JPH06276564A - Selecting method for terminal line in private branch exchange - Google Patents

Abstract

PURPOSE:To improve communicable probability by selecting a terminal line having the possibility of responding and being made the line to receive. CONSTITUTION:This private branch exchange is provided with a memory 24 storing the number and the kind of terminal connected with each terminal line A, B, C,... N, the kind of terminal using the channel of each terminal line and a channel in use and a central processing unit 23 having a means discriminating whether a terminal which coincides with the kind of an incoming terminal exists or not when an incoming exists in a terminal line and a means deciding whether the coincident terminal is in an incoming possible state or not. When the coincident terminal does not exist and the coincident terminal is not in the incoming possible state, the incoming is made to receive at the terminal which is possible to receive of other terminal line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line selecting method in a private branch exchange (PBX) accommodating a terminal line such as an ISDN terminal line.

[0002]

2. Description of the Related Art A PBX that accommodates a plurality of ISDN terminal lines for connecting ISDN terminals and forms a communication path with an ISDN network is a call that uses the channel of each ISDN terminal line. In this configuration, a means for determining the used channel and a memory for holding the used channel are provided. These multiple ISDN terminal lines
For example, each section in the company was connected to the PBX as a representative group line.

A conventional method of selecting a terminal line in a private branch exchange having such a configuration is to judge a channel used by the call when a call to / from a terminal connected to the terminal line is detected, and store the result in a memory. Hold. In this state, when an incoming call occurs in the representative group to which the ISDN terminal line belongs, and if all the channels assigned to that line are in use, the ISDs of other representative groups
I was trying to select N terminal lines.

Therefore, when an ISDN terminal receives an incoming call and all the channels of the representative group assigned to the ISDN terminal line are in use, the ISDN terminal line of another representative group is selected. IS
It enabled incoming calls from the DN network.

[0005]

However, in the above-mentioned conventional method of selecting a terminal line in a private branch exchange, whether or not to respond to an incoming call depends on the intention of the connected terminal (own terminal attribute and terminal of the incoming call). It depends on whether the attributes match or not), so even if a channel is available and an incoming call is made, communication is not possible unless the attributes of the terminal match.
Even if the SDN terminal line is selected, there is a problem that communication is not actually performed.

An object of the present invention is to solve such a conventional problem, and it is intended to improve the probability that communication becomes possible by selecting a line that may respond and making an incoming call. It is a thing.

[0007]

In order to achieve the above object, the present invention is directed to the number and types of terminals connected to each terminal line, and the type and types of terminals using channels of each terminal line. A memory to store the channels in use, 1
When there is an incoming call on the terminal line of, there is a means for determining whether there is a terminal that matches the type of the receiving terminal, and a means for determining whether the matching terminal is in a call-ready state. If there is no matching terminal or if the matching terminal is not in the call-ready state, the call is made to a terminal capable of receiving a call on another terminal line.

[0008]

Therefore, according to the present invention, it is determined whether or not to make an incoming call based on whether or not a terminal capable of communication is connected, not whether or not there is a vacant channel. Make sure you choose
You can make incoming calls.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a diagram showing a system of an embodiment to which a terminal line selecting method in a private branch exchange of the present invention is applied. Figure 1
, 1 is an ISDN network, 2 is a private branch exchange (PB
X) and 3 are terminating devices (DSU) that connect the 2B + D office line of the ISDN network 1 and the PBX 2. The inside of PBX2 is an ISDN trunk (TR) connected to DSU3.
21, a communication path switch (SW) 22, a central processing unit (CPE) which is a control means for performing circuit switching control of the PBX 2, and other controls, a memory (MEM) 24 which is a storage means for storing data, and a plurality of terminals for connection. Interfaces (INF) 25A, 25B, 25C, ..., 25 for connecting the ISDN terminal line and the communication path switch 22
It consists of N.

