KR100387705B1 - Method of adapting for R2 signaling and H.323 signaling - Google Patents

Abstract

The present invention relates to the matching of R2 signaling and H.323 signaling between a public telephone network, a VoIP gateway, and the Internet network. According to a method of matching R2 signaling and H.323 signaling according to the present invention, a VoIP gateway requests a call connection of a public telephone network. Collecting the called party's telephone number, transmitting a completion message to the public telephone network, and receiving a charging information information request message from the public telephone network; Transmitting, by the VoIP gateway, the charge availability information to the public telephone network, and then transmitting a call connection request message to the Internet network; Searching whether a call response message is received according to the call connection request message; And when the call response message is received, setting a response status flag of the VoIP gateway and connecting a call by transmitting a connection response message to a public telephone network according to the connection confirmation message received from the Internet network. It is composed.

According to the present invention, the VoIP gateway sends a connection request message to the Internet by placing a response status flag on the response message from the Internet network to the VoIP gateway that the charge charged was not accurate because R2 signaling was not terminated normally. Even if a call release message is sent immediately afterwards, the R2 signal is terminated normally so that charging is more accurate.

Description

Method of adaptation for R2 signaling and H.233 signaling {Method of adapting for R2 signaling and H.323 signaling}

The present invention relates to signal matching in a voice over internet protocol (VoIP) gateway system using H.323 and a public switched telephone network (PSTN) interworking, and in particular, between a public telephone network and a VoIP gateway. The present invention relates to a method of matching R2 signaling and H.323 signaling to solve problems of R2 signaling and message flow in the H.323 protocol.

VoIP gateway converts analog signal into IP packet suitable for Internet / Intranet network or converts IP packet data into analog signal.It converts analog signal from telephone or exchange into IP packet to Internet / Intranet network. It exports or converts IP packets from the Internet / Intranet network to analog signals and exports them to the telephone or exchange.

The public telephone network and the VoIP gateway exchange messages by R2 signaling, and the VoIP gateway and the Internet network exchange signals by the H.323 protocol.

The R2 signal is largely classified into a line signal and a register signal. The line signal is used to control a transmission medium connecting two exchangers that send and receive signals, and the register signal is used to exchange call information between two exchange periods. The low register signal is divided into an omni-directional signal sent by the calling party and a backward signal sent by the receiver to confirm receipt of the omni-directional signal.

In addition, R2 signaling usually processes signals in the order of normal state-occupied register signal exchange-answer-call-call-side recovery- called-side recovery-recovery monitoring. Will start. The digital monitoring signal of the R2 signaling transmits only a and b in a continuous signal form among the a, b, c and d signal channels, which are 4 bits of the 16 channel time slots of each frame except the 0 frame of the PCM signal. The c and d signals are fixed at 0,1.

The values of a and b signals according to the above line conditions are shown in Table 1.

Line status Normal state occupancy Occupancy Check answer Outbound recovery Incoming party recovery Closure Omni-directional (a, b) 1,0 0,0 0,0 0,0 0,0 1,0 1,0 Backward direction (a, b) 1,0 1,0 1,1 0,1 1,1 0,1 or 1,1 1,1

The call flow of the R2 signal and the H.323 signal for charging between the public telephone network and the VoIP gateway system is as shown in FIGS. 1 and 2, and FIG. 1 is inaccurate in calculating the charging time between the conventional public telephone network and the VoIP gateway system. Fig. 2 is a view showing a call flow diagram in case of termination, and Fig. 2 is a view showing a call flow diagram in a case where the R2 signal between the conventional public telephone network and the VoIP gateway system is not terminated.

Referring to FIG. 1, the VoIP gateway is used to connect a call according to the R2 signaling between the public telephone network 10 and the VoIP gateway 20 and the H.323 signaling between the VoIP gateway 20 and the Internet network 30. 20 collects the telephone number of the called party in the R2 signaling (S10). At this time, the state of the VoIP gateway 20 becomes the occupancy check state, that is, '11' in the normal state '10', and informs the public telephone network 10 that the collection is completed (S11).

The public telephone network 10 requests the VoIP gateway 20 for information on charging or not (S12), and the VoIP gateway 20 sends information about the charging or not (S13) and simultaneously calls for In response to the call is connected, the status is set as a response state, that is, '01' (S14).

Soon, the VoIP gateway 20 requests a connection by sending a call connection request message (SETUP_REQ) to the Internet network 30 (S15), and soon after receiving the call response message (ALERT_IND) from the Internet network 30. (S16), the connection confirmation message (CONNECT_IND) receives the call to connect the call (S17).

In addition, when the call release request message REL_IND is transmitted to the VoIP gateway 20 (S18), the R2 signal with the public telephone network 10 is released (S19). At this time, the state becomes '11' which is a closed state.

In the call setup process, from the time point at which the call path is connected from the VoIP gateway 20 (step S14), the call is charged up to the time point at which the call is released (step S19).

