JP2534007B2 - Incoming call control device and incoming call control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, an integrated service digital network (Inrtegrade Services Digital Network).
k, hereinafter referred to as ISDN. The present invention relates to an incoming call control device and an incoming call control method in a communication system.

[0002]

2. Description of the Related Art The point-to-multipoint (point to multipoint) currently provided in ISDN.
t) If the interface type by connection is 2B + D basic interface, two B channels (B
It is a function of the network side to perform a sequential search for each of two terminal devices that are non-fixedly connected to 1ch and B2ch) or each of a plurality of terminal devices that are connected to one D channel. It has not been.

That is, in the sequential search function of the current ISDN, a sequential search is performed with each physical one line as a search target among a plurality of physical lines that are a set of one physical line sharing a plurality of channels (2B + D). ing. Therefore, each of the two terminal devices that are non-fixedly connected to the two B channels (B1ch and B2ch) shared by one physical line or each of the plurality of terminal devices that are connected to the D channel are sequentially connected. It cannot be distinguished as the search target of the search.

FIG. 1 shows the configuration of a user system for one line connected to the ISDN.

Two B channels (B1ch and B2ch)
And two B channels (B1ch and B2ch) of one physical line (multiplexed line) L1 including one D channel
, The terminal adapters TA1 and TA2 that provide the same switching service (either the circuit switching service or the packet switching service) to the digital circuit terminating device (Didital Service Unit) DSU.
Is connected to the bus via the bus. Terminal adapter T
Terminal equipment DT1 is connected to A1, and terminal equipment DT2 is connected to the terminal adapter TA2.

FIG. 3 shows a conventional incoming sequence when a calling request is made to the multiplexed line L1 from a calling side terminal device connected to another line (not shown).

When a call request is made to the line L1 from the calling terminal device and the ISDN receives a call setup message based on this call request, the ISDN sends a call setup message (SETUP, UI) to the line L1. (Step (101)).

When each of the terminal adapters TA1 and TA2 receives the call setting message (SETUP, UI), it is connected to the terminal devices DT1 and DT2 connected thereto so as to notify that the call setting is occurring. The incoming call signal (call display (Call
ing Indication), ringing, etc.) (steps (102), (103)).

Further, the terminal adapters TA1 and TA2 are
After transmitting an incoming call signal to the terminal devices DT1 and DT2 connected thereto, a call message (ALERT, I frame, TE) for notifying that the called party is calling.
1), (ALERT, I frame, TE2) ISDN
(Steps (104) and (105)). This calling message (ALERT, I frame, TE1),
(ALERT, I frame, TE2) is transmitted from the ISDN to the calling terminal device.

Upon receiving the incoming call signal, each of the terminal devices DT1 and DT2 individually executes an incoming call process, and causes the terminal adapters TA1 and TA2 connected thereto to perform a call connection operation. An incoming call acceptance signal indicating that the call is accepted (steps (106), (10)
7)).

Upon receiving the incoming call acceptance signal from the terminal devices DT1 and DT2 connected thereto, each of the terminal adapters TA1 and TA2 responds to the ISDN with a response message (CONN, I frame, TE1), (CONN, I frame, TE2)
Send to SDN (step (108), (10
9)). These response messages (CONN, I frame, TE1), (CONN, I frame, TE2) are
Sent from the ISDN to the calling terminal.

ISDN is both terminal adapters TA1, TA
Of the two response messages (CONN, I frame TE1) and (CONN, I frame TE2) from 2 above, the one confirmed by ISDN is the response confirmation message (CONN ACK) to the corresponding terminal adapter TA1, TA2. Send (step (110)), IS
If the DN confirms later, a release message (REL) is transmitted to the corresponding terminal adapter TA1, TA2 (step (111)).

In this example, two response messages (CO
It is assumed that the response message (CONN, I frame TE1) from the terminal adapter TA1 among the NN, I frame TE1) and (CONN, I frame TE2) has been previously confirmed by ISDN. Therefore, in this example, the terminal adapter T previously confirmed by ISDN
Response confirmation message from A1 (CON ACK, I
Frame TE1) is from ISDN to terminal adapter TA1
(Step (110)). Also, ISDN
The release message (REL, I frame, TE2) is transmitted from the ISDN to the terminal adapter TA2 in response to the response message (CONN, I frame TE2) from the terminal adapter TA2 confirmed by the later (step (111)). .

