JP3001449B2 - Recalling method by calling control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a call control device in communication, and more particularly, to a re-call method by the call control device.

[0002]

2. Description of the Related Art In general, a call control device is used as a means for connecting a computer device having a communication function to a destination, but a line cannot be normally connected to a destination station at the first call. In this case, as described in detail in, for example, Japanese Patent Laid-Open Publication No. Hei 6-291822 (calling device for communication device), a plurality of lines are selected in order from the line with the highest priority and a call is re-issued. . Also, at this time, in order to improve the probability of line connection, it has been made impossible to re-call from the same line to the same destination within a predetermined time.

FIG. 4 shows the configuration of the call control device in the above publication. In FIG. 4, the call control device 29 includes an idle line selection unit 21, a re-call control unit 27, a transmission state monitoring unit 22,
It consists of timer values 23-26.

[0004] When the call control unit 29 receives a call instruction from the call instruction unit 20, the vacant line selection unit 21 searches for a vacant line and makes a call from the communication unit 28. The transmission state monitoring unit 22 monitors the transmission state, and when detecting that a transmission abnormality has occurred, turns on a timer (for example, a one minute timer) corresponding to this line. The recall control unit 27 monitors the timer, and prohibits recall from a line whose timer is on. On the other hand, when the timer times out, re-permission is permitted. As a result, a call can be made to the same destination from a plurality of lines, so that communication to the same destination can be speeded up. On the other hand, while the timer is on, you cannot make a call again.
The problem that a call is re-issued within a predetermined time can be solved.

[0005]

The recalling method by the above-mentioned calling control device is based on a line in which a recall is made among a plurality of lines, for example, a line. In the case where the connection has succeeded on the line of No. 4 (it is not necessary to be No. 4 and this value may be arbitrarily determined), if the connection of No. 4 is successful. 0-No. It is more likely that the other party was talking on the phone than that all three circuit routes were abnormal. Therefore, in this case, it is desirable to reconnect from the first line with the highest priority (generally, economy is emphasized). However, the conventional call control device selects a plurality of lines in order from the line with the highest priority and makes a call. Even if a connection is successful on a certain line, the call is continued on that line. As a result, there was a possibility that the service for the user was lacking.

SUMMARY OF THE INVENTION The present invention solves such a problem.
If the connection is successful on a certain line, it is considered that the other party's call state has been released, and the call control device can reconnect to the line with the highest priority and improve the serviceability to the user. It is to provide a recall method.

[0007]

SUMMARY OF THE INVENTION According to the present invention, when a call cannot be normally established at the time of calling, the line used for the calling is set to a recall waiting state where calling is prohibited for a certain period of time. In a recalling method by a calling control device for selecting and recalling a plurality of other free lines in order from a line having a higher priority by a calling means, if the connection is successful in the recalling, the recalling up to that time is performed. When the number of lines waiting for a call is equal to or greater than a predetermined value, the connection is switched back to the line with the highest priority among the lines waiting for a re-call.

A second invention is characterized in that the switching back to the highest priority line in the present invention is performed after disconnection of the line that has been successfully connected in the re-calling.

A third invention is characterized in that in the second invention, the disconnection of the line to which the connection has succeeded in the re-calling is performed after a predetermined message is transmitted to the connection partner.

According to a fourth aspect of the present invention, in the switching back to the highest-priority line in the present invention, the highest-priority line in the re-call waiting state is set as an idle line and the re-calling means is activated. It is characterized by being performed by doing.

[Operation] According to the recalling method by the calling control device of the present invention, during a recall using a plurality of lines in succession, if the connection succeeds on a certain line, the communication state of the other party is released. And reconnect to the line with the highest priority.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In FIG. 1, reference numeral 20 denotes a call instructing unit, which corresponds to an instruction from a user or a recall instruction from a recurrence control unit 27 described later. Reference numeral 21 denotes an idle line selection unit for selecting an idle line of the communication unit 28. When a priority is assigned to a line, the idle line selection unit 21 selects a line according to the priority. Reference numeral 22 denotes a transmission state monitoring unit that monitors the transmission state of the communication unit 28, and 23, 24, 25, and 26 denote timers provided for each line. These timers are, for example, one minute timers, and are activated when the corresponding line waits for a recall. 27 is a recall control unit. The recall control unit 27 prohibits recall while the timer is operating, and permits recall when the timer ends operation. The timer is not limited to one minute, and any timer may be used as long as the number of recalls does not fall within two times in three minutes. If the transmission state monitoring unit 22 does not detect a transmission abnormality, that is, if the transmission state monitoring unit 22 has successfully entered a telephone conversation state with the other party, the switchback control unit 29 can determine that the other party has been talking with the other party until then. The disconnection control unit 30 is instructed to disconnect the connected line, and when the disconnection is completed, a request is made to the call instructing unit 20 via the recalling control unit 27 to make a recall, and to the idle line selection unit 21. Re-establish a call on an empty line with the highest priority. Upon receiving the disconnection instruction from the switchback control unit 29, the disconnection control unit 30 outputs a disconnection message to the connection partner, and then outputs a communication line disconnection instruction to the communication unit 28.

