15 results about "NAT traversal" patented technology

The invention discloses a player of a cable television RTP (Real-time Transport Protocol) stream protocol, which comprises a path analysis module used for acquiring a source address and a destination address of an RTP stream and carrying out network path analysis; the NAT traversal processing module is used for judging whether NAT traversal processing needs to be carried out or not based on the network path analysis result; the information acquisition module is used for acquiring an external IP address and port information by adopting an STUN technology when NAT traversal processing needs to be carried out; the NAT traversal channel establishing module is used for establishing an NAT traversal channel by utilizing the acquired external IP address and port information; and the RTP stream transmission module is used for transmitting the RTP stream through the established NAT traversal channel so as to ensure the stability of cross-subnet transmission. According to the invention, the problem that the RTP stream cannot be received due to NAT penetration failure under the condition of cross-subnet transmission can be solved.

The invention relates to the technical field of video return, in particular to an unmanned vehicle video return control method and system based on an SIP (Session Initiation Protocol) communication protocol. The control method comprises the steps that a home terminal serves as an SIP client and sends an SIP connection request to an unmanned vehicle terminal through TLS encryption, it is determined that the home terminal is a video only decoding terminal and the unmanned vehicle terminal is a video only coding terminal, meanwhile, the audio two-way communication capacity is negotiated, and encrypted signaling connection is established. As a mature multimedia communication protocol, the SIP has a perfect and safe session establishment, modification and termination mechanism. The method has good network adaptability, supports NAT traversal and firewall traversal, can stably work in different network environments, and is suitable for unmanned vehicle moving scenes. According to the invention, by constructing a systematized control scheme based on the SIP protocol, the problems of dynamic bandwidth adaptation and safe and reliable transmission control of unmanned vehicle video return in a complex network environment are solved.

This application provides a method for determining a network address translation (NAT) traversal policy and an apparatus. The method is applied to a communication system including a first terminal device and a second terminal device. The first terminal device accesses a network by using a first NAT device, and the second terminal device accesses the network by using a second NAT device. In the method, it is determined, by separately obtaining a NAT type and an internet protocol (IP) address of the first terminal device and a NAT type and an IP address of the second terminal device, that both the first terminal device and the second terminal device are of a symmetric NAT type. In addition, based on whether the IP address of the first terminal device is the same as the IP address of the second terminal device, NAT traversal is performed according to different traversal policies.

The invention discloses an end-to-end connection system, which comprises a client, a cloud platform and an equipment end, and is characterized in that the cloud platform acquires an equipment serial number and a user identifier; the cloud platform obtains an external network address of the equipment end according to the equipment serial number; the cloud platform inquires whether unused connection resources exist in a connection pool or not according to the user identifier and the external network address of the equipment side; and under the condition that the connection resources exist, end-to-end connection between the client and the equipment end is established through the connection resources. Through the method and the device, the technical problem of resource waste caused by repeated NAT traversal in related technologies is solved.

This invention provides a network address translation (NAT) traversal method and apparatus, applied to a server. The server, responding to an inbound INVITE request from a client, obtains the client's identification information, which carries the client's network access type. The server determines the client's network access type based on the client identification information. When the network access type is determined to be a preset type, a public network dual-address candidate set is established and ice-lite marking is performed. Based on the public network dual-address candidate set and the ice-lite marking, connection information is determined and sent to the client. Correspondingly, the client receives the connection information sent by the server and establishes a connection with the server based on the public network connection address and the server's ice-lite interactive connection establishment protocol, completing the NAT traversal. This method reduces communication maintenance costs, avoids introducing additional media relay delays, reduces increased call latency and bandwidth consumption, and improves communication quality.

This invention provides a method for predicting call quality and a call quality prediction service apparatus. The method predicts the call quality between a first network communication device and a second network communication device. The method includes: when at least one of the following devices exists between the first and second network communication devices: a device for performing NAT traversal, a device for performing media transcoding, and a device for performing topology hiding; dividing the overall interval between the first and second network communication devices into independent intervals defined by the at least one device; and sequentially performing the call quality prediction for each independent interval by independently executing a transmission test, thereby completing the call quality prediction step between the first and second network communication devices.

One or more embodiments of the invention disclose a network address translation (NAT) traversal method and a device in an intranet. The NAT traversal method executed by a first device in a first intranet comprises the following steps: sending a first NAT address mapping type of the first intranet to a second device in a second intranet; receiving a second NAT address mapping type of a second intranet from a second device; based on at least one of a first NAT address mapping type of the first intranet and a second NAT address mapping type of the second intranet, determining a mode of sending the NAT traversal data packet to the second device, wherein the NAT address mapping type indicates the change mode of the client public network IP address-port pair to which the data from the intranet internet protocol IP address-port pair is mapped.

