KR100917239B1 - PITITY control method for interworking between full-duplex voice packet network and half-duplex voice packet network - Google Patents

Abstract

The present invention relates to a PTT control method for interworking between full-duplex VoIP network and half-duplex VoIP network. More specifically, by sending and receiving a control message by the message protocol between terminals without a separate PTT control server, by simultaneously catching the PTT to prevent packet collisions, reduce the load on the network, to enable smooth communication between end-call users In addition, multiple terminals belonging to the half-duplex VoIP network exchange PTT control messages so that they can be used in a service that uses the same resources within the cell coverage and the half-duplex method in the wireless network, and also prevents a collision of voice packets. In addition, the present invention relates to a PTT control method for interworking between a full-duplex VoIP network and a half-duplex VoIP network that can maximize user convenience.

To this end, the present invention (a) when the terminal 1 in the full-duplex VoIP (Voice over Internet Protocol) network catches Push To Talk (PTT), the terminal 1 is holding the PTT to the terminal 2 in the half-duplex VoIP network Transmitting a control message to the effect; (b) the terminal 1 transmitting a voice packet to the terminal 2 after step (a); And (c) when the terminal 1 releases the PTT, the terminal 2 transmits a control message indicating that the terminal 1 sets the PTT. It provides a PTT control method for.

Description

PIT controlling method for interworking between full duplex voice packet network and half duplex voice packet network {PTT controlling method for communication between full duplex VoIP and half duplex VoIP}

The present invention relates to a PTT control method for interworking between full-duplex VoIP network and half-duplex VoIP network. More specifically, by sending and receiving a control message by the message protocol between terminals without a separate PTT control server, by simultaneously catching the PTT to prevent packet collisions, reduce the load on the network, to enable smooth communication between end-call users In addition, multiple terminals belonging to the half-duplex VoIP network exchange PTT control messages so that they can be used in a service that uses the same resources within the cell coverage and the half-duplex method in the wireless network, and also prevents a collision of voice packets. In addition, the present invention relates to a PTT control method for interworking between a full-duplex VoIP network and a half-duplex VoIP network that can maximize user convenience.

The voice packet network uses a conventionally used data communication packet network for Internet phones, and is called VoIP (Voice over Internet Protocol). In other words, VoIP refers to a technology for making voice calls over the Internet, and is a communication service technology that enables voice calls to be made in general telephone networks by converting voice data into Internet protocol data packets. VoIP can be used simultaneously by multiple people over a cable, has excellent scalability, and is much less expensive than traditional telephones.

Protocols related to VoIP include H.323, SIP, MGCP and MEGACO / H.248 for session establishment. VoIP equipment used in Korea is generally H.323. There are three global technical standards: VoIP, VoFR and VoATM. VoIP can be implemented by simply using a computer, such as a dial pad, or by using an IP phone or a dedicated router sold by a professional network equipment company.

1 is a conceptual diagram illustrating an example of a general VoIP network.

Using the VoIP technology as shown in FIG. 1, a call with a public switched telephone network (PSTN) as well as the Internet network is possible. In FIG. 1, the MG (Media Gateway) performs a function of changing the voice of the PSTN into an IP (Internet Protocol) packet.

FIG. 2A is a conceptual diagram illustrating an example of interworking VoIP between networks, and FIG. 2B is a conceptual diagram illustrating packet collision that may occur when interworking with VoIP as shown in FIG. 2A.

In FIG. 2A, network 1 is a wired network, a VoIP network supporting full duplex, and terminal 1 is a terminal supporting full duplex. On the other hand, network 2 is a wireless network, a VoIP network supporting half duplex, and terminal 2 and terminal 3 are terminals supporting half duplex. Among VoIP services, the services supported by wireless operate at half duplex due to low transmission speed.

