- Protocols
- RTP site (Columbia University)
- RTP/RTCP RFC 3550
- MEGACO Media Gateway Control
RFC 3015
- MGCP Media Gateway Control Protocol
RFC 2705
- SIP Session Initiation Protocol
RFC 2543
- Basic RTP Specs
- VoIP Voice Over IP Reference Page
- H.323
Packet-based multimedia communications systems
- Implementations
- Organizations
- ITU International Telecommunication Union
- IETF Internet Engineering Task Force
T1