KR101330246B1 - VoIP terminal, Method for transferring media data in VoIP terminal, and Session Border Controller for VoIP terminal - Google Patents

Abstract

The present invention relates to an internet phone terminal, a method for transmitting media data in an internet phone terminal, and a session border controller for an internet phone. The method for transmitting media data in an internet phone terminal according to an embodiment of the present invention includes: Transmitting Internet dial-up signaling to a receiving terminal through a session border controller of its own network; transmitting, by the session border controller, address information of one or more relay terminals assigned to the calling terminal to the receiving terminal; Transmitting the address information of at least one relay terminal assigned to the receiving terminal to the calling terminal, and using the relay terminals assigned to the calling and receiving terminals as media relays, respectively, media data of the calling terminal or the receiving terminal. Send or Subject is a step. As a result, the media data can be efficiently transmitted.

Internet Phone, SBC, Media Data, Transmission

Description

Internet terminal, method for transferring media data in VoIP terminal, and session border controller for VoIP terminal

The present invention relates to an internet phone terminal, a method for transmitting media data in an internet phone terminal, and a session border controller for an internet phone. More particularly, the present invention relates to an internet phone terminal and an internet phone terminal capable of efficiently transmitting media data. A method of transmitting media data and a session border controller for an internet telephone.

The present invention is derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Telecommunications Research and Development. )].

Internet telephone terminals are terminals for transmitting and receiving voice and video data. However, if such an Internet phone terminal is in a private router, private IP (Internet Protocol) is used, and thus, it is impossible to provide a smooth call.

To this end, the International Organization for Standardization seeks to solve this problem through standardization and technology provision through methods such as Session Traversal Utilities for NAT (STUN), Universal Plug and Play (UPnP), Traversal Using Relay NAT (TURN), and Interactive Connectivity Establishment (ICE). Doing. However, it is not a perfect solution because there are so many types of routers and different operation methods.

In this environment, three approaches are currently used to provide Internet telephony services.

 Firstly, the Internet phone terminal receives the public network IP directly. Secondly, the terminal can use the public network IP through a router function such as Super DMZ or Double IP. Border Controller (SBC) is installed in the operator's network so that users in NAT (Network Address Translation) environment can talk smoothly.

However, if the terminal directly receives a public network IP or uses a public network IP through a router function, there is no problem in providing a service, but all Internet telephone terminals are not considered to be in this situation.

In addition, when SBC is used, operators add SBC-type equipment to the operator's network to allow all traffic to pass through the equipment, so that the service can be smoothly exceeded when the capacity of the SBC is exceeded. There is a problem that cannot be provided.

 An object of the present invention is to provide an internet telephone terminal capable of efficiently transmitting media data, a method of transmitting media data in an internet telephone terminal, and a session border controller for an internet telephone. .

In accordance with another aspect of the present invention, there is provided a method for transmitting media data of an integrated Internet telephone terminal, wherein the calling terminal transmits Internet dial-up signaling to a receiving terminal through a session border controller of a subscriber network. And transmitting, by the session border controller, address information of at least one relay terminal assigned to the calling terminal to the receiving terminal, and sending, by the session border controller, address information of at least one relay terminal assigned to the receiving terminal. And transmitting or receiving media data of a calling terminal or a receiving terminal using a relay terminal assigned to the calling and receiving terminals as a media relay, respectively.

In addition, the Internet telephone terminal according to an embodiment of the present invention for achieving the above-described and other objects, and transmits the Internet dial-up signaling to be transmitted to the receiving terminal through the session border controller of the subscriber network, and from the session border controller Receives address information of a relay terminal assigned to a receiving terminal, and transmits or receives media data using at least one relay terminal assigned to a transmitting terminal and at least one relay terminal assigned to a receiving terminal as a media relay.

In addition, the Internet telephone terminal according to an embodiment of the present invention for achieving the above-described and other objects, and receives the Internet telephone connection signaling from the calling terminal device to transmit to the receiving terminal, at least one relay assigned to the calling terminal The terminal transmits address information of the terminal to the receiving terminal, and transmits address information of one or more relay terminals assigned to the receiving terminal to the calling terminal.

