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Why does a call using a compressed audio codec use much more bandwidth than expected?

April 26, 2017audio bandwidth codec COMPRESSED

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Why does a call using a compressed audio codec use much more bandwidth than expected?

1 Answer

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10 Posted

The “headline” bitrate of a audio codec does not include the overhead added by RTP and UDP encapsulation. This overhead means that a compressed code like GSM (with an advertised bit rate of 13200 bits/second) actually consumes 29200 bits/second, while an uncompressed codec like G.711 (with an advertised bit rate of 64kbps) actually consumes 75kbps.