In order to communicate with VoIP supporting half-duplex, a VoIP terminal supporting full-duplex must provide a push to talk (PTT) button function. That is, in order to make a call in conjunction with VoIP supporting half-duplex, a VoIP terminal supporting full-duplex should be performed like a half-duplex terminal. Therefore, in order to make a call to a terminal connected to network 2 supporting half duplex, a terminal connected to network 1 supporting full duplex performs a half-duplex terminal function.

As shown in FIG. 2B, when the terminal 1 connected to the network 1 and the terminal 3 connected to the network 2 are set up to make a call, when the PTT button is pressed only in one of the terminal 1 and the terminal 3, the voice packet is RTP (Real Time Protocol). ) Can be transmitted smoothly. However, when the terminal 1 and the terminal 3 simultaneously press the PTT button, there is a problem that the packet is collided, which causes excessive load on the network and smooth communication between users cannot be made.

The present invention has been made to solve the above problems, in particular to prevent the collision of packets even without a separate PTT control server, to reduce the load on the network, to enable smooth communication between end-call users, wireless It is not only half-duplex but also available in services that use the same resources within cell coverage, and also for interworking between full-duplex VoIP and half-duplex VoIP networks that can prevent voice packet collisions and maximize user convenience. The purpose is to provide a PTT control method.

PTT control method for interworking between a full-duplex VoIP network and a half-duplex VoIP network according to an aspect of the present invention devised to achieve the above object is (a) a terminal 1 belonging to a full-duplex VoIP (Voice over Internet Protocol) network PTT ( Transmitting a control message to the terminal 2 belonging to the half-duplex VoIP network, indicating that the terminal 1 is holding the PTT; (b) the terminal 1 transmitting a voice packet to the terminal 2 after step (a); And (c) when the terminal 1 releases the PTT, the terminal 1 transmits a control message indicating that the terminal 1 releases the PTT.

In addition, the terminal 2 receiving the control message that the terminal 1 is holding the PTT through step (a), may display a message indicating that the terminal 1 is holding the PTT on the screen.

In addition, the terminal 2 receiving the control message that the terminal 1 is holding the PTT through step (a) may stop the generation and transmission of voice packets.

Also, the terminal 2 receiving the control message indicating that the terminal 1 releases the PTT through step (c) may delete the message indicating that the terminal 1 holds the PTT previously displayed on the screen. have.

In addition, the terminal 2 having received the control message that the terminal 1 releases the PTT through step (c) may resume voice packet generation and transmission.

According to an aspect of the present invention, a PTT control method for interworking between a full-duplex VoIP network and a half-duplex VoIP network includes (a) when a terminal 2 belonging to a half-duplex VoIP (Voice over Internet Protocol) network catches a PTT (Push To Talk), Transmitting a control message to the terminal 1 belonging to the full-duplex VoIP network to the terminal 2 to hold the PTT; (b) the terminal 2 transmitting a voice packet to the terminal 1 after step (a); And (c) when the terminal 2 releases the PTT, the terminal 1 transmits a control message indicating that the terminal 2 releases the PTT.

In addition, the terminal 1 receiving the control message that the terminal 2 is holding the PTT through step (a), may display a message indicating that the terminal 2 is holding the PTT on the screen.

In addition, the terminal 1 receiving the control message that the terminal 2 is holding the PTT through step (a) may stop the generation and transmission of voice packets.

Further, the terminal 1 receiving the control message that the terminal 2 releases the PTT through the step (c) may delete the message indicating that the terminal 2 is holding the PTT previously displayed on the screen. have.

In addition, the terminal 1 receiving the control message that the terminal 2 releases the PTT through step (c) may resume voice packet generation and transmission.

According to another aspect of the present invention, a PTT control method for interworking between a full-duplex VoIP network and a half-duplex VoIP network includes: (a) receiving a call request from a terminal 1 belonging to a full-duplex VoIP network from a terminal 1; And (b) the terminal 2 broadcasting a message notifying that all the other terminals belonging to the half-duplex VoIP network do not hold the PTT and transmit data including voice.

