KR100247193B1 - Method of connecting reservation call in exchange system - Google Patents

Abstract

The present invention provides a call tone of a caller subscribed to a first exchange when a telephone of a callee subscribed to a second exchange is busy to enable a call reservation call between subscribers subscribed to different exchanges. Providing the telephone with the telephone, registering the reservation attempt message when the telephone is called through the caller's telephone, and requesting availability from the second exchange; Providing a ring signal to the caller's telephone in response to a reservation execution message applied through the second exchange when the caller ends the call; and when the caller's telephone is hooked off, the called party After the ring signal is also provided to the telephone of the step of canceling the reservation registration and establishing a call path between subscribers It features.

Description

How to perform reserved call at exchange

The present invention relates to a call connection method of an exchange system, and more particularly to a method of performing a reservation call that can perform a call reservation call between subscribers subscribed to different exchanges.

Typically, a switching system is connected to a plurality of subscriber telephones to provide call exchange service between subscribers. This switching system is connected to another switching system with multiple subscribers through multiplexed trunks. In a typical exchange system, a reserved call function is provided for the expansion of services. However, this function is useful only between subscribers subscribed to any same exchange and not between subscribers subscribed to other exchanges. That is, for example, if a subscriber subscribed to an exchange exchanges a call to a subscriber subscribed to another exchange, if the callee's phone belonging to another exchange is busy, the subscriber cannot dial out and dial the telephone number of the callee from time to time. It was. Thus, this is cumbersome for the caller.

Accordingly, an object of the present invention is to provide a method for enabling a call reservation call between subscribers subscribed to different exchanges.

Another object of the present invention is to provide a method of increasing the achievement rate of a call and providing the user's convenience more optimally.

In order to achieve the above object, the present invention provides a call tone to the telephone of the caller subscribed to the first exchange when the telephone of the called party subscribed to the second exchange is busy, and through the telephone of the caller. Registering when a reservation attempt message is received and requesting availability to the second exchange; receiving a reservation reception message when the reservation is available through the second exchange; and upon termination of the call by the called party; Providing a ring signal to the caller's telephone in response to a reservation execution message applied through a second exchange, and when the caller's telephone is hooked off, providing a ring signal to the called party's telephone, and registering the reservation. It is characterized in that it has a step of releasing and establishing a call path between subscribers.

Other objects and advantages of the invention will be apparent from the following description taken in conjunction with the accompanying drawings.

1 is an apparatus block diagram of an exchanger applied to the present invention.

2 and 3 are message flow diagrams of performing a reserved call at an exchange in accordance with the present invention;

In order to be able to make a call reservation call between subscribers subscribed to different exchanges, a preferred embodiment of the present invention for a method of performing a reserve call at an exchange is described in detail.

1 is an apparatus block diagram of an exchange system according to the present invention, in which the first and second exchange systems 10 and 11 connected to each other through a multiplexed trunk L1 have a plurality of subscribers 20, 21, 23 and 25, respectively. When a caller of any subscriber telephone 20 attempts to speak with a called party of called telephone 23 subscribed to another switch 11, if the telephone 23 is already busy or hooked off, a call is currently between the caller and the called party. Could not be done. In this case, the caller registers the reserved call through the switching system 10. To this end, the exchange system 10, 11 is responsible for the central processing unit, each consisting of a microprocessor, etc., the memory, the tone generator, the ring generator, the DTMF generator, DTMF transmitter, subscriber connection, and switching It usually has a switching unit. Get it. The ROM in the memory is a memory in which the control program of the CPU is stored, and the RAM is a working memory. The central processing unit generally controls the call setting operation in the exchange system according to a preset program, and performs the reserved call flow procedure according to the technical idea of the present invention in response to a user's key input.

2 and 3 are message flow diagrams for performing a reserved call at an exchange according to the present invention, and are shown in steps 30 to 38. FIG. The above control flow is performed as the call subscriber enters a specific function key. The specific function key may be set as a numeric key or a function key or a combination of numeric and function keys on the keypad of the telephone. In this embodiment, " hook flash + 21 " is set by the user digits. Here, the hook flash refers to the user pressing the hook switch on his or her phone more than once within a few seconds. Step 30 of Fig. 2 is performed by the first switching system 10 as a call connection attempt message FCS, for example, when there is a dialing through the calling subscriber's telephone 20, the telephone number digitized to the second switching system 11 through the trunk L1. Means to transmit. The second switching system 11 that receives this determines that the called party of the telephone 23 is already in a busy state, and in step 31 the first switching system sends a message RSB indicating that the called party is busy. Send to 10. Receiving this, the first switching system 10 provides the caller's telephone 20 with a ring tone or busy tone. The caller who hears this presses "hook flash + 21" via the keypad on his or her telephone for the purpose of attempting a scheduled call. Accordingly, when the reservation exchange message is received through the caller's telephone, the first switching system 10 registers it as a reservation table in the internal memory area and requests whether the second switching system 111 can make a reservation through step 32. do. When the second switching system 11 is available for reservation, the reservation exchange message is sent in step 33, and the first switching system 10 receives it. This completes the registration of the reservation for the call call. Thereafter, the steps of FIG. 3 are performed when the call is terminated.

In FIG. 3, when the caller ends the call, the second exchange system 11 transmits a reservation execution message in step 34. The first switching system 10 receives this and provides a ring signal to the caller's telephone. When the caller hooks up his / her phone at this time, the call connection of step 35 is attempted. In step 35, the first switching system 10 transmits the telephone number of the called party by referring to the table area, and the second switching system 11 which receives the call provides the ring signal to the called party. After providing the ring signal, the second switching system 11 sends a call connection ok message to the first switching system 10 in step 36. When step 37 is performed when the called party hooks off, a call path is established between two subscribers and a reserved call is made.

Therefore, the user can automatically receive a call reservation service by pressing only a specific key.

As described above, the embodiment of the present invention has been described with respect to being able to make a call reservation call between subscribers subscribed to different exchanges, but it is a matter of course that various changes and modifications are possible. For example, one manipulation of a particular key may be considered.

According to the method of the present invention described above, there is an advantage that can optimally provide call reservation calls between subscribers subscribed to different exchanges.

Claims (2)

A method of connecting a reserved call at an exchange, comprising: providing a busy tone to a telephone of a caller subscribed to a first exchange when a telephone of a called party subscribed to a second exchange is busy; Registering when a challenge message is received and requesting availability to the second exchange, receiving a reservation reception message when the reservation is available through the second exchange, and upon termination of the call by the called party; 2 providing a ring signal to the caller's telephone in response to a reservation execution message applied through the exchange; and upon ringing off the caller's telephone, providing a ring signal to the called party's telephone, And setting a step. A method of performing a reserved call at an exchange connected through a multiplexed trunk, the method comprising: providing a busy tone to a telephone of a caller subscribed to a first exchange when a telephone of a called party subscribed to a second exchange is busy; Registering when a reservation attempt message is received through the telephone of the requesting device and requesting availability to the second exchange, receiving a reservation reception message when the reservation is available through the second exchange, and calling the callee. Providing a ring signal to the caller's telephone in response to the reservation execution message applied through the second exchange at the end of the call, and providing a ring signal to the called party's telephone when the caller's telephone is hooked off. And then releasing the reservation registration and establishing a call path between subscribers.

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