JPH0795771B2 - ISDN terminal device - Google Patents

Description

The present invention relates to ISDN (Integrated Services Digital Netwotk;
The present invention relates to an ISDN terminal device such as an ISDN telephone having a call transfer function connected to a comprehensive service digital network.

2. Description of the Related Art FIG. 6 shows a block diagram of an ISDN telephone as a conventional ISDN terminal device.

FIG. 7 shows a procedure for transferring an incoming call of the ISDN user / network interface layer 3 in the above-mentioned conventional ISDN terminal device.

FIG. 8 shows the configuration of information elements in the "additional information" message for notifying the ISDN of the call transfer source ISDN terminal device of the call transfer request and the call transfer destination number.

In FIG. 6, the line interface unit 1 (hereinafter referred to as line
The I / F section is connected to ISDN2, and the information channel (B1,
B2) and the signal channel (D) are multiplexed and input / output. The line I / F unit 1 separates and multiplexes the information channel and the signal channel. The information channels (B1 and B2) are connected to the switch unit 3 and the signal channel (D) is connected to the central processing unit 4. Has been done.

The switch unit 3 is connected to the line I / F unit 1 by a signal line for two channels B1 and B2, and is controlled by a central processing unit 4 including a microcomputer and its peripheral circuits (ROM, RAM, etc.). Switching is performed to connect the signal from either one of the channels to the codec section 5.

The codec section 5 converts the digital voice signal on the information channel into an analog signal and vice versa, and is connected to the voice circuit 6. The voice circuit 6 is connected to a handset 7 for making a call. The input / output control unit 8 is connected to an operation key input unit 9 (for example, a numeric keypad or a keyboard), a display unit 10 (for example, a liquid crystal display or a CRT display), and a ringer 11 for generating a ring tone.

The operation key input section 9 is provided with an incoming call transfer request key in addition to a numeric key for inputting a telephone number for a normal telephone function, a calling key, a disconnection key and the like.

In addition to the line I / F unit 1 and the switch unit 3, the central processing unit 4 is also connected to a voice circuit 6, an input / output control unit 8 and a storage means 12 (for example, RAM) for storing various data. It performs call control such as outgoing and incoming calls and supervisory control of the entire device.

Next, the operation of the above conventional example will be described with reference to FIGS. 6, 7, and 8. Note that in FIG. 7, the step number (STn: n = 1, 2, ...) Describes the procedure for transmitting / receiving the call control message between the ISDN terminal device A on the called side and the ISDN2.
Shown by

When there is an incoming call from ISDN2, the central processing unit 4 uses the line I / F unit 1
The "call setup" message is received from the signal channel (D) separated by (step ST1 in FIG. 7), and the input / output control unit 8
And ringing the ringer 11 at the same time as sending a "call setting acceptance" message to ISDN2 (Fig. 7, step ST
2).

When the user presses the incoming call transfer request key of the operation key input unit 9 in response to the ringing of the ringer 10, the central processing unit 4 detects via the input / output control unit 8 that there is an incoming call transfer request,
A message for inputting the call transfer destination number is displayed on display unit 10. When the user inputs an incoming call forwarding number from the operation key input unit 9, the central processing unit 4 temporarily stores the incoming call forwarding number in the storage means 12 via the input / output control unit 8.

Next, the central processing unit 4 sends an "additional information" message to the ISDN 2 via the line I / F unit 1 (step ST in FIG. 7).
3). At this time, the structure of the "additional information" message is as shown in FIG.

When sending the "additional information" message, the central processing unit 4 sets the "call transfer" service request code in the "feature activation" information element among the information elements forming the "additional information" message, The call transfer destination number stored in the storage means 12 is written in the "keypad facility" information element.

