JPH0555652U - Telephone exchange - Google Patents

Abstract

(57) [Abstract] [Purpose] In a telephone exchange having a function of exchanging an extension for a plurality of extensions with respect to one extension, a means for preventing the holding mode state of the extension from being unnecessarily prolonged. provide. [Structure] Therefore, the holding circuit 2 of the telephone exchange 20
A timer that turns on at the same time as the start of the hold mode setting operation is provided inside, and a hold melody is transmitted after a lapse of a predetermined short time t ₁ of this timer, and then a hold alarm sound is switched after a lapse of a predetermined time t _{2 of the} timer. , And then a predetermined time t ₃
After the lapse of time, the relay was configured to release this hold.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a telephone switchboard, and more particularly to a telephone switchboard having means for limiting the duration of its hold mode.

[0002]

[Prior Art]

 Conventionally, a hold circuit such as a PBX (Private Branch Exchange) telephone or a home telephone sets a hold mode when a hold operation by a user is detected, and outputs a hold alarm sound when this hold state continues for a predetermined time or longer. The hold mode is released by the user's subsequent operation.

[0003]

[Problems to be solved by the device]

 However, in practice, the longer the hold time, the user often forgets that he was previously held, and this may not be resolved when the hold alert is sent. .. If the hold time continues unnecessarily in this way, there is a problem that outside calls from the handset will be disabled during that time, and even if an important call is made to the outside line, it will be processed as "busy". As an example of this countermeasure method, for example, Japanese Patent Application Laid-Open No. 2-7757 discloses a telephone exchange with an automatic hold release function. However, the present invention provides a simpler solution in such cases. It is an object of the present invention to provide a means for preventing the holding mode from becoming longer than a predetermined time by limiting the sending time of the alarm sound and then releasing the holding mode.

[0004]

[Means for Solving the Problems]

 Therefore, in the present invention, in a telephone exchange having an outside line exchange function for a plurality of extension lines with respect to one outside line, after a holding alarm sound is sent out for a predetermined time when the outside line hold mode continues for a predetermined time, The object of the present invention is to be achieved by providing a releasing means for releasing the hold mode.

[0005]

[Action]

 The holding mode releasing means as described above prevents the holding state from being unnecessarily long for a predetermined time or longer.

[0006]

【Example】

 The present invention will be described below based on embodiments. FIG. 1 shows a schematic block diagram of an example of a telephone exchange in which the present invention is implemented. (Structure) In FIG. 1, 20 is a telephone exchange having the same basic structure as the conventional example, 1 is an incoming call detection circuit from one outside line (station line) 13, and 2 is a switch SW for receiving this incoming call. Holding circuit for performing the communication via DTMF receiver, 4 a doorphone circuit for a plurality of doorphones 15, 5 an extension current supply circuit, 6 an extension circuit, 7 a call detection circuit, 8 a call signal generation circuit Reference numeral 9 is a speaker amplifier circuit, 10 is a crosspoint switching circuit, 11 is a control circuit, and 12 is a power supply circuit. Further, 21 is a security telephone, 22 is a plurality of modular units with speakers, 23 is a plurality (only one is shown) of extension telephones, 24 is an answering machine, and 25 is a facsimile.

Here, the feature of this embodiment is that a timer (not shown) that starts counting at the same time as the start of the hold operation is provided in the hold circuit 2, and a predetermined small time t _{1 has} elapsed since the timer was turned on. After a lapse of time or on-hook, a hold melody is sent out, and after a predetermined time t _{2 of the} timer has elapsed, the sending of this hold melody is stopped and a hold alarm sound is switched to, and after a predetermined time t _{3 has} elapsed, a hold alarm sound It is configured such that the transmission of the signal is stopped and the holding line is released by releasing this hold by a relay (not shown).

(Operation) FIG. 2 shows a flowchart of the hold release sequence in the above configuration. In step S1, when the user performs a holding operation (hooking) for an incoming call from an outside line, the timer is turned on at the same time, and in step S2, after a predetermined small time t ₁ (for example, 20 seconds) of the timer has elapsed, or by an on-hook. The hold mode is set, and the hold melody is sent from the modular unit with speaker 22 in step S3. Next, in step S4, when the timer has passed a predetermined time t ₂ (for example, 4 minutes and 30 seconds), in step S5 the sending of the hold melody is stopped and a hold alarm sound (for example, 10 Hz modulated sound of 500/600 Hz) is issued instead. When the time t _{3 has} elapsed (for example, 30 seconds) in step S6, the sending of the hold alarm sound is stopped in step S7, and at the same time, the hold mode is released by using a relay (not shown) to open the capture line 13. To end the operation.

In the above embodiment, the case of the main device having the extension exchange function such as extension mutual communication and intercom communication is explained, but the extension exchange function is not limited to this case. Of course. The same applies to the setting of each predetermined time.

[0010]

[Effect of the device]

 As described above, according to the present invention, in order to prevent the user from forgetting the setting of the hold mode, after releasing the hold alarm sound for a predetermined time, the hold mode is released to open the outside line for capture. As a result, unnecessary holding time is prevented from being prolonged.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of an embodiment of a telephone exchange.

[FIG. 2] Hold release operation sequence flowchart

[Explanation of symbols]

 1 Incoming Call Detection Circuit 2 Hold Circuit 3 Call Detection Circuit 13 External Line 20 Telephone Switch 22 Modular with Speaker 23 Extension Telephone

Claims (1)

[Scope of utility model registration request] 1. In a telephone exchange having a function of exchanging a plurality of extension lines with respect to one outside line, when a hold mode of the outside line continues for a predetermined time, a hold alarm sound is transmitted for a predetermined time, and then the hold mode is released. A telephone exchange, characterized in that it is provided with a releasing means for operating.