JPS5871758A - Ring-down incoming connecting system - Google Patents

Abstract

PURPOSE:To enable a ring-down incoming to connect to a prescribed extension group, by selecting an idle extension that is previously stored. CONSTITUTION:When a ring-down incoming trunk CICT has an incoming call, the incoming call is informed to a controller CONT via a scanning circuit TSCN. The controller CONT starts the monitor for the scanning point after identifying the incoming trunk is equal to the CICT. Then the call signal given to the trunk from a counter station is transmitted to the CONT via the TSCN. Thus the CONT identifies the incoming call to the CICT, and as a result, an indoor extension of the ring-down incoming enable extension groups which are stored previously in a storage device MM is selected. Then a call is executed through a call signal trunk RGT.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ringdown termination connection scheme in an electronic exchange.

Traditionally, the connection methods for receiving ringdown calls include a relay stand method and a method in which the extension responds when the incoming call lamp on the incoming call display box lights up. An object of the present invention is to provide a system that enables ring-down incoming calls to a predetermined group of extensions without using the above-mentioned special equipment. In an electronic exchange having an incoming call trunk, a calling register trunk, a calling signal trunk, a special tone sending trunk, a service trunk, a trunk scan circuit, a storage device for storing an extension to be called when a ring-down call arrives, and a control device for controlling them. The system is characterized in that when a ring-down call is received, an unoccupied extension is selected from a group of extensions stored in advance and the incoming call is connected to that extension. @jlI Figure 1 shows the relay system of the present invention, and Figure 2 shows the relay method of the 1st W.
An example circuit of the ring-down incoming trunk shown in J is shown. #
In Figure I1, A and B are 4 extensions, 8PDTFi special dial tone transmission trunk, SW is call path switch, and CIC.
Ringdown incoming trunk in invention, RGT
is a calling signal trunk, ORT is an originating register trunk, SVT is a service trunk, T8ON is a trunk scan circuit, C0NT is a control device, and MM is a storage device. When there is an incoming call on the ring-down incoming trunk CICT (earth on line A, -48 on line B, lil), the controller C0NT is notified of the incoming call via the trunk scan circuit T8ON. When this control device 1icONT identifies that the incoming trunk is a ringdown connection CICT, it starts monitoring the scan point. Next, when a game calling signal is sent to the B line of the trunk, this is notified to the control device C0NT via the trunk scan circuit T8ON.
When the NT identifies that there is an incoming call on the ring-down incoming trunk CICT, it selects an empty extension, for example, an extension person, from among the extensions that are pre-stored in the storage device MM and can receive ring-down calls, and calls it from the ringing signal trunk RGT.・When the extension person responds to this, a ring-down connection with the player station is entered into a call state via CICT. ◎If the player hears a call with another extension, the internal AImA will dial down 7 times. After connecting with the transmission register trunk ORT and hearing the special dial tone from the special dial tone sending trunk 8PDT,
Dial the other party's extension number/Call register trunk O
RT receives this number and sends it to control device C0NT.

The service trunk 8VT is used to call the other party @B, and a ringback tone RBT is sent to the other party @A. When the other party's extension B answers, a conversation is established between the extensions A and B via the service trunk 8VT.

After this, when the person on the forwarding extension hangs up the handset, the transferred extension B
and the other player enter into a conversation state via the ring-down trunk CICT. 〇Figure 2 shows the ring-down trunk CICT shown in Figure #I1.
This is a specific circuit diagram of ・When there is an incoming call from the station, the G relay operates and the switch (scan point) 8P is applied to the contact g.
10)) Notify the control device C0NT of the incoming call via the rank scan circuit T8ON. When the control device C0NT identifies that the incoming trunk is the ring-down trunk CICT, it starts monitoring the scan point) 8P10 (r contact). When there is a call signal for the next game, RO
The relay operates and notifies the control device C0NT of this signal detection through its contact γ. ◇The OA relay in the figure is a relay H that has the function of supplying call power to the extension line and monitoring the loop.
D is a ring-down incoming trunk holding relay, and E is a game monitoring relay.

As explained above, the present invention stores extensions that can receive ring-down calls in a storage device, and when a ring-down call arrives, selects and calls one of the extensions. You can receive down calls.

Table Brief Description of the Drawings - Figure 1 is a relay system diagram illustrating the incoming connection of the present invention;
The figure is a circuit diagram of the ringdown incoming trunk shown in Figure 1. ◇ A, B...Extension, 8PDT...Special tone transmission trunk, CICT...Ringdown Incoming trunk, RGT... Calling signal trunk, ORT... Outgoing register trunk, sv
'r=...Service trunk, T8CN-...
... Trunks middle Yang circuit, C0NT... 1 Figure 1: /(: T θRT SVT

Claims (1)

[Claims] In an electronic exchange having a ring-down incoming trunk, a calling register trunk, a calling signal trunk, a special tone sending trunk, a service trunk, a trunk scan circuit, a storage device that stores the extension to be called when a ring-down call arrives, and a control device that controls them. has
A ring-down call connection method that is characterized in that when a ring-down call is rarely received, an air extension is selected from a group of extensions stored in advance and the call is connected to that extension.