JPH01106552A - Main wire alternating method - Google Patents

Abstract

PURPOSE:To make an extension number of a called side private branch exchange directly connectable when no private line is available because all private lines are busy or a fault occurs by automatically transmitting the office number of the main wire registered in corresponding to the dial number of the private line and the called extension number dialed at the time of transmission by combining the numbers and selecting the extension of the called private branch exchange. CONSTITUTION:If a call is caught by an acquisition block because all routes are busy, etc., when a privated line is selected, the combination of the dial number upto the office number of a main wire subscriber which is previously registered in an expansion memory 5 in corresponding to the dial number of the private line and the called extension number recorded in a call information memory 6 at the time of dialing is extracted under the control of a central controller 7 and sent to a dial sending circuit 8. Then a vacant main wire is selected by sending the combination to a central telephone exchange from a central office line trunk 9 and, when the called private branch exchange is used by a dial-in call, the called extension telephone set is directly called through a public network without using the exchange. If the called extension telephone set is busy when the telephone set is called, a busy tone is sent to the calling telephone set from the central telephone exchange. Therefore, the called telephone set can be connected directly.

Description

[Detailed Description of the Invention] [Summary] Regarding a connection method of a private branch exchange that accommodates a private branch exchange and a central office line, when an extension subscriber of the private branch exchange makes an outgoing connection to an extension subscriber of the other party's private branch exchange through the private branch exchange. , the purpose of this is to connect directly to the extension number of the other party's private branch exchange by bypassing the central office line when the leased line to the other party's private branch exchange is busy, and when making a call to the private branch exchange, the private branch exchange When the leased line dial number and extension number of the other party are received from the subscriber, if the leased line is all busy or there is no empty leased line due to a failure, etc., the station of the central office line registered to support the leased line dial number A configuration in which a call is automatically made to a central office line by combining the number and the extension number of the other party dialed at the time of the call, and the extension of the other party's private branch exchange is selected.

[Industrial application field]

The present invention relates to a method for connecting a private branch exchange that accommodates private lines and central office lines.

In recent years, as the scale of private branch exchanges has expanded, an increasing number of companies nationwide are connecting multiple private branch exchanges with private branch exchanges using dedicated trunk lines to make dedicated line calls (toll dialing). At the same time, the number of accommodated subscribers, the number of leased lines, and the number of private branch exchanges increased, and the number of dialing numbers increased from 3 digits to 3 digits for leased lines.
Some large companies have started to require four-digit extension numbers.

Subscribers to these private branch exchanges can not only dial private lines but also dial public telephone numbers by subscribing to a central telephone office. There are three ways to connect to a subscriber housed in a private branch exchange from a public telephone office line.The first method is to use a switchboard to relay the information to the private branch exchange operator and connect to the extension subscriber. The third method is that each extension subscriber has a telephone number and is connected directly from the telephone office.The third method is that the subscriber selects a PBX extension number within the telephone office by dial-in and is connected. Therefore, if the leased line is busy on the leased line, it is possible to connect to the public line using the O outgoing dial, but in this case the subscriber has to dial again. For this reason, a method has been adopted that automatically detours to a public line, ie, a central office line, when the dedicated line is busy.

[Conventional technology]

Conventionally, when an extension subscriber of a private branch exchange makes an outgoing connection to an extension subscriber of the other party's private branch exchange, when the leased line to the other party's private branch exchange is all busy, the central office line is detoured to the extension of the other party's private branch exchange. The connection method is to select the route when dialing the leased line dial number, and when a block such as all calls on the route is reached, the line is detoured to the central office line and the central office line subscriber number registered in advance for the leased line dial number is sent. and is connected via a public network. In this case, 1 for the leased line dial number.
Only one central office line subscriber number can be associated, and the method of operation is to register the representative number of the other party's private branch exchange and have the exchange connect to the extension via the private branch exchange's switchboard.

A block diagram of a conventional private branch exchange on the calling side is shown in FIG. In the figure, when dialing the leased line dial number 707 of the other party's private branch exchange with a telephone, if the leased line is all busy, the office line representative corresponding to the leased line dial number 707 registered in advance in the deployment memory 5' Number 044-75
2-8111 is extracted by the central control unit 7, sent from the dial sending circuit 8 to the office line trunk 9, and selected as the office line.

A conventional method for connecting an incoming call using a central office line when a leased line is busy is shown in FIGS. 6(a) and 6(b). (a) shows a connection method via a telephone exchange using a representative number, and (b) shows a connection method to an individual telephone by direct inline. In Figure (a), if the switchboard is captured by the main number 044-752-8111, for example, the switchboard calls and connects the desired extension telephone B in response to the other party's response. In figure (b),
Telephone A is captured by a 16 Hz ring signal due to the calling number from the central office, for example 044-752-8114, and is not connected to extension telephone B, which does not have a central office number.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional incoming call connection method that bypasses the central office line when the leased line is all busy, if the other party's extension telephone is not subscribed to the central office line, direct automatic connection cannot be made, and the switchboard The only options were to make a relay connection or to make a call using an adjacent central office line direct telephone.

However, in recent years, incoming call connections using dial-in have been adopted, and it has become possible to connect directly to a PBX subscriber by specifying an extension number from a telephone office. That is, by capturing a private branch exchange with a central office subscriber number, for example 044-752-2400, the private branch exchange can directly call the subscriber with extension number 2400 by dialing 2400 sent from the central office exchange. Ta. The present invention proposes a method of directly connecting to an extension subscriber without going through a switchboard using this dial-in operation.

[Means for solving problems]

FIG. 1 shows a principle diagram of a transmitting station of a private branch exchange according to the present invention.

