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DTX and Comfort Noise DTX is Discontinuous Transmission Voice activity detector (VAD) detects if there is active speech or not. When there is no active speech different DTX procedures can be used: No Transmission at all Comfort Noise (CN) using RFC 3389 Codec built CN in like AMR SID (Silence Descriptor) Frequency of Comfort Noise packets varies but is usually some fraction of normal packet rate |