In the context of VoIP (and WebRTC), bitrate is the number of bits that can be either sent or received per time unit (usually set to a second).

A few things to remember about bitrate:

  • The maximum bitrate possible is capped by the bandwidth available, which can be dynamic throughout a single session. See BWE
  • Voice codecs require much less bitrate than video codecs
  • Downstream and upstream bitrates are asymmetric

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