In addition, the PTT control method (c) when the terminal 2 receives a control message from the terminal 1 to the effect that the terminal 1 is holding the PTT, the terminal 2 is a PTT to all other terminals belonging to the half-duplex VoIP network The method may further include broadcasting a message not to hold the message and to transmit data including the voice.

In addition, the PTT control method (d) before the terminal 2 makes a call request to the terminal 1, the terminal 2 does not hold the PTT to all other terminals belonging to the half-duplex VoIP network and do not transmit data including voice. Broadcasting a message intended; (e) The terminal 2 may further include making a call request to the terminal 1.

In addition, the PTT control method (f) before transmitting the control message that the terminal 2 is holding the PTT to the terminal 1, the terminal 2 does not hold the PTT to all other terminals belonging to the half-duplex VoIP network The method may further include broadcasting a message not to transmit data including voice.

In addition, the PTT control method (g) before the terminal 2 makes a request for termination of the call to the terminal 1, the terminal 2 does not transmit data including voice without holding the PTT to all other terminals belonging to the half-duplex VoIP network. The method may further include broadcasting a message for notifying.

According to the present invention by sending and receiving a control message by the message protocol between terminals without a separate PTT control server, at the same time to catch the PTT to prevent packet collisions, reduce the load on the network, to enable smooth communication between end call users It is effective.

In addition, according to the present invention, a plurality of terminals belonging to the half-duplex VoIP network can also exchange PTT control messages so that they can be used in a service that uses the same resources within the cell coverage and the half-duplex method in the radio, of course, collision of voice packets. This prevents in advance, and has the effect of maximizing user convenience.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible, even if shown on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the following will describe a preferred embodiment of the present invention, but the technical idea of the present invention is not limited thereto and may be variously modified and modified by those skilled in the art.

3 is a flowchart illustrating a PTT control method for interworking between a full duplex VoIP network and a half duplex VoIP network according to a preferred embodiment of the present invention.

In FIG. 3, it is assumed that terminal 1 belongs to network 1 which is a full duplex VoIP network, and terminal 2 belongs to network 2 which is a half duplex VoIP network. Hereinafter, although a terminal belonging to network 1 is represented as a terminal 1 and a terminal belonging to network 2 is referred to as a terminal 2, the same may also be applied to a case where a plurality of terminals belong to network 1 and / or network 2.

According to a preferred embodiment of the present invention, a PTT control method (hereinafter, referred to as a "PTT control method") for interworking between a full-duplex VoIP network and a half-duplex VoIP network is a control message for the purpose that the terminal 1 holds the PTT to the terminal 2. Step 102 of transmitting, a step 1 of transmitting a voice packet to a terminal 2 of the terminal 1, a step 106 of transmitting a control message indicating that the terminal 1 sets a PTT to the terminal 2, and the terminal 2 of the terminal A step 112 of transmitting a control message indicating that the terminal 2 is holding the PTT to the terminal 1, a step 2 of transmitting a voice packet to the terminal 1 of the terminal 2, and a terminal 2 placing the PTT to the terminal 1. And sending 116 a control message. The control message of "to hold the PTT" may be expressed in various ways, hereinafter, it will be referred to as a "PTT ON" message for convenience. In addition, the control message "to release the PTT" will be referred to as a "PTT OFF" message. Of course, the control message can be expressed in a different way.

First, a UE belonging to a full-duplex VoIP network transmits a voice packet to a UE belonging to a half-duplex VoIP network.

Step 102 is a step of transmitting a control message indicating that the terminal 1 is holding the PTT when the terminal 1 in the full-duplex VoIP network catches the PTT. At this time, the terminal 2 receiving the PTT ON message displays a message (for example, "PTT BUSY") that the other party (terminal 1) is holding the PTT on the screen. Through this, the user of the terminal 2 recognizes that the other party (terminal 1) is holding the PTT, and can prevent the packet collision by not holding the PTT. That is, when the terminal 2 receives the PTT ON message, the terminal 2 stops generating and transmitting the voice packet while displaying the PTT BUSY message.