When the charging is performed by matching the R2 signal with the H.323 signal in the same manner as described above, the call is started and the call response signal is transmitted from the Internet network 30 late in step S16 because the connection is attempted with the Internet network. If so, there is a problem that more charges are charged than the actual time for making a call.

Therefore, the billing method may be selected as shown in FIG. 2.

2, when the VoIP gateway 20 collects the called party's telephone number (S21), and notifies the public telephone network 10 that the collection is completed (S22), the public telephone network 10 is a VoIP gateway ( 20) the billing information is requested (S23).

The VoIP gateway 20 receiving the billing information request transmits a call connection request message (SETUP_REQ) to the Internet network 30 (S24), receives a call answering message (ALERT_IND) (S25), and the public telephone network ( 10) the charging information is transmitted (S26).

In addition, when the VoIP gateway 20 receives a connection message CONNECT_IND from the Internet network 30 (S27), the VoIP gateway 20 transmits a response signal indicating that a call path is connected to the public telephone network 10 so as to make a call. (S28).

Call release process is the same as the process of Figure 1, by receiving a call release request message from the Internet network 30, and releases the R2 signaling.

At this time, charging is performed from the reception of the response signal that the call path is connected from the VoIP gateway 20 until the R2 signaling is released.

However, the above method may also cause an error in billing.

That is, the state is charged as the state between the public telephone network 10 and the VoIP gateway 20 changes from the '11' state in the response state to the '11' state in the released state from the '11' state in response, for any reason. Immediately after the VoIP gateway 20 sends a call connection request message to the Internet network 30, upon receiving a call release request message from the Internet network 30, the state between the public telephone network 10 and the VoIP gateway 20 is established. Will continue from the response state '11' to the release state '11' and continue to '11', so the termination of the R2 signal is not normal and the state continues to occupy the channel. There is a problem that can be.

In order to solve the problems as described above, the present invention can be unclear the connection and disconnection of the call in the matching of the R2 signaling and H.323 signaling in the past, an error may occur in charging the charge, It provides a matching method of R2 signaling and H.323 signaling that puts a status flag on the VoIP gateway so that it can accurately understand call establishment and release, and can charge accurate rates without error in charging. There is a purpose.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a call flow in the case where calculation of billing time between a conventional public telephone network and a VoIP gateway system becomes incorrect.

Fig. 2 is a diagram showing a call flow when the R2 signal between the conventional public telephone network and the VoIP gateway system is not terminated.

3 is a flowchart illustrating a call in a method of matching R2 signaling and H.323 signaling according to an embodiment of the present invention.

4 is a flowchart illustrating a call connection operation procedure by a method of matching R2 signaling and H.323 signaling according to an embodiment of the present invention.

5 is a flowchart illustrating a procedure of call release by a method of matching R2 signaling and H.323 signaling according to an embodiment of the present invention.

<Brief description of the main parts of the drawings>

10: public telephone network 20: VoIP gateway

30: Internet network

The matching method of R2 signaling and H.323 signaling according to the present invention,

In response to a call connection request of the public telephone network, collecting a called party's telephone number, transmitting a collection completion message to the public telephone network, and receiving a charging information information request message from the public telephone network;

Transmitting, by the VoIP gateway, the charge availability information to the public telephone network, and then transmitting a call connection request message to the Internet network;

Searching whether a call response message is received according to the call connection request message;

And when the call response message is received, setting a response status flag of the VoIP gateway and connecting a call by transmitting a connection response message to a public telephone network according to the connection confirmation message received from the Internet network. It is characterized in that the configuration.

Preferably, disconnecting the call comprises: receiving, by a VoIP gateway, a call release request message from the Internet network, and checking whether a response state flag is set; If the answer state flag is not set, the VoIP gateway sends a connection response message to a public telephone network to notify that a call is connected, and changing the VoIP gateway state to an occupied state; After changing to the occupied state, and transmitting a call release message to the public telephone network, characterized in that the step of releasing the R2 signal by changing the VoIP gateway state to the release state.

Preferably, when the response state flag is set, the call release message is transmitted to the public telephone network, and the state of the VoIP gateway is changed to the release state.

A matching method of R2 signaling and H.323 signaling according to the present invention as described above will be described with reference to the accompanying drawings.

3 is a flowchart illustrating a call in a method of matching R2 signaling and H.323 signaling according to an embodiment of the present invention, and FIG. 4 is a method of matching R2 signaling and H.323 signaling according to an embodiment of the present invention. 5 is a flowchart illustrating a call connection operation procedure, and FIG. 5 is a flowchart illustrating a call release operation by a matching method of R2 signaling and H.323 signaling according to an embodiment of the present invention.

Referring to FIG. 3, in order to charge according to a call connection between the public telephone network 10, the VoIP gateway 20, and the Internet network 30, the VoIP gateway 20 is requested by the call connection request of the public telephone network 10. ) Collects the called party's telephone number (S101), and when the collection is completed, informs the public telephone network 10, and changes the state to '11' to become a response state (S102).

