WebRTC
Implements web-based video conferencing, WHATWG protocol standard is intended to provide a simple javascript browser can achieve real-time communications (Real-Time Communications (RTC)) capability
WebRTC provides the core technology of video conferencing, including the collection of audio and video codecs, network transmission, display and other functions, and also supports cross-platform: windows, linux, mac, android
WebRTC, instant messaging name from the web page: Abbreviations (English Web Real-Time Communication), is a web browser to support real-time voice conversations or video conversation API. It is on June 1, 2011 and be included in the open source W3C Recommendation World Wide Web Consortium at Google, Mozilla, Opera support
SIP
SIP (Session Initiation Protocol, Session Initiation Protocol) is a multimedia communication protocol developed by the IETF (Internet Engineering Task Force, Internet Engineering Task Force)
It is a text-based application-layer control protocol for creating, modifying and releasing one or more participants in the session. SIP is an IP voice session control protocol from the Internet, with a flexible, easy to implement, easy to expand and so
User Agent
User-Agent
header contains a feature character string, used to allow the peer network protocol to identify the type of application initiation request user agent software, operating system, software developers and the version number