FI106183B - A method and system for detecting a held call on a telecommunications network - Google Patents

Description

106183

METHOD AND SYSTEM FOR DETECTING A CALL ON TELECOMMUNICATIONS

The present invention relates to a method as defined in the preamble of claim 1 and a system as defined in the preamble of claim 7 for detecting a held call to a terminal in a telecommunications network.

ISDN is a digital transmission system on a digital telephone network. The ISDN system 10 provides voice and data services to subscribers connected to the telephone network. There are two types of ISDN defined: Base Subscriber Line (BA) and Primary Rate Access (PRA). With a basic subscriber interface, a single terminal or a group of up to eight terminals can be connected to a public telephone network size 15, whereby up to two B-channel terminals can be active at the same time. It is also possible to connect a so-called basic or basic connection. ISDN Small Exchange (ISPBX, IS 20 Private Branch Exchange).

The standards define a variety of basic services, such as call transfer, call hold, call, call waiting, and so on, which are made available to the subscriber by special selection from his terminal or switchboard by the operator. When the ISDN subscriber puts a call on hold, the connection to the called subscriber is not disconnected, but remains open until subscriber A returns the call on hold. If the user does not return the call, it may remain on hold for a long time. Currently, no time control or other similar procedure is established for the call center to restore call hold.

On the other hand, terminals are known which store information about calls on hold, and no actual reminder from the 35 exchanges is required. However, there are terminals and applications that do not have this feature. As an example, there are applications that can be executed by a computer with »· · 2 106183 CAPI / PCI interface and may not have their own timers or hold controls. Generally speaking, there are many applications where traction control is required. In addition, you can visit; so that subscribers A and B put the same phone on hold. In the long run, switching between subscribers stays on for a very long time.

It is an object of the present invention to eliminate or at least significantly reduce the above problems.

In particular, it is an object of the present invention to provide a novel feature or feature that can be readily implemented in existing voice link centers and provides a useful additional feature to ISDN services.

As regards the features of the present invention, reference is made to the claims.

In the method of the present invention, a first message to put a call on hold is transmitted to detect a call on hold in a communication network, whereby the local exchange puts the call on hold in a predetermined manner. When a user of a terminal wants to resume a call hold, a second message is sent by the terminal to resume the hold and connect the terminal to the call on hold. The first and second messages are defined in the standard series 1.100 to 1.400 of ETSI ISDN Services. The telecommunication network includes 30 local exchanges implemented with ISDN capability.

In addition, an ISDN terminal that supports ISDN functions is connected to the local exchange.

According to the invention, a third message is sent from the local exchange to the terminal containing 35 information about the call on hold. Preferably, the moment of transmission of the third message is determined by the timeout that is initiated when the call is put on hold.

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Based on time control, the third message is repeatedly sent at predetermined intervals. The length of the slots can be changed so that the reminder is sent more often the longer the call is on hold.

5 It is also possible to send a reminder the rarer the longer the call is put on hold.

Further, an arrangement may be implemented in connection with the invention to monitor the number of notification messages transmitted and when the number exceeds a predetermined threshold, the call on hold is terminated. This additional feature could be implemented on a per-subscriber basis so that the subscriber can set a predetermined threshold for the number of notification messages sent, or the duration of the call, which may be 15 on hold. Thus, for example, in computer-implemented applications, monitoring can be conveniently set so that a call on hold does not "hang". When a call on hold is disconnected, a four-to-20 member message is sent from the local exchange to the terminal notifying the disconnected call.

Once the terminal has received the third message, it can convert the message contained in the message into a string or tone to be displayed on the terminal display, which is transmitted to the user through the handset. Other forms of expression may also be used.

In a preferred embodiment, an acknowledgment message containing information about a call on hold and / or on hold is sent to the first message. In this case, the call may be indicated only 30-half-subscriber number and the time of hold-asetushetkel method. In addition, a similar content can be sent. ' an acknowledgment message for the second message, wherein the acknowledgment message ma includes information about the held call and / or J hold reset.

An advantage of the invention over the prior art is that the user of the terminal receives periodic notification of a call on hold. In this case, the user can either disconnect the call itself to avoid additional costs or restore the hold. Furthermore, the invention prevents the occurrence of "hanging" calls.

The system of the present invention for detecting a hold call on a communication network includes means for transmitting first and second messages from a terminal to a local exchange. The means for transmitting the messages are implemented in the terminal and connected to the terminal user interface so that the terminal user can, if he wishes, send the messages in question.

According to the invention, the system comprises means for transmitting a third message from the local exchange to the terminal, the third message including notification of a call on hold. Preferably, the system also includes means for providing time control to the local exchange, whereby the transmission intervals of the third message and the number of transmitted messages 20 can be monitored. In this way, the additional function of the invention can be enhanced.