This invention relates to the field of computer multimedia communication, and in particular to a WebRTC video conferencing system and media stream conversion method compatible with GB / T28181 devices. The system adopts a layered architecture, including a service layer, a STUN / TURN server, a signaling layer, and a media layer. The service layer provides service interfaces for WebRTC clients and stores service data. The STUN / TURN server is used to implement NAT traversal. The signaling layer includes a WebRTC signaling module, a signaling protocol conversion module, and a GB / T28181 signaling module. The media layer includes a WebRTC media module, a media transcoding module, a congestion control module, and a GB / T 28181 media module. This solution proposes the IGCC-A algorithm to reduce frequent jitter in the transmission rate caused by small fluctuations in network latency, and realizes the structure of a WebRTC video conferencing system that accesses GB28181 devices.

Methods, systems, and apparatuses are provided for data communication with user communication devices via a network address translator (NAT). In one example, a set of proxy servers is configured to effect communications through mapped data-communication paths of the NAT during data communication sessions through or with the user communication devices. The mapped paths are susceptible to being unmapped by the NAT if the mapped path is unused for a threshold duration of time. The proxy servers maintain the mapped paths through the NAT by prompting the user communication devices to communicate data to the set of proxy servers, for a duration of time exceeding a threshold duration of time.

The application relates to the technical field of video backhaul, in particular to a unmanned vehicle video backhaul control method and system based on a SIP communication protocol. The control method comprises the following steps: sending, by a local end as a SIP client, a SIP connection request to a unmanned vehicle end through TLS encryption, explicitly indicating that the local end is a video decoding end and the unmanned vehicle end is a video encoding end, simultaneously negotiating audio bidirectional communication capability, and establishing an encrypted signaling connection. The SIP is a mature multimedia communication protocol, has perfect and safe session establishment, modification and termination mechanisms, has better network adaptability, supports NAT traversal and firewall penetration, can stably work in different network environments, and is suitable for unmanned vehicle mobile scenes. The application solves the problems of dynamic bandwidth adaptation and safe and reliable transmission control of unmanned vehicle video backhaul in a complex network environment by constructing a systematic control scheme based on the SIP protocol.

The invention relates to the field of computer network communication, and discloses a cross-network local area network gateway penetrating method, which comprises the following specific steps: S1, complete conical NAT (Network Address Translation) penetration: acquiring a public network I P (Internet Protocol) address and a port of a private network machine through server transfer, so that the machines of the two parties can directly communicate through the public network address; s2, restricting tapered NAT traversal: performing communication between private network machines by using a relay server and a specific communication step, notifying an opposite public network I P address through server transfer, and performing traversal through server auxiliary transmission data; and S3, symmetric NAT traversal: under the condition of symmetric NAT, communication of the private network machine is carried out by using the transit server and a port guessing method, the time difference of a plurality of mapping ports is obtained through multiple communication attempts, and a correct communication port is speculated to carry out NAT traversal. Through the NAT penetration technology, the private network machine can directly communicate with the external network machine, so that end-to-end direct data transmission is realized, and interference and delay of an intermediate node are avoided.

Embodiments of this application provide a network address translation traversal method, a device, and a system, and relate to network address translation technologies in the communications field. The method is applied to a system in which a first terminal communicates with a second terminal. The first terminal is a terminal in a network constructed by a first NAT device, the second terminal is a terminal in a network constructed by a second NAT device, and the first NAT device is different from the second NAT device. The method implements NAT traversal through bidirectional dynamic detection of TTL values at both ends of the NAT traversal, to resolve a problem of low NAT traversal efficiency.

The invention provides a UDP (User Datagram Protocol)-based NAT (Network Address Translation) traversal method, which belongs to the field of computer networks, and comprises the following steps: at one end of an incremental symmetric NAT, a terminal firstly sends an STUN request to an STUN server to obtain a mapping port, then predicts a mapping port requested next time according to a mapping port change rule, and then performs NAT traversal by utilizing the predicted port, so that the NAT traversal is performed under the condition that NAT interference does not exist; if NAT interference occurs at the moment, a correct prediction port is selected to avoid the NAT interference. Redundant steps of repeated single-connection crossing are simplified, crossing time is shortened, and fewer resources are occupied.

The invention provides an NAT (Network Address Translation) traversal method, which is applied to a first terminal in a system, the system further comprises a second terminal, specifically, the first terminal is accessed to a network through a first NAT device, the second terminal is accessed to the network through a second NAT device, the first terminal acquires an IP (Internet Protocol) address of the second terminal in the network, and the second terminal acquires the IP address of the second terminal in the network; and then determining a destination port number of each detection message according to the sending sequence of the plurality of detection messages, and sending the plurality of detection messages through the first NAT device. The destination port numbers of the detection messages are determined according to the sending sequence of the detection messages, so that the NAT traversal success rate is improved on the premise of reducing the packet sending number of the detection messages.

Embodiments of this application provide a network address translation traversal method, a device, and a system, and relate to network address translation technologies in the communications field. The method is applied to a system in which a first terminal communicates with a second terminal. The first terminal is a terminal in a network constructed by a first NAT device, the second terminal is a terminal in a network constructed by a second NAT device, and the first NAT device is different from the second NAT device. The method implements NAT traversal through bidirectional dynamic detection of TTL values at both ends of the NAT traversal, to resolve a problem of low NAT traversal efficiency.