According to an embodiment of the present invention, an internet phone terminal, a method for transmitting media data in an internet phone terminal, and a session border controller for an internet phone, transmit media data efficiently by sharing a media relayable terminal to transmit media data. It becomes possible.

In particular, since the position of the relay terminal of the media data is located in the public network, it is possible to significantly reduce the problems caused by concentrating all traffic to the session border controller (SBC) while providing the Internet telephone service.

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

1 is a diagram illustrating a media relay method in an SBC-based Internet telephone system.

Referring to the drawings, the session border controller (SBC) -based Internet telephone system 100, the Internet telephone terminal X 115 and NAT 118 is disposed in the first private network 110, the operator network ( The session border controller (SBC) 120 may be disposed in the 130, and the Internet telephone terminal Y 155 and the NAT 158 may be disposed in the second private network 150.

Session Initiation Protocol (SIP) may be used as the signaling for Internet dial-up from Internet phone terminal X115.

Such SIP includes NAT 118 in the first private network 110, SIP Back-to-Back User Agents (B2BUA) 123 in the session border controller (SBC) 120, and NAT in the second private network 150. Via 158, it is transmitted to the Internet telephone terminal Y 155.

On the other hand, the multimedia data such as audio and video is transmitted through the media relay server group 126, not the SIP back-to-back user agents (B2BUA) 123 in the session border controller (SBC) 120, and the Internet. It is transmitted between telephone terminal X 115 and Internet telephone terminal Y 155.

As such, when SIP and multimedia data are transmitted through the session border controller (SBC) 120 in the operator network 130, call quality depends on the capacity of the session border controller (SBC).

2 is a diagram showing the configuration of an Internet telephone system according to an embodiment of the present invention.

Referring to the drawings, a session border controller (SBC) -based Internet phone system 200 according to an embodiment of the present invention, the first private network 210, the operator network 230, the second private network 250, And an authorized network 270.

The first private network 210 includes an internet telephone terminal X 215 and a NAT 218.

NAT 218 is an address translator of a communication network that changes the private IP address of the first private network 210 into a public IP address. This use of NAT 218 can save the public IP address of the Internet, and can protect the private network intrusion of users connected to the public network, such as the Internet.

Session Initiation Protocol (SIP) may be used as the signaling for Internet telephony of the Internet telephone terminal X 215.

SIP is an application layer signaling protocol for establishing, modifying and terminating sessions for multimedia communication, and is used together with other protocols. SIP can be transmitted including a Session Description Protocol (SDP) that describes the characteristics of the session to create a session, and can be easily integrated with other services such as P2P networks.

In the figure, such a SIP includes a NAT 218 in a first private network 210, SIP back-to-back user agents (B2BUA) 223 in a session border controller (SBC) 220, and a second private network 250. Is transmitted to the Internet telephone terminal Y 255 via the NAT 258 in the parentheses).

On the other hand, multimedia data such as voice and video is transmitted using at least one of the plurality of Internet telephone terminals 275, 280, 285, 290 in the authorized network 270. That is, the multimedia data is transmitted by using the media relay function of the plurality of Internet telephone terminals 275, 280, 285 and 290. The multimedia data may be divided and transmitted sequentially or non-sequentially according to the number of media relay capable internet telephone terminals. On the other hand, the multimedia data may be transmitted through the media relay server group 226 in the session border controller (SBC) 220 in addition to the media relay capable internet telephone terminals 275, 280, 285 and 290.

On the other hand, for multimedia data transmission, Realtime Transfer Protocol (RTP) or Transmission Control Protocol (TCP) may be used.

As such, when the media data is transmitted, at least one of the plurality of Internet telephone terminals 275, 280, 285, and 290 in the authorized network 270 is used as a media relay, thereby providing a session border controller (SBC) 220 of the operator network 230. ) To properly distribute the traffic weighted to the equipment.

On the other hand, the media relay capable internet telephone terminals 275, 280, 285, and 290 may perform the relay of voice data for a telephone call in addition to the media data. Such voice data may be transmitted in a sequential or non-sequential manner through a media relay capable internet telephone terminal 275, 280, 285, 290, in addition to the session border controller (SBC) 220.

The provider network 230 includes a session border controller (SBC) 220. The session border controller (SBC) 220 is located at the border of the operator's network 230 and handles signaling for Internet telephony connection and the like.