Step 104 is a step in which the terminal 1 catching the PTT transmits a voice packet to the terminal 2 using the Real Time Protocol (RTP). Since the PTT BUSY message is displayed on the terminal 2 while the terminal 1 is transmitting the voice packet, the terminal 2 does not hold the PTT.

Step 106 is a step of transmitting a PTT OFF message to the terminal 2 when the terminal 1 completes the transmission of the voice packet releases the PTT. At this time, the terminal 2 receiving the PTT OFF message deletes the PTT BUSY message previously displayed on the screen. Through this, the user of the terminal 2 recognizes that the other party (terminal 1) has released the PTT, it can be seen that the user can grab the PTT. Accordingly, when the terminal 2 receives the PTT OFF message, the terminal 2 may stop displaying the PTT BUSY message and resume voice packet generation and transmission.

Next, a UE belonging to a half-duplex VoIP network transmits a voice packet to a UE belonging to a full-duplex VoIP network.

In step 112, when the terminal 2 belonging to the half-duplex VoIP network catches the PTT, it transmits a control message indicating that the terminal 2 holds the PTT to the terminal 1 belonging to the full-duplex VoIP network. At this time, the terminal 1 receiving the PTT ON message displays a message (for example, "PTT BUSY") that the other party (terminal 2) is holding the PTT on the screen. Through this, the user of the terminal 1 recognizes that the other party (terminal 2) is holding the PTT, and can prevent the packet collision by not holding the PTT. That is, when the terminal 1 receives the PTT ON message, the terminal 1 stops generating and transmitting the voice packet while displaying the PTT BUSY message.

Step 114 is a step in which the terminal 2 having a PTT transmits a voice packet to the terminal 1 using a Real Time Protocol (RTP). Since the PTT BUSY message is displayed on the terminal 1 while the terminal 2 is transmitting the voice packet, the terminal 1 does not hold the PTT.

Step 116 is a step of transmitting a PTT OFF message to the terminal 1 when the terminal 2 having completed the transmission of the voice packet releases the PTT. At this time, the terminal 1 receiving the PTT OFF message deletes the PTT BUSY message previously displayed on the screen. Through this, the user of the terminal 1 recognizes the fact that the other party (terminal 2) has released the PTT, it can be seen that it can catch the PTT. Accordingly, when the terminal 1 receives the PTT OFF message, the terminal 1 may stop displaying the PTT BUSY message and resume voice packet generation and transmission.

4 is a block diagram showing an example of the interworking of the VoIP network according to an embodiment of the present invention.

In FIG. 4, network 1 is a full-duplex VoIP network, network 2 is a half-duplex VoIP network, and voice packets are transmitted between terminal 1 belonging to network 1 and terminal 2 belonging to network 2. Here, half-duplex VoIP of wireless access is multiplexed using one and the same resource within cell coverage. In this case, in addition to transmitting and receiving a PTT control message between the terminals as in the case of FIG. 3, the terminal 2 needs to inform the terminal 3 and the terminal 4 using the same resource. Otherwise, even after the terminal 2 receives the PTT ON message from the terminal 1, the terminal 3 and / or the terminal 4 may transmit a data packet including a voice packet to the terminal 1 and / or the terminal 2, thereby causing a data collision. .

To this end, in the present invention, even in a service that uses the same resource in the cell coverage and the half-duplex method in the radio, PTT control messages are also exchanged between terminals belonging to the network 2 so as to avoid collision of voice packets.

5A to 5E illustrate a flow of a PTT control message related to call setup, voice transmission and reception, and call termination between UE 1 and UE 2 in the interworking example of FIG. 4.

5A is a flowchart illustrating a PTT control method related to call setup when a call request is made from terminal 1 to terminal 2. Referring to FIG.

Referring to FIG. 5A, step 202 is a step in which a terminal 2 in a half-duplex VoIP network receives a call request from a terminal 1 in a full-duplex VoIP network. In this case, the terminal 1 may transmit a SIP message called INVITE to the terminal 2 for the call request.

