7 results about "NAT traversal" patented technology

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.

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.