JPS62171366A - Relay line incoming connection system - Google Patents

Abstract

PURPOSE:To allow a calling subscriber to try relay line incoming to another called subscriber without breaking a connection by sending out a dial tone after sending out a busy-back tone for a certain time while holding an incoming register when the 1st called subscriber is busy, and receiving the 2nd called subscriber number. CONSTITUTION:When an incoming call from a trunk line is connected to a relay line trunk TIE 3, a central processing unit CPU 1 controls a network SWN 2 to connect the TIE 3 to the incoming register IR 6. The IR 6 sends back the dial toner DT to urge the calling subscriber to dial a called subscriber number. When the IR 6 receives and counts the called subscriber number 7 and transfers the result to the CPU 1, the CPU 1 checks whether the called subscriber 7 is free or not through a line circuit LC 4 and if the called subscriber is busy, the CPU 1 sends an instruction to the IR 6 to sends BT to the calling subscriber through the SWN 2 and TIE 3, thereby informing the calling subscriber of the busy state. The CPU 1 stops the IR 6 from sending the busy-back tone BT a certain time later and instructs the retransmission of the DT. The calling subscriber after hearing the DT dials the 2ND called subscriber number 8.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a trunk line termination connection system.

1. Prior Art 1 Conventionally, this type of trunk line incoming connection system has been used to immediately release the entry register when the called subscriber is busy, connect to the busy tone trunk, and provide the calling party with the busy tone. was sent to notify that the called party was busy.

[Problem that the invention seeks to solve]

In the conventional trunk line termination connection method described above, when a first called subscriber is busy and tries to call a second called subscriber accommodated in the same exchange, the calling party goes on-hook once, and
Then I had to call again. However, because the number of trunk lines is generally extremely small for economic reasons, it is difficult to acquire trunk lines during peak hours. Therefore, in order to call a desired called subscriber, the trunk line originating connection must be made many times.4 [Means for solving the problem] The trunk line terminating connection method of the present invention automatically In a telephone exchange, when a trunk line incoming call is connected, when the first called subscriber is busy, a busy tone is sent to the caller for a certain period of time, and then a dial tone is sent from the caller. A second called subscriber power number register is set up (III).

[One example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the trunk line termination connection system of the present invention.

In the same figure, the automatic telephone exchange has a central processing unit (hereinafter referred to as CPU) 1 that controls the overall sequence control, Sui Sosenne Sotowork (hereinafter referred to as 5WN) 2, and a trunk line (hereinafter referred to as 5WN) connected to the trunk line. TI E>3, line circuit (hereinafter referred to as LC) 4.5, and a large register (hereinafter referred to as "IR") that counts the called subscriber number of a call that arrives at 'T' I E3.
6, and LCs 4 and 5 have called subscribers 7 and 8, respectively.
is connected. Under the control of CPU 1, IR6 outputs a dial tone (hereinafter referred to as DT) and a busy tone (hereinafter referred to as BT) to the calling party.
) is also sent.

Next, the operation of this embodiment will be explained.

When an incoming call from a trunk line is connected to TIE3, CPU1 controls 5WN2 to transmit TIE3, as is generally known.
Connect E3 to IR6. IR6 returns a DT prompting the caller to dial the called party number. When the IR 6 counts the reception of this called subscriber number (here, the number of the first called subscriber 7) and transfers it to the CPU l, the C
P LJ 1 checks the availability of called subscriber 7 via LC4.

Now, when the called subscriber 7 is busy, the deviation is ('-F
'U1 instructs IR6 to 5wN2. "r'tE'
3 to the calling party so that the calling party knows that the called party 7 is busy.

After a certain period of time has elapsed, the CPUI instructs the IR 6 to stop transmitting BT and to retransmit D'F.

After the calling party hears this DT, when he dials the second called party number (in this case the number of called party 8), CP Ll 1 dials this called party number transferred from IR6. The called subscriber 8 is checked for availability, and if the called subscriber 8 is free, a known incoming connection to the called subscriber 8 is made.

[Effects of the Invention] As explained above, the present invention is capable of emitting a busy tone for a certain period of time while holding the incoming register while the first called subscriber is busy during an incoming call connection on a trunk line. by transmitting and then transmitting a dial tone and receiving a tone from a second called subscriber number, the caller who made the trunk origination connection can reconnect to the called subscriber number without disconnecting. This has the effect of making it possible to try to receive a call through a trunk line.

[Brief explanation of drawings]

The first is a block diagram showing an embodiment of the trunk line termination connection method of the present invention. 1...Central processing unit (CPU), 2...
・Switch network I network (SWN), 3...
Trunk line trunk (TIE), 4.5... Line circuit (LC), 6... Input register (IR), 7.
8. Song/Called subscriber. \, 72' Figure 1

Claims (1)

[Claims] In an automatic telephone exchange, when a trunk line incoming call is connected, a busy tone is sent to the caller for a certain period of time while the first called subscriber is on hold, and then a dial tone is sent out to make the call. 1. A trunk line termination connection system comprising an input register capable of receiving a number of a second called subscriber from a subscriber.