On the other hand, when ISDN2 receives the above "additional information" message, it detects that there is a "call transfer" service request from the above "feature activation" information element, and the "keypad facility" information of the above "additional information" message is detected. A "call setup" message is transmitted to the call forwarding destination ISDN terminal device C of the call forwarding number written in the element.
Thereafter, a call release process (release of only the information channels B1 and B2) is performed between the call transfer source ISDN terminal device A and ISDN2 (step ST4 in FIG. 7). The call transfer destination ISDN terminal device C that has received the “call setup” message via ISDN2
When the "call" message is transmitted to the ISDN2, the ISDN2 transmits the "display" information element as the "additional information" message to the call transfer source ISDN terminal device A (step ST5 in FIG. 7).
The central processing unit 4 uses the "display" information element to display the indicator 10
"Calling the other party" is displayed on.

Furthermore, when the response processing between the ISDN terminal device C and the ISDN2 of the call transfer destination ends normally, the ISDN2 transfers the ISD of the call transfer source.
"Display" on N terminal device A by "additional information" message
"Call transfer completed" is transmitted as an information element (step ST6 in FIG. 7). The central processing unit 4 displays "incoming call transfer completed" on the display device 10 by the "display" information element.

At the stage where the above procedure is completed, the call is transferred between the originating ISDN terminal device B and the call forwarding ISDN terminal device C. (FIG. 7, Step ST7) After ST3, the blank portions of the ISDN terminal devices A, B, and D are in the standby state.

Further, when the user sets the incoming call transfer destination before the incoming call, the procedure is as follows.

When the call transfer request key of the operation key input unit 9 is pressed, the central processing unit 4 detects the call transfer request via the input / output control unit 8 and displays an input instruction message of the call transfer destination number on the display unit 9.

When the user inputs the call forwarding number through the operation key input unit 10, the central processing unit 4 temporarily stores the call forwarding number in the storage means 12 via the input / output control unit 8.

When there is an incoming call from ISDN2, the central processing unit 4 uses the line I / F unit 1
Although the "call setup" message is received from the signal channel (D) separated by, the incoming call transfer request has already been set, so the ringer 11 is not particularly activated, and the steps from step ST2 of the incoming call transfer shown in FIG. Follow the same procedure as.

In this way, even with the ISDN telephone as the conventional ISDN terminal device described above, the call transfer can be performed even when the user sets the call transfer request at the time of the incoming call or when the call transfer destination is set in advance.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, when transferring a call in the conventional ISDN terminal device, once the call transfer destination number is registered in the ISDN terminal device that is the call transfer source, the call transfer destination should receive the call transfer call. If the user moves further, the call forwarding IS
There was a problem that the transfer destination could not be received at the moving destination unless the transfer destination was changed in the DN terminal device.

The present invention solves such a conventional problem, and provides an ISDN terminal device in which a call transfer destination number can be easily registered or updated from an ISDN terminal device to which a user is transferred, and only by a call operation. The purpose is to do.

Means for Solving the Problems In order to achieve the above object, the present invention is an ISDN terminal device having a call transfer function for transferring a call to another user without answering when there is an incoming call. When a registrant who sets a call transfer request to the terminal device registers a call transfer destination number with the call transfer destination number storage means, at the same time when the registrant registers the call transfer destination number with the call transfer destination number storage means, Registrant identifying sub-address storage means for registering a sub-address for identification, and the call transfer request from the ISDN terminal device provided at the destination after the registrant moves from the ISDN terminal device to which the call transfer request is set. "Call sub-address" information added to the "Called party number" information element included in the above "Call setup" message when the "Call setup" message is received when the call is made to the ISDN terminal device The determining means for comparing / unmatching by comparing the sub-address for registrant identification set to the original and the content stored in the sub-address storage means for registrant identification of the ISDN terminal device for which the call transfer request is set, and the moving means. Updating means for updating the contents of the call forwarding number storage means of the ISDN terminal device which has set the call forwarding request by the "calling number" information element of the destination ISDN terminal device included in the "call setting" message sent from the destination And a call transfer destination number of the ISDN terminal device for which the call transfer request is set can be changed by receiving a "call setting" message from the destination ISDN terminal device.