Upon receiving the release message (REL, I frame, TE2), the terminal adapter TA2 cancels the call connection and releases the release completion message (REL COMP, I).
The frame, TE2) is transmitted to the ISDN, and the process ends (step (112)).

The terminal adapter TA1 receives the response message (CONN ACK, I frame, TE) from the ISDN.
When 1) is received, the call connection operation for the terminal device DT1 is performed (step (113)). As a result, the B channel (B1ch or B2ch) is connected, and communication on this channel is started (step (114)).

In the step (112), the terminal adapter T
A2 sends a release completion message (REL COM
(P, I frame, TE2) is transmitted to the ISDN and the processing is terminated, the terminal device DT2 continues the above step (107).
Since the incoming call reception has already been transferred to the incoming call processing, the terminal device DT2 performs internal processing such as processing this incoming call as a bad incoming call, and then confirms disconnection indicating that the call is released for the bad incoming call. The signal is transmitted to the terminal adapter TA2 (step (115)).

[0017]

In the above-mentioned conventional communication method, the release completion message (R
Even if (EL COMP, I frame, TE2) is transmitted from the terminal adapter TA2 to the ISDN, the terminal device DT2 has already shifted from the incoming call reception in step (107) to the incoming call process, so the terminal device DT2 receives this incoming call. It is necessary to perform internal processing such as processing the call as a bad incoming call. Therefore, from the step (107) to the step (11)
During the fixed time T up to 5), the terminal adapter TA2 and the terminal device DT2 are unnecessarily occupied. Therefore, during that time, the call connection operation is not performed for the next call setting, which adversely affects the line traffic. The time in which the terminal adapter TA2 and the terminal device DT2 are unnecessarily occupied varies depending on the processing method of the terminal device DT2, but in the case of the existing device, it is in the range of several seconds to several minutes.

The present invention provides an incoming call control device and an incoming call control method capable of sequentially performing a search for each terminal device as a search target when a plurality of terminal devices are connected to one multiplexing line of a data communication switching network. The purpose is to provide.

[0019]

An incoming call control device according to the present invention is an incoming call control device for a terminal device when a plurality of terminal devices are connected to one multiplexing line of a data communication switching network. When receiving a call setting message from the data communication switching network, the terminal device-specific response message indicating that each terminal device has responded is notified without notifying that there is an incoming call to each of the terminal devices. A means for transmitting to the data communication switching network, and a response confirmation message from the data communication switching network for the response message which is first confirmed by the data communication switching network among the response messages for each terminal device is received. And a means for notifying that there is an incoming call in order to make the terminal device corresponding to the received response confirmation message receive the incoming call, and the terminal device When a release message is received from the data communication switching network for the response message confirmed by the data communication switching network from the second among the response messages, the terminal device corresponding to the received release message is received. It is characterized by comprising means for transmitting a release completion message to the data communication switching network.

The incoming call control device is, for example, an ISDN.
Incoming control of two terminal devices connected to each B channel of one multiplexed line sharing two B channels and one D channel in ISDN, two B in ISDN
The present invention is applied to incoming control of a plurality of terminal devices connected to the D channel of one multiplexed line sharing one channel and one D channel. The incoming call control device is composed of, for example, a plurality of terminal adapters connected to the respective terminal devices.

An incoming call control method according to the present invention is an incoming call control method for a terminal device when a plurality of terminal devices are connected to one multiplexing line of a data communication switching network, wherein When receiving a call setup message from the network, a response message for each terminal device indicating that each terminal device has responded to the data communication switching network without notifying that there is an incoming call to each terminal device. The response confirmation received when the response confirmation message from the data communication switching network is received in response to the response message that the data communication switching network has confirmed first in the response message for each terminal device. Notify that there is an incoming call so that the terminal device corresponding to the message can receive the incoming call. When the switching network receives a release message from the switching network for data communication in response to the second and subsequent acknowledged messages, a release completion message for the terminal device corresponding to the received release message is sent for the data communication. It is characterized by transmitting to the switching network.

The above incoming control method is, for example, ISDN.
Incoming control of two terminal devices connected to each B channel of one multiplexed line sharing two B channels and one D channel in ISDN, two B in ISDN
The present invention is applied to incoming control of a plurality of terminal devices connected to the D channel of one multiplexed line sharing one channel and one D channel. The incoming call control is performed by, for example, a plurality of terminal adapters respectively connected to the terminal devices.

