JP3026627B2 - How to prevent invalid billing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to providing a network service via a telephone network, and more particularly to a network system in which a plurality of terminals are respectively connected to the telephone network and the network system. The present invention relates to a technology for preventing invalid charging in system connection.

[0002]

2. Description of the Related Art Conventionally, a network system receives an incoming call from a telephone network accommodating terminal in accordance with a V.25 system. Accepted by 25bis interface. V. 25. bis is CCITT
And is recommended by V. Using the 24-100 series interface, automatic dialing by character code control and automatic incoming call response are performed. V. 24 is a network unit (hereinafter, referred to as a network unit).
NU) and a modem (hereinafter referred to as DCE), which defines the interconnection circuit and its operating conditions.
In this method, it is a signal line between NU and DCE.

[0003] The meaning of the signal lines necessary for the description of this method will be described below.

[0004] CS (circuit 106): The DCE turns on this circuit (ON), indicating that it is ready to receive data from the NU.

[0005] DR (circuit 107): The DCE turns on this circuit (ON), and indicates that the control signal for data transfer with the NU is ready to be exchanged.

ER (circuit 108/2): When the NU is ready for data transmission / reception, the ER must always be turned on. Also, when the ER is turned on, the DCE must prepare the circuit and maintain the state after connection. When the ER is off, the DCE releases the line.

[0007] CI (circuit 125): When ER is on, it indicates that a calling signal (Incoming Ring) is being received.

FIG. 7 shows a schematic configuration of a conventional network system and its sequence. In the conventional method, FIG.
As shown in (2), when the CI (circuit 125) from the second DCE 4 is turned on, the NU 5 of the network system 6 receives a call from the terminal A (telephone network accommodation terminal) 1 accommodated via the telephone network 2. Ringing signal (Incoming
Ring) is detected and the ER (circuit 108/2) is turned on to notify that data transmission preparation is completed. The second DCE 4 performs an incoming call notification by an INC command. The NU 5 receives the incoming call notification, and the terminal B (the other terminal) 8
Make a call to. After transmitting the INC command, the second DCE 4 turns off the CI and CS, and after off-hook (in response to the telephone network 102, the start of charging), responds to the first DCE 3 on the calling side with an answer tone and DR.
(Circuit 107) is turned on to complete the connection. NU5 completes the connection by an acknowledgment from terminal B8.

[0009]

However, in the prior art, as shown in FIG. 8, when the network system 6 detects a call signal from a call from the terminal A1, and transmits a connection request to the terminal B8 after going off-hook. If the response from the terminal B8 is negative, the connection is stopped and the terminal goes on-hook. There has been a problem in that the telephone network 2 is charged (invalid charging) even though no communication is performed during this time. Here, invalid billing means that the terminal does not perform the intended data communication,
Telephone charges are charged.

To prevent invalid charging, it is necessary to go off-hook after synchronizing with the terminal B8. In a method utilizing this, there is a method of delaying the ON (ON) of the ER as shown in FIG.

[0011] This method has a problem when a call collision occurs. This example is shown in FIG. 10 (explanatory diagram of a general method for giving priority to the calling of the terminal A1). In this example, the call from the terminal B8 on the network system 5 side is first refused, and then the call from the terminal A1 is started, but the connection is established even though the terminal B8 gives a negative response. .

There is also a method of transmitting a DIC command in advance, and this example is shown in FIG. 10 (an explanatory diagram for explaining a method of transmitting a DIC command in advance). In this example, process A needs to be performed when the system starts up, and process B needs to be performed when the call is disconnected.

The problem with this method is that when there is a call from the terminal A1 in the middle of the processing B, there is a timing when the connection is established, and when the modem is initialized due to a momentary power interruption or the like. Process A must be performed,
It is difficult for NU5 to judge it.

An object of the present invention is to provide a technology capable of preventing invalid charging in a network system in which a plurality of terminals are connected to a telephone network via a network system.

The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0016]

According to the present invention, there is provided a network system in which a plurality of terminals are connected to a telephone network via a network system. 25b
The NU (network unit), which uses the DIC and CIC commands of is to synchronize the connection of the telephone network with the connection of the network system, receives the INC indication, which is an incoming call notification from the terminal, until it confirms the response of the partner terminal. If the DCE (modem) does not go off-hook, sends a DIC command, suspends the response operation, and then receives an acknowledgment from the partner terminal.
Send a CIC command to start a response operation.
If the response from the partner terminal after the transmission of the C command is negative, the most main feature is to turn off the ER signal and interrupt the connection operation.

[0017]

According to the above-described means, when the NU receives the INC indication, which is an incoming call notification from the terminal, the DCE goes off-hook until it confirms the response of the partner terminal (in response to the telephone network, the start of charging). If a DIC command is transmitted, the response operation is temporarily stopped, and an acknowledgment is received from the partner terminal,
Send a CIC command to start a response operation.
If the response from the partner terminal after the transmission of the C command is negative, the ER signal is turned off and the connection operation is interrupted, so that invalid charging in the connection between the telephone network and the network system can be prevented.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings.

In all the drawings, components having the same function are denoted by the same reference numerals, and their repeated description is omitted.

