JPS60259044A - System for controlling holding call - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides a hold call! 1 [Regarding the system, this paper specifically relates to a hold call control system for calls that are held on hold for an abnormally long time in a distributed control type digital exchange employing a microprocessor.

[Background of the invention]

Since conventional exchange terminals are analog telephones, trunks forming loop signals, etc., they use a so-called status maintenance type signaling system that allows the status of the terminal to be detected at any time. In this case, a CPU generated in a device W (hereinafter referred to as a subsystem 7) that is part of distributed control and includes a central control unit, storage device, and communication path device and performs switching processing.
Even if network services are interrupted due to a failure such as runaway, and there is a period when signals from terminals cannot be detected, network services can be immediately resumed by identifying the terminal status at the same time as recovery. In addition, even if the signal between the processors via the digital link is lost due to a failure in a distributed exchange such as a digital link between the processors, calls can be made because the terminal is a state-maintaining terminal (analog telephone). will not be held on hold for an abnormally long time. In contrast, when using a digital terminal that uses a digital transmission method to adapt to a variety of communication services,
Once the terminal fails to receive the pulse signal from the exchange, it becomes difficult to detect the condition, causing the call to be put on hold for an abnormally long time, resulting in erroneous billing.

[Purpose of the invention]

The purpose of the present invention is to solve such conventional problems by detecting and releasing calls that have been held for an abnormally long time due to signal loss during service interruption, etc., without the need for special hardware. The purpose of the present invention is to provide a hold call control method that allows for a hold call to be controlled.

[Summary of the invention]

In order to achieve the above object, the held call control method of the present invention includes:
In a communication network system in which a plurality of electronic exchanges are connected by a digital highway and each of the electronic exchanges accommodates terminal equipment via a transmission path, a detection means for detecting a long-term hold call in the electronic exchange. and - verification request means for requesting verification of the held call from the other party's electronic exchange;
recovery request means for requesting the other party's electronic exchange to restore the held call, and after the verification request means requests verification of the held call detected by the saturation detection means, from the recovery request means of the other party's electronic exchange; By receiving a recovery request for
The feature is that the detected held call is released.

[Embodiments of the invention]

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

FIG. 1 is a block diagram of the configuration of a distributed control electronic exchange illustrating an embodiment of the present invention, and FIGS. 2 and 3 are diagrams for explaining the operation in FIG. 1. In Fig. 1, the local switch subsystem (LS) 1 and 2 accommodate terminals such as subscribers and trunks, and are equipped with a central control unit, main memory, and communication paths, and have the functions of an independent exchange.
S.O.

'3 is a tandem switch subsystem (TSSO) that can connect multiple LSSs,
4.4' is the central control unit (CP), 5.5' is the main memory (MM), 6.6' is the time division switch (SW), 7,
7' is a digital highway, and 8 and 8' are subscribers.

When a call occurs on the OFF hook of the subscriber 8 in FIG. Y) is It
111C (empty) is rewritten to 1'0'' (in use) (see Figure 2; in Figure 2, black arrow 11 indicates data writing and white arrow 10 indicates data reading). When the call is terminated by the ON hook of caller 8, the time slot is released by the time slot release program stored in the main memory 5, and BSY in the time slot in use display 5-11 changes to tioppc, contrary to the above.
(in use) is rewritten to IILII (empty). Therefore, when no call is occurring, the BSY of time slot in use display 5-11 is always "1" (empty).
It is. However, if a failure occurs in the subsystem, even if a digital signal such as a disconnection signal sent by subscriber 8 or another subsystem arrives, it cannot be detected and the call is terminated. , the release of time slot in use display 5-11 remains. In order to prevent this, measures for detecting and restoring an abnormally long held call will be described below.

By activating the long-term hold call detection program 5-1 in the main storage device 5 at a relatively long cycle such as one hour, the negative value of BSY and the data (L L) of the time slot usage last look 5-12 are activated. Performs AND processing with the negative value of , and makes the result of the AND result the data (LONG) of long-term hold display 5-13, and at the same time, the content of BSY becomes the data of time slot use last look 5-12 (L L
) is performed. LONG and LL written in this operation are activated by the ON hook of subscriber 8 and released by the time slot release program 5-5, which releases the time slot, from 1'' (long pending) to 110, respectively. It (vacant) is rewritten from "o" (in use) to 1t-LnC (vacant).Therefore, LONG contains the long-held call detection program 5-1.
During the activation period, the call on hold can be set to It 1 zp (long time on hold) and used as an abnormally long held call. By activating the collation request signal sending program 5-3 that monitors the LONG at a relatively short cycle such as 1 second, the LONG is
When F+, matching request (RequestMatchin)
g 5tatus: RM S ) signal can be immediately sent to the LSSI accommodating the opposite subscriber 8'. LSSO is based on the information in the call control data 5'-11 of the main storage device 5', when the other party of the subscriber 8
He learns that he is being held in SI. The LSSI that has received the RMS signal uses the call status verification program 5'-1 to
Call control data 5'- indicates whether the call is actually on hold or not.
If the call is on hold, it will be considered a normal call and will not be answered, but if it is not on hold,
2LS as shown in Figure 3 as an abnormal held call.
Request a recovery request to SO.
ingCall: RRC) Returns the signal 8 R above
Upon receiving the RC signal, the LSSO activates the long-held call recovery program 5-2 in the main memory W5, and performs an RS C (Reset C1rquit) based on CCITT, Nα7 (common channel system), which is a protocol between exchanges. The held call is recovered by sending a signal and receiving a RL G (Release Guard) signal. In this way, l5
In the digitization of terminals through the introduction of DN, etc., abnormally long calls on hold can be detected and restored; i) Prevents abnormal hold on the network (communication channels, registers, etc.). ...) Release software sources such as call control data and time slot management data. ni) There are also effects such as 6 which prevents erroneous billing due to abnormal suspension.

〔Effect of the invention〕

As described above, according to the present invention, calls that have been held on hold for an abnormally long time due to signal loss during service interruption can be detected after a certain monitoring time without the need for special hardware. can be released.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the configuration of a distributed control electronic exchange showing an embodiment of the present invention, Fig. 2 is a diagram for explaining the processing operation of Fig. 1, and Fig. 3 is a call state mismatch in Fig. 1. This is an operation sequence chart of the time. 1...Local switch subsystem (LSS
O), 2...Local switch subsystem (L
SSl), 3...tandem switch subsystem (
TSSO), 4.4'-・Central control unit (CP), 5
．． 5'...Main memory (MM), 6.6'...Time division switch (SW), 7,7'...Digital high 7) ■ 3 Figure

Claims (1)

[Claims] In a communication network system in which a plurality of electronic exchanges are connected by a digital highway and each of the electronic exchanges accommodates terminal equipment via a transmission path, a detection means for detecting a long-term hold call in the electronic exchange. and a verification requesting means for requesting the other party's electronic exchange to verify the held call, and a recovery requesting means for requesting the other party's electronic exchange to restore the held call. A held call control system characterized in that a detected held call is released by receiving a restoration request from the restoration requesting means of the other party's electronic exchange after making a request by the verification requesting means.