JP2766054B2 - Extension calling method - Google Patents

Description

The present invention relates to an extension calling system in a private branch exchange accommodating a plurality of extensions.

(B) Conventional technology The following system has been proposed as a conventional extension calling system in a private branch exchange accommodating a plurality of extensions.

In this extension calling method, a special number is given to each extension to identify the extension by a ringing tone, the calling extension gives a special number, the called extension is dialed, a ringback tone is received, and When a number for identifying is dialed, a ringing tone is transmitted to a called extension by a calling signal generating circuit in synchronization with a dial pulse of the number for identifying the self. A different bell ringing is performed for each call extension, and the caller can be identified.

This type of technique is described in detail in, for example, JP-A-63-119353.

(C) Problems to be Solved by the Invention However, in the above-described conventional extension calling system, the calling extension calls the called extension again after the called extension is busy or after the called extension does not answer. Sometimes it is possible to make the called extension recognize that it is a recall by assigning the above-mentioned recall to one of the numbers for identifying itself in advance. In addition to the number, it is necessary to dial a special number and a number for recognizing the self, and there is a problem that the operation is complicated for the caller. In addition, there is a problem that it takes time to complete the calling.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an extension paging method that allows a called extension to recognize a recall in a short time with easy operation.

(D) Means for Solving the Problems The present invention relates to an extension paging method in a private branch exchange accommodating a plurality of extensions, and when a called extension is received from a calling extension, the called extension is busy or unanswered. In the case of, there is provided storage means for storing information on the calling extension, and calling means for transmitting a plurality of types of ring tones to the called extension. An extension calling method characterized by selecting a ringing tone to be sent from the calling means to a called extension based on the contents of the extension.

(E) Function According to the present invention, a ring tone to be sent from the calling means to the called extension is selected based on the contents stored in the storage means when a call is received from the calling extension to the called extension. Therefore, if the calling extension wants to recognize that the called extension is recalling when the called extension recalls the called extension after the called extension is busy or the called extension is unanswered, the number of the called extension You only need to dial

(F) Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a private branch exchange for explaining an embodiment of the present invention.

In the figure, 1 is a communication path switch (SW), 2i, 2j, 2k
Is an extension housed in the call path switch 1, 3 is a control device (CC) that controls the entire system, 4 is a case where the called extension is busy or unanswered when a call is received from the calling extension to the called extension. ,
A storage device having a call extension storage area for storing information on call extensions, 5 is a first ring tone transmission trunk (IR) for sending a first call tone, and 6 is a second ring tone for sending. A second ringing tone transmitting trunk (SIR), 7 a busy tone transmitting trunk (BT) for transmitting a busy tone, 8 a ringback tone transmitting trunk (RBT) for transmitting a ringback tone, and 9 a time. A timer for counting, 10 is an extension circuit (LC), and 11 is a digit receiving unit (ORT). Note that the first ringing tone is used for calling a normal extension, the second ringing tone is used for recalling an extension, and the first ringing tone and the second ringing tone are easy for the user. Are chosen so that the difference is apparent.

FIG. 2 shows an example of the configuration of a call extension storage area of the storage device 4. One call extension is stored for each called extension (extensions 2i, 2j, 2k) when the extension is busy or unanswered. (Specifically, the extension number) is stored.

FIG. 3 is a state transition diagram of one embodiment of the present invention, and the upper left numeral of each state indicates a state number.

When the extension circuit 10 detects the off-hook of the extension 2j, the control device 3 connects the numeral receiving unit 11 to the extension 2j, and enters a numeral receiving state. When the extension number of the extension 2j dialed by the caller of the extension 2j is received (state 1), the control device 3
Checks whether the extension 2i is vacant. If not, the extension 2j is located at a position corresponding to the extension 2i in the call extension storage area of the storage device 4.
(Specifically, the extension number of the extension 2j), start the timer 9, connect the busy tone transmission trunk 7 to the extension 2j, and transmit the busy tone to the extension 2j (state 2 ).

When the extension 2i is empty, the control device 3 sets the extension 2j at a position corresponding to the extension 2i in the call extension storage area of the storage device 4.
It is checked whether or not the information of the extension 2j is stored. If the identification information of the extension 2j is not stored, the ringback tone transmission trunk 8 is connected to the extension 2j, and the ringback tone is transmitted to the extension 2j. Is connected to the first ringing tone transmission trunk 5, and the first ringing tone is transmitted to the extension 2i (state 3). On the other hand, if the identification information of the extension 2j is stored, the ringback tone transmission trunk 8 is connected to the extension 2j, the ringback tone is transmitted to the extension 2j, and the second ringing tone transmission trunk 6 is connected to the extension 2i. The connection is established, and the second ringing tone is transmitted to the extension 2i (state 5).

In the state 3, since the extension 2i does not respond, when the control device 3 detects the off-hook of the extension 2j by the extension circuit 10, the information of the extension 2i is stored in a location corresponding to the extension 2j in the calling extension storage area of the recording device 4. Then, the timer 9 is started and the extensions 2i and 2j are released (state 4).

In the above-described embodiment, the timer 9 is used to erase the stored contents of the call extension storage area after a certain period of time. In the state where the information is stored, when a call is newly made from the extension 2k to the busy extension 2i, the identification information of the extension 2k is superimposed and stored at a position corresponding to the extension 2i in the call extension storage area ( That is, overwriting may be performed.

In the above-described embodiment, the calling extension storage area of the storage device 4 stores, for each called extension (extension 2i, 2j, 2k), one calling extension when the extension is busy or unanswered. Is stored, but a plurality of calling extensions may be stored for each called extension.

Further, in the above-described embodiment, as the information of the calling extension,
Although only the number of the calling extension is stored, the number of times may be stored in addition to the number. This is applicable to both a configuration in which one call extension is stored and a configuration in which a plurality of call extensions are stored. In such a case, three or more types of ring tones are prepared, and a more detailed service can be provided by selecting the ring tones according to the number of times.

(G) Effects of the Invention As is apparent from the above description, the present invention provides a method for calling extension when the calling extension calls the called extension again after the called extension is busy or after the called extension does not answer. If the caller wants to recognize that the call is a recall, it is only necessary to dial the number of the called extension, so that the operation is simple for the caller and the effect that the time until the call ends is short. is there.

[Brief description of the drawings]

FIG. 1 is a block diagram of a private branch exchange for explaining an embodiment of the present invention, FIG. 2 is a diagram showing a configuration example of a call extension storage area of a storage device 4, and FIG. FIG. 6 is a state transition diagram of one embodiment. 1 ... Speaker switch (SW), 2i, 2j, 2k ... Extension, 3
... Control device (CC), 4... Storage device, 5... First ringing tone transmission trunk (IR), 6... Second ringing tone transmission trunk (SIR), 7. (BT), 8 ...
... Ring back tone transmission trunk (RBT), 9 ... Timer, 10 ... Extension circuit (LC), 11 ... Number receiving unit (OR
T).

Claims (2)

(57) [Claims] In an extension calling method in a private branch exchange accommodating a plurality of extensions, when a called extension is received from a calling extension and the called extension is busy or unanswered, information on the calling extension is transmitted. Storage means for storing, and a calling means for transmitting a plurality of types of ring tones to the called extension. When a call is received from the calling extension to the called extension, the calling means An extension calling method, wherein a ring tone transmitted from the calling means is selected for a call extension. 2. The extension calling system according to claim 1, wherein the information stored in said storage means is deleted after a predetermined time has elapsed.