KR950023137A - Direct call control method of private exchange system - Google Patents

Abstract

Direct Inward Dialing (DID) control method of private switching system, especially when DID incoming call when the external subscriber calls a specific extension, the call can be connected even if the corresponding subscriber is busy, Even if an extension is transmitted insufficiently, the system provides a DID call control method for controlling an internal call by supplementing it internally. In the DID call control method, a digit receiving process for receiving a digit for an extension subscriber call transmitted from the DID trunk line in response to an incoming call of a DID trunk line, converting the received digit into a call number of an extension subscriber, and converting An incoming call sending process for sending an incoming call to an extension subscriber corresponding to the digit, and a call path forming process for establishing a call path between the subscribers of a DID call when the corresponding subscriber is answered to the incoming call. .

Description

Extension Direct Call Control Method in Private Switching System

Since this is an open matter, no full text was included.

2 is a block diagram of a private exchange system for carrying out the present invention;

3 is a flowchart of a method for direct extension call control of a private exchange system according to the present invention, showing a first embodiment;

Claims (4)

A direct telephone call control method of a private switching system connected to a DID trunk line of a local exchange, comprising: a digit receiving process of receiving a digit for an extension subscriber call transmitted from the DID trunk line in response to an incoming call of a DID trunk line; Is a call number of an extension subscriber, and an incoming call transmission process of transmitting an incoming call to an extension subscriber corresponding to the converted digit; and when the corresponding extension subscriber responds to the incoming call, a trunk line subscription of a called subscriber and a DID is received. An extension direct call control method of a private exchange system, characterized in that the process of forming a communication path to form a communication path between. 2. The private exchange system of claim 1, wherein the digit receiving process further comprises a step of searching whether a digit for calling an extension number is received by comparing a digit of a preset digit with a digit of a received digit. How to control an extension direct call. 3. The method of claim 2, wherein the incoming call transmission process comprises: converting a digit from a table in which a called party digit preset in a predetermined storage area is stored, and a digit number of the called party corresponding to the received digit number is stored; And an incoming call sending step of sending an incoming call to an extension subscriber corresponding to the converted digit. An extension direct call control method of a private switching system connected to a DID trunk line of a national exchange, comprising: a call receiving a digit for an extension subscriber call transmitted from the DID trunk line in response to an incoming call of a DID trunk line to retrieve a state of the called party; The subscriber call status search process, a subscriber class status search query for searching whether the called party is a callable subscriber in response to the called party being busy, and determining that the called party is a callable subscriber Characterized in that it comprises a call-route process for transmitting an off-hook tone, holding a counterpart subscriber in a call in response to an input of a call waiting message, and connecting the DID incoming call path to the called subscriber to form a call path. Extension Direct Call Control Method of Private Switching System. ※ Note: The disclosure is based on the initial application.