JPH04259157A - Transmission abort system - Google Patents

Abstract

PURPOSE:To restore the connection to a talking state automatically due to expiration of time after detection of a busy destination state with respect to the transfer abort system at call transfer in an electronic exchange. CONSTITUTION:The electronic exchange is provided with a call control section 4 controlling incoming and outgoing calls, an extension state management table 5 managing the operating state of an extension subscriber, a tone detector 6 detecting a tone from an external line subscriber, a timer processing section 7 processing a prescribed timing, and the call control section 4 is provided with a busy state detection means from the tone detector 6 or the extension state management table 5, a means starting the timer processing section 7, a means detecting timeout from the timer processing section 7 and a means informing a signal equivalent to a hooking signal at a transfer source, and when the talking call is transferred, after the busy destination is detected, the timer processing is started and the connection is restored to the holding party automatically due to timeout.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer abandonment method when a call is transferred during a call in an electronic exchange. 2. Description of the Related Art Conventional electronic switching systems provide a service for transferring a call in progress to a third party. In a PBX, when a subscriber of an extension telephone is talking with a subscriber of another extension telephone, a leased line subscriber, or a central office line subscriber, a subscriber of a third party's extension telephone, a private line subscriber, or a central office line subscriber is It is possible for the calling subscriber to keep the called subscriber waiting and talk to a third party subscriber, or for the called subscriber to make a call between the third party subscriber and the called subscriber. These call forwarding services are possible by either the originating subscriber or the terminating subscriber by hooking and dialing a third party's telephone number. However, if the third party is busy or absent, the originating subscriber or the terminating subscriber has to perform a hooking operation to return to the original conversation state. For this reason, the user is required to perform a hooking operation, and a simple automated method has been required.

0002

[Prior art] Conventional transfer abandonment method when the transfer destination is busy
The BX connection configuration diagram is shown in Figure 4. In the figure, 11 is a network, 12 is a central processing unit, 13 is a memory device, 1
4 is a call control unit, 15 is an extension status management table, and 16 is a tone detection device. A is the transfer source's extension phone, B is A
C indicates a telephone within the own exchange or outside the own exchange that is currently communicating with the caller, and C indicates a telephone within the own exchange or outside the own exchange that is the transfer destination.

[0003] There are two types of telephones that connect to a PBX: one is directly connected via an extension line, the other is connected from another PBX using a dedicated line, and the other is connected from a central office exchange using a central office line. Common line signaling method (
There are two types: digital signal) and individual line signal method (analog signal).When connecting using the extension method, the connection status is monitored using the extension status management table 15, and when connecting using the common line signal method, no telephone line is used. The connection status of the other party is monitored using the control channel, and in the case of the individual line signaling method, the tone detection device 16 detects the signal sound from the other party's communication line.
It is monitored by

[0004] In the conventional system, when extension telephone A is talking to telephone B and wants to transfer the call to a third party's telephone C, telephone A hooks the telephone and dials the number of telephone C, thereby transmitting hold tone to telephone B. At the same time, the telephone C
If phone A is not busy, phone C goes off-hook and phone A
If telephone A hooks in this state, telephone A and telephone B become able to communicate again, and telephone C is disconnected. Further, when telephone A and C are in a talking state, if telephone A goes on-hook, telephone B and C can talk. If phone B that is talking to phone A is an extension phone, hooking phone B and dialing the number to phone C will enable phone B and C to talk, and conversely, a hold tone will be sent to phone A. Ru. However, during a call between phone A and phone B, the third
When the call is transferred to the other party's telephone C, if telephone C is busy, telephone A and telephone B become able to talk again due to hooking of telephone A, and telephone C is disconnected.

[0005]

[Problems to be Solved by the Invention] Conventionally, when the transfer destination is busy, the transfer party returns to the original conversation state by performing a hooking operation after listening to the busy tone. However, since hooking operations were required, it caused unnecessary trouble for the user.

[0006] An object of the present invention is to improve convenience by automatically returning to the busy state by timeout after detecting that the transfer destination is busy.

[0007]

[Means for Solving the Problems] A diagram of the principle configuration of the present invention is shown in FIG. In the figure, 1 is a network, 2 is a central processing unit, 3 is a memory device, 4 is a call control unit, 5 is an extension status management table, 6 is a tone detection device, and 7 is a timer processing unit added in the present invention. . In addition, A is the extension telephone of the transfer source, B is a telephone outside the own exchange that is connected to A in the own exchange or by a dedicated line or central office line, and C is a telephone connected to the own exchange or private line or central office line of the transfer destination. Indicates a connected telephone outside the local exchange.