In this case, the terminal 2 broadcasts a message to all other terminals belonging to the half-duplex VoIP network, that is, to the terminal A, the terminal 3, and the terminal 4 of FIG. 4 not to hold the PTT and to transmit data including voice. Done. Hereinafter, the message "not to grab the PTT, and do not transmit data including voice" will be referred to as a "voice priority" message for convenience. As such, the terminal 2 transmits the voice priority message to the other terminal, thereby monopolizing the network so that no data collision occurs due to the other terminals transmitting the voice or other data. Accordingly, in step 204, the terminal 2 transmits a voice priority message to the terminal A.

In step 206, the terminal 2 transmits a response message 200 OK indicating that the terminal 1 accepts the call request.

In step 208, the terminal 1 receiving the 200 OK message transmits an ACK message in response thereto. Thus, call setup between the terminal 1 and the terminal 2 is completed.

Since the call setup is completed, other terminals (terminal A, terminal 3, terminal 4) may also hold a PTT and transmit a voice packet, and may also transmit a data packet. Accordingly, in step 210, a message for this purpose (for convenience, referred to as "voice priority release") is transmitted. Any terminal can transmit data while the voice priority is released.

5B is a flowchart illustrating a PTT control method related to call setup when a call request is made from terminal 2 to terminal 1.

Referring to FIG. 5B, step 212 is a step in which the terminal 2 broadcasts the voice priority message to other terminals before transmitting the call request message to the terminal 1. That is, before the terminal 2 makes a call request to the terminal 1, the terminal 2 transmits a voice priority message to all other terminals in the half-duplex VoIP network. By doing so, the terminal 2 notifies other terminals that it will establish a call before transmitting the call request message, so that other terminals do not transmit data.

In step 214, the terminal 2 transmits a call request message (INVITE) to the terminal 1.

In operation 216, the terminal 1 transmits a response message 200 OK indicating that the terminal 2 accepts the call request.

In step 218, the terminal 2 receiving the 200 OK message transmits an ACK message in response thereto. Thus, call setup between terminal 1 and terminal 2 is completed.

In step 210, the terminal 2 transmits a voice priority release message to another terminal, and thus, any terminal may transmit data.

5c is a flowchart illustrating a PTT control method in a process of transmitting and receiving a voice packet between a terminal 1 and a terminal 2. Referring to FIG.

Referring to FIG. 5C, step 222 is a step in which the terminal 2 broadcasts the voice priority message to the terminals belonging to the network 2 before transmitting the PTT ON message to the terminal 1. The terminal 2 informs other terminals that it will catch the PTT before transmitting the PTT ON message, so that other terminals do not transmit data.

Step 224 is a terminal 2 transmits a PTT ON message to the terminal 1, step 226 is a terminal 2 transmits a voice packet to the terminal 1.

When the voice packet transmission of the terminal 2 is completed, the terminal 2 transmits a PTT OFF message to the terminal 1 (step 228).

In step 230, the terminal 2 transmits a voice priority release message to another terminal, and thus, any terminal may transmit data.

In step 232, UE 1 transmits a PTT ON message to UE 2. When the terminal 2 receives the PTT ON message, the terminal 2 broadcasts the voice priority message to the other terminals of the network 2 (step 234).

Thereafter, the terminal 1 transmits a voice packet to the terminal 2 (step 236), and transmits a PTT OFF message to the terminal 2 when the transmission is completed (step 238).

Since the terminal 2 has received the PTT OFF message, it transmits a voice priority release message to the other terminals of the network 2 (step 240).

To sum it up briefly:

First, the terminal 2 broadcasts the voice priority message to the network 2 before transmitting the PTT ON message to the terminal 1, and the terminal 2 broadcasts the voice priority release message to the network 2 after transmitting the PTT OFF message to the terminal 1. .

