KR100397922B1 - Method For Interoperating VoIP Gateways - Google Patents

Abstract

The present invention discloses a VoIP gateway operating method. According to this, if the non-start start procedure is performed and the call setup request or answering message from the originating gateway has the IP address of the H.245 control port, it waits for a call connect message. By opening and connecting the H.245 channel in advance, as in the case of a call connect message, it modifies the terminal capabilities, master-slave nego, open logic channels, etc. before the call is answered. Therefore, the voice channel is opened immediately after the calling station gateway receives a call connection message indicating that the call is received from the terminal device connected to the called station gateway. As a result, the call can be made immediately after the opening of the voice channel.

Description

Method for Interoperating VoIP Gateways

The present invention relates to a VoIP gateway operating method, and more particularly, to a VoIP gateway operating method for preventing the phenomenon that a call cannot be made during a certain waiting time even after receiving a call.

At present, with the rapid development of communication technology, the transmission of wireless voice signals such as the transmission of voice signals using PDAs (Personal Digital Assistants), cellular phones, or cellular phones, or the transmission of voice signals using satellites is becoming practical. to be. In addition, in recent years, a technology for transmitting voice signals to a network configured for data transmission, such as the Internet, for example, Voice Over Internet Protocol (VoIP), Voice Over Frame Relay (VoFR), and Voice Over Asynchronous Transfer Mode (VOATM) The implementation of technologies such as Voice Over Digital Subscriber Loop (VODSL) enables high-speed transmission of voice signals.

Current Private Branch Exchanges (PBXs) are not only used for inter-extension calling services, but also for public switched telephone networks (PSTN), integrated services digital networks (ISDN), asynchronous transfer mode (ATM), and Internet Protocol (IP). It is being developed to provide broadband multimedia communication service by connecting to a communication network such as Digital Subscriber Loop (DSL) or Digital Subscriber Loop (DSL). Among them, the technology of transmitting voice signals and data signals together over the Internet has been in the spotlight by using VoIP technology for transmitting voice signals using IP.

The call setup process for communication between the conventional VoIP gateway is performed as shown in FIG. Here, the originating station VoIP gateway supports both a fast start and a non-fast start operating mode, and the called station VoIP gateway does not support the fast start operating mode.

That is, when any terminal device (not shown) connected to the originating station VoIP gateway attempts an off hook to request a call setup in FIG. 1, the originating station gateway sends a call setup request message to the called station. Send to the gateway.

After the called station gateway receives the call establishment request message, the called station gateway transmits a ring signal, which is a call signal, to a corresponding terminal device (not shown) connected in the called station gateway. At the same time, the destination station gateway sends an answering message for attempting to connect to the calling station gateway.

When the originating station gateway receives the response message, it transmits a ring back tone signal, which is a call confirmation signal, to a corresponding terminal device that has requested the call setup connected to the originating station gateway.

At this time, in the non-start start mode, when the terminal device receiving the ring signal, which is the call signal, is off-hook from the destination station gateway, an H.245 message for billing processing is processed while the other party receives the call. Additional handling of H.245 Transmission Control Protocol (TCP) connections such as control channel access, terminal capability exchange, master-slave nego, and open logic channel do.

After the H.245 protocol is opened to open the H.245 protocol while receiving the call, the calling station gateway and the destination gateway use RTP (Real Time Protocol) or RTCP (Real Time Control Protocol). You talk to each other.

However, conventionally, when an originating station VoIP gateway that supports both fast start and non-fast start operating modes connects to a destination VoIP gateway that does not support the fast start operating mode, the H.323 stack is used. After connecting this H.225 channel to send and receive call setup, call processing, answering message, etc., it connects the H.245 control channel only when the call connect message is received while the other party is actually receiving the call. .

In this case, it takes a lot of time to connect, terminal capability, master slave nego, open logical channel and so on. Thus, there is a problem in that even after the other party receives the call, the user cannot hear each other by the delay time of A and B of FIG. 1.

Accordingly, an object of the present invention is to provide a method for operating a VoIP gateway that enables a quick call without waiting time after opening a voice channel.

Another object of the present invention is to provide a VoIP gateway operating method for enhancing interworking between an originating gateway and a destination gateway.

1 is an operation diagram showing a VoIP gateway operating method according to the prior art.

2 is an operation diagram showing a VoIP gateway operating method according to an embodiment of the present invention.

3 is an operation diagram showing a VoIP gateway operating method according to another embodiment of the present invention.

VoIP gateway operation method according to the present invention for achieving the above object is

Determining, at the destination gateway, whether the call establishment request message from the originating station gateway includes the H.245 address;

If it is determined that the H.245 address is included, making an H.245 TCP connection from the destination station gateway to the address and transmitting an H.245 message to the calling station gateway; And

And transmitting a call access message from the called station gateway to the calling station gateway.

In addition, the VoIP gateway operating method according to another embodiment of the present invention

Determining, at the originating gateway, whether the H.245 address is included in the answering message from the terminating gateway;

If it is determined that the H.245 address is included, making an H.245 TCP connection from the source gateway to the address and transmitting an H.245 message to the destination gateway; And

And transmitting a call access message from the called station gateway to the calling station gateway.

