Computer Networking › Section B · The application layer › Topic B.8
Real-time voice and video
A phone call or video meeting cannot buffer seconds ahead the way a film can. Its media must cross the network in a fraction of a second, so real-time applications are built around UDP, timing information, small buffers and clever ways of hiding the packets that never arrive in time.
In this topic
- The delay budget of a conversation
- Packetising voice
- Worked example: the real bit rate of a call
- RTP and RTCP
- Jitter and the playout buffer
- Worked example: a playout deadline
- Recovering from loss
- Setting up calls: SIP and SDP
- WebRTC and getting through NAT
- Group calls and network priority
- Common mistakes to avoid
- Key takeaways
This topic is part of Wuanberri Pro. Checking your access…