[0023]

The operation of controlling the incoming call to the terminal equipment when a plurality of terminal equipments are connected to one multiplexing line of the data communication switching network is as follows.

That is, when the call setup message from the data communication switching network is received, a response message for each terminal device indicating that each terminal device has responded without notifying each terminal device of the incoming call. Is transmitted to the data communication switching network. That is, the response message for each terminal device is transmitted to the data communication switching network without performing the incoming call processing by each terminal device.

When a response confirmation message from the data communication switching network for the response message which the data communication switching network has confirmed first in the response messages for each terminal device is received, the received response confirmation message is The corresponding terminal device is notified that there is an incoming call in order to make the incoming call. Thereby, the incoming call process is performed by the terminal device corresponding to the received response confirmation message.

When a release message is received from the data communication switching network in response to the second or later response message confirmed by the data communication switching network in the response message for each terminal device, the received release message is received. The release completion message for the terminal device corresponding to is transmitted to the data communication switching network. Therefore, the terminal equipment corresponding to the received release message can wait for the next call from this point.

[0027]

Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 shows the configuration of a user system for one line connected to the ISDN.

Two B channels (B1ch and B2ch)
And two B channels (B1ch and B2) of one physical line (multiplexed line) L1 sharing one D channel.
ch), each of which provides the same switching service (either circuit switching service or packet switching service) TA1 and TA2
Is a digital circuit terminating device (Didital Service Unit) D
It is connected to the SU via a bus. The terminal adapter TA1 includes terminal equipment DT1.
However, the terminal device DT2 is connected to the terminal adapter TA2.

FIG. 2 shows an incoming call sequence when a calling request is made to the multiplexed line L1 from a calling side terminal device connected to another line (not shown).

When there is a call request from the calling terminal device to the line L1 and the ISDN receives a call setup message based on this call request, the ISDN sends a call setup message (SETUP, UI) to the line L1. Send (step (1)).

When each of the terminal adapters TA1 and TA2 receives the call setting message (SETUP, UI), if the terminal device DT1 or DT2 connected thereto can receive the call, an incoming call signal (call display (calling Calling In
A call message (ALERT) for notifying that the called party is ringing is transmitted to the ISDN without transmitting (indication), ringing, etc.) (steps (2) and (3)). Whether or not each of the terminal devices DT1 and DT2 can receive an incoming call can be confirmed by, for example, each of the terminal devices DT.
1. ER signal (Equipment Ready) and DTR signal (Data Ter) transmitted from DT1 to DT2 to each terminal adapter TA1 and TA2.
minal Ready) and other terminal ready signals.

In this example, each terminal adapter TA1, TA
It is assumed that both 2 can receive an incoming call. Therefore, in this example, when each of the terminal adapters TA1 and TA2 receives the call setting message (SETUP, UI), it does not send an incoming call signal to the terminal devices DT1 and DT2 connected thereto, and the calling message (ALERT, I-frame, TE
1), (ALERT, I frame, TE2) ISDN
(Steps (2) and (3)). This call message (ALERT, I frame, TE1), (ALE
RT, I frame, TE2) is transmitted from the ISDN to the terminal device on the calling side.

Each of the terminal adapters TA1 and TA2 has a calling message (ALERT, I frame, TE1), (AL
Following the transmission of the ERT, I frame, TE2) to the ISDN, a response message (CONN, I frame, TE
1) and (CONN, I frame, TE2) are transmitted to ISDN (steps (4) and (5)). These response messages (CONN, I frame, TE1), (CON
N, I frame, TE2) is transmitted from the ISDN to the calling terminal.

That is, in this embodiment, each of the terminal adapters TA1 and TA2 has a call setup message (SETUP, U).
When I) is received, each terminal device DT1 capable of receiving an incoming call,
Send a call message (ALERT) and a response message (CONN) to ISDN without notifying DT2 that call setup is occurring. Therefore, at this time point, the incoming call processing is not performed in each of the terminal devices DT1 and DT2.

