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Problems with TFRC style packet rate penalties
Varying the packetization, directly affects the system delay seen at the receiver.
Requires a jitter buffer that is capable of handling the increased or decreased system delay.
Frequent changes will make it more problematic for adaptive buffers to correctly parameterize the jitter.
Buffer under-runs needs to be handled with little impact on voice quality. Thus insertion of audio data or invoking of error concealment becomes required.
PPT Version