Cisco SPA501G Administration Guide - Page 119
module. It uses 2-byte Silence Insertion Descriptor SID, Set G729 annexb
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Configuring SIP, SPCP, and NAT Configuring SIP 4 Parameter Set G729 annexb Description G.729 Annex B (G.729b) that provides silence compression by enabling a voice activity detection (VAD) module. It uses 2-byte Silence Insertion Descriptor (SID) frames transmitted to initiate comfort noise generation