KR20050114154A - System for push to talk service and method for call setup thereof - Google Patents

Abstract

According to the present invention, the PTT service system converts an application message generated for initial call setup of a PTT service into a binary message according to a binary message rule defined according to a message type, and transmits it through an air segment or through an air segment. A PTT terminal that performs an initial call setup procedure for converting a received binary message into an application message by a binary message rule, and converts a binary message received through an air section from the terminal into an application message by a binary message rule, and a PTT service. It is configured to include a PTT server for converting the application message generated for the initial call setup to the binary message by the binary message rule to the terminal through the air section to perform the initial call setup procedure, the terminal and the PTT server PTT Start service As when performing a call setup process for groups, in the air to give the interval defined binary message reception was to reduce the delay time of the call setup.

Description

PITITY SERVICE SYSTEM AND CALL SETTING METHOD {SYSTEM FOR PUSH TO TALK SERVICE AND METHOD FOR CALL SETUP THEREOF}

The present invention relates to a PTT service, and in detail, when a PTT terminal and a PTT server perform a call setup process for initiating a PTT service, each SIP message to be exchanged between the terminal and the PTT server for call setup is included. For example, the present invention relates to a PTT service system and a call setup method of the system that define a binary message for each type, and reduce the delay time according to call setup by exchanging the defined binary message in an air section.

Today, due to the development of wired / wireless networks and the development of voice call services, interest in higher quality voice call services is increasing.

In this context, the interest in the voice call service of the Push To Talk (PTT) service method is increasing.

PTT service refers to instant messenger service that is similar to a radio service, and provides a very fast communication service when compared to the waiting time of general mobile communication service because subscribers can simply communicate by pressing the call switch of the terminal. I can receive it.

In addition, in the case of the PTT service for a group, that is, one person may listen to one subscriber speaking while pressing a call switch of a terminal through each terminal.

1 is a block diagram illustrating a system for performing a general PTT service.

Referring to FIG. 1, the PTT service system includes a plurality of terminals 11 and 12, a plurality of Packet Data Serving Nodes (PDSNs) 31 and 32, a plurality of Base Station Controllers (BSCs) 21, 22, and PTT system 40.

The plurality of terminals 11 and 12 receive signals transmitted from the BSCs 21 and 22 in the serving cells of the respective BSCs 21 and 22 and wirelessly transmit signals according to voice or data input from the subscribers. To the corresponding BSCs 21 and 22.

Each BSC 21 and 22 transmits a signal received from each terminal 11 and 12 included in the corresponding service cell to each PDSN 31 and 32 connected to the wired network, and each PDSN 31, The signal received from 32 is wirelessly transmitted to each terminal 11 and 12 included in the corresponding service cell.

That is, each BSC 21, 22 allocates or releases a radio channel for each terminal 11, 12 included in the serving cell, and handles handoff to ensure mobility of each terminal 11, 12. .

Each BSC 21 and 22 converts an analog signal received from each of the terminals 11 and 12 included in the service cell into a digital signal that can be transmitted to an E1 / T1 level line, thereby converting each PDSN ( 31 and 32, and converts the digital signal received from each PDSN (31, 32) into an analog signal that can be transmitted to each terminal (11, 12) by wireless, and transmits it to each terminal (11, 12).

In addition, each of the PDSNs 31 and 32 converts a digital signal received through a wired network into an IP packet that can be transmitted to an IP network, and transmits an IP packet received from the IP network to a wired network. The signal is converted and transmitted to each BSC 21 and 22.

Each of the terminals 11 and 12 included in the service cell of each BSC 21 and 22 is connected to a network including each PDSN 31 and 32 connected to each BSC 21 and 22 by a wired network. This is called an access network (AN).

In addition, although FIG. 1 illustrates a system for providing a PTT service between a plurality of terminals 11 and 12, when providing a PTT service between a plurality of terminals, a plurality of BSCs corresponding to the plurality of terminals in an access network (AN) are illustrated. And a plurality of PDSNs.

The PTT system 40 analyzes an IP packet transmitted from each PDSN 31 and 32, sets up a talk session between terminals 11 and 12, and provides a PTT service.

Referring to Figure 1 will be briefly described the flow of a method for providing a PTT service.

