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RTP - Real-Time Transport Protocol

Cisco Aug 31, 2025
  • Runs on top of UDP to deliver audio and video
  • Adds timestamp and sequence number
  • Needs to be prioritized with QoS

CRTP: compresses the IP/UDP/RTP headers on low-speed connections (T1 or less), takes 40 bytes header to 2-4 bytes

SRTP: provides encryption, authentication, and integrity services

VAD: Provides bandwidth savings by eliminating silence

RTCP: Real-Time Transport Control Protocol

  • tracks calls and provides statistics
  • Double-press help key whilst on a call to view statistics
  • Not essential for call quality, doesn't need to be priortized with QoS

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Craig Garnham

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