The provider network 230 may include SIP B2BUA (SIP Back-to-Back User Agents) 223 and a media relay server group 226.

The SIP B2BUA 223 is a type of SIP proxy server. The SIP B2BUA 223 manages state information on the transmission in the session, and may also perform address translation and routing control. That is, when setting up a call between two user agents, each user agent can be called individually and then the two user agents can be connected.

As shown in the figure, the SIP B2BUA 223 uses the NAT 258 in the second private network 250 as a signaling for Internet telephony from the Internet phone terminal X 215 in the first private network 210. Is transmitted to the Internet telephone terminal Y (255).

On the other hand, although not shown in the figure, it may further include an MRMS (Media Relay Management Server) 239. The MRMS 239 manages connection information between the terminal and the terminal for media relay. For example, a media relay list including media relay capable internet telephone terminals 275, 280, 285 and 290 may be managed.

The second private network 250 includes an internet telephone terminal Y 255 and a NAT 258. The Internet phone terminal Y 255 is used for reception and exchanges SIP with the Internet phone terminal X 215 through the SBC 220, and transmits at least one of the plurality of Internet phone terminals 275, 280, 285, 290 of the authorized network 270. Through this, media data is exchanged.

The authorized network 270 includes a plurality of Internet telephone terminals 275, 280, 285, 290. Since the plurality of Internet telephone terminals 275, 280, 285, and 290 are located in the authorized network 270, they may not go through the above-described NAT. In this way, by performing a media relay function using the plurality of Internet telephone terminals 275, 280, 285, 290, it is possible to efficiently transmit media data. Meanwhile, any one of the plurality of Internet telephone terminals 275, 280, 285, and 290 may be in a call with another terminal during media relay.

3 is a diagram illustrating the flow of Internet telephony signaling and media data according to an embodiment of the present invention.

Referring to the drawings, since the Internet telephone system 200 of FIG. 3 is the same as described with reference to FIG. 2, the following description will focus on the flow of signaling and media data.

First, when the Internet telephone terminal X 215 boots, the Internet telephone terminal X 215 receives a private IP and sends a "REGISTER" message to the session border controller (SBC) 220 of the operator network 230 to which it has subscribed. Transmit (S310). At this time, the contact header of the “REGISTER” message has the IP of the first private network 210.

Next, the session border controller (SBC) 220 receiving the "REGISTER" message determines whether the message is from the private network 210 or the public network. The criterion for determination is the value of the Contact header.

If it is determined that the private network 210 is from, the session border controller (SBC) 220 transmits a message to the private network 210 that registration is completed (S315). When the session border controller (SBC) 220 sends a “200 OK” response message indicating that the registration is completed, the session border controller (SBC) 220 is located in the authorized network 270 to the corresponding Internet telephone terminal X 215 in the first private network 210 and the media data. It informs network information (IP, Port) of terminals having a function of relaying (for example, Internet telephone terminal A 275 and Internet telephone terminal B 280). In this case, the information of the media relay peer (MRP) may be plural.

Next, the Internet phone terminal X 215 transmits an “Attach Request” message to address information of the relay terminal (MRP) included in the received “200 OK” response message (S320). For example, an "Attach Request" message is sent to the address information of the Internet phone terminal A 275 and the Internet phone terminal B 280.

The relay terminal (MRP) receiving the “Attach Request” message secures the channel of the requesting terminal 255 and completes the attachment with the terminal 255 to the media relay management server (MRMS) 229. Notify that (S325). For example, the Internet phone terminal A 275 and the Internet phone terminal B 280 inform the media relay management server (MRMS) 229 that the attachment is completed.

Next, the relay terminal (MRP) informs the requesting terminal 215 that channel mapping is completed (S330). For example, the Internet phone terminal A 275 and the Internet phone terminal B 280 inform the Internet phone terminal X 215 that channel mapping is completed.

Next, the user terminal 215 periodically transmits an "Attach Refresh" message to the relay terminal (MRP) (S335). This is to prevent the mapping information in the NAT 218 where the user terminal 215 is located from being removed due to timeout. In the figure, Internet telephone terminal X 215 shows an "Attach Refresh" message sent to Internet telephone terminal A 275 and Internet telephone terminal B 280. As shown in FIG.