ISDN is both terminal adapters TA1, TA
Of the two response messages (CONN, I frame TE1) and (CONN, I frame TE2) from 2 above, the one confirmed by ISDN is the response confirmation message (CONN ACK) to the corresponding terminal adapter TA1, TA2. Send (step (6)), ISDN
The release message (RE
L) is transmitted to the corresponding terminal adapters TA1 and TA2 (step (7)).

In this example, two response messages (CO
It is assumed that the response message (CONN, I frame TE1) from the terminal adapter TA1 among the NN, I frame TE1) and (CONN, I frame TE2) has been previously confirmed by ISDN. Therefore, in this example, the terminal adapter T previously confirmed by ISDN
Response message from A1 (CONN, I frame T
E1) response confirmation message (CONN AC
The K, I frame TE1) is transmitted from the ISDN to the terminal adapter TA1 (step (6)). Also, ISD
In response to the response message (CONN, I frame TE2) from the terminal adapter TA2 confirmed later by N, a release message (REL, I frame, TE2) is sent from the ISDN to the terminal adapter TA2 (step (7)). ).

Upon receiving the release message (REL, I frame, TE2), the terminal adapter TA2 receives the release completion message (REL COMP, I frame, TE).
2) is transmitted to ISDN and the process is terminated (step (8)).

The terminal adapter TA1 receives the response message (CONN ACK, I frame, TE) from the ISDN.
When 1) is received, an incoming signal (Calling Indication, ringing, etc.) for notifying the terminal device DT1 that the call setup is occurring is transmitted for the first time (step (9)).

When the terminal device DT1 receives the incoming call signal, the terminal device DT1 executes an incoming call process, and transmits an incoming call acceptance signal for accepting the incoming call in order to cause the terminal adapter TA1 to perform the call connection operation. (Step (10)). As a result, the call connection operation of the terminal adapter TA1 to the terminal device DT1 is performed, and the B channel (B1ch or B2c
h) is connected and communication on this channel is started (step (11)). Then, when the communication ends, a predetermined call is released and the channel (B1ch or B2ch) is released.
To release.

According to this embodiment, the above step (6)
At the time when the ISDN sends a response confirmation message (CONN ACK, I frame TE1) to the terminal adapter TA1, the ISDN sends a release message (REL, I frame, TE2) to the terminal adapter TA2. Release complete message (REL
COMP, I frame, TE2) is terminal adapter TA2
From the terminal device DT2 by being transmitted from ISDN to
Can wait for the next call, the terminal device DT
2 is not unnecessarily occupied, and the adverse effect on the line traffic is avoided. In addition, two B channels (B1ch and B2
two terminal devices DT1 and DT that are non-fixedly connected to ch)
It is possible to sequentially search for each of the two items as a search target.

In the above embodiment, the steps (1)-
In (5), when each of the terminal adapters TA1 and TA2 receives the call setting message (SETUP, UI), each of the terminal adapters TA1 and TA2 is connected only when the terminal devices DT1 and DT2 connected thereto can receive the call. Sends a call message (ALERT) and a response message (CONN) to the ISDN, each terminal adapter TA1, TA2 calls a call setup message (SETUP,
UI), when receiving the terminal device D connected to it
The call message (ALERT) and the response message (CONN) may be unconditionally transmitted from each of the terminal adapters TA1 and TA2 to the ISDN regardless of whether the T1 and DT2 can receive the call. In this case, each of the terminal adapters TA1 and TA2 sends a call setup message (SET
UP, UI) even if it receives each terminal device DT1, DT2
The same as in the above embodiment, that the incoming call signal is not transmitted to the.

As described above, the terminal adapters TA1 and TA2 unconditionally send the call message (ALERT) and the response message (CONN) to the ISDN regardless of whether the terminal devices DT1 and DT2 can receive the call. If so, the response message (CONN) is I
After the terminal adapter TA1 transmits an incoming call signal to the terminal device DT1 which has been confirmed by the SDN first (step (9) above), the above step (1
When the incoming call acceptance signal of 0) is not transmitted from the terminal device DT1 to the terminal adapter TA1, the terminal adapter TA
1 may release a call to the B channel (B1ch or B2ch). In such a case, the terminal adapter TA1 preferably notifies the calling side terminal device that the terminal adapter TA1 does not respond before releasing the call.

In the above embodiment, each terminal device DT1
The case where the terminal adapters TA1 and TA2 are respectively connected to DT2 and DT2 has been described.
If T1 and DT2 are terminal devices that do not require a terminal adapter, the terminal adapters TA1 and TA2 are unnecessary. In this case, the incoming call control process as described above is performed by the processing device in the terminal device.

