H.323 Basics
H.3 2 3: A C L O S E R L O O K
Application layer control protocol
Consists of set of protocols
Defines mechanisms for call routing, call signaling, capabilities exchange and media control
Extensive set of modules and annexes provide enhanced functionality.
Relies on:
- H.245 and H.225 (Q.931, RAS) for call control
- H.450 for supplementary services
- RTP/RTCP (Real-Time Protocol) for
- transporting media streams
- H.26x and G.7xx protocols for video & audio codecs