When the subscriber wants to receive voice call service by setting up a call call with the second terminal 12 using the first terminal 11, the first terminal 11 generates a call request signal to generate the first BSC 21. To send).

In addition, the first BSC 21 converts the analog call request signal received from the first terminal 11 into a digital call request signal and transmits the signal to the first PDSN 31, and the first PDSN 31. When the call request signal is received, transmits a call request message in the form of an IP packet to the PTT system 40.

The PTT system 40 checks the address information of the called terminal in the received call request message and checks the connection state of the called terminal 12. That is, the PTT system 40 checks the connection state of the second terminal 12.

If the connection state of the second terminal 12, which is the called terminal, is in the logged in state, the PTT system 40 transmits a call request message to the second PDSN 32, and the second PDSN 32. Converts the call request message in the form of an IP packet into a call request signal in a digital signal manner and transmits the call request message to the second BSC 22.

In addition, the second BSC 22 converts the call request signal, which is a digital signal method, into a call request signal of an analog signal method, and transmits the call request signal to the second terminal 12.

When the response message to the call request message is received from the second terminal 12, the PTT system 40 sets up a call call between the first terminal 11 and the second terminal 12 to perform a PTT service scheme. Provide voice call service.

On the other hand, PTT service is based on SIP (Session Initiation Protocol), which is a text-based application level protocol, which has a simple structure and extensibility compared to the existing protocol. Adopted.

In general, SIP is a standard defined in the Internet Engineering Task Force (IETF) Request for Comments (RFC) 2543 3261 document, and is an application for establishing, modifying and terminating sessions or calls for multimedia communication such as video and voice. Layer control protocol. SIP is a protocol existing over the UDP / TCP / IP UDP / IP or TCP / IP layer. It is a client / server protocol that can send and receive SIP Request and SIP Response messages in a request / response manner. Both unicast and multicast sessions are supported for initiating sessions by inviting them to.

SIP request messages are available in RFC3261 as INVITE (Invite to attend session), ACK (acknowledge request), BYE (end call), REGISTER (user agent registers in the redirect server's database), CANCEL (cancel pending requests), OPTIONS Six basic functions are provided, and SIP response messages include 1xx (information response), 2xx (successful response), 3xx (redirect response), 4xx (client error, request failure), 5xx (server failure), and 6xx status codes. (Global failure).

The SIP protocol is text-based and has a large message size. Accordingly, due to the limited message size in the air section between the PPT PTT server and the terminal, when the text-based SIP message is transmitted without any processing, the time required for setting the initial call may be long.

Prior art methods of compressing text messages for transmission include parsing text strings and encoding numeric values into binary representations, which still contain text messages in the compressed message.

However, there is a problem that it is difficult to compress the SIP message to 15 bytes in the air section because it is limited to 15 bytes except for the message header between the server and the terminal in order to avoid a time delay during call setup.

The present invention has been made to solve the above problems, and when the PTT terminal and the PTT server performs a call setup process for initiating a PTT service, a PTT service system and a system of reducing the delay time for initial call setup It provides a call setup method.

In order to achieve the above object, in the present invention, when the PTT terminal and the PTT server perform a call setup process for initiating a PTT service, each SIP message to be transmitted and received between the PTT terminal and the PTT server for call setup is classified by type. The binary message is defined, and in the air section, the delay time according to call setup is reduced by exchanging the defined binary message.

Accordingly, the PTT terminal and the PTT server are SIP message processing units for processing SIP messages, binary messages for encoding SIP messages into predefined binary messages or converting binary messages into SIP messages corresponding to the binary messages during call setup. Each of the processor and the call setup process includes a message transmission processor configured to transmit a binary message in the air section and, once the call setup is completed, transmit the corresponding message to the counterpart in the form of a SIP message.

Each message transmission processor of the PTT terminal and the PTT server receives a binary message from the other party in the initial call setup process and transmits the message to the binary message processor. The binary message processor generates a SIP message by using the binary message type of the header information of the received binary message.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, let's define binary messages by type of SIP message.

The maximum size of a binary message varies depending on the message direction. The binary message has a maximum size of 15 bytes for a message sent by the terminal to a server and a maximum of 26 bytes for a server sent to a terminal.

