JPH1093718A - Busy terminal calling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a busy terminal calling system with which either a call back to avoid the useless hold of a call originating line or to wait to avoid a procedure for call re-origination can be selected, according to the desire of a caller. SOLUTION: A call-terminating station 2 is provided with a busy monitoring part 22 for monitoring a call terminating terminal 3 while receiving start, detecting an idle state and reporting it while containing busy processing designation to designate the call back or wait of busy processing at the call terminating terminal 3 in the format of a call originating request (CR), to be sent from a call originating terminal 1 to the call terminating station 2 and a call control part 21 for receiving the call originating request, starting the busy monitoring part 22 when the call terminating terminal 3 is busy, requesting the disconnection of the line to the side of call origination at the time of call back designation in busy processing designation, sending out the format of a call re-originating request (RC) to call call re-origination to the call originating terminal 1, when the busy cancel of the call terminating terminal 3 is reported from the busy monitoring part 22, and performing a call terminating procedure, when the busy cancel of the call terminating terminal 3 is reported at the time of wait designation on the other hand.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a busy terminal paging method for calling a busy called terminal when a call request is received, and more particularly, to a busy state of a packet switch with only a simple process added. Busy call that can be selected by the caller's will to avoid a continuous call request to the called terminal and to return the call to avoid unnecessary holding of the calling line or to wait to avoid re-calling It relates to a terminal calling method.

[0002]

2. Description of the Related Art Conventionally, in this type of busy terminal paging method, for example, in the case of packet switching, as shown in FIG. 3, a calling station receiving a call request (CR) packet from a calling terminal 10 as shown in FIG. The call controller 100 sends the received call request (CR) packet to the call controller 20 of the called station. When the call control unit 20 of the called station that has received the call request (CR) packet detects that the called line to the called terminal 30 is busy, a restoration request (CQ) due to the busy of the called terminal is immediately made. Sends the packet to the call control unit 100 of the calling station,
Indicates disconnection request (CI) of received recovery request (CQ) packet
The packet is converted to a packet and sent to the calling terminal 10 to be sent to the calling terminal 1.
0 indicates that the called terminal 30 is busy.

[0003] When the calling terminal 10 stops calling and disconnects the call, a recovery acknowledgment (CF) packet is sent to the calling terminal 10.
From the calling station to the call control unit 20 of the called station via the call control unit 100 of the calling station, and the call control unit 100 of the calling station and the call control unit 20 of the called station are released from the call connection.

[0004] In this configuration, the call control unit 20 of the called station,
When the busy state of the incoming line to the called terminal 30 is detected, a restoration request (CQ) packet for the busy state of the called terminal is immediately returned to the calling terminal 10 via the call control unit 100 of the calling station. Therefore, the calling terminal 10 that has received the recovery request (CQ) packet due to the busy state of the called terminal recalls at an appropriate time.

However, since the calling party cannot determine the communication termination time of the called party, the calling party repeats the call many times while the called terminal 30 is busy. All the re-calls by these calling terminals 10 cannot be connected to the called terminal 30, and a plurality of the above packets are transmitted between the calling terminal 10, the calling station's call control unit 100 and the called station's call control unit 20. Will go back and forth.

[0006] The problem that the caller needs to repeat the recall operation many times until the called party terminates the communication is solved, and the trouble of the caller's recall is eliminated. A technology that can connect a called party to a communication path with a minimum waiting time is described in, for example, Japanese Patent Application Laid-Open No. 2-39762.

[0007] The telephone exchange disclosed in this publication is
A connection request holding unit that recognizes an automatic call connection request from the caller when the called party is busy and holds a connection with the caller;
According to the status of the call monitoring unit for monitoring the call of the called party and the status of the connection request holding unit and the monitoring information from the call monitoring unit, when the called party is busy, the call waiting for the connection with the calling party is terminated. A connection control unit for making a connection in such a case.

If this telephone exchange is applied to a packet exchange, as shown in FIG. 4, the packet exchange of the called station 200 includes a call control unit 201 and a call monitoring unit 202.
The call control unit 201 transmits a call request (CR) from the calling terminal 10.
If the called terminal 30 is busy when receiving the packet, the call monitoring unit 202 is activated, and if a call termination confirmation of the called terminal 30 is received from the call monitoring unit 202, the call received earlier is received. The request (CR) packet is converted into a call (CN) packet and sent to the called terminal 30, and as a result, the call accepted (CA) packet received from the called terminal 30 is converted into a connection completion (CC) packet. It is formed and sent to the calling terminal 10.