In response to the “Attach Refresh” message, the relay terminal MRP transmits an “Attach Response” response message to the user terminal 215 (S340).

It is also possible to send in the reverse direction. That is, the relay terminal MRP sends an “Attach Refresh” message to the user terminal 215, and in response, the user terminal 215 may transmit an “Attach Response” response message to the relay terminal MRP. .

Next, when the user makes a phone call, an "INVITE" message is transmitted from the calling terminal 215 to the session border controller (SBC) 220 (S360).

The session border controller (SBC) 220 describes the address information of the relay terminal (MRP) connected to the corresponding calling terminal 215 in the Session Description Protocol (SDP) to receive the receiving terminal 255 in the second private network 250. Send to (S365). As described above, address information of the Internet telephone terminal A 275 and the Internet telephone terminal B 280 in the authorized network 270 is sent to the receiving terminal 255 to the relay terminal MRP.

Next, when the receiving terminal 255 receives a call, the receiving terminal 255 transmits a "200 OK" message to the session border controller (SBC) 220 (S370).

Next, the session border controller (SBC) 220 receiving the “200 OK” message transmits the address information of the relay terminal (MRP) assigned to the receiving terminal 255 before transmitting it to the calling terminal 215. OK ”message is included in the SDP and transmitted (S375). In the figure, the Internet phone terminal C 285 and the Internet phone terminal D 290 are illustrated as relay terminals (MRPs) assigned to the reception terminal 255.

Next, the originating terminal 215 transmits an "ACK" message to the session border controller (SBC) 220 (S380), and the session border controller (SBC) 220 sends an "ACK" message to the receiving terminal 255. Transmit (S385).

The receiving terminal 255 and the calling terminal 215 send media data via the relay terminals MRP. The RTP packets are sequentially or non-sequentially distributed to the relay terminals MRP. When the total number of attached relay terminals (MRP) is N, RTP packets are sequentially delivered to N relay terminals (MRP).

Media data is delivered in RTP, which receives this value from multiple MRPs. To this end, the RTP data received from the RTP buffer of the media receiver is arranged based on the sequence number described in the RTP header.

4 is a diagram illustrating an example of information in a relay terminal.

Referring to the drawings, the relay terminal (MRP) has an Incoming Port, Outgoing IP, Outgoing Port information, etc. in order to maintain the mapping information. It also has Refresh Timer information for each record. The Refresh Timer information prevents the mapping information from the NAT from disappearing. In addition, it may further have Served PKT information. Served PKT information is the total amount of media data that provides a media relay, which may be provided to the ITSP operator. This information may be used for billing and management at the operator side, or may be used to compensate in the form of an intangible form for a user who provided a relay terminal (MRP) function.

5 is a diagram illustrating the flow of Internet telephony signaling and media data in connection with the present invention.

Referring to the drawings, the flow of Internet telephony signaling and media data in FIG. 5 illustrates a case in which smooth service provision is not performed, as described in FIG.

In the process of sending the RTP data to the various relay terminals (MRP) by the calling terminal 215, if the specific relay terminal (MRP) is no longer able to provide a service receives an "ICMP" message. In the figure, the calling terminal 215 sends RTP data to the Internet telephone terminal C 285 (405) and also sends 410 RTP data to the other Internet telephone terminal D 290 (410). At this time, when the Internet phone terminal D 290 is no longer able to provide a service, the Internet phone terminal D 290 transmits an “ICMP” message to the calling terminal 215 (415). At this time, the originating terminal 215 sends a "fail" message to the session border controller (SBC) 220 (420). The media relay management server (MRMS) of the session border controller (SBC) 220 receiving this information receives the relay terminal (MRP) (for example, the Internet telephone terminal C (285)) from the relay terminal list (MRP list). Remove As a result, the calling terminal 215 turns the stream sent to the Internet telephone terminal C 285 to another Internet telephone terminal D 290.