In addition, in order to store the subscriber URI and the group URI used in the SIP message in the binary message, the subscriber information and the group information are managed in a database in the group list management server (GLMS), and the index information of the subscriber and the group is stored in the binary message. .

Table 1 shows an example of a configuration of a binary message header according to an embodiment of the present invention.

Referring to Table 1, the binary header information is assigned a 4-bit binary signature information field indicating that the message is a binary message, a binary message type information field indicating the type of the binary message, and a to tag of the SIP message. The information field is assigned 4 bits, the from tag information field of the SIP message is assigned 4 bits, the call id information field is assigned 3 bits, and the command sequence number (Cseq Number) information field is assigned 5 bits.

Here, it can be seen that the binary message type information field is configured to have a first to tenth type. In other words, the binary message type is defined from the first type to the tenth type.

The binary message may be defined in various forms according to the form of the PTT service. Here, the definition of some service forms will be described as an example.

2 shows an example of a binary message transmitted from a terminal to a PTT server according to the present invention.

Referring to FIG. 2, it can be seen that, as described in Table 1, 3 bytes are allocated as binary message headers, and information about subscribers to call and subscribers for other 12 bytes is stored.

Table 2 shows an example of the binary message defined in the present invention.

Referring to Table 2, binary messages are defined to have 10 types. Let's take a closer look at the ten types.

The first type of binary message corresponds to a case in which a terminal transmits a message from a terminal to a server. The binary message corresponds to a message transmitted to the PTT server to request a referer using a predetermined session.

The second type of binary message corresponds to a case in which a terminal transmits a message from a terminal to a server, and the terminal transmits a message for ad-hoc talk invite to the server.

The third type of binary message corresponds to a case in which a terminal transmits a message from a terminal to a server, and the terminal transmits a message to an PTT server for an instant group talk invitation.

The fourth type of binary message corresponds to a case in which a terminal transmits a message from a terminal to a server, and the terminal transmits a message to a PTT server for a chat group talk invite.

The fifth type of binary message corresponds to a case of transmitting a message from a terminal to a server and transmitting a message for a refresh INVITE for Session Timer.

The sixth type of binary message corresponds to a case of transmitting a message from a terminal to a server, for a message transmitted for an INVITE for joining the session.

The seventh type of binary message corresponds to a case of transmitting a message from a server to a terminal, for a message transmitted for an Ad-hoc talk INVITE (Mobile Termination).

The eighth type of binary message is a message transmitted from a server to a terminal, and corresponds to a message transmitted for an instant group talk invitation.

The ninth type of the binary message corresponds to a message transmitted from the terminal to the server for response.

The tenth type of binary message corresponds to a case of transmitting a message to a terminal to a server, which is transmitted for response.

In the terminal and the PTT server, when 10 types of SIP messages required in the call setup process are generated when performing the PTT service according to the binary message type setting rules shown in Table 2, the terminal and the PTT server are configured to transmit the corresponding message to the other party. The encoding process is performed according to the binary message type.

In this case, encoding to a binary message means that the binary message type information field is set in the binary message type information field. For example, if any message is a message sent from the terminal to the server and the terminal sends the message to the PTT server for Instant Group Talk Invite, the message is assigned to the binary message third type. This means that 3 is set in the binary message type information field in the header information of the message.

3 is a block diagram of a PTT service system according to the present invention.

Although the terminal and the PTT server are connected through an access network consisting of BTS, BSC, and PDSN as shown in FIG. 1, the access network section is briefly referred to as an air section, and the terminal and the PTT server exchange binary messages through the air section. Show that you give and receive.

Referring to FIG. 3, the terminal 100 generates an SIP message required to perform a PTT service or an application message processor 110 for interpreting a received SIP message, and PTT the SIP message generated by the application message processor 110. Binary message processing unit 120 for encoding a binary message for transmission to the server 200 or converting the binary message received from the PTT server 200 to a SIP message for transmission to the application message processing unit 110, PTT server Determining the type of the message received from the PTT server or transmits the SIP message or binary message received from the application message processing unit 110 and binary message processing unit 120 or the application message processing unit 110 and binary message processing unit 120. Message transmission processing unit 130 to transmit to (200), and binary message conversion for And a memory 140 for storing necessary binary conversion information.