The call control section 4 includes means for detecting a busy state from the tone detection device 6 or the extension state management table 5, means for activating the timer processing section 7, and means for detecting a timeout from the timer processing section 7. and a means for notifying the hooking signal equivalent of the transfer source, and when transferring an active call, after detecting that the other party is busy, a timer process is activated, and the connection is automatically returned to the holding party upon timing out. Configure it as follows.

[0009]

[Operation] A processing flowchart of the present invention is shown in FIG. The figure shows processing flows for each case when the transfer destination telephone C is an extension telephone of the own exchange, when it is a trunk line/office line of the common line signaling system, and when it is a trunk line/office line of the individual line signaling system. (1) Start from a state where telephone A and telephone B are talking. (2) Hooking from phone A is detected. (3) Send hold tone to telephone B. A dial tone is connected to telephone A. (4) Receive the dialed digits of telephone C from telephone A. (5) In the case of a local extension, the state of telephone C is detected from the extension state management table 5. (6) In the case of common channel signaling, request the other party to connect telephone C. (7) Receive the status of telephone C from the partner station. (8) In the case of the individual line signaling system, the tone detection device 6 receives the tone from the other station. (9) In (5) to (8) above, when the transfer destination telephone C is busy (receiving busy tone), the call control unit 4 activates the timer processing unit 7 to perform a 4-second timing process. . (10) After taking a timing of 4 seconds, notify the call control unit 4 of the hooking signal equivalent of telephone A. (11) Connect telephone A and telephone B and return to a talking state. (12) In (5) to (8) above, when transfer destination telephone C is not busy (receiving ring tone), telephone A and telephone C are connected to enable a conversation. (13) Hooking from telephone A is detected. (14) Connect telephone A and telephone B to make a call in progress, and disconnect telephone C. (15) In the state of (12) above, disconnection of telephone A is detected. (16) Connect telephone B and telephone C to enable communication.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows an embodiment of a sequence diagram of call connection when the transfer destination is busy according to the present invention. In the figure, from (a) to (
e) indicates the connection status. (a) While telephone A and telephone B are talking, telephone A performs a hooking operation and the telephone number of transfer destination telephone C is dialed. (b) If telephone C is on an extension line or a trunk line/office line using the common line signaling method, telephone A listens to the busy tone of its own exchange, and telephone B listens to the hold tone of its own exchange, and immediately performs timer processing ( 4 seconds timing) is activated. (c) If telephone C is connected to an individual line signaling trunk/office line, telephone B listens to the hold tone from its own exchange, and telephone A listens to the busy tone from the other party's exchange. (d) After the tone detection device detects a busy tone from the other party's exchange, timer processing (4 seconds timing) is activated. (e) Thereafter, when the timer processing in (b) and (d) times out, the communication state between telephone A and telephone B returns.

Although the timer process is set at a timing of 4 seconds in the embodiment, it is possible to set an appropriate timing.

0012

[Effects of the Invention] As explained in detail above, according to the present invention, it is possible to return to the original call state without performing the conventional transfer abandonment operation (hooking), contributing to improved convenience for the user. There's a lot to do.

[Brief explanation of the drawing]

[Figure 1] Principle configuration diagram of the present invention

[Figure 2] Processing flowchart of the present invention

[Figure 3]
Example sequence diagram

[Figure 4] Connection configuration diagram of conventional example

[Explanation of symbols]

1,11 Network 2,12 Central processing unit 3,13 Memory device 4,14 Call control unit 5, 15 Extension status management table 6,16 Tone detection device 7 Timer processing section

Claims (1)

[Claims] Claim 1: In a transfer abandonment method when transferring calls in an electronic exchange, the electronic exchange includes a call control unit (4) that controls incoming and outgoing calls, and an extension status management table (5) that manages the usage status of extension subscribers. ), a tone detection device (6) that detects a tone from an outside line subscriber, and a timer processing section (7) that processes a certain timing, and the call control section (4).
) to the tone detection device (6) or extension status management table (
Busy state detection means from 5) and timer processing unit (7)
means for activating a timer processing unit (7), means for detecting a timeout from the timer processing unit (7), and means for notifying a hooking signal equivalent to a transfer source, when transferring a call in progress;
A transfer abandonment method characterized by starting a timer process after detecting that the other party is busy, and automatically returning to the connection with the holding party when the timing is out.