Too many protocols

Application Layer
RTP: Real-time Transport Protocol (RFC 3550)
RTCP: RTP Control Protocol
SIP: Session Initiation Protocol
SDP: Session Description Protocol
RTSP: Real Time Streaming Protocol
SRTP: Secure Real-time Transport Protocol

Transport Layer
DCCP: Datagram Congestion Control Protocol
SCTP, Stream Control Transmission Protocol
TCP: Transmission Control Protocol
UDP: User Datagram Protocol
RDP: Reliable Datagram Protocol

Internet Layer
IP: Internet Protocol
IPSec: Internet Protocol Security
ICMP: Internet Control Message Protocol

Link Layer
IEEE 802
Ethernet