The application processor 110 generates a SIP message required to perform the PTT service. At this time, the generated SIP message varies according to the type of PTT service, and the session termination message (INVITE) from the call setup request message (INVITE) for the terminal to call any terminal or call any group by accessing the PTT server 200 BYE) to generate a variety of SIP messages. In addition, the generated SIP message may include ID information of a corresponding called terminal for calling an individual terminal, or may include a plurality of terminal ID information when calling a plurality of terminals, and a group is set. If you want to call the terminals belonging to the corresponding group in may include the corresponding group ID information.

The message conversion processing unit 120 encodes the SIP message into a binary message or decodes the binary message into a SIP message in an initial call setup procedure to initiate a PTT service. Accordingly, the message conversion processor 120 includes an encoder 121 and a decoder 122. The encoder 121 performs a function of encoding a SIP message generated by the application message processing unit 110 into a corresponding binary message according to a defined binary message rule during an initial call setup procedure.

The decoder 122 performs a function of decoding the binary message received from the PTT server 200 through the message transmission processing unit 130 into the corresponding SIP message according to a predetermined binary message rule during the initial call setup procedure.

When any message is received, the message transmission processor 130 determines whether the corresponding message is a SIP message or a binary message, and transmits the message to the binary message processor 120 when the message is a binary message. Transmit to 110. In addition, the binary message received from the binary message processor 120 and the SIP message received from the application message processor 110 are transmitted to the PTT server 200 through the access network.

On the other hand, the PTT server 200 generates an SIP message required to perform the PTT service or the application message processing unit 210 for interpreting the received SIP message, and the SIP message generated by the application processing unit 210 to the terminal 100 Binary message processing unit 220 for encoding a binary message for transmission or a binary message received from the terminal 100 to the SIP message for transmission to the application message processing unit 210, and a message received from the terminal 100 Determines the form of the message and transmits it to the application message processor 210 and the binary message processor 220 or the SIP message or binary message received from the application message processor 210 and the binary message processor 220 to the terminal 100. Message transmission processing unit 230 and binary conversion necessary for binary message conversion It is configured to include a database 240 for storing information. Here, the database 240 includes subscriber and group information.

The application processor 210 generates or processes a SIP message required to perform a PTT service. At this time, the SIP message to be processed varies depending on the type of PTT service, the terminal 100 is connected to the PTT server 200 to call any terminal or call a group from a call setup request message (INVITE) session It handles a variety of SIP messages, ranging from termination messages (BYEs).

The message conversion processing unit 220 encodes the SIP message into a binary message or decodes the binary message into a SIP message in an initial call setup procedure to initiate a PTT service. Accordingly, the message conversion processor 220 includes an encoder 221 and a decoder 222. The encoder 221 encodes a SIP message generated by the application message processing unit 210 into a corresponding binary message according to a defined binary message rule during an initial call setup procedure.

The decoder 222 performs a function of decoding a binary message received from the terminal 100 through the message transmission processing unit 230 into a corresponding SIP message according to a predefined binary message rule during an initial call setup procedure.

When an arbitrary message is received from the terminal 100 through the access network, the message transmission processor 230 determines whether the corresponding message is a SIP message or a binary message, and when the message is a binary message, transmits the message to the binary message processor 220. If is transmitted to the application message processing unit 210. In addition, the binary message received from the binary message processor 220 and the SIP message received from the application message processor 210 are transmitted to the terminal 100 through the access network.

4 illustrates a procedure of encoding an arbitrary SIP message in a binary message processing unit of a PTT server according to the present invention.

First, when an arbitrary SIP message is received (S1), it is determined whether the method of the SIP message is an invite message (S2). If it is determined that the method is an invite message, it is determined whether a group ID exists in the from header (S3).

As a result of the determination, if the group ID exists, the message corresponds to the eighth type of the Instance Group Talk INVITE message having a direction from the server to the terminal according to the request for instant group talk. In the header information, 8 is encoded in the binary message type information field (S4).

On the other hand, if it is determined that the group ID does not exist, it is encoded into an Ad-hoc group talk invite binary message having a traveling direction from the server to the terminal (S5).

On the other hand, if the method determines that the message is not in bytes, it is determined whether the method is a status (S6). If it is determined that the method is a status, it is determined whether or not the 200 OK message for the device (S7).