However, in this configuration, the trouble of recalling while the called terminal 30 is busy can be avoided, and a connection can be made to the vacated called terminal 30 with a minimum waiting time. In the case of 10, there is a problem that another call cannot be made and that the line is occupied and the line is busy, so that a call cannot be received from another subscriber.

[0010] As a technique for solving this problem, there is a voice message service already used for ordinary telephones. The technology of the voice message service is described in, for example, Japanese Patent Application Laid-Open No. 2-59959.

According to this caller return service system,
When the caller dials the number of the called party who is busy and the caller's connection is in communication with the voice storage device, the voice storage device receiving the special number from the caller sends the special number to the exchange. The number is conveyed and the switch is ringing the calling party when the called party becomes idle.

[0012]

Among the above-mentioned conventional busy terminal calling systems, in the configuration of the telephone exchange described in the first publication, as described above, the exchange determines whether the called terminal is idle. After the detection, the calling terminal and the called terminal are connected, so the caller waits until the called party's communication is completed, so the line is occupied and busy, and the call can be received from another subscriber. There is a problem that can not be.

Further, in the system described in the above-mentioned second publication, once a special number is required after connection to the voice storage device, additional equipment is required and the calling party is called the called party. There is a problem in that a trouble of re-calling is required when the notification that the call is empty is received.

SUMMARY OF THE INVENTION An object of the present invention is to provide a format for call control in accordance with a predetermined protocol, and to avoid a continuous call request for a busy called line by simply adding simple processing in an exchange and a terminal. An object of the present invention is to provide a terminal calling method and solve the problems of the first and second publications.

[0015]

SUMMARY OF THE INVENTION A busy terminal calling system according to the present invention is a busy terminal calling system for calling a called terminal which is busy when a call request is received. The outgoing call request includes a busy process designation information for designating either a call back or a wait in the process when the called line is busy, and is specified when the exchange is activated. A busy monitoring unit that monitors and monitors the communication status of the called line, and outputs a notification that an idle state of the called line has been detected, and the called line is busy when the call request is received. In response to the call-back designation of the busy processing designation information, the busy monitor is activated and a caller is requested to disconnect the line by a predetermined procedure. When a notification of busy release is received, a predetermined recurrence prompting the On the other hand, when the request is transmitted, the busy monitoring unit is activated in response to the waiting designation of the busy processing designation information, and then, when the busy monitoring unit is notified of the busy release of the called line by the busy monitoring unit. And a call control unit for performing a predetermined incoming call procedure.

In this configuration, when the incoming call line is busy in response to a call request transmitted when a call is made from the terminal to the exchange, either the call back or the waiting is performed in the process of releasing the busy state. Since the busy process specification information that specifies the call is included in the format, a call return that can avoid unnecessary holding of the calling line,
Alternatively, any one of the waiting processes that can avoid the trouble of recalling is selected and executed by the caller's intention.

[0017]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a functional block diagram and a sequence chart showing an embodiment of the present invention. The busy terminal paging method shown in FIG. 1 is based on ITU-T (Internatio
nalTelecommunication Union-Telecommunication Sta
Recommendation X.ndardization Sector: Telecommunication Standardization Sector of the International Telecommunication Union It is a functional block and a sequence chart in the case of packet exchange based on the rule of 25 (call).

FIG. 1 shows a case where a call is connected from a calling terminal 1 to a called terminal 3 via a called station 2. It is assumed that the called station 2 includes a call control unit 21 and a busy monitoring unit 22.

In the facility area on the call request (CR) packet, as a parameter value of the busy facility, when the called line is busy, either a call return or a waiting process is designated. Information shall be included. Further, in the case of this call return, the calling station 2
A recall call (RC) packet is provided for the call to be sent to. It is assumed that the recall request (RC) packet has a format similar to the incoming call (CN) packet in order to call the terminal.

The difference from the prior art is that when the calling terminal 1 places a call, a call request or a waiting process is specified on a call request (CR) packet when the called line is busy. In the case of this call return process, the called station 2
Disconnect instruction to calling terminal 1 when called terminal 3 is busy (CI)
Requests disconnection of the call by packet, and then the called terminal 3
Is released from the calling terminal 1 when the busy state of the call is released (R
C) Sending a packet to prompt re-calling, and calling terminal 1 receiving a re-call request (RC) packet receiving a prompt to re-call.