As a method for the switchback control unit 29 to determine that the other party has been talking on the telephone, there is a method for determining the number from the number of lines waiting for a recall before reaching the talking state. This is because the probability that all of the routes become abnormal is extremely low, and in such a case, it is more appropriate to determine that the other party is busy with another. In this case, the value of the number of lines waiting for a recall may be arbitrarily determined by the system or may be set by the user. Generally, it is hardly conceivable that connection abnormalities occur in three or more lines at the same time.

Further, as described above, if it is determined that the other party has been talking, the cutback control unit 29 instructs the disconnection control unit 30 to disconnect the currently connected line, as described above. When the disconnection is completed, a request is made to the call instructing unit 20 via the recall control unit 27 to request a recall, and a recall is performed on the line with the highest priority. First, a return instruction is output to the re-call control unit 27. Recall control unit 2 receiving the switch back instruction
7 causes the transmission state monitoring unit 22 to reset the value of the timer of the line on which the timer is operating. Next, the recall control unit 27
Sets a line in which use of the communication unit 28 (re-calling) is prohibited, and makes a normal calling request to the calling instruction unit 20. The vacant line selection unit 21 that has received the recall request from the call instruction unit 20 via the recall control unit 27 selects the vacant line with the highest priority and places a call.

Next, the operation of the present invention will be described with reference to FIG. FIG. 2 is an operation flowchart of the present invention.

When there is a call request from the call instruction unit 20,
In step S1, a call is started from one of the idle lines. In step S2, it is determined whether or not the transmission is normally performed. If the other party is busy or a communication error is detected, the process proceeds to step S3. If the process proceeds to step S3, it is determined whether a recall is necessary. If the system is set to recall, the process proceeds to step S4, and if it is set not to recall, the process ends. In step S4, a one-minute timer is set for the line. In step S5, it is determined whether or not the timer is on. If it is on, it is determined in step S6 whether or not there is a free line. If it is determined in step S6 that there is an empty line, the process proceeds to step S7, and the line is switched to the empty line. Then, in step 8, a call is started on the line. Thereafter, the process returns to step S2 and the same operation is repeated. On the other hand, if the counting by the timer ends and the determination in step S5 becomes negative,
Proceeding to step S10, a recall is started on the line.

If it is determined in step S2 that the transmission has been performed normally, the flow advances to step S9 to count the number of waiting lines for recall at that time. The process proceeds to S10, and if not, the process proceeds to step S9, and the operation is terminated after the completion of transmission.
In step S10, it is determined whether or not there is a request from the user to switch back. If not, the process proceeds to step S9.
If there is a request for switchback from the user, step S11
To perform disconnection processing of the currently connected line. In this case, if the other party is a facsimile terminal, this is not necessary, but if the other party is a telephone, not shown, but it is necessary to notify the other party of a switchback message by voice synthesis.
When step 11 is completed, the process proceeds to step 12, where the operating timer is reset to wait for a recall. Next, the process proceeds to step 13, in which a recall is started from the line having the highest priority among the lines whose timer has been reset. Thereafter, the process returns to step S2 and the same operation is repeated.

[0020]

As described above, according to the recalling method by the calling control device of the present invention, during a recall using a plurality of lines in sequence, when a connection is successfully established on a certain line, the other party's call can be made. By regarding that the state has been canceled and reconnecting to the line with the highest priority, there is an effect that the serviceability for the user can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an operation flowchart of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 Calling instruction unit 21 Unused line selection unit 22 Transmission state monitoring unit 23, 24, 25, 26 Timer 27 Recall control unit 28 Communication unit 29 Switchback control unit 30 Disconnection control unit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04M 1/27 H04M 11/00 303 H04N 1/32

Claims (4)

(57) [Claims] When a call cannot be normally connected to a destination station when a call is made, the line used for the call is set to a re-call waiting state in which calling is prohibited for a certain period of time, and a plurality of other idle calls are made by the re-call means. In the recalling method by the calling control device for selecting and re-calling a line in order from a line having a higher priority, if the connection is successful in the re-calling, the number of lines waiting for the re-calling until then. If the value is equal to or greater than a predetermined value, the connection is switched back to the line having the highest priority among the lines waiting for the re-calling. 2. The recalling by the call control device according to claim 1, wherein the switching back to the line with the highest priority is performed after disconnection of the line that has been successfully connected in the recalling. method. 3. The call control device according to claim 2, wherein the disconnection of the line that has succeeded in the connection by the re-calling is performed after a predetermined message is transmitted to the connection partner. Call method. 4. The switching back to the highest priority line is performed by setting the highest priority line in the waiting state for recalling as an idle line and activating the recalling means. A recalling method by the calling control device according to claim 1.