On the other hand, when the calling terminal 215 sends RTP data to the Internet telephone terminal C 285 (425) and also sends (430) RTP data to another Internet telephone terminal D 290, the Internet telephone terminal D 290. When service is no longer available, the receiving terminal 255 may directly transmit a “RTCP” (REAL TIME CONTROL PROTOCOL) message to the calling terminal 215 (435). At this time, the originating terminal 215 sends a "fail" message to the session border controller (SBC) 220 (440). The media relay management server (MRMS) of the session border controller (SBC) 220 receiving this information sends a relay terminal (MRP) (for example, an Internet telephone terminal C (285)) to a relay terminal list (MRP list). Remove from As a result, the calling terminal 215 turns the stream sent to the Internet telephone terminal C 285 to another Internet telephone terminal D 290.

Then, when the receiving terminal 255 sends a re-REGISTER due to a registration timeout, new relay terminals (MRPs) are allocated. For example, the Internet phone terminal D 290 and the Internet phone terminal E (not shown) may be allocated.

In this way, except for the media relay terminal which is abnormal during the media relay, by using other media relay capable terminals, not only the transmission stability of the media data but also the call quality can be stably maintained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

1 is a diagram illustrating a media relay method in an SBC-based Internet telephone system.

2 is a diagram showing the configuration of an Internet telephone system according to an embodiment of the present invention.

3 is a diagram illustrating the flow of Internet telephony signaling and media data according to an embodiment of the present invention.

4 is a diagram illustrating an example of information in a relay terminal.

5 is a diagram illustrating the flow of Internet telephony signaling and media data in connection with the present invention.

Claims (14)

Sending, by the calling terminal, the Internet dial-up signaling to the receiving terminal through the session border controller of the subscriber network; Transmitting, by the session border controller, address information of at least one relay terminal assigned to the calling terminal to the receiving terminal; Transmitting, by the session border controller, address information of at least one relay terminal assigned to the receiving terminal to the calling terminal; And And transmitting or receiving media data of the calling terminal or the receiving terminal using a relay terminal assigned to the calling and receiving terminals as a media relay, respectively. And said relay terminal is an internet telephone terminal located in an authorized network. The method of claim 1, And notifying, by the session border controller, of the terminal information capable of media relay to the calling terminal, the media data transmission method of the Internet telephone terminal. The method of claim 1, Sending, by the calling terminal, an attach request message to the media relay terminal; Acquiring, by the media relay terminal, a channel and notifying the session border controller of a connection completion message; And And transmitting, by the media relay terminal, notifying the calling terminal of the completion of channel mapping. The method of claim 1, And the media data is divided and transmitted to the relay terminal. The method of claim 1, When a media call is initiated by a voice call and one of the assigned relay terminals is not capable of media relay while the media data is being transmitted, an Internet telephone, characterized by transmitting or receiving the media data through another media relay terminal. Method of transmitting media data of a terminal. The method of claim 1, And when the media relay terminal of one of the assigned relay terminals is not capable of media relay, notifying, by the calling terminal, a failure message to the session border controller; Media data transfer method. The method of claim 1, And transmitting or receiving voice data of the calling terminal or the receiving terminal by using a relay terminal assigned to the calling and receiving terminals, respectively. The method of claim 7, wherein And the voice data is divided and transmitted to the relay terminal. At least one relay terminal assigned to the transmitting terminal, transmitting Internet dial-up signaling to be transmitted to the receiving terminal through the session border controller of the subscriber network, receiving address information of the relay terminal assigned to the receiving terminal from the session border controller. And transmitting or receiving media data using at least one relay terminal assigned to the receiving terminal as a media relay, The relay terminal is an internet phone terminal, characterized in that the Internet phone terminal located in the public network. 10. The method of claim 9, And when one of the assigned relay terminals is not capable of media relay, transmits or receives data of the media data through another media relay terminal. 10. The method of claim 9, Internet telephone terminal, characterized in that for transmitting or receiving voice data using the relay terminal. delete Receives Internet dial-up signaling from a calling terminal device and transmits it to a receiving terminal, transmits address information of at least one relay terminal assigned to the calling terminal to the receiving terminal, and addresses of at least one relay terminal assigned to the receiving terminal. Send information to the calling terminal, The relay terminal is a session border controller for an Internet phone, characterized in that the Internet phone terminal located in the public network. 14. The method of claim 13, And if the media relay terminal of any one of the assigned relay terminals is not capable of media relay, removes the relay terminal from the relay terminal list.

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