JP2825844B2 - Telephone exchange - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone exchange in which a plurality of telephones are connected, and each telephone can make a local line call.

2. Description of the Related Art Conventionally, when making a line call from a telephone connected in a conventional telephone exchange, when the station line is in full use, only a busy tone indicating that the line is in use is sent to the operator,
In this case, it was necessary to wait for a while and expect that the line was free, and start again.

Problems to be Solved by the Invention However, in such a method, there is no guarantee that the line is free even if the call is made again after a while, so if the line is used intensively, There were many inconveniences, such as having to redial and re-dial.

As a solution to this problem, all the extension telephones are provided with a first indicator light and a second indicator light which are ignited according to an instruction from the telephone exchange, and when a request for a central office transmission is generated from the extension telephone, the central office is provided with a telephone. If there is no available line, the first indicator of the extension telephone that made the call request is turned on, and then when the office line becomes free, the bell telephone is driven by the extension telephone that made the call request and the second There was an indicator that blinked to indicate that an office line was vacant, but in order to realize this function, all extension telephones must be provided with an indicator that blinks according to these operations. did not become. Furthermore, in order to distinguish whether the ringing tone is a normal incoming call or a notification that an extension has been vacated, it is necessary to check the indicator light provided on the extension telephone.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and has as its object to provide a telephone exchange which can confirm that an office line is free without providing an additional mechanism to a telephone and without confirming such as looking at an indicator light. I do.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention provides a method for transmitting an office line from an extension telephone, if there is no available office line, and informs the extension telephone of a normal busy tone. And a control unit for outputting a ringing tone different from a normal ringing tone to the extension telephone which has issued a request for a local line when a free line is generated.

Operation According to the above-described configuration of the present invention, the originator outputs a sound different from a normal busy tone or a ringing tone indicating that there is no vacancy in the office line or that an extension has been vacated.

Example Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a main configuration relating to the present invention in a telephone exchange.

100 is an extension telephone connected to the telephone exchange. 101
Is a calling signal generating means for ringing the extension telephone; 102 is a receiving means for receiving a dial from the extension telephone; 1
03 is hook detection means for detecting a hook state. 104
Is an extension interface unit and a calling signal generating means 10
1. It comprises a dial receiving means 102 and a hook detecting means 103, and has a terminal for connecting the extension telephone 100. Reference numeral 105 denotes a communication path switch unit, which realizes a call and outputs an audible tone by opening and closing the communication path. Reference numeral 106 denotes a station line capturing unit that captures a station line, and 107 denotes a dial dial transmitting unit that dials a station line. Reference numeral 108 denotes a station line interface unit, which is constituted by a station line capturing unit 106 and a dial transmitting unit 107. A control unit 109 performs the exchange control itself. The control unit includes the following units. Reference numeral 110 denotes extension state management means for managing the state of the extension telephone based on the result of the hook state detection means. 111 is a special number analyzing means, 112 is a transmission restriction analyzing means, 113 is a transmission digit number analyzing means, which analyzes the dial received by the dial transmitting means, and permits a local line transmission whether it is a special number or not. It is determined whether or not the number of digits to be transmitted to the office line has expired. Reference numeral 114 denotes a tone generating means for generating an audible tone and outputting the generated audible tone to the extension interface unit and the office line interface unit via the communication path switch unit. Reference numeral 115 denotes a station line state management unit that manages the state of the station line and provides an output to the station line acquisition unit. A storage unit 116 stores various control information necessary for control by the control unit, and stores a control program storage area PA and dial data according to the flowcharts shown in FIGS. 2 and 3. It has a storage area. A plurality of extension interface units 104 and a plurality of office line interface units 108 are connected to the communication line switch unit 105.
100 and multiple office lines are connected.

FIG. 2 is a flow chart showing a process of receiving and analyzing a dial transmitted from the extension telephone to an office line by the dial receiving means.

FIG. 3 is a flow chart showing a process when the station line in use becomes empty. The following description is based on the functional configuration diagram and flowchart.