If it is determined that the 200 OK message, the server encodes the 200 OK response binary message from the server to the terminal (S8). The binary message thus encoded is transmitted to the terminal (S9).

5 shows a decoding procedure in a PTT server according to the present invention.

Referring to FIG. 5, when a message is received (S11), it is determined whether the message is a binary message (S12). If the received message is a binary message as a result of the determination, it is decoded into an appropriate SIP message according to the binary message type shown in Table 2 (S13) and transmitted to the application message processor (S14). Meanwhile, as a result of determining whether the message is a binary message, if the message is not a binary message, the message is transmitted to the application message processing unit because the message is a SIP message.

6 shows the overall message transmission and reception procedure of the PTT service system of the present invention. In this case, in order to focus on the encoding process and decoding process between the SIP message and the binary message in the terminal and the PTT server, the interface between the terminal and the PTT server is omitted, and the application message processing unit, the binary message processing unit, and the PTT server of the terminal are briefly described. The operation between the application message processor and the binary message processor will be described in a limited manner.

Referring to Figure 6, the application message processing unit of the terminal generates a SIP message (INVITE) for call setup required to start the PTT service and transmits to the binary message processing unit (S21). The binary message processor encodes the SIP message INVITE received from the application message processor into a binary message INVITE and transmits the encoded SIP message INVITE to the PTT server through the network (S22). The binary message converter of the PTT server receives the binary message (INVITE) transmitted from the terminal, decodes it into a SIP message (INVITE), and transmits it to the application message processor (S23). Accordingly, the application message processor interprets the SIP message INVITE received from the binary message converter, generates a SIP message 200 OK accordingly, and transmits the SIP message 200 OK to the binary message processor (S24). The binary message processor encodes the SIP message 200 OK transmitted from the application message processor into a binary message and transmits it to the terminal through the network (S25). The binary message converter of the terminal receives the binary message 200 OK transmitted from the PTT server, decodes the SIP message 200 OK, and transmits the decoded SIP message 200 OK to the application message processor (S26).

This completes the call setup process required for the UE to start the PTT service. To summarize the process so far, when sending and receiving a message (INVITE, 200 OK) for call setup between the terminal and the PTT server, it is not sent and received in the form of SIP message, it is converted into a binary message form.

However, once call setup is completed, when a message is transmitted and received between the UE and the PTT server, the UE transmits and receives a SIP message.

For example, when the application message processing unit of the terminal transmits an invitation acceptance message (ACK) to the PTT server, the application message processing unit transmits the application message processing unit of the PTT in the form of a SIP message (ACK) without converting the binary message (S27).

In addition, even when the terminal transmits a reinvitation message (REINVITE) to the PTT server in a state in which a session is formed between the terminal and the PTT server, the terminal transmits the reinvitation message (REINVITE) to the application message processing unit of the PTT server in the form of a SIP message (REINVITE) without converting the binary message. (S28). Accordingly, when the application message processing unit of the PTT server transmits the response message 200 OK to the terminal, the application message processing unit transmits the response message 200 OK to the application message processing unit of the PTT of the terminal in the form of a SIP message 200 OK without converting the binary message (S29).

 In addition, even when the terminal transmits the termination message (BYE) to terminate the session maintained between the terminal and the PTT server, it transmits to the application message processing unit of the PTT server in the form of a SIP message (BYE) without undergoing conversion of binary messages ( S30).

Accordingly, when the application message processing unit of the PTT server also transmits the response message 200 OK to the terminal, the application message processing unit transmits the response message 200 OK to the application message processing unit of the PTT of the terminal in the form of a SIP message 200 OK without converting the binary message (S31).

According to the present invention, when providing a PTT service using a mobile communication access channel, it occurs due to the large size of the SIP message as a communication using a predefined binary message between the terminal and the proxy server without using the SIP message This can solve the delay problem of initial call setup.

1 is a configuration block diagram of a system for performing a general PTT service.

2 is an exemplary view of a binary message transmitted from a terminal to a PTT server according to the present invention.

3 is a block diagram of a PTT service system according to the present invention;

Figure 4 is a procedure for performing the encoding for any SIP message in the binary message processing unit of the PTT server according to the present invention.