The plurality of INFs 25A, 25B, 25
C, ..., 25N are ISs for a plurality of groups, respectively.
DN terminal lines are connected to the central office lines A, B, C, ..., N. Up to 8 terminals can be connected to each ISDN terminal line. In ISDN terminal line A of group A,
Two telephones 4, 5, 2 Data terminal devices 6, 7, 1
G3 facsimile 8, two G4 facsimile 9,
10 and one TV conference terminal 11 are connected. Further, the G3 facsimile 12 and other terminals are connected to the ISDN terminal line B of the group B.

FIG. 2 is a diagram showing the contents of the data stored in the memory 24 of FIG. 1, in which (a) shows the number and types of terminals connected to the ISDN terminal line A, and (b) ) Indicates the type of call using the channel of this ISDN terminal line A and the channel number used.

Next, the operation of this embodiment will be described with reference to FIGS. FIG. 3 is a diagram showing an operation flow in the case of transmitting from a terminal connected to the ISDN terminal line. When the origination from the terminal is detected, the type of the terminal of the call is registered in the memory 24 of FIG. 1 (step S11), the B channel number to be used is registered (step S12), and the origination operation is performed (step S13).

FIG. 4 is a diagram showing an operation flow when there is an incoming call to a terminal connected to the ISDN terminal line. When an incoming call to the ISDN terminal line occurs, the number of terminals that match the type of terminal of the incoming call is read from the memory 24 and determined (step S21).

Subsequently, it is determined how many calls of the corresponding type exist on the same line in a communication state, that is, the number of terminals in communication operation (step S22). If the result of this determination is that the number of terminals in communication is less than the registered number, that is, if there is a terminal capable of receiving an incoming call, the type of that terminal is registered (step S23), and the channel number to be used is registered (step S24). , Make an incoming call (step S2)
5).

On the other hand, in step S22, when all terminals of the type corresponding to the incoming call are in communication,
Since the terminal cannot be connected to the terminal, an incoming call is made to the line of another representative group (step S26). If the number of connected terminals corresponding to the incoming call is 0 in step S21, another representative group line is similarly selected (step S26).

Thus, according to the above embodiment, for example, as shown in FIG. 2B, the G of the ISDN terminal line A is
When the 3 facsimile 8 is communicating using the B1 channel and the G3 facsimile receives an incoming call, communication is not possible because there is only one G3 facsimile even if the B2 channel of this line is idle. Even in such a case, it is possible to enable communication by selecting the ISDN terminal line B which is a line of another representative group and making the G3 facsimile 12 connected to the line receive the call.

[0017]

As is apparent from the above embodiment, according to the present invention, whether or not to make an incoming call depends on whether or not a terminal capable of communicating is connected to the terminal line. It is possible to reliably select a terminal that has the possibility of being able to do so.

[Brief description of drawings]

FIG. 1 is a diagram showing a system of an embodiment to which a terminal line selecting method of the present invention is applied.

FIG. 2 is a diagram showing the contents of data stored in a memory 24 of FIG.

FIG. 3 is a diagram showing an operation flow when a call is made from a terminal connected to an ISDN terminal line.

FIG. 4 is a diagram showing an operation flow when there is an incoming call to a terminal connected to an ISDN terminal line.

[Explanation of symbols]

 1 ISDN network 2 Private branch exchange (PBX) 3 Termination device (DSU) 4-12 Line terminal A, B, C, N ISDN terminal line

Claims (2)

[Claims] 1. A method of selecting terminal lines in a private branch exchange that accommodates a plurality of terminal lines for connecting one or more terminals, the number and types of terminals connected to each terminal line, and each terminal line. A memory for storing the type of terminal using the channel and the channel in use, and means for determining whether or not there is a terminal that matches the type of the receiving terminal when an incoming call is made to the terminal line of 1. , If there is no matching terminal, or if the matching terminal is not in the incoming-call ready state, the other terminal line is called. A method of selecting a terminal line in a private branch exchange, characterized by allowing an incoming call to an available terminal. 2. The method of selecting a terminal line in a private branch exchange according to claim 1, wherein the terminal line is an ISDN terminal line.