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Voice Over IP and VOIP Protocols

VOIP Codec Protocols
H.264/MPEG-4: Video CODEC For High Quality Video Streaming
H.263: Video Coding and Decoding (CODEC)
H.261: Video Coding and Decoding (CODEC)
G.7xx: Audio (Voice) Compression Protocols (CODEC) (G.711, G.721, G.722, G.726, G.727, G.728, G.729)
VOIP General Protocols
Voice Over IP and VOIP Protocols
VOIP Media Protocols
DCCP: Datagram Congestion Control Protocol
RTP: Real-Time Transport Protocol
RTCP: Real Time Transport Control Protocol (or RTP Control Protocol)
VOIP Signaling Protocols
T.120: Multipoint Data Conferencing and Real Time Communication Protocols (T.121, T.122, T.123, T.124, T.125, T.126, T.127)
SIP: Session Initiation Protocol
SDP: Session Description Protocol
SCCP: SS7 Signalling Connection Control Part
SAP (v1 & v2): Session Announcement Protocol
NCS: Network-Based Call Signaling Protocol
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Other Voice Over IP and VOIP Protocols
VOIP Call Flow based on the Gateway Control Protocols (GCPs)
VOIP Architecture based on the Gateway Control Protocol (GCP)
VOIP Call Flow based on the Session Initiation Protocol (SIP)
VOIP Architecture based on the Session Initiation Protocol (SIP)
VOIP Call Flow based on the H.323 Protocol
VOIP Architecture based on the H.323 Protocol
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