When the calling terminal 1 receives a disconnection instruction (CI) packet in response to the transmission of a call request (CR) packet in which the busy process specification information for call back is specified in the facility area, the calling terminal 1 makes this call. And performs a predetermined release procedure of returning a restoration confirmation (CF) packet, and then, upon receiving a recalling call (CN) packet, transmitting a restoration request (CQ) packet for disconnecting the call, After receiving a recovery acknowledgment (CF) packet responding to this packet and confirming the recovery, the call is re-established by retransmitting a call request (CR) packet.

When the call control unit 21 of the called station 2 receives a call request (CR) packet in which the busy process specification information for call back is specified in the facility area, the called line for the called terminal 3 is set to talk. If it is in the middle, the busy monitoring unit 22 is activated, and at the same time, a call disconnection request (CI) packet is transmitted to the calling terminal 1 to request disconnection of the call, and the disconnection is confirmed by the restoration confirmation (CF).

Next, the call control unit 21 transmits
, Upon receiving a notification that the called line of the corresponding called terminal 3 has been released from the busy state, a recall request (RC) packet is sent to the calling terminal 1 to urge recall.

The busy monitoring unit 22 receives the addresses of the calling and called terminals from the call control unit 21 and monitors whether the called line for the called terminal 3 is busy. The call control unit 21 releases the busy state together with the calling terminal address to be used.
Shall be notified.

Next, referring to FIG. 1 and FIG. 2, a description will be given of a main operation procedure in the called station of the packet switch according to the present invention.

First, when receiving a call request (CR) packet from the calling terminal 1 to the called terminal 3 (step S1), the call control unit 21 identifies the called line position from the called terminal address. (Step S2), the received call request (CR) packet is held (Step S3), and the parameter value in the busy facility in the facility area is checked (Step S2).
4).

If the parameter value is call back (YES in step S5), the call control unit 21 stores the operation when the called line is busy as a call back (step S6), and the call control unit 21 is busy. The state is checked (step S7).

When the called line is busy (YE in step S8)
S), the call control unit 21 activates the busy monitoring unit 22 (step S9), and stores the operation when the called line is busy as a call back in step S6 (YES in step S10). A disconnection instruction (CI) packet is sent to the calling terminal 1 for the disconnection processing of the calling line, and the held call request (CR) packet is discarded (step S11).

The busy monitoring unit 22 started in step S9 monitors the called line of the called terminal 3 and, when detecting the vacancy of the called line, releases the busy state together with the associated calling / calling terminal address to the call control unit. Notify 21.

When the busy state of the called line is received by releasing the busy state (procedure S12), the call control unit 21 stores the operation during the busy state of the called line as a call back in step S6 (procedure). S1
3 (YES), a recall request (RC) packet is sent to the calling line addressed to the calling terminal 1 (step S14), and the procedure ends.

In the subsequent procedure, as shown in the sequence chart of FIG. 1, the procedure of disconnecting the incoming call by the calling terminal 1 and then performing the re-calling procedure is performed.

On the other hand, when the above procedure S5 is "NO" and the parameter value is waiting, the process is the same as the sequence chart shown in FIG. 4, and the call control unit 21 waits for the operation during the busy of the incoming line. Is stored (procedure S21), and the process proceeds to step S7 for checking the busy state of the called line.

If the parameter value is awaiting, and the above-mentioned step S10 is "NO", the procedure skips step S11 and proceeds to step S12 in which the idle state of the called line is released by canceling the busy state. In the case of, the pending call request (C
R) The packet is converted into a call (CN) packet, sent to the called terminal 3 and sent to the called line (step S22), and the procedure ends. The following procedure is a normal incoming call procedure.

In the above description, ITU-T Recommendation X. 25
(Call) A packet is provided in accordance with the format of the layer 3 and a designation request is provided in the facility area of the packet. This is applicable by designating busy process designation information or providing a format for designating a recall request.

In the above description, only the busy state of the called terminal in the called station has been shown and described. However, even when all the receiving trunk lines in the relay station are in use, the line becomes available. In this case, the vacant line can be used immediately in the case of waiting, while the vacant line can be held and the recalling procedure can be performed in the case of a call back.