Operation The present invention, with the above-described configuration, can transfer the incoming call to the following destinations.

When the user sends a "call setup" message from the ISDN telephone as the destination ISDN terminal to the call forwarding ISDN terminal, the call forwarding ISDN telephone receiving this message "Incoming subaddress"
If the contents of the registrant identifying sub-address set in the information element and the contents of the registrant identifying sub-address storage means are compared and it is determined that they match, the "calling number" information element in the "call setting" message, that is, The telephone number of the destination ISDN terminal device (for example, ISDN telephone) is stored in the call transfer destination number storage means.

In this way, the destination ISDN terminal device (for example, ISDN
Just make a call from the
The call transfer destination number set in the ISDN terminal device (for example, ISDN telephone) can be updated, and even when the user moves, the call transfer destination number is changed from the destination ISDN terminal device (for example, ISDN telephone). Can be changed.

Embodiment FIG. 1 is a block diagram showing an embodiment of the present invention, showing an ISDN telephone as an ISDN terminal device.

It is to be noted that, in FIG. 1, those denoted by the same reference numerals as those in the block diagram of the conventional example of FIG. 6 have the same or equivalent functions and operations as those of the conventional example, and detailed description thereof is omitted.

FIG. 2 shows a system configuration diagram at the time of transferring a call to which the ISDN terminal device of one embodiment of the present invention is applied.

FIG. 3 shows the ISDN terminal device of one embodiment of the present invention.
An ISDN user / network interface / layer 3 call transfer procedure is shown.

FIG. 4 (a) is a flow chart showing the process of updating the call forwarding number in the ISDN terminal device of the embodiment of FIG. 1, and FIG. 4 (b) is the call reception of the ISDN terminal device of the embodiment of FIG. FIG. 5 is a flow chart showing the transfer operation, and FIG. 5 is a configuration diagram of information elements in the “call setting” message transmitted from the destination ISDN terminal device to the call transfer source ISDN terminal device in FIG.

In FIG. 1, a central processing unit 13 comprises a microcomputer and its peripheral circuits (ROM, RAM, etc.), a line I / F circuit 1, a switch section 3, an input / output control circuit 8, a storage means 12 for storing various data, In addition to the voice circuit 6 and the like, a registrant identifying sub-address storage means 14 and an incoming call transfer destination number storage means 15 are connected to perform call control such as outgoing / incoming call and incoming call transfer, and monitor control of the entire apparatus. .

In FIG. 2, the call transfer described in the conventional example is performed when the originating ISDN terminal device B makes a call to the ISDN terminal device A.
If the terminal device A makes an incoming call transfer request at the time of an incoming call, or if it is set in advance before the incoming call, the incoming call from the outgoing ISDN terminal device B can be transferred to the ISDN terminal device C of the incoming call transfer destination number via ISDN. It was that.

In the ISDN terminal device of one embodiment of the present invention, in addition to the above-mentioned call transfer function, the following call transfer function is also possible.

That is, the call transfer destination set in the ISDN terminal device A of the call transfer source can be changed only by the ISDN terminal device A of the call transfer source in the above-mentioned conventional example.
In the ISDN terminal device, the call transfer destination can be changed from any ISDN terminal device as long as the ISDN terminal device according to the embodiment of the present invention is connected to ISDN.

Next, the operation in the above embodiment will be described with reference to FIGS.
This will be described with reference to FIGS. 3, 4, and 5.

The call transfer source ISDN terminal device A and ISDN shown in FIG.
The step numbers STn (n = 1, 02, ..., 1, 2, ...) In the procedure for transmitting and receiving the call control message to and from the 2 and the processing flow of the ISDN terminal device A shown in FIG. 4 correspond to each other. ing.

