KR101014169B1 - Method for servicing Internet Protocol Push-To-Talk - Google Patents

Abstract

The present invention relates to an IP Push-To-Talk (PTT) service method for calling a plurality of terminals in a wired / wireless internal Internet Protocol (IP) network environment so that voice messages can be transmitted to each other. When a call signal is received from the first terminal calls the second terminal requesting, the IP PTT proxy server allocates and transmits a first Real-time Transport Protocol (RTP) port to the first and second terminals, After receiving the second RTP port from the first and second terminals, the IP PTT proxy server sequentially selects the first and second terminals, opens the first RTP port of the corresponding terminal, and searches for an RTP port with a response. The second RTP port of the terminal is updated with the searched RTP port, and when the speech request signal is received from one of the first and second terminals, the speech request signal is transmitted. Open the first RTP port of the received terminal and open the second RTP port of the terminal from which the speak request signal is not received so that a voice message is transmitted from the terminal from which the speak request signal is received to the terminal not receiving the speak request signal. .

PTT, RTP port, invitation signal, IP, terminal, proxy server, internal IP, public IP

Description

IPPT service method {Method for servicing Internet Protocol Push-To-Talk}

The present invention relates to an IP PTT service method for allowing one terminal to call a plurality of terminals in a wired / wireless internal Internet Protocol (IP) network environment to transmit voice messages to each other through push-to-talk (PTT).

Push-To-Talk (PTT) service is a dialing service that supports not only one-to-one communication but also one-to-many group communication using Trunked Radio System (TRS) among various types of wireless voice call services. It refers to a service that enables voice message transmission at the same time pressing a specific button without going through such a task.

Recently, the technical environment capable of providing PTT service has been advanced, and PTT service has been provided in mobile communication network environment and wired / wireless IP network environment.

Public IPs are assigned to various terminals including PDAs (Personal Digital Assistants) phones, smart phones, and IP phones, and IP PTT services are provided in a one-to-one or one-to-many format, such as radios. Is being provided.

The terminal receiving the public IP transmits the RTP port information for transmitting the voice message when responding to the group call received from the IP PTT server. The IP PTT server, which stores the transmitted RTP port information, receives a voice message spoken by a user who has a voice and transmits the voice message to the stored RTP port.

However, most network environments use only a minimum number of public IPs and a large number of internal IPs using NAT (Network Address Translation) network equipment due to lack of resources of public IPs and increased costs for using public IPs. .

When the terminal using the internal IP granted from the NAT network equipment responds to the call of the IP PTT server, the terminal cannot normally transmit a voice message due to the change of information of the RTP port by the NAT network equipment.

Therefore, the PTT service has been implemented by creating a PTT group room in the internal IP PTT communication and connecting each terminal to the corresponding group.

However, the method of executing the PTT service by creating the PTT group room and joining the respective groups to the corresponding group uses the internal IP through the group call without the PTT terminal joining the group. Due to the peculiarity of PTT communication that RTP packets are forwarded in one direction only when executed, even if the IP PTT server has a proxy function, the RTP port number of the external IP through the internal IP until both parties receive the RTP packets. There was a problem in that the internal IP network cannot deliver the image data including the actual voice because it cannot be recognized.

Therefore, the problem to be solved by the present invention is to solve the impossibility of making a call through the IP PTT group call in the wired / wireless internal IP network environment and provides an IP PTT service method that can implement the IP PTT service in the wired / wireless internal IP network environment.

According to the problem solving means of the present invention, in order to support the wired and wireless internal IP network environment, by adding a proxy function along with a PIM (Port Information Message) to the IP PTT server installed in PDA phones, smart phones, desktops equipped with soft phones In case of IP PTT communication such as soft phone, one-to-one or multi-party PTT communication is also performed in the internal IP network.

