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voip guide

RTP Jitter And Packet Loss

RTP carries real-time audio. Small timing problems can be hidden by jitter buffers, but sustained packet loss or jitter usually turns into audible quality issues.

Packet Loss

Packet loss means RTP sequence numbers skipped. In voice calls, this can sound like clipping, missing syllables, or brief silence.

Jitter

Jitter is variation in packet arrival timing. High jitter can sound robotic or uneven even when the total packet loss is low.

Direction Matters

  • If only one RTP direction is unhealthy, check NAT, routing, firewall policy, and media anchoring for that direction.
  • If both directions are unhealthy, look for shared congestion, access link pressure, or a bad intermediate path.
  • Compare SIP signaling with RTP results before assuming the codec is the problem.

Encrypted Media

SRTP still exposes packet timing and sequence behavior, but audio extraction requires the proper key material and authorization.