In FIG. 2, the ISDN terminal device A is the originating ISDN terminal device B.
Before receiving the incoming call from the ISDN terminal device A, the incoming call transfer request is set in advance as follows so that the incoming call from the originating ISDN terminal device B is forwarded to the incoming call destination ISDN terminal device C.

In FIG. 1, when the call transfer request key of the operation key input unit 9 is pressed, the central processing unit 13 detects the call transfer request via the input / output control unit 8 and displays the call transfer destination number and call transfer to the display unit 10. Displays the input instruction message of the sub address for registrant identification corresponding to the ID number of the user to be set.

The user inputs the call forwarding number (IS
Enter the DN terminal device C's telephone number)
Reference numeral 13 temporarily sets the call forwarding number through the input / output controller 8 in the storage means 12 (for example, RAM).

Then, enter the registrant identification sub-address,
The registrant identifying sub-address is set in the registrant identifying sub-address storage means 14 (eg, RAM).

In FIG. 2, it is assumed that the user moves from the call transfer destination ISDN terminal device C to the ISDN terminal device D before calling from the originating ISDN terminal device B.

The user makes a call from the ISDN terminal device D of the moving destination to the ISDN terminal device A of the call forwarding source for which the above-mentioned call forwarding request is set.

At this time, when the user presses the incoming call transfer request key of the operation key input unit 9 in the destination ISDN terminal device D, the destination
The central processing unit 13 of the ISDN terminal device D detects the incoming call transfer request via the input / output control unit 8 and displays a "destination number" on the display unit 10, that is, in this case, the telephone number of the incoming call transfer source ISDN terminal device A and the user's telephone number. A message for inputting the sub address for registrant identification, which is an ID number, is displayed.

Subsequently, the telephone number and the registrant identifying sub-address of the incoming call transfer source ISDN terminal device A are input from the operation key input unit 9, and the call key is pressed to make a call to the incoming call transfer source ISDN terminal device A.

If only the "Called party number" is entered at this time, the call is a normal call and the call forwarding destination of the other party is not updated.

On the other hand, when viewed from the call transfer source ISDN terminal device A, as shown in the procedure of the call transfer of FIG. 3, the "call setting" message from the destination ISDN terminal device D is received (step ST01).

When an incoming call is received at the call transfer source ISDN terminal device A, the central processing unit 13 uses the signal channel (D) separated by the line I / F unit 1 to send a message from the destination ISDN terminal device D configured as shown in FIG. Receive the "call setup" message and send the "call setup acceptance" message to ISDN2 (step ST02),
Next, the destination subaddress information, that is, the registrant identifying subaddress is extracted from the "destination subaddress" information element of the "call setting" message and compared with the registration identifying subaddress already set in the registration identifying subaddress storage means 14. . If they do not match, it is not necessary to update the call transfer destination, so the contents of the storage means 12 are stored in the call transfer destination number storage means 15
After transfer to (for example, RAM), call disconnection processing is performed (step ST03).

If the "destination sub-address" information element is not set in the received "call setting" message, normal incoming processing is performed.

If they match, the "calling number" information element of the ISDN terminal device D of the moving destination, that is, the telephone number of the ISDN terminal device D of the moving destination received at the same time as the "incoming subaddress" information element is stored as the call forwarding number storage means 15 (for example, RAM etc.).

The call transfer destination number held in the storage means 12 is reset.

Subsequently, a call disconnection process is performed on the destination ISDN terminal device D (step ST03). In this way, the call transfer destination of the call transfer source ISDN terminal device A is changed from the ISDN terminal device C to the ISDN terminal device D by the call originating from the destination ISDN terminal device D.

In the above state, when there is an incoming call from the originating ISDN terminal device B (step ST1), the incoming call transfer source ISDN terminal device A is moved to the destination ISDN terminal device D held in the incoming call transfer destination number storage means 15. Call transfer to. The procedure of the call transfer is as shown in the steps (steps ST1 to ST7) of FIG.

