Protocols Behind VoIP
Session Initiation Protocol (SIP)
- SCCP - Skinny Call Control Protocol is the precursor (from Cisco)
- Call setup & teardown
- Designed for MBONE
- Basically a dedicated national network just for multicast (one packet to many people)
- Is ancient
- Accepted by 3rd Generation Partnership Project
- Supported by 3rd party conferencing solutions
- Instant massaging, file transfer, online games, chat systems
Realtime Streaming Protocol (RTSP)
- Establishing and control of media sessions
- Client requests play / pause / record / etc
- Not responsible for streaming
- Realtime Transport Protocol (RTP)
- Realtime Control Protocol (RTCP)
Advanced Video Coding (AVC, H.264)
- Supports Resolutions up to 8K UHD
- Supports multi audio / multi video
- Used by Blu Ray, YouTube, Netflix, Hulu, Prime Video
- We can actually sniff this and see things passing by.