Second, when the terminal 2 receives the PTT ON message of the terminal 1, it broadcasts the voice priority message to the network 2, and the terminal 2 broadcasts the voice priority release message to the network 2 when the terminal 1 receives the PTT OFF message.

FIG. 5D is a flowchart illustrating a PTT control method related to call termination when there is a call termination request from UE 2 to UE 1, and FIG. 5E is a flowchart of a PTT control method related to call termination when there is a call termination request from UE 1 to UE 2. to be. That is, FIG. 5D illustrates a case where the terminal 2 requests termination of the call, and FIG. 5E illustrates a case where the terminal 1 requests termination of the call.

Referring to FIG. 5D, step 242 is a step of broadcasting a voice priority message to all other terminals in the network 2 before the terminal 2 makes a call termination request to the terminal 1.

In operation 244, the terminal 2 transmits a call termination request message (BYE) to the terminal 1, and the operation 246 transmits a response message 200 OK indicating that the terminal 1 accepts the terminal termination request. As such, when the call between the terminal 1 and the terminal 2 is terminated, the terminal 2 broadcasts a voice priority release message to other terminals in the network 2 (step 248).

On the other hand, when the terminal 2 receives the call termination request from the terminal 1 as shown in FIG. 5e (step 252), the terminal 2 does not broadcast the voice priority message to the other terminals of the network 2 immediately without the response message (200 OK) send.

The above description is merely illustrative of the technical idea of the present invention, and various modifications, changes, and substitutions may be made by those skilled in the art without departing from the essential characteristics of the present invention. will be. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by the embodiments and the accompanying drawings. . The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

The present invention relates to a PTT control protocol that enables interworking of a VoIP network by sending and receiving a PTT control message between terminals instead of using a PTT control server, and can be widely used in a VoIP network.

1 is a conceptual diagram illustrating an example of a general VoIP network;

2A is a conceptual diagram illustrating an example of interworking between VoIP networks;

FIG. 2B is a conceptual diagram illustrating packet collision that may occur when VoIP interworking as shown in FIG. 2A;

3 is a flowchart illustrating a PTT control method for interworking between a full duplex VoIP network and a half duplex VoIP network according to an embodiment of the present invention;

4 is a configuration diagram showing an example of interworking of the VoIP network according to an embodiment of the present invention;

5a is a flowchart illustrating a PTT control method related to call setup when a call request is made from terminal 1 to terminal 2;

5b is a flowchart illustrating a PTT control method related to call setup when a call request is made from terminal 2 to terminal 1;

5c is a flowchart of a PTT control method in a process of transmitting and receiving a voice packet between a terminal 1 and a terminal 2;

5d is a flowchart illustrating a PTT control method related to call termination when a call termination request is made from terminal 2 to terminal 1;

5E is a flowchart illustrating a PTT control method related to call termination when there is a call termination request from UE 1 to UE 2.

Claims (15)