Further, in the above embodiment, two terminal devices which are non-fixedly connected to two B channels among two B channels and one D channel shared by one multiplexing line L1. Although the incoming call control for the above has been described, for the plurality of terminal devices connected to one D channel among two B channels and one D channel shared by one multiplexing line L1 The same control can be performed, and it is also possible to sequentially perform a search with each of a plurality of terminal devices connected to one D channel as a search target.

[0046]

According to the present invention, when a plurality of terminal equipments are connected to one multiplexing line of the data communication switching network, the terminal equipments can be sequentially searched for as a search target.

[Brief description of drawings]

FIG. 1 shows a configuration of a user system for one line connected to ISDN.

FIG. 2 shows an incoming call sequence in an embodiment of the present invention when a calling request is made to a multiplexed line L1 from a calling side terminal device connected to another line (not shown). There is.

FIG. 3 shows a conventional incoming sequence when a calling request is made from a calling side terminal device connected to another line (not shown) for a multiplexed line L1.

[Explanation of symbols]

 ISDN Integrated Services Digital Network L1 Multiplexed Line TA1 Terminal Adapter TA2 Terminal Adapter DT1 Terminal Equipment DT2 Terminal Equipment

Claims (10)

(57) [Claims] 1. An incoming call control device for a terminal device when a plurality of terminal devices are connected to one multiplexing line of a data communication switching network, the call setting message from the data communication switching network. Means for transmitting a response message for each terminal device indicating that each terminal device has responded to the data communication switching network without notifying each of the terminal devices that an incoming call has been received, A terminal corresponding to the received response confirmation message when the response confirmation message from the data communication switching network for the response message that the data communication switching network has confirmed first among the device-specific response messages is received. Means for notifying the device that there is an incoming call so that the device can receive the incoming call, and the data communication switching network of the response message for each terminal device When a release message from the data communication switching network for the second and subsequent confirmed response messages is received, a release completion message for the terminal device corresponding to the received release message is sent to the data communication switching network. An incoming call control device comprising means for transmitting. 2. The data communication switching network is ISDN, the multiplexed line shares two B channels and one D channel, and the plurality of terminal devices are connected to the B channel. The incoming call control device according to claim 1, which is one terminal device. 3. The incoming call control device according to claim 2, wherein the incoming call control device comprises a plurality of terminal adapters respectively connected to the respective terminal devices. 4. The switching network for data communication is ISDN, the multiplex line shares two B channels and one D channel, and the plurality of terminal devices are connected to the D channel. The incoming call control device according to claim 1, wherein the incoming call control device is the terminal device. 5. The incoming call control device according to claim 4, wherein the incoming call control device comprises a plurality of terminal adapters respectively connected to the respective terminal devices. 6. A method for controlling an incoming call to a terminal device when a plurality of terminal devices are connected to one multiplexing line of a data communication switching network, the call setting message from the data communication switching network. When receiving the message, the terminal device-specific response message indicating that each of the terminal devices has responded is transmitted to the data communication switching network without notifying the terminal devices of the incoming call, A terminal device corresponding to the received response confirmation message when a response confirmation message is received from the data communication switching network in response to the response message that the data communication switching network confirms first among the different response messages. To notify that there is an incoming call to make an incoming call, and in the response message for each terminal device, the above-mentioned data communication switching network confirms the second and subsequent ones. When receiving a release message from the data communication switching network in response to the response message, a termination control method for transmitting a release completion message for the terminal device corresponding to the received release message to the data communication switching network. . 7. The switching network for data communication is ISDN, the multiplexing line shares two B channels and one D channel, and the plurality of terminal devices are connected to the B channel. The incoming call control device according to claim 6, which is one terminal device. 8. The incoming call control device according to claim 7, wherein the incoming call control is performed by a plurality of terminal adapters respectively connected to the respective terminal devices. 9. The switching network for data communication is ISDN, the multiplex line shares two B channels and one D channel, and the plurality of terminal devices are connected to the D channel. 7. The incoming call control device according to claim 6, which is the terminal device. 10. The incoming call control device according to claim 9, wherein the incoming call control is performed by a plurality of terminal adapters respectively connected to the respective terminal devices.