The invention will now be described, with reference to preferred embodiments, with reference to the accompanying drawing, in which: Figure 1 shows a preferred system according to the present invention; and Figure 2 shows a signal diagram of a preferred embodiment of the present invention.

The system shown in Figure 1 includes a local exchange LE and a terminal DE. The terminal DE is connected to the local exchange LE via a basic ISDN interface (2b + d). This type of subscription has two speech channels with a capacity of 54 kBit / s and a signaling channel D with a capacity of 16 kBit / s.

The terminal includes means 1 for transmitting the first and second messages to the local exchange LE. The devices are made using a known 106 106183 ankle and are obvious to those skilled in the art and are therefore not described in further detail herein. The telephone exchange includes means 2 for sending a third message. The third message is the notification of a hold call to be sent to the ISDN terminal 5 DE. In addition, the local exchange LE includes means 3 for arranging time monitoring. The implementation of the means 2 and 3 is also obvious to the person skilled in the art and is therefore not described in further detail herein.

A preferred example of the implementation of the method according to the invention is shown below with reference to Figure 2. Figure two shows the signaling between the terminal TE and the local exchange LE in the case of the present invention. Initially, call 15 is in active mode. When a user of a terminal wants to put a call on hold, he commands the terminal to send the first message. Here, the first message is a hold message according to the ISDN specifications that put the call on hold. The local exchange 20 acknowledges the call on hold message, which is a hold ack message according to ISDN specifications. This acknowledgment message can be used to send a text message to: "Call on hold 12:23, number <12345> or user

Kalle K ". After the call on hold message, a predetermined timeout is initiated. When the timeout is triggered, a third message is sent from the local exchange LE to the terminal. In this example, information is transmitted using" display "information from the network to the user. transmission of communications.

After the third message, the timeout is restarted immediately. If a property that changes the timeout duration and the number of repetitions is used, it shall be checked before the restart whether the duration needs to be changed or whether it was the last notification. In the case of the last notification, a call on hold is disconnected and a notification is sent to the terminal (not shown in Figure 2).

When the terminal user receives a third message converted to a "call 5 hold" message on the terminal TE display, the user may resume hold. In this case, he instructs the terminal TE to send another message to the local exchange LE. Here, the second message is a retrieve message according to the ISDN specifications. The local exchange acknowledges the message transmitted by the terminal with an ISDN message retrieve ack. A text message may be sent in connection with this acknowledgment message: "Call hold 12:28, number <12345>". Thereafter, the local exchange will terminate the timeout and return to the normal call active mode.

The invention is not limited only to the above exemplary embodiment, but many modifications are possible within the scope of the inventive idea defined by the claims.

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Claims (10)

A method for indicating a call which is parked in a telecommunications network belonging to a local exchange (LE) and a terminal equipment 5 (TE) which is connected to the local exchange, in which a procedure from the terminal equipment to the local exchange is sent a first message. If the caller is on the call end, and from the terminal equipment, a second message is sent about restoring the call parking and on the terminal equipment's connection to the call that is parked, characterized in that a third message is sent from the local exchange to the terminal equipment, which contains information about the call on hold. 15 2. A method according to claim 1, characterized in that a time control is started up, where the call is parked and because of the time control the third message is transmitted repeatedly at predetermined intervals. 20 Method according to claim 2, characterized in that the length of the intervals is varied. Method according to any of claims 1 to 3, characterized in that the amount of the sent message messages is checked and when the amount exceeds a predetermined limit value, the parked call is interrupted. 5. A method according to claim 4, characterized in that a fourth message is sent from the local exchange (LE) to the terminal equipment (TE). country, which announces the interrupted call. Method according to any of claims 1 to 5, characterized in that the third message is converted into a message to the terminal equipment screen and / or audio signals in the terminal equipment. 10 106183 Method according to any of claims 1 to 6, characterized in that on the first message, a receipt message is sent, which contains information about the call to be parked and / or about the parking. Method according to any of claims 1 to 7, characterized in that on the second message a receipt message is sent, which contains information about the call that has been parked and / or about restoring the parking. 9. System for indicating a call parked in a telecommunications network belonging to a local exchange (LE) and a terminal equipment (TE) connected to the local exchange, to which terminal equipment includes means (1) for transmitting of a first message on call parking and for sending a second message on restoring the call parking, characterized in that the local exchange hears means (2) for transmitting a third message, which third message contains information about the call that is parked. System according to claim 9, characterized in that the local exchange has means (3) for arranging a time control for the parked call. • * r