Therefore, the IP PTT service method of the present invention comprises the steps of: calling, by an IP (Internet Protocol) push-to-talk (PTT) proxy server, a second terminal requested by the first terminal when a call signal is received from the first terminal; The IP PTT proxy server allocates and transmits a first RTP port to the first and second terminals, and receives a second RTP port from the first and second terminals. Opening the first RTP port of the corresponding terminal while sequentially selecting the first and second terminals, searching for an RTP port with a response, and updating the second RTP port of the corresponding terminal with the found RTP port; When a speech request signal is received from one of the first and second terminals, the IP PTT proxy server opens the first RTP port of the terminal where the speech request signal is received and the speech request signal is received. And opening a second RTP port of an unreceived terminal so that a voice message is transmitted from a terminal from which the speak request signal is received to a terminal not receiving the speak request signal.

The call of the second terminal determines whether the first terminal calls a plurality of second terminals belonging to a predetermined group, and the plurality of calls corresponding to the case of calling a plurality of second terminals belonging to a predetermined group. Call both the second terminal.

In addition, the call of the second terminal is characterized in that the IP PTT proxy server transmits the invitation signal to the second terminal, and receives the invitation response signal from the second terminal that transmitted the invitation signal.

The update of the second RTP port may be updated when the searched RTP port is different from the second RTP port of the terminal.

In addition, the IP PTT service method of the present invention uses the first and second RTP ports opened when the speech release signal is received from the terminal device from which the speech request signal is received or the speech request signal continues for a preset time. It further comprises the step of closing all.

In addition, the IP PTT service method of the present invention is characterized in that the IP PTT service operation is terminated when both the first and second terminals release the connection.

IP PTT service method of the present invention has the effect that the terminal can be IP PTT service through the group call in the wired and wireless public IP network environment as well as wired and wireless internal IP network environment.

The following detailed description is only illustrative, and merely illustrates embodiments of the present invention. In addition, the principles and concepts of the present invention are provided for the purpose of explanation and most useful.

Accordingly, various forms that can be implemented by those of ordinary skill in the art, as well as not intended to provide a detailed structure beyond the basic understanding of the present invention through the drawings.

1 is a block diagram showing the configuration of a system in an IP network environment to which an Internet Protocol (IP) Push-To-Talk (PTT) service method of the present invention is applied. Here, reference numeral 100 denotes a plurality of terminals. The plurality of terminals 100 transmit a predetermined voice message to each other through a PTT, for example, as a personal digital assistant (PDA) phone, a smart phone, or an IP phone.

Reference numeral 110 is an IP PTT proxy server. The IP PTT proxy server 110 manages the plurality of terminals 100 to transmit a voice message through an RTP port one to one or one to many.

Reference numeral 120 is a wireless certified network. The wireless authorized network 120 wirelessly connects to the terminal 100 and the IP PTT proxy server 110 using a public IP, and the terminal 100 and the IP PTT proxy server 110 interoperate with each other. In addition to exchanging certain data, it is possible to transmit voice messages through the RTP port.

Reference numeral 130 is a wired authorized network. The wired public network 120 is connected to the terminal 100 and the IP PTT proxy server 110 by using a public IP wired, the terminal 100 and the IP PTT proxy server 110 mutually In addition to exchanging certain data, it is possible to transmit voice messages through the RTP port.

Reference numeral 140 is a wireless internal network. The wireless internal network 140 wirelessly connects to the terminal 100 using an internal IP and wirelessly connects to the IP PTT proxy server 110 using an internal IP, and the terminal 100 and the IP. The PTT proxy server 110 may exchange predetermined data with each other, as well as transmit voice messages through the RTP port.

Reference numeral 150 denotes a wired internal network. The wired internal network 150 connects to the terminal 100 using an internal IP by wire and to the IP PTT proxy server 110 using an internal IP, and the terminal 100 and the IP. The PTT proxy server 110 may exchange predetermined data with each other, as well as transmit voice messages through the RTP port.

2A to 2C are signal flow diagrams showing the operation of the preferred embodiment of the service method of the present invention. Referring to FIG. 2A, the Internet Protocol (IP) Push-To-Talk (PTT) proxy server 110 may include a wireless authorized network 120, a wired authorized network 130, a wireless internal network 140, and a wired internal network ( In step S200, it is determined whether a call signal is received from the first terminal 100 connected to any one of them.