When the extension telephone 100 dials, and the special number analyzing means 111 determines that the call originates from the local line, the extension telephone 1
In response to 00, a normal dial tone is output from the tone generating means 114. Thereafter, it is determined by the transmission restriction analyzing means 112 whether or not the outgoing line transmission dial to be received can be transmitted (step 201). If it cannot be determined yet, the process is terminated as it is. If transmission is not possible here, tone generating means 11
4 outputs a reorder tone indicating that station line transmission is impossible (step 202). If station line transmission is possible, the state of the station line managed by the station line state management means 115 is searched (step 203). If there is an office line, the office line is captured by the office line capture means 106, and the received office line transmission dial is transmitted by the dial transmission means 107 (steps 204 and 205). If there is no vacancy in the office line, dialing is continued to be received until the digit number analyzing means 113 determines that the digit number has expired (step 20).
6) When the number of digits expires, search for the state of the office line again (step 2)
07) If there is an empty local line, the local line is captured by the local line capturing means 106, and the received local line dial is dialed by the dial transmitting means 10
The call is transmitted by 7 (steps 204 and 205). At this time, if the office line is still empty, the number of the extension telephone 100 and the dial to be transmitted to the office line are stored in the dial data storage area in the storage unit 116 (step 208). A busy tone indicating that all the office lines are in use is output using the tone generating means 114 (step 209). This busy tone is different from a normal busy tone.

If the extension telephone 100 confirms this busy tone and goes on-hook, and then detects an empty office line by the office line state management means 115, the empty office line is reserved in step 307, and the extension having the office line transmission is used. It is determined whether there is a telephone (step 301). If there is, the extension telephone number is retrieved by the storage means 116, and after confirming that the extension state is empty by the extension state management means 110, the extension telephone 100 is ringed using the call signal generation means 101 (step 302,
303). The sound at this time is also different from the normal sound. When the extension telephone 100 responds to this call, in step 304 the empty line is captured by the local line capturing means 106, the previously received local line dial is retrieved from the storage means 116, and the dial is transmitted to the central line using the dial transmitting means 107. Place a call automatically. However, if the off-hook is not performed within a predetermined time even after ringing the extension telephone at step 303, the process proceeds from step 305 to step 306, where the reception dial is erased and the reservation for the office line transmission is canceled.

Advantageous Effects of the Invention The present invention provides notification means for notifying the extension telephone by a sound different from a normal busy tone to the extension telephone when there is no vacancy in the office line when the extension telephone requests the office line, and Control means for outputting a ring tone different from a normal ring tone to the extension telephone that has issued a request for a central office line when there is a vacancy in the office line. The system outputs a tone that is different from the normal busy tone or ring tone to indicate that a vacancy has been made, so that the caller can recognize that there is no vacancy in the extension or that a vacancy has occurred in the future, depending on the tone type. This eliminates the need for confirmation work such as viewing the indicator light provided on the extension telephone. In addition, since all are notified by sound, there is no need to provide an additional mechanism such as an indicator light on the extension telephone, and when expanding the extension telephone, it is necessary to purchase a telephone with a special mechanism, Therefore, there is no need to add a device for achieving an additional mechanism such as an indicator light.

[Brief description of the drawings]

FIG. 1 is a block diagram showing main functions of a telephone exchange according to an embodiment of the present invention, and FIG. 2 is a flowchart showing processing when a local line dial is received from an extension telephone in the embodiment. FIG. 3 is a flowchart showing the processing when the state of the station line becomes empty. 100: Extension telephone 101: Call signal generating means 102: Hook state detecting means 103: Dial receiving means 104: Extension interface unit 105: Normal road switch unit 106: Local line capturing unit 107: Dial reception Means 108 Office line interface unit 109 Control unit 110 Extension state management unit 111 Special number analysis unit 112 Transmission restriction analysis unit 113 Transmission digit number analysis unit 114 Tone generation unit 115 Office line state management means 116: storage unit

Claims (1)

(57) [Claims] 1. An extension interface unit connected to each extension to which an extension telephone is connected, an extension interface unit connected to each of a smaller number of extension lines than the number of extensions, and a connection to the extension interface unit. Hook state detecting means for detecting a hook state of an extension being set; station line state managing means for detecting an empty state of a station line via the station line interface unit; and a station from an extension connected to the extension interface unit. A tone for outputting a sound different from a normal busy tone to the extension when a line transmission request is made and the station line connected to the station line interface unit is determined by the station line state management means to be free. Generating means; calling signal generating means for outputting a calling signal to an extension via the extension interface unit; and When there is a line transmission request from the connected extension telephone, storage means for storing destination dial data transmitted following the line transmission request, and after outputting a different sound by the tone generation means, When it is detected by the office line state management means that an office line connected to the office line interface section is vacant, a normal ringing tone is given to the extension that issued the office line request to the ringing tone generating means. When a ring tone different from the above is output, and the hook state detecting means detects that the extension telephone that has requested the local line has gone off-hook, control is performed to capture a vacant local line. , For the captured office line,
Control means for controlling transmission of an office line in accordance with destination dial data stored in said storage means.