Hereinafter, a VoIP gateway operating method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 2, first, when an early H.245 mode of Fast Start Not Used is enabled at an originating VoIP gateway and a destination VoIP gateway, any terminal device connected to the calling VoIP gateway is enabled. (Not shown) attempts an off hook to request a call setup and the calling station gateway sends a call setup request message to the called station gateway. In this case, the call setup request message includes the H.245 address of the originating gateway.

After the called station gateway receives the call establishment request message, it is determined whether the IP address of the H.245 control port is included in the call establishment request message. In this case, when it is determined that the H.245 address is included, the destination station gateway performs an H.245 TCP connection to the H.245 address and accesses a control channel for processing an H.245 message for billing processing. Perform H.245 Transmission Control Protocol (TCP) connection handling procedures such as Terminal Capability exchange, Master-Slave Nego, and Open Logical Channel. This is to enable real call without delay as soon as the voice channel is opened.

Thereafter, the called station gateway transmits a ring signal, which is a call signal, to a corresponding terminal device (not shown) connected in the called station gateway. At the same time, the destination station gateway sends an answering message for attempting to connect to the calling station gateway.

After the originating station gateway receives the answering message, it transmits a ring back tone signal, which is a call confirmation signal, to a corresponding terminal device that has requested the call setup connected to the originating station gateway.

Thereafter, when the terminal device receiving the ring signal, the call signal, received from the called station gateway makes an off-hook, the called station gateway transmits a call connect message to the calling station gateway and immediately establishes a voice channel. Open it. At this time, the originating station gateway and the called station gateway can communicate with each other using Real Time Protocol (RTP) and Real Time Control Protocol (RTCP).

Accordingly, the present invention can make a real call without a delay time as soon as the H.245 voice channel is opened, unlike the conventional method where a real call is possible after a certain delay time has elapsed since the H.245 voice channel was opened.

Hereinafter, a method of operating a VoIP gateway according to another embodiment of the present invention will be described with reference to FIG. 3. When the alert H.245 mode is enabled in the calling station VoIP gateway and the called station VoIP gateway, the VoIP gateway is connected to the calling station VoIP gateway. Any terminal device (not shown) attempts an off hook to request a call setup and the calling station gateway transmits a call setup request message to the called station gateway.

After the called station gateway receives the call establishment request message, the called station gateway transmits a ring signal, which is a call signal, to a corresponding terminal device (not shown) connected in the called station gateway. At the same time, the destination gateway sends a Q.931 Alerting message to the originating gateway to attempt to connect the call. In this case, the answering message includes an IP address of an H.245 control port.

After the originating station gateway receives the response message, it transmits a ring back tone signal, which is a call confirmation signal, to a corresponding terminal device requesting the call setup, connected to the originating station gateway.

In addition, it is determined whether the IP address of the H.245 control port is included in the response message. At this time, if it is determined that the IP address of the H.245 control port is included, the calling station gateway does not wait for a Q.931 call connect message to be received from the called station gateway. The H.245 channel is opened in advance by performing an H.245 TCP connection to the H.245 address as received from the destination station gateway.

In addition, control channel access, terminal capability exchange, Master-Slave Nego, and Open Logic Channels (Open) to handle H.245 messages for billing processing before the other party answers the call. H.245 Transmission Control Protocol (TCP) connection processing procedures such as Logical Channel are performed in advance. This is because the called station gateway transmits a call connect message to the calling station gateway and opens a voice channel so that a real call can be made without delay as soon as the voice channel is opened.

Thereafter, when the terminal device receiving the ring signal, the call signal, received from the called station gateway makes an off-hook, the called station gateway transmits a call connect message to the calling station gateway and immediately establishes a voice channel. Open it. At this time, the originating station gateway and the called station gateway can communicate with each other using Real Time Protocol (RTP) and Real Time Control Protocol (RTCP).

Accordingly, the present invention can make a real call without a delay time as soon as the H.245 voice channel is opened, unlike the conventional method where a real call is possible after a certain delay time has elapsed since the H.245 voice channel was opened.

As described above, the VoIP gateway operating method according to the present invention performs a non-start start procedure and if the call setup request message or the answering message from the originating gateway includes the IP address of the H.245 control port. By opening and connecting the H.245 channel in advance, as if a call connect message was received, instead of waiting for a call connect message, terminal capability, master-slave negotiation, and open logic Change the procedure such as channel in advance. Therefore, the voice channel is opened immediately after the calling station gateway receives a call connection message indicating that the call is received from the terminal device connected to the called station gateway. As a result, the call can be made immediately after the opening of the voice channel.

On the other hand, the present invention is not limited to the contents described in the drawings and the upper description, it is obvious to those skilled in the art that various forms of modifications can be made without departing from the spirit of the invention. .

Claims (2)

Determining, at the destination gateway, whether the call establishment request message from the originating station gateway includes the H.245 address; If it is determined that the H.245 address is included, making an H.245 TCP connection from the destination station gateway to the address and transmitting an H.245 message to the calling station gateway; And And transmitting a call connection message from the called station gateway to the calling station gateway. Determining, at the originating gateway, whether the H.245 address is included in the answering message from the terminating gateway; If it is determined that the H.245 address is included, making an H.245 TCP connection from the source gateway to the address and transmitting an H.245 message to the destination gateway; And And transmitting a call connection message from the called station gateway to the calling station gateway.