Gb28181 gateway Module

This article from csdn ucser, http://blog.csdn.net/perfectpdl reprinted to indicate the source, thank you

Provides the GB 28181 gateway and the overall solution.I created
A video monitoring communication group 306754195 welcome to join.

GB 28181 defines the video monitoring interconnection specification based on the SIP architecture. If you want to connect a monitoring system implemented by most private protocols to the SIP architecture, you need to use the gateway, gb28181 Specification

Achieve interconnection between the SIP monitoring domain and the non-Sip monitoring domain.

The interconnection structure between the SIP monitoring domain and non-Sip monitoring domain is shown in the figure below. The Gateway is an interface device that connects non-Sip monitoring domains to the SIP monitoring domains and converts the information data of networked systems at multiple levels. Based on the converted information data type, gateways are logically divided into control protocol gateways and media gateways.

Control Protocol Gateway implements network transmission protocol, control protocol, and device address between devices in the SIP and non-Sip monitoring domains.
The specific functions should include one or more of the following:
A) The agent non-Sip monitoring domain device registers on the SIP server of the SIP monitoring domain;
B) convert the network transmission protocol of a non-Sip monitoring domain device to the network transmission protocol stipulated in section 5.1;
C) associate the device control protocol of a non-Sip monitoring domain device with the session Initial protocol, Session Description Protocol, and control description stipulated in section 4.3.
Two-way protocol conversion between the Protocol and the media playback control protocol;
D) Perform bidirectional address translation between the device addresses of non-Sip monitoring domain devices and the device addresses specified in 6.3.

For example, if the camera cameraa is followed by the client clienta on the SIP monitoring platform A, the camera must support the SIP protocol. The clienta obtains information about all the cameras on the platform A through the message request in the SIP protocol, create an invite session to retrieve cameraa data.

To access the non-SIP protocol in such a system, the first edition can be divided into two types.

First, we want to connect a camera that does not support the SIP Protocol. In this case, we need to build a software SIP client on the top of the camera hardware, use this SIP client to communicate with platform.

The other type is also quite common. We want to access a complete set of platforms with their own protocol (non-Sip) and name this platform B. On platform B, camera camerab and client clientb are followed. They communicate with clientb through a set of internal conventions or private protocols to monitor camerab. The access goal is to allow the clienta on platform A to monitor camerab on platform B and other functions. In essence, the platform B is connected to platform. In this case, you need to develop a gateway for protocol conversion.