JPH01220558A - Extension class switching system - Google Patents

Abstract

PURPOSE:To permit central office outgoing for an extension telephone set of central office outgoing prohibited class only for one time by permitting the central office outgoing only for one time at the time of issuing the request of the central office outgoing and returning a class to a preceding class automatically when a call is completed. CONSTITUTION:When the operator of an attendant board ATT5 depresses as K9, a key information transfer circuit INF6 sends key information to a central control unit CC7. The CC7 rewrites the extension class of an extension number (201) in a main memory device MM8 from the central office outgoing prohibited class PRH to a central office outgoing allowable class ALW transiently. Therefore, when a STA12 performs the central office outgoing in such state, the CC7, after capturing a free central office COT, for example, a COT41, sets a call pass between an LC22 and the COT41 by controlling an NW3, thereby, the STA12 is set at a state possible to perform the central office outgoing. When the call is completed, the CC7 obtains completion information from the LC22, and returns the extension class of the extension number (201) is the MM8 to the PRH. Namely, it means that the subscriber of the STA12 can be permitted to perform the central office outgoing only for one call.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an extension class switching method, and in particular, to switching the extension class of a calling extension telephone housed in an automatic private branch exchange from a class in which calls are not allowed to make central line calls to a class in which calls are allowed. Concerning extension class switching method.

[Conventional technology]

Conventionally, when a subscriber with an extension telephone housed in a private branch exchange that does not allow calls to the central office line wishes to be temporarily permitted to make calls to the central office line, the subscriber calls the operator at the central branch relay stand and asks for permission. The operator then operated the extension class switching key to rewrite the extension class of the extension telephone stored in the main memory to a class that permitted calls to the central office line.

Then, when the call made to the central office line was completed, the operator restored the extension class switching key to return the extension class of the extension telephone to the class in which calling from the central office line was not permitted. Note that, in general, an extension class switching key on a central office line relay stand is provided for each set (extension group) of a plurality of extension telephones.

[Problem to be solved by the invention]

In the conventional extension class switching method described above, the extension class of a subscriber who wishes to change the extension class is switched based on the on/off information of the extension class switching key on the central office relay board. In addition, in order to switch the class for each extension subscriber, it is necessary to provide the same number of extension class switching keys as the number of extension telephones that are not allowed to make central line calls. There are drawbacks.

[Means to solve the problem]

In the extension class switching method of the present invention, the central office line relay board uses a switching key to switch the extension class of an extension telephone that is not permitted to make central line calls to a class that allows central line calling, and transfers switching information from this switching key to the private automatic branch exchange. and a transfer circuit, when the central control device of the private branch exchange receives the switching information from the switching key, it temporarily allows the extension class of the extension telephone stored in the main storage device to make a call to the central office line. The present invention is characterized in that it includes a processing means for changing the class and permitting the extension telephone to make a central office line call only once.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the extension class switching method of the present invention, and FIG. 2 is a diagram showing an example of the contents of the extension class stored in the main storage device in FIG. 1.

In Figure 1, extension telephone i (hereinafter referred to as 5TA) 11.12
．． ~1n are subscriber circuits (hereinafter referred to as LC) 21.22
．． Switch network (hereinafter referred to as NW) 3 via ~2n
NW3 is accommodated in the central office line trunk circuit (hereinafter referred to as C0T
)41. A central office line is connected through .about.41. A central controller (hereinafter referred to as CC) 7 executes a control program stored in a main memory device (hereinafter referred to as MM) 8 to control the LCs 21 and 22.
~2n, NW3, and receives switching information of the extension class switching telephone key (hereinafter referred to as "K") of the central line relay board (hereinafter referred to as ATT) 5 via a switching information transfer circuit (hereinafter referred to as INF) 6 and performs predetermined processing. Let's do it.

Next, the operation of this embodiment will be explained.

As shown in FIG. 2, 5TALL, 12. in's extension numbers '200J and r201' respectively.

r299. Assume that the extension class of 5TAII and 1n is the local line calling permitted class (hereinafter referred to as ALW), and the extension class of 5TA12 is the local line calling not permitted class (hereinafter referred to as PRH).Here, 5TA12 goes off-hook. When dialing a central office line (for example, dialing r□), CC7 reads the extension class PRH of extension number "201" from MM8 by a generally known operation.
Do not capture free COT (LC22 to 5TA12
to send out a special sound. If the subscriber of the 5TA 12 desires permission to make a call to the central office line, the subscriber calls the ATT 5 using a known method and informs the operator of the request. When the operator presses the key 9 (non-lock), the INF 6 sends this telephone key information to the CC 7. CC7 temporarily rewrites the extension class of extension number r201J in MMS from PRH to ALW. Therefore, if 5TA12 makes a call to the central office line in this state, CC7 will capture a vacant C0T (for example, C0T41) and then
3 to set a call path between Lc22 and C0741, 5TA12 can make calls originating from the central office line. When this call ends, CC7 obtains this end-of-call information from LC22 and changes the extension class of extension number r201J in MMS back to PRH. In other words, the subscriber of 5TA12 is allowed to make only one call to the central office line. become.

〔Effect of the invention〕

As explained above, in the present invention, normally, when it is desired to make a call to a central office line from an extension telephone that is in a class in which calls are not permitted to be made to a central office line, the extension class of the calling extension telephone is temporarily switched to a class in which calls are permitted to be made to a central office line. By allowing a call to a central office line only once when there is a request to make a call, and automatically returning to the previous class when the call ends, the operator of the central office line relay stand can press the extension class switching key once. Simply pressing the button has the effect of allowing one call to be made to any extension telephone in any class that is not permitted to make calls to the office line.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing an embodiment of the extension class switching method of the present invention, and FIG. 2 is a diagram showing an example of the extension class storage contents of the main storage device in FIG. 1. . 11, 12. ~1 n-...extension telephone (STA),
21.22. ~2n... Subscriber circuit (LC), 3...
・Switch network (NW), 41, ~41...
・Central line trunk circuit (COT), 5...Central line relay board (
ATT), 6...Electronic key information transfer circuit (INF), 7.
...Central control unit (CC), 8...Main memory (MM)
), 9... Extension class switching key (K).

Claims (1)

[Claims] The office line relay stand is equipped with a switching key that switches the extension class of an extension telephone that is not allowed to make calls to the office line to a class that allows calls to the office line, and a transfer circuit that transfers switching information from the switching key to the automatic branch exchange. When the central control unit of the exchange receives the switching information from the switching key, it temporarily changes the extension class of the extension telephone stored in the main memory to a central office line call permission class and sends the extension telephone once to the extension telephone. An extension class switching method characterized by comprising a processing means for permitting only a central office line call to be made.