When a call signal is received from the first terminal 100, the IP PTT proxy server 110 determines whether the received call signal is a group call signal for calling a plurality of second terminals 100 belonging to a specific group. It is determined (S202).

When the determination result is a group call signal, the IP PTT proxy server 110 determines a plurality of second terminals 100 belonging to the corresponding group (S204) and transmits an invitation signal to the determined plurality of second terminals 100. Call it (S206).

That is, when a plurality of groups are set in advance in the IP PTT proxy server 110 and a plurality of terminals 100 belonging to the group are stored in advance, the received call signal is a signal for calling a group. The plurality of second terminals 100 belonging to the corresponding group are determined, and an invitation signal is transmitted to the determined plurality of second terminals 100 to be called.

If it is determined that the call is not a group call, the IP PTT proxy server 110 transmits an invitation signal to one second terminal 100 which the first terminal 100 calls (S208).

In this state, the IP PTT proxy server 110 determines whether an invitation response signal is received from the second terminal 100 that has transmitted the invitation signal (S210), and when the invitation response signal is received, 1, the second terminal 100, which transmits a ring signal to the terminal 100, notifies that the call has been answered (S212).

In this state, the IP PTT proxy server 110 allocates a first RTP port to the first terminal 100 and the second terminal 100, and assigns the allocated first RTP port information to the first terminal 100 and the first terminal 100. It transmits to the second terminal 100 (S214). That is, the IP PTT proxy server 110 transmits information of the first RTP port to be used when transmitting a predetermined voice message to the first terminal 100 and the second terminal 100.

The IP PTT proxy server 110 receives information on the second RTP port transmitted by the first terminal 100 and the second terminal 100 (S216). That is, the first terminal 100 and the second terminal 100 receives the information of the second RTP port to send a voice message to the IP PTT proxy server 110.

In this state, the IP PTT proxy server 110 selects one terminal 100 from among the first terminal 100 and the second terminal 100 as shown in FIG. 2B (S218). After opening the first RTP port allocated to 100 (S220), a search for a responding RTP port is performed (S222).

When the responding RTP port is found, the IP PTT proxy server 110 determines whether the found RTP port is the same as the second RTP port transmitted by the selected terminal 100 (S224). If the RTP port is not the same as the second RTP port, the second RTP port of the terminal 100 is updated with the searched RTP port (S226).

That is, since the terminals 100 connected to the wireless authorized network 120 and the wired authorized network 130 use public IP, the second RTP port transmitted by the corresponding terminal 100 is the IP PTT proxy server 110. Matches the searched RTP port. However, since the terminals 100 connected to the wireless internal network 140 and the wired internal network 150 use the internal IP, the second RTP port transmitted by the corresponding terminal 100 is the IP PTT proxy server 110. Does not match the detected RTP port

Therefore, in the present invention, the first RTP port assigned by the IP PTT proxy server 110 to the terminal 100 is opened, the corresponding RTP port is searched after the corresponding RTP port is searched. 2, it is determined whether the same as the RTP port, and if the searched RTP port is not the same as the second RTP port of the terminal 100, the second RTP port of the terminal 100 is updated to the searched RTP port. The IP PTT proxy server 110 correctly receives the predetermined voice message transmitted by the terminal 100.

The IP PTT proxy server 110 determines whether all terminals 100 are selected (S228).

If not all terminals 100 are selected as the result of the determination, the IP PTT proxy server 110 returns to step S218 to select the terminal 100 and to select the first RTP port of the selected terminal 100. Search for a second RTP port with a response after opening the second RTP port; and if the searched second RTP port does not match the second RTP port of the terminal 100, the second RTP port of the terminal 100 is recalled. Repeat the update to the found RTP port.

When all the terminals 100 are selected as a result of the determination, as illustrated in FIG. 2C, the IP PTT proxy server 110 determines whether a speech request signal is input from a predetermined terminal 100 (S230). ). That is, the IP PTT proxy server 110 determines whether a user of a predetermined terminal 100 presses a specific button provided in the terminal 100 to transmit a voice message to the PTT service. To judge.

