JPS6028427B2 - Forced disconnection method for incoming calls and tandem stations - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a forced disconnection method when a called subscriber or line (hereinafter simply referred to as called subscriber) is encountered to be busy at a terminating or tandem station.

Accordingly, when the called party at the receiving station is busy, the receiving station searches the trunk accommodation position where the called party is captured from the called party accommodation position using the boosted voltage passed through the control line, and forcibly disconnects the trunk. There was a drawback that it had to be done.

The present invention is intended to solve such drawbacks, and in particular, stores the subscriber accommodation position in the forced disconnection storage device of the receiving station in correspondence with the accommodation position of the trunk that becomes busy, and when the called party is busy, the forced disconnection class is When the information is received, the trunk accommodation location is extracted from the subscriber accommodation location obtained by expanding the called party number from the storage device, thereby solving the above drawbacks.Forcible disconnection of the receiving station or tandem station The goal is to provide a method.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, it is assumed that the subscriber SUBB of the terminating station is talking to a subscriber of the originating station or another station via the communication path (3) and the trunk TRK.

In this state, when the calling party SUBA dials the called party number of the called party SUBB, he hears a busy tone because the called party SUBB is busy. When the calling party SUBA confirms the busy tone and hangs up the handset, he calls again for forced disconnection and dials the forced disconnection code and called party number, and the central control unit CC2 of the receiving station: Using the called party number received via the incoming trunk ICT and call switch SW2 at REO, the called party accommodation location is searched, the subscriber line scanning device BCN is activated, and the contact point of the L relay is used to locate the called party. Identify callee SUBB availability. When the called party SUBB is in the middle of a call on the communication path (■), the central control unit CC2 searches for a trunk accommodation position from the subscriber accommodation positions previously stored in the forced disconnection storage device PRIM based on the received forced disconnection class information, A forced disconnection warning sound WT is sent from the busy trunk TRK to the subscriber SUBB for a certain period of time via the communication path ■. Furthermore, after a certain period of time, the central controller CC2 activates the switch controller SWC2,
The communication path SW2 (■) of the called party SUBB and the busy trunk TRK is forcibly disconnected, and the communication path SW2 (■) of the called party SUBB and the incoming trunk ICT is connected to the busy trunk T.
Restore RK. Next, FIG. 2 shows a specific circuit of the forced disconnection storage device shown in FIG. 1, and the details thereof will be explained below.

In FIG. 2, the busy trunk storage location memory TRKT and the subscriber storage location memory SUBL of the forced disconnection storage device PRIM of the terminating station are designated with the busy trunk storage location and the subscriber storage location, respectively, and the memory address and write pulse , the busy trunk accommodation position and the subscriber accommodation position are respectively stored.
When the central control unit CC2 specifies the subscriber accommodation position read pulse, forced disconnection possible class pulse, called party busy pulse, and memory address, the subscriber accommodation position memory SUBL transfers the subscriber accommodation position to the matching circuit MATC. Output. The verification circuit MATC verifies the called party accommodating position specified by the central controller CC2 and the subscriber accommodating position each time the address is advanced, and if they match, sends memory address top information to the central controller CC2. do. When the central control unit CC2 stops advancing the memory address, the busy trunk accommodation position memory TRKT reads the busy trunk accommodation position using a logic mirror circuit using a busy trunk accommodation position read pulse specified by the central control unit CC2. AN
Output to DC. The logical product circuit ANDC reads the busy trunk accommodation position from the central control unit CC2 using the busy trunk accommodation position reading pulse designated by the central control unit CC2.
Send to 2. Therefore, when the trunk is restored, the busy trunk storage location memory TRKT and the subscriber storage location memory SUBL are designated with a clear pulse and a memory address from the central controller CC2, and the busy trunk storage location and subscriber location memory corresponding to the restored trunk are respectively designated. Release the person's accommodation position. In this way, the trunk to be forcibly disconnected is identified. Although one embodiment of the present invention has been described above using a receiving station as an example, it is also possible to apply the same to a tandem station.

[Brief explanation of drawings]

FIG. 1 is a relay system diagram showing a partial block diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of the forced disconnection storage device of the receiving station shown in FIG. SUBA...caller, OGT...outgoing trunk, S
UBB...Called party, L...Line relay, CN/
River subscriber line scanning device, REG... register, TRK/
・・Trunk, ICT...Incoming trunk, SW1, SW2
...Communication plane communication path, SWC1, SWC2...Switch control device, CC2...Central control device, PRIM...Forced disconnection storage device, WT...Forced disconnection warning sound, TRKT
...busy trunk accommodation location memory, SUBL...subscriber accommodation location memory, MATC...verification circuit, AND
C...Logic product circuit. Rare 1 figure N wave

Claims (1)

[Claims] 1. A forced disconnection storage device is installed at the receiving station or tandem station that connects incoming calls from class callers that can be forcibly disconnected when the called party is busy. When the forced disconnection class information and the called party number are stored in the storage device and received from the calling station, when the called party is encountered while the called party is busy, the trunk accommodation position is extracted from the storage device and a forced disconnection warning sound is sent out for a certain period of time. After that, the communication path between the called party and the trunk exchange is forcibly disconnected, and the communication path between the called party and the incoming trunk exchange is connected.