In the figure, 1 is a private branch exchange, 2 is a network, 3 is a calling register, 4 is a leased line trunk, 5 is an expanded memory,
6 is a call information memory, 7 is a solid control device, 8 is a dial sending circuit, and 9 is a central office line trunk. The present invention is provided with a memory 5 for extracting the central office number of the other party's private branch exchange by expanding the leased line dial number, and a call information memory 6 for storing the other party's extension number, and for dialing the extension telephone of the other party's private branch exchange. This system selects an in-line number and calls the central office line.

[Effect]

FIG. 2 shows a processing flowchart of the present invention.

When the extension subscriber of the private branch exchange dials the dedicated line dial number and extension number in order to call the other party's extension subscriber, the calling register 3 receives the dedicated line dial number and extension number, identifies the route, and calls the other party's extension subscriber. Select a service line. If there is a free ring line, the originating telephone is connected to the extension telephone of the other party's private branch exchange through a leased line trunk, but if the leased line selection results in a captured block such as a route conversation, the dedicated line is stored in the expansion memory 5. A combination of the dial number up to the station number of the station line subscriber number registered in advance for line dial number correspondence and the other party's extension number recorded at the time of dialing in the call information memory 6 is extracted under the control of the central controller 7. and sends it to the dial sending circuit 8, and sends it to the central office from the office line trunk 9 to select an empty line, and if the other party's private branch exchange performs dial-in operation, the extension telephone is immediately connected without going through the switchboard. can be called via the public network. At this time, if the other party's extension telephone is busy, a busy tone is sent from the central office to the originating telephone.

〔Example〕

Embodiments of the originating station and the terminating station of the private branch exchange of the present invention are shown in FIGS. 3 and 4. The terminating station indicates the status of dial-in connection from the central office. In Figure 3, if the other party's exclusive line dial number dialed by the calling station's extension telephone is 707 and the other party's extension number is 2400, the caller is 707-24.
Dial 00. The calling register 3 receives the leased line dial number 707 and the extension number 2400, identifies the route of the leased line, selects an empty line, and if there is an empty line, connects the calling telephone and the other party's extension telephone via the leased line trunk 4. Connect and make a call. At this time, if the leased line is all busy or there is no free line due to a failure, etc., the station number of the central office line subscriber number registered in advance in correspondence with the leased line dial number 707 stored at the time of dialing is stored in the expansion memory 5. 044-752 is extracted and combined with the extension number 2400 stored in the call information memory 6 in correspondence with the dialing station number, the dialing number 044-752-240 is sent from the dial sending circuit 8.
0 to the central office line through the central office line trunk 9 connected to the originating telephone, and if the central office line is not busy, the receiving telephone office is captured with 044-752, and the extension number 2400 is used to call the other party at the private branch exchange. Connects to a telephone and sends out a calling signal.

In FIG. 4, 10 is the LS on the terminating central office side, 11 is the network RNW on the terminating private branch exchange side, 12 is the ringing signal trunk ROT on the terminating central office side, 13 is the PB transmitter PBO3T on the terminating central office side, and 14 is the PB transmitter PBO3T on the terminating central office side. P on the receiving private branch exchange side
If the B receiving device is PBREC, the station number is 044-752.
LSI 0 of the telephone office captures the PB receiving device 14 on the private branch exchange side, and the extension number 2400 allows the LSI 0 of the telephone office to capture the PB receiving device 14 of the telephone office side.
2400 is sent from the transmitting device 13 to the PB receiving device 14, and when the private branch exchange side captures the extension telephone, a ringing signal of 15 Hz is sent to the extension telephone from the calling signal trunk 12 of the central office. If the telephone is busy, the central office sends a busy tone back to the originating telephone.

〔Effect of the invention〕

By using the method of the present invention, in the past, only one central office line number could be matched to the private line dial number even if the private line was detoured to the central office line when all the private lines were busy. By matching the numbers, you can connect directly to the other party's phone that you originally tried to call.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a processing flowchart of the present invention, FIG. 3 is an embodiment of the transmitting side of the present invention, FIG. 4 is an embodiment of the receiving side of the present invention, and FIG. The figure shows a block diagram of a conventional example on the calling side, and FIGS. 6(a) and 6(b) show a conventional example on the receiving side. In the figure, l is a private branch exchange, 2 is a network, 3 is a calling register, 4 is a leased line trunk, 5 is an expanded memory,
6 is a call information memory, 7 is a central control unit, 8 is a dial sending circuit, 9 is a central office line trunk, 10 is a central office LS, 11 is a receiving private branch exchange side network, 12 is a calling trunk,
Reference numeral 13 indicates a PB transmitting device (on the central office side), and 14 indicates a PB receiving device (on the private branch exchange side). Principle diagram of the present invention Figure 1 Processing flowchart of the present invention Figure 2 Figure 3 Figure 4 Block diagram of the sending side of the conventional example Figure 5 (a) Connection via switchboard method (b) Direct inline connection method 4 rows of night patients

Claims (1)

[Scope of Claims] Regarding a method for connecting a private branch exchange that accommodates a private line and a central office line, when a call is made from the private branch exchange (1) to the private line via a private line trunk (4), a calling register (3) registers an extension line. When receiving the leased line dial number and extension number from the other party, if the leased line is all busy or there is no empty leased line due to a failure, etc., register the leased line dial number correspondence in advance in the expansion memory (5). A number that is a combination of the station number of the central office line and the extension number of the other party stored in the call information memory (6) at the time of outgoing dialing is extracted and automatically sent to the central office line trunk (9) from the dial sending circuit (8). A central office line bypass method characterized by making a call and connecting to the extension number of the other party's private branch exchange in dial-in operation by bypassing the central office line.