The structure of the "additional information" message in step ST3 in FIGS. 3 and 4 is the same as that of the conventional example shown in FIG. 8, but the call forwarding destination is included in the "keypad facility" information element. The telephone number of the destination ISDN terminal device D held in the number storage means 15 is set.

The above procedure is the same as the procedure of the conventional example shown in FIG. 7 except that the ISDN terminal device C of the call transfer destination of the conventional example is changed to the ISDN terminal device D, and therefore detailed description thereof will be omitted.

In FIG. 2, if the user at the call transfer destination ISDN terminal device D further moves and makes a call to the call transfer source ISDN terminal device A from the transfer destination (not particularly shown), the call transfer source ISDN terminal device A receives the call. Transfer destination number storage means 15 is updated,
When there is an incoming call from the ISDN terminal device B, the incoming call is transferred to the updated destination ISDN terminal device.

EFFECTS OF THE INVENTION As is clear from the above embodiments, when the call transfer destination number is set when the call transfer request is set, the registrant's
By setting the registrant identification sub-address corresponding to the ID number, even if the above registrant moves from the call transfer destination, the call transfer source that first set the call transfer destination from that transfer destination
By making a call to the ISDN terminal device, the call transfer destination number can be changed at any time, so that the call transfer can always be received at the destination to which the user is moving.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a system configuration diagram at the time of call transfer to which an ISDN terminal device of an embodiment of the present invention is applied, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a diagram showing a procedure of call transfer in the example ISDN terminal device.
FIG. 4A is a flow chart showing the process of updating the call forwarding number in the ISDN terminal device of the embodiment of FIG. 1, and FIG. 4B is the call forwarding operation of the ISDN terminal device of the embodiment of FIG. FIG. 5 is a block diagram of a “call setup” message transmitted from the destination ISDN terminal device to the call transfer source ISDN terminal device in FIG. 2, and FIG. 6 is a block of the ISDN telephone of the conventional ISDN device. Figures and 7 are the same
FIG. 8 is a diagram showing the procedure of the call transfer of the ISDN user / network interface / layer 3 in the ISDN device.
It is a block diagram of the information element in the "additional information" message for notifying an incoming call transfer request and an incoming call forwarding number from the ISDN device to ISDN. 1 ... Line interface part, 2 ... ISDN, 3 ... Switch part, 5 ... Codec part, 6 ... Voice circuit, 7 ...
Handset, 8 ... I / O control section, 9 ... Operation key input section, 10 ... Display section, 11 ... Ringer, 12 ... Storage means, 13
...... Central processing unit, 14 ...... Sub address storage means for identifying registrant, 15 ...... Call forwarding number storage means.

Claims (1)

[Claims] 1. An ISDN terminal device having a call transfer function of transferring a call to another user without answering when an incoming call arrives, and a registrant who sets a call transfer request to the ISDN terminal device receives the incoming call. Call forwarding number storage means for registering the forwarding number, and registrant identification for registering a sub address for identifying the registrant at the same time when the call forwarding number is registered in the call forwarding number storage means The sub-address storage means and the "call when the registrant moves from the ISDN terminal device that has set the call transfer request and makes a call from the ISDN terminal device provided at the destination to the ISDN terminal device that has set the call transfer request. The registrant identification sub-address set in the "destination sub-address" information element added to the "destination number" information element included in the "call setup" message upon reception of the "setting" message and the above Included in the "call setting" message sent from the destination to determine the match / mismatch by comparing the content stored in the registrant identifying sub-address storage means of the ISDN terminal device that has set the call transfer request The ISDN terminal device of the moving destination is provided with an updating means for updating the contents of the incoming call forwarding number storage means of the ISDN terminal device for which the above-mentioned incoming call forwarding request is set, and the ISDN terminal device of the moving destination performs "call setting". The ISDN terminal device characterized in that the call transfer destination number of the ISDN terminal device for which the call transfer request is set can be changed by receiving the message.