5 is a diagram illustrating a decoding procedure in a PTT server according to the present invention.

6 is an overall message transmission and reception procedure of the PTT service system of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: terminal 110: application message processing unit

120: binary message processing unit 121: encoder

122: decoder 130: message transmission processing unit

140: memory 200: PTT server

210: application message processing unit 220: binary message processing unit

221: encoder 222: decoder

230: message transmission processor 240: database

Claims (27)

An application message processing unit for generating a SIP message necessary to perform a PTT service or interpreting a received SIP message; To encode a SIP message generated by the application message processor to a PTT server in an initial call setup procedure for performing a PTT service or to transmit a binary message received from the PTT server to an application message processor. A binary message processing unit that converts and processes the SIP message; Determines the type of message received from the PTT server and transmits it to the application message processing unit and the binary message processing unit, or the SIP message or binary message received from the application message processing unit and the binary message processing unit to the PTT server through the air section. PTT terminal including a message transmission processing unit for transmitting. The PTT terminal of claim 1, further comprising a memory configured to store binary conversion information necessary for binary message conversion. The PTT terminal of claim 1, wherein the initial call setup for performing the PTT service includes an INVITE procedure and a call setup request response procedure. The method of claim 1, wherein the binary message processing unit, PTT terminal performing encoding or decoding according to a conversion rule between a SIP message and a binary message. An application message processing unit for generating a SIP message necessary to perform a PTT service or interpreting a received SIP message; During the initial call setup procedure for performing the PTT service, the SIP message generated by the application processing unit is encoded into a binary message for transmission to the terminal, or the binary message received from the terminal is converted into a SIP message for transmission to the application message processing unit. A binary message processing unit for processing, Determining the type of the message received from the terminal to transmit to the application message processing unit and the binary message processing unit, or to transmit the SIP message or binary message received from the application message processing unit and the binary message processing unit to the terminal through the air section. PTT server including a message transmission processing unit. The method of claim 5, PTT server including a database for storing the binary conversion information necessary for the binary message conversion. The PTT server of claim 5, wherein the initial call setup for performing the PTT service comprises a call setup request (INVITE) procedure and a call setup request response procedure. The method of claim 5, wherein the binary message processing unit, PTT server that encodes or decodes according to the conversion rules between SIP and binary messages. The application message generated for the initial call setup of the PTT service is converted into a binary message according to a predefined binary message rule according to the message type and transmitted through an air segment, or the binary message received through the air segment is transmitted to the binary message. A PTT terminal performing an initial call setup procedure of converting an application message into a rule; Convert the binary message received through the air section from the terminal to the application message by the binary message rule, and converts the application message generated for initial call setup of the PTT service into a binary message by the binary message rule PTT service system comprising a PTT server to transmit to the terminal through the initial call setup procedure through. The method of claim 9, wherein the PTT terminal, An application message processing unit for generating a SIP message necessary to perform a PTT service or interpreting a received SIP message; To encode a SIP message generated by the application message processor to a PTT server in an initial call setup procedure for performing a PTT service or to transmit a binary message received from the PTT server to an application message processor. A binary message processing unit that converts and processes the SIP message; Determines the type of message received from the PTT server and transmits it to the application message processing unit and the binary message processing unit, or the SIP message or binary message received from the application message processing unit and the binary message processing unit to the PTT server through the air section. PTT service system including a message transmission processing unit for transmitting. The method of claim 9, wherein the PTT server, An application message processing unit for generating a SIP message necessary to perform a PTT service or interpreting a received SIP message; During the initial call setup procedure for performing the PTT service, the SIP message generated by the application processing unit is encoded into a binary message for transmission to the terminal, or the binary message received from the terminal is converted into a SIP message for transmission to the application message processing unit. A binary message processing unit for processing, Determining the type of the message received from the terminal to transmit to the application message processing unit and the binary message processing unit, or to transmit the SIP message or binary message received from the application message processing unit and the binary message processing unit to the terminal through the air section. PTT service system comprising a message transmission processing unit. The method of claim 9, Initial call setup for performing the PTT service, PTT service system including a call setup request (INVITE) procedure and a call setup request response procedure. 