(a) When the terminal 1 belonging to the full-duplex VoIP (Voice over Internet Protocol) network catches Push To Talk (PTT), it sends a control message to the terminal 2 belonging to the half-duplex VoIP network to inform that the terminal 1 is holding the PTT. Transmitting; (b) the terminal 1 transmitting a voice packet to the terminal 2 after step (a); And (c) when the terminal 1 releases the PTT, the terminal 2 transmits a control message indicating that the terminal 1 releases the PTT. PTT control method for interworking between a full-duplex VoIP network and a half-duplex VoIP network comprising a. The method of claim 1, The terminal 2 receiving the control message indicating that the terminal 1 is holding the PTT through step (a) displays a message indicating that the terminal 1 is holding the PTT on the screen. PTT control method for interworking between network and half-duplex VoIP network. The method according to claim 1 or 2, The terminal 2 receiving the control message indicating that the terminal 1 is holding the PTT through the step (a) interworkss with the full duplex VoIP network and the half duplex VoIP network, which stops generating and transmitting a voice packet. PTT control method. The method of claim 2, The terminal 2 receiving the control message indicating that the terminal 1 releases the PTT through step (c) deletes the message indicating that the terminal 1 holds the PTT previously displayed on the screen. PTT control method for interworking between full-duplex VoIP network and half-duplex VoIP network. The method of claim 4, wherein For the interworking between the full-duplex VoIP network and the half-duplex VoIP network, the terminal 2 receiving the control message that the terminal 1 releases the PTT through step (c) resumes the voice packet generation and transmission. PTT control method. (a) When the terminal 2 in the half-duplex Voice over Internet Protocol (VoIP) network catches Push To Talk (PTT), it sends a control message to the terminal 1 in the full-duplex VoIP network, indicating that the terminal 2 is holding the PTT. Transmitting; (b) the terminal 2 transmitting a voice packet to the terminal 1 after step (a); And (c) when the terminal 2 releases the PTT, the terminal 1 transmits a control message indicating that the terminal 2 releases the PTT; PTT control method for interworking between a full-duplex VoIP network and a half-duplex VoIP network comprising a. The method of claim 6, The terminal 1 receiving the control message that the terminal 2 is holding the PTT through the step (a), full-duplex VoIP characterized in that the terminal 2 displays a message that the terminal is holding the PTT PTT control method for interworking between network and half-duplex VoIP network. The method according to claim 6 or 7, For the interworking between the full-duplex VoIP network and the half-duplex VoIP network, the terminal 1 receiving the control message indicating that the terminal 2 is holding the PTT through step (a) is stopped. PTT control method. The method of claim 7, wherein The terminal 1 receiving the control message indicating that the terminal 2 releases the PTT through step (c) deletes the message indicating that the terminal 2 holds the PTT previously displayed on the screen. PTT control method for interworking between full-duplex VoIP network and half-duplex VoIP network. The method of claim 9, For the interworking between the full-duplex VoIP network and the half-duplex VoIP network, the terminal 1 receiving the control message that the terminal 2 releases the PTT through step (c) resumes voice packet generation and transmission. PTT control method. (a) receiving a call request from a terminal 1 belonging to a half-duplex VoIP network from a terminal 1 belonging to a full-duplex VoIP network; And (b) the terminal 2 broadcasting a message notifying that all the other terminals belonging to the half-duplex VoIP network do not hold the PTT and transmit data including voice. PTT control method for interworking between a full-duplex VoIP network and a half-duplex VoIP network comprising a. The method of claim 11, (c) When the terminal 2 receives a control message from the terminal 1 to the fact that the terminal 1 is holding the PTT, the terminal 2 does not hold the PTT to all other terminals belonging to the half-duplex VoIP network. The PTT control method for interworking between a full-duplex VoIP network and a half-duplex VoIP network, characterized in that it further comprises the step of broadcasting a message not to transmit. The method of claim 12, (d) Before the terminal 2 makes a call request to the terminal 1, the terminal 2 broadcasts a message notifying that all other terminals in the half-duplex VoIP network do not transmit the data including voice and PTT. broadcasting); (e) the terminal 2 making a call request to the terminal 1 PTT control method for interworking between a full-duplex VoIP network and a half-duplex VoIP network, characterized in that it further comprises. The method of claim 13, (f) Before the terminal 2 transmits a control message indicating that the terminal 2 is holding the PTT, the terminal 2 does not transmit data including voice to the other terminals belonging to the half-duplex VoIP network without holding the PTT. PTT control method for interworking between full-duplex VoIP network and half-duplex VoIP network, characterized in that it further comprises the step of broadcasting a message that the message is not. The method of claim 14, (g) Before the terminal 2 makes a request for termination of the call to the terminal 1, the terminal 2 broadcasts a message notifying the other terminals of the half-duplex VoIP network not to transmit the data including voice and PTT. A PTT control method for interworking between full-duplex VoIP network and half-duplex VoIP network, characterized in that it further comprises the step of (broadcasting).

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