Here is VoIP protocols on OSI 7 Layers
Layer 6 / Presentation ; G.729(A), G.723, G.711
Layer 5 / Session ; H.323, SIP, SDP
Layer 4 / Transport ; RTP, UDP, RSVP
Layer 3 / Network ; IP, WFQ, IP
Layer 2 / Data Link ; CRTP, MP
Layer 1 / Physical ;
I hope it is informative.
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