According to the collection completion signal of the VoIP gateway 20, the public telephone network 10 requests the VoIP gateway 20 for charging information on whether or not to charge (S103), and the VoIP gateway 20 charges the billing information. The information is transmitted (S104).

In addition, the VoIP gateway 20 transmits the billing information to the public telephone network 10, and immediately sends a message (SETUP_REQ) requesting connection to the Internet network 30 (S105), the Internet network 30 When a call answering message (ALERT_IND) is received from the receiver, the response status flag is set (S106), the connection confirmation message is received from the Internet network 30 (S107), and the call is transmitted by sending a response message to the public telephone network. (S108)

In this case, the response status flag is initially set to '0' and is set to '1' when a response message is received, depending on whether or not a call response message is transmitted from the Internet network 30.

Accordingly, after the VoIP gateway 20 transmits a connection request signal to the Internet network 30, upon receiving a call release request message from the Internet network 30, the VoIP gateway 20 immediately searches for a response status flag.

If the status flag is '0', it means that a call release message has been received without a response message. Therefore, a response message for a call connection is transmitted to the public telephone network 10, and the state is changed to '01'. After changing to the occupied state, the call release request message is sent to the public telephone network 10, and the state is changed to '11' again to change to the released state.

Accordingly, the R2 signal may recognize that the call is disconnected and immediately release the call, and stop charging.

In addition, if the state flag is '1', the call release message is received after receiving the response message, and the public telephone network 10 has already started charging, and the state of the VoIP gateway 20 is also occupied by '01'. Therefore, without passing through another process, and immediately sends a call release message to the public telephone network 10 to terminate the R2 signal, change the state to '11' to change to the release state.

That is, when described in more detail with reference to Figures 4 and 5, the VoIP gateway 20 initially starts by resetting the response status flag to '0' in the normal state (S201), the called party according to the call connection request Collect the phone number (S202).

After collecting the called party's telephone number, the VoIP gateway 20 transmits the collection completion message to the public telephone network 10 and changes to a response state (S203).

The public telephone network 10 requests the charging information to the VoIP gateway 20 (S204), and the VoIP gateway 20 transmits the charging information to the VoIP gateway 20 (S205), and connects to the Internet network 30. The message is transmitted (S206).

The VoIP gateway 20 waits for a connection response message from the Internet network 30, searches whether a connection response message is received (S207), and sets the response status flag to '1' when the connection response message is received (S207). S208).

Then, by receiving a connection confirmation message from the Internet network 30 (S209), and transmits a connection response message to the public telephone network 10 to connect the call (S210).

5, when the VoIP gateway 20 receives a call release request signal from the Internet network 30 (S301), it is determined whether the current response state flag is '1'. It is confirmed (S302).

If, in step S302, the response status flag is '0' instead of '1', it means that the VoIP gateway 20 has not yet received a connection response message from the Internet network 30. The connection response message is transmitted (S303), and its state is changed to the occupied state '01' (S304), and then the call release request message is transmitted to the public telephone network 10 (S305), and its state is Change to the release state '11' (S306).

Through the above process, the R2 signaling between the public telephone network 10 and the VoIP gateway 20 ends normally (S307).

In addition, if the response status flag is '1' in step S302, the connection response message has already been received from the Internet network 30, and the response message is sent to the public telephone network 10, which means that the call is occupied. In order to transmit the call release message to the public telephone network (S305), and set its state to '11' (S306) to terminate the R2 signaling (S307).

As described above, in the matching method of R2 signaling and H.323 signaling according to the present invention, the VoIP gateway sends a connection request message to the Internet by placing a response status flag on the response message from the Internet. Even if a call release message is sent immediately afterwards, the R2 signal is terminated normally so that charging is more accurate.

Claims (3)

In response to a call connection request of the public telephone network, collecting a called party's telephone number, transmitting a collection completion message to the public telephone network, and receiving a charging information information request message from the public telephone network; Transmitting, by the VoIP gateway, the charge availability information to the public telephone network, and then transmitting a call connection request message to the Internet network; Searching whether a call response message is received according to the call connection request message; And setting a response status flag of the VoIP gateway when the call response message is received, and connecting the call by transmitting a connection response message to the public telephone network according to the connection confirmation message received from the Internet network. How to Match R2 Signaling with H.323 Signaling. 2. The method of claim 1, wherein disconnecting the call is Receiving, by a VoIP gateway, a call release request message from the Internet network, and checking whether a response state flag is set; If the answer state flag is not set, the VoIP gateway sends a connection response message to a public telephone network to notify that a call is connected, and changing the VoIP gateway state to an occupied state; After changing to the occupied state, transmitting a call release message to the public telephone network, and releasing the R2 signal by changing the state of the VoIP gateway to the released state; matching R2 signaling and H.323 signaling Way. The method of claim 2, wherein when the response state flag is set, And transmitting the call release message to the public telephone network and changing the state of the VoIP gateway to the released state.