When the speech request signal is not input, it is determined whether the connection of all terminals 100 is released (S232).

When the speech request signal is input from the predetermined terminal 100 as a result of the determination, the IP PTT proxy server 110 speaks the speech request signal of all other terminals 100 except the terminal 100 to which the speech request signal is input. Block (S234), open the first RTP port of the terminal 100, the request for speech (S236), and open the second RTP port of another terminal that does not request to speak (S238).

Then, the voice message transmitted by the terminal 100 requesting to speak is input to the IP PTT proxy server 110 through the second RTP port of the terminal 100, and the input voice message is input to the first RTP port. It is transmitted to the other terminal 100 that does not request to speak.

In this state, the IP PTT proxy server 110 determines whether or not a speech release signal is received from the terminal 100 requesting to speak (S240), and when a speech release signal is not received, a preset time elapses. It is determined whether or not (S242).

When the speech release signal is received or a preset time elapses as a result of the determination, the IP PTT proxy server 110 notifies the terminal 100 of speech release (S244), and then closes all open RTP ports ( S246) Returning to the step (S230) and repeats the operation of determining whether the speech request signal is input from the predetermined terminal 100 or whether the connection of all the terminal 100 is released.

When all terminals 100 are disconnected, the IP PTT proxy server 110 ends the IP PTT service operation.

In this case, when the connection of all terminals 100 is released, the IP PTT proxy server 110 terminates the IP PTT service operation as an example. The termination of the IP PTT service operation may be made by selecting an option. have.

For example, when the superior delivers predetermined instructions to the subordinates, the IP PTT proxy server 110 may be configured to terminate the IP PTT service operation when the first terminal 100 blocks the access.

In the above, the present invention has been described in detail through exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

1 is a block diagram showing the configuration of a system in an IP network environment to which the IP PTT service method of the present invention is applied; and

2a to 2c are signal flow diagrams showing the operation of the preferred embodiment of the IP PTT service method of the present invention.

Claims (7)

Invoking , by an Internet Protocol (IP) Push-To-Talk (PTT) proxy server , a first terminal requesting a call when a call signal is received from the first terminal; Receiving a second RTP port is the proxy server IP PTT transmission by assigning the first RTP port as the first terminal and the second terminal, and from the first terminal and the second terminal; The IP PTT proxy server sequentially selects the first terminal and the second terminal, opens the first RTP port of the terminal, searches for an RTP port with a response, and uses the searched RTP port as a second RTP port of the terminal. Updating; And The first terminal and the second from the terminal a request signal speech from one device wherein the case is received the IP PTT proxy server, and opens the first RTP port of the statement requested signal is received terminal speech request signal is not received And opening a second RTP port of a terminal that has not been spoken so that a voice message is transmitted from the terminal that has received the speech request signal to a terminal that has not received the speech request signal. The method of claim 1, wherein the call of the second terminal; It is determined whether the first terminal calls a plurality of second terminals belonging to a predetermined group, and calls all the plurality of second terminals corresponding to calling a plurality of second terminals belonging to a predetermined group. IP PTT service method, characterized in that. The method of claim 1, wherein the call of the second terminal; The IP PTT proxy server transmits an invitation signal to a second terminal, and receives and invites an invitation response signal from the second terminal that transmitted the invitation signal. The method of claim 1, wherein updating the second RTP port; The IP PTT service method, characterized in that the renewal when the difference between the searched RTP port and the second RTP port of the terminal. The method of claim 1, Closing both the opened first RTP port and the second RTP port when a speech cancel signal is received from the terminal on which the speech request signal is received or a speech request signal continues for a predetermined time or more; IP PTT service method characterized in that. The method of claim 1, The IP PTT service method, characterized in that the IP PTT service operation is terminated when both the first terminal and the second terminal releases the connection. The method of claim 1, And terminating the IP PTT service operation when the first terminal blocks the access.

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