagram illustrating the signal format of a message for a call setup procedure, FIG. 4(b) is a schematic diagram illustrating an example of information elements of a call setup message, and FIG. Schematic diagram showing an example of information elements of 5th
The figure is a time chart showing an example of the procedure at the time of transfer, Figure 6 is a time chart showing an example of the procedure when transfer is not possible, and Figure 7 is a time chart showing an example of the procedure when remotely controlling the functions of the transfer terminal. be. 1...CPU (central processing unit), 2...ROM
(read-only memory), 3...RAM (random access memory), 4...operation display section, 4d
...Transfer destination input oyster-14e...Transfer Fig. 2 Fig. 3 Fig. 5 Arm 1 Fuhe SDN Fig. 6 Soft casing Fig. 4 (a) (b) (C)

Claims (2)

[Claims] (1) In an ISDN telephone terminal that uses ISDN as a transmission path, there is a forwarding destination input means for inputting a forwarding destination, a forwarding destination storage means for storing the forwarding destination input from the forwarding destination input means, and when an incoming call is detected. A call is made to the transfer destination while the originating terminal responds with a paging signal, and when the transfer destination responds to the incoming call, the originating terminal responds to the incoming call, and the information received via the first information channel set up between the originating terminal and the originating terminal. control to send the information to the transfer destination via a second information channel set between the transfer destination and the information received via the second information channel to the originating terminal via the first information channel. An ISDN telephone terminal characterized by comprising means. (2) If the transfer destination does not respond to an incoming call when the transfer destination is called, the control means interrupts transmission with the calling terminal at that point, and calls the transfer destination again at an appropriate time thereafter. , the ISDN according to claim 1, wherein the ISDN notifies the forwarding destination that there is an incoming call and the identification information of the calling terminal.
telephone terminal.