FIG. 1 is an explanatory view showing a schematic configuration of a network service in which a terminal and a partner terminal of one embodiment of the present invention use a telephone network and a network system. ), 2 is a telephone network, 3 is a first DCE (modem) connecting the terminal A1 to the telephone network 2, 4 is a second DCE (modem) connecting the telephone network 2 and a NU (network unit), 5 Is a NU (network unit), 6 is a network system, 7
Is a device other than the second DCE 4 and the NU 5 (for example, an exchange) constituting the network system, and 8 is a terminal B (a partner terminal). The network system 6 includes the second DCE 4, the NU 5, and other devices 7.

FIG. 2 is a call connection sequence for explaining the operation of preventing invalid charging according to the present embodiment.

Next, the operation of preventing invalid charging of the network service system of this embodiment will be described with reference to FIG.

First, the connection conditions are defined as follows: V.1 when a terminal connected via the telephone network makes a call to the network system 6. 25 bis command is used.

The network system 6 has a terminal A
When receiving the connection request from the terminal B1, the terminal B8 is notified that there is a connection request. Then, it is determined whether or not to make a connection based on a response from the terminal B8.

V.1 recommended by CCITT The NU 5 that synchronizes the connection of the telephone network 2 and the connection of the network system 6 using the DIC and CIC commands of 25 bis receives the INC indication, which is an incoming call notification from the terminal A1, and checks the response of the terminal B8. Until the second DC
In order to prevent E4 from going off-hook (a response to the telephone network and triggering the start of charging), a DIC command is transmitted and the response operation is temporarily stopped. After receiving an acknowledgment from the terminal B8, the CIC command is transmitted. Then, a response operation is started. If the response from the terminal B8 after the transmission of the DIC command is negative, the ER signal is turned off to interrupt the connection operation.

Next, another solution to which the method for preventing invalid billing of this embodiment is applied will be described. At present, there is no general modem that starts in the DIC mode (non-response mode). Therefore, in consideration of the operation of the method for preventing invalid billing of the present embodiment in FIG. 2, it becomes possible by modifying the DCE (modem).

That is, in FIG. 2, there is a period of several seconds from the transmission of the INC to the off-hook. If a DIC command is received during that time, the mode is changed to the DIC mode and the off-hook operation is temporarily stopped. In FIG. 3, this can be realized by modifying the modem so that the initial state can start from the DIC mode.

As shown in FIG. 4, the commands and indications in this embodiment are composed of three letters and parameters. Some commands / indications do not have parameters added. An example of the command is shown in FIG. 5, and an example of the indication is shown in FIG.
Shown in

As can be seen from the above description, according to the present embodiment, the NU 5 receives the IN notification from the terminal A1.
When the C indication is received, the second modem 4 does not go off-hook (response to the telephone network 2 to start charging) until the response of the terminal B8 is confirmed.
The C command is transmitted, the response operation is temporarily stopped, and then, when an acknowledgment is received from the terminal B8, the CIC command is transmitted and the response operation is started. If not, the ER signal is turned off and the connection operation is interrupted, so that invalid charging in the connection between the telephone network 2 and the network system 6 can be prevented.

Although the present invention has been described in detail with reference to the embodiments, it is needless to say that the present invention is not limited to the above-described embodiments and can be variously modified without departing from the scope of the invention. .

[0031]

As described above, according to the present invention, it is possible to prevent invalid billing in the connection between the telephone network and the network system.
When connection cannot be established due to a busy state or the like, there is no need to pay a telephone charge, and the service can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a network system in which a terminal and a partner terminal according to an embodiment of the present invention are connected to a telephone network via a network system.

FIG. 2 is a call connection sequence for explaining the operation of preventing invalid charging according to the embodiment;

FIG. 3 is a diagram for explaining another solution to which the invalid charging prevention method of the embodiment is applied.

FIG. 4 is a diagram for explaining a configuration of a command and an indication.

FIG. 5 is a diagram showing an example of a command.

FIG. 6 is a diagram showing an example of an indication.

FIG. 7 is a diagram for explaining a problem of charging in connection with a conventional telephone network and a network system.

FIG. 8 is a diagram for explaining a problem of charging in connection with a conventional telephone network and a network system.

FIG. 9 is a diagram for explaining a problem of charging in connection with a conventional telephone network and a network system.

FIG. 10 is a diagram for explaining a problem of charging in connection with a conventional telephone network and a network system.

FIG. 11 is a diagram for explaining a problem of charging in connection with a conventional telephone network and a network system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Terminal A, 2 ... Telephone network, 3 ... 1st DCE, 4 ... 2nd DCE, 5 ... NU, 6 ... Network system, 7 ...
Other devices, 8 ... Terminal B.

Continuation of front page (72) Inventor Yayohi Shimokaraminato 1-26-5 Toranomon, Minato-ku, Tokyo NTT Data Communication Co., Ltd. (56) References JP-A-2-19056 (JP, A JP-A-4-152746 (JP, A) JP-A-4-51648 (JP, A) JP-A-4-199954 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 11/00-11/10 H04M 15/00-15/38 H04L 29/08

Claims (1)

(57) [Claims] 1. A network system in which a plurality of terminals are connected to a telephone network via a network system, respectively, in a V.1 system recommended by CCITT. 25bis D
When the network unit that uses the IC and CIC commands to synchronize the telephone network connection and the network system connection receives the INC indication, which is an incoming call notification from the terminal, the modem does not go off-hook until the response of the partner terminal is confirmed. As described above, the DIC command is transmitted, the response operation is temporarily stopped, and then, when an acknowledgment is received from the partner terminal, the CIC command is transmitted and the response operation is started. A method for preventing invalid charging, characterized in that if the response is negative, the ER signal is turned off to interrupt the connection operation.