10. The method of claim 9, wherein the binary message is A PTT service system comprising a header including information for performing a PTT service and a body including information of a called terminal. The method of claim 9, PTT service system including a binary display information field indicating that the message is a binary message, and a binary message type information field indicating the type of the binary message. The PTT service system of claim 14, further comprising application message information. The method of claim 15, wherein the application message information, And at least one of a to tag information field of a SIP message, a from tag information field of a SIP message, a call id information field, and a command sequence number information field. The method of claim 14, wherein the binary message is of a type: PTT service system set according to the message transmission direction and the message operation. The method of claim 17, wherein the type of the binary message, In the case of transmitting a message from the terminal to the PTT server, the terminal transmits a message for requesting a referer (refer) using a predetermined session to the PTT server, In the case of transmitting a message from the terminal to the PTT server, the terminal transmits a message for the Ad-hoc Talk Invite to the server, In the case of transmitting a message from the terminal to the PTT server, the terminal transmits a message for the instant group talk invite (Instant Group Talk Invite) to the PTT server, A case in which a terminal transmits a message to a PTT server corresponds to a message transmitted by the terminal to a PTT server for a chat group talk invite. As a case of transmitting a message from the terminal to the PTT server and a message for the refresh INVITE for Session Timer, As a case of transmitting a message from the terminal to the PTT server, a message transmitted for the invitation for joining the session (INVITE for joining the session), As a case of transmitting a message from the PTT server to the terminal, a message transmitted for an Ad-hoc talk invitation (Ad-hoc talk INVITE (Mobile Termination)), As a case of transmitting a message from the PTT server to the terminal, a message transmitted for an Instant Group Talk INVITE; In the case of transmitting a message from the terminal to the PTT server, the message transmitted for the response (Response), PTT service system for transmitting a message to the terminal to the PTT server including at least one or more of the message to transmit for the response (Response). The method of claim 13, wherein the information on the called terminal is PTT service system including index information corresponding to subscriber information or group information of the called terminal. The method of claim 9, wherein the binary message, The size of the binary message transmitted from the terminal to the PTT server is 15 bytes, the size of the binary message transmitted from the PTT server to the terminal is 26 bytes. Determining whether an application message generated to perform a PTT service is an initial call setup message; If it is determined that the application message is the initial call setup message, the process of performing the initial call setup procedure by converting the binary message into the corresponding binary message by the predefined binary message rule according to the message type and transmitting it to the PTT server through the air section; , Determining whether the message is a binary message when an arbitrary message is received from the PTT server through the air section; And determining that the message is a binary message, converting the application message into a corresponding application message according to the binary message rule, and performing an initial call setup procedure according to the message. The method of claim 21, If it is determined that the initial call setup message, the application message is not the initial call setup message, the call setup of the PTT terminal further comprising the step of transmitting the application message to the PTT server through the air section to perform the initial call setup procedure Way. The method of claim 21, And determining that the message is a binary message, if the message is not a binary message, performing the initial call setup procedure according to the application message. Determining whether an application message generated to perform a PTT service is an initial call setup message; Determining that the application message is an initial call setup message, converting the binary message to a corresponding binary message according to a predefined binary message rule according to the type of the message and transmitting the same to the terminal through an air section; Determining whether the message is a binary message when an arbitrary message is received from the terminal through an air section; And determining that the message is a binary message, converting the application message into a corresponding application message according to the binary message rule, and performing an initial call setup procedure according to the message. The method of claim 24, If it is determined that the initial call setup message, the application message is not the initial call setup message, the call setup of the PTT server further comprising the step of performing the initial call setup procedure by transmitting the application message to the terminal through the air section; Way. The method of claim 24, And determining that the message is a binary message, if the message is not a binary message, performing an initial call setup procedure according to the application message. Transmitting, by the PTT terminal, the application message generated for initial call setup of the PTT service to a binary message according to a predefined binary message rule according to the message type, and transmitting the binary message to the PTT server through an air section; The PTT server converting the binary message received through the air section from the terminal into an application message by the binary message rule and performing an initial call setup procedure accordingly; Performing, by the PTT server, an application message generated for initial call setup of a PTT service, converted to a binary message by the binary message rule, and transmitted to the terminal through an air section to perform an initial call setup procedure; And performing, by the terminal, an initial call setup procedure for converting a binary message received from the PTT server into an application message by the binary message rule through the air section.