In the above description, the call control unit generates a call control format for calling the calling terminal for recalling and has a call promotion notifying function for prompting recall, but separately from the call control unit. A call promotion notifying unit may be provided. Also, for example, while the call request (CR) packet is held after the identification of the called line position in the procedure, the call request (CR) packet may be held immediately when the call request (CR) packet is correctly received. After storing the middle operation, the operation may be suspended.

As described above, the functions and procedures are illustrated and described. However, the distribution or the exchange of the functions by the separation / merging of the functions, the exchange before and after the procedures, the change of the parallel operation, and the like are free as long as the above functions are satisfied. It does not limit the invention.

[0039]

As described above, according to the present invention, when a call request transmitted when a call is made from a calling terminal to an exchange, the call return or waiting process is performed in the case where the called line is busy. The busy process specification information that specifies either
A busy monitoring unit that monitors and monitors the communication status of a specified called line when receiving a call, and outputs a notification that a free state of the called line is detected, and a call when a call request is received. If the line is busy, the busy monitoring unit is activated for the call back designation of the busy process designation information, and a request is made to the calling side to disconnect the line according to a predetermined procedure. When the notification of the release of the busy state of the corresponding incoming line is received from the, the predetermined re-call request for prompting the re-call is sent to the corresponding calling terminal, while the busy state is specified for the waiting processing of the busy processing specification information. A call control unit that activates the monitoring unit, and then performs a predetermined incoming call procedure when receiving a notification of the release of the busy state of the called line from the busy monitoring unit.

With this configuration, in the call processing control procedure, the format of the call request transmitted when a call is made from the terminal to the exchange is either a call return or a wait in the process when the called line is busy. Since the busy information that specifies one of them is included, it is possible to select either a call back that can avoid unnecessary holding of the calling line or a waiting time that can avoid the trouble of re-calling. A terminal calling method can be obtained.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of the present invention, and further includes a sequence chart.

FIG. 2 is a flowchart showing one mode of a main operation procedure in FIG. 1;

FIG. 3 is a functional block diagram and a sequence chart showing a conventional example.

FIG. 4 is a functional block diagram and a sequence chart showing another example of the related art different from FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 calling terminal 2 called station 3 called terminal 21 call control unit 22 busy monitoring unit

Claims (4)

[Claims] In a busy terminal paging method for calling a called terminal which is busy when a call request is received, a call request transmitted when a call is made from a terminal to an exchange is such that the called line is busy. In the processing in the case of the above, the busy state includes processing designation information for designating either the return call or the waiting state, and the exchange monitors and monitors the communication status of the designated called line when the exchange receives activation. A busy monitoring unit for notifying and outputting that a line vacancy has been detected, and, if the called line is busy when the call request is received, the call back designation of the busy process designation information is Activate the busy monitoring unit, request the calling side to disconnect the line in a predetermined procedure, and then, when receiving a notification from the busy monitoring unit that the called line is released from the busy state, call the corresponding calling terminal. Sends a predetermined recall request to prompt recall, while waiting for busy process specification information A call control unit that activates the busy monitoring unit, and then performs a predetermined incoming call procedure when a notification of busy release of the corresponding incoming line is received from the busy monitoring unit. A busy terminal calling method. 2. A method according to claim 1, wherein the packet switch monitors a communication state of a designated incoming line when receiving the activation. A busy monitoring unit for notifying and detecting that an idle state of a called line to be monitored is detected, and a call request (CR) packet having a predetermined call back setting as a busy facility in a facility area. When the called line is busy, the busy monitoring unit is activated with the calling / receiving terminal address of the calling request (CR) packet, the calling request (CR) packet is discarded, and the call request is sent to the calling side. Requesting disconnection of the line in accordance with the procedure described above, and then receiving a call release request (C
R) a call control unit for transmitting a predetermined recall request (RC) packet for urging a recall call to a packet transmitting terminal. 3. The called line is busy when the call control unit receives a call request (CR) packet having a predetermined waiting setting as a busy facility in a facility area. In this case, the call request (CR) packet is suspended and the busy monitoring unit is activated. Then, when the busy monitoring unit is notified of the release of the busy of the called line, the call is released. Incoming call request (CR) packet (CN)
A busy terminal paging method, which performs a predetermined incoming call procedure for converting the packet into a packet and transmitting the packet. 4. The calling terminal receiving the re-call request (RC) packet according to claim 2, analyzes the received packet, displays a message prompting the terminal to be called to be empty and promptly re-call. A busy terminal calling method.