JPS6232677B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for regulating early dialing of central office line calls in an automatic private branch exchange.

In automatic private branch exchange equipment (hereinafter referred to as PBX), when a Class A extension, which is restricted from making long-distance calls, makes a call to the central office line, the calling register is connected in parallel to the central office trunk, and the transmission is made from that extension. The call register monitors the number received and determines whether or not to restrict the connection.

If you want to make a call to a central office line from a PB extension telephone, you can easily dial from the PB extension telephone before you acquire the central office trunk and hear the dial tone from your station, so you can dial from the PBX's calling register. The dial you receive may be different from the dial you receive at your station.

To deal with this, conventionally a loop is closed for a certain period of time on the PBX's office line trunk or the extension side of the calling register, preventing the PB signal from being generated from the PB telephone, and allowing dialing after a certain period of time. A known method is to match the dial received by the register and the affiliated station, and use the PBX's calling register to determine whether or not it is an area number.

However, with this method, if the extension dials without checking the dial tone of the central office line, the several digits dialed before the dial tone of the home station is connected will not be sent to the home station, and only the dialed part will be sent. There are times when you are not able to connect to the person at the other end of the station you wish to talk to, and there are times when you make a mistake. Furthermore, there is a drawback that dialing can be continued without any restriction on the connection until the dialing is completed, and the affiliated station and central office line trunk are captured invalidly.

In addition, a loop is closed on the extension side of the PBX's central office line trunk or the originating register to prevent the generation of PB signals.For PBXs that cannot close such a loop, the PBX's originating register and the affiliated station receive There was a drawback that it was impossible to accurately determine whether the number was an area number or not, as it was impossible to even dial the correct number.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, that is, as mentioned above, even when a PBX cannot close a loop to the central line trunk of the PBX or the extension side of the calling register when making a central line call, If the calling extension dials without checking the dial tone of the home station, and if the dial tone of the home station has not yet been connected, the calling extension will not be able to talk to the desired party at that point. An object of the present invention is to provide a system for regulating early dialing of a central office line in an automatic private branch exchange, which notifies the calling extension and prevents the affiliated station and central trunk from being invalidly captured.

A feature of the present invention that achieves the above object is that in the automatic private branch exchange device connected to the affiliated station that receives the PB signal, the loop is closed to the affiliated station, and the dial tone connection of the affiliated station is completed. By leaving the call path between the extension and the central office trunk unconnected until a certain period of time has elapsed, and by allowing dialing from the PB extension telephone to be received during this certain period of time, When making a call to a central office line from a Class A PB extension phone that is restricted from making calls,
The purpose is to make it possible to regulate dialing by PB extension telephones until the dial tone connection of the affiliated station is completed.

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

1 to 3 are relay system diagrams for explaining an embodiment of the present invention. In Figures 1 to 3, SW is a switch (call path) in an automatic private branch exchange (hereinafter referred to as SW), CC is a central control unit (hereinafter referred to as CC), and LC is a line circuit (hereinafter referred to as CC). ), COT is the office line trunk (hereinafter referred to as COT), OR is the originating register (hereinafter referred to as OR),
PBR is a PB signal receiving circuit (hereinafter referred to as PBR).

When a PB extension whose long-distance calls are restricted picks up the handset, hears a dial tone, and then dials the number for making a local call, the CC captures the COT,
Closes the loop to the affiliated station and notifies the affiliated station that a call has been made. At this time, instead of connecting the SW between the extension and COT, CC counts the time it takes to connect the SW between the extension and COT after a certain period of time has passed when the dial tone connection of the affiliated station is completed. Begin to. At the same time, dials from the PB extension are monitored during this fixed period of time. At this point, the state shown in the relay system diagram of FIG. 1 is reached.

In the case of a PB extension, after dialing to make a call to the central office line, it is easy to immediately dial the number to be sent to the central office line, but if you are in this situation, check the dial tone of the station you belong to. If the caller dials without doing so, the CC will restrict calls to the central office line and restore COT, provided that the certain period of time has not elapsed.

If the extension does not dial until this certain period of time has elapsed, the CC connects the SW between the extension and COT after this certain period of time has elapsed, and at this time, the number that the extension dials to its affiliated station is In order to monitor the number or not, the OR remains connected and the second
The state shown in the relay system diagram in the figure is reached.

Next, as before, it is determined whether the extension dials a city code or not, and if the extension dials a city code, CC is COT, OR (PBR).
Then, restore the SW between the extension and COT, and the SW between the extension and OR, and restrict outgoing calls.

Also, if the extension dials a number that is not an area number, the CC is OR (PBR) and the extension and OR.
As shown in the relay system diagram in Figure 3, the extension line can talk to the other party on the central office line without any restrictions.

As described above, according to the present invention, the loop is closed to the affiliated station, and the switch between the extension line and the central office line trunk is not connected until a certain period of time has elapsed to complete the dial tone connection of the affiliated station. By being able to receive dials from the PB extension telephone for this certain period of time, when making a call to the central office line, the PBX can prevent loops from being closed to the central office line trunk of the PBX or to the extension side of the calling register. Even if the calling extension dials without confirming the dial tone connection of the home station, if the dial tone connection of the home station has not yet been established, at that point the calling extension will not be able to talk to the person it wishes to talk to. By informing the calling extension of this fact, it is possible to prevent the affiliated station and central office line trunk from being captured invalidly.

Although PB extensions have been explained above, it is clear that early dialing of rotary dial extensions can also be regulated using similar means.

[Brief explanation of the drawing]

Figure 1 is an embodiment of the present invention, which is a diagram of the relay system after an extension line whose long-distance calls are restricted dials a number for calling a central office line. Figure 3 is a diagram of the relay method after a certain period of time has elapsed to complete the dial tone connection of the station; FIG. It is a diagram.

Claims (1)

[Claims] 1. By dialing a central office line from the extension telephone of the automatic private branch exchange connected to the affiliated station, the loop of the central office line trunk of this automatic private branch exchange is closed to the affiliated station, and this loop is closed. The call path between this extension telephone and this central office line trunk will not be connected until a certain period of time has elapsed to complete the call connection operation at this affiliated station, and after this certain period of time has elapsed, In the early dialing system that restricts calling from the central office line that connects this call path, if a dial is received from this extension telephone before this certain period of time has elapsed, the first dialing system that restricts the calling of this extension telephone from the central telephone If a dial is received from this extension telephone after the specified period of time has elapsed, the extension telephone is prohibited from making long-distance calls according to the regulation class for long-distance calls assigned to this extension telephone. Second to regulate
A central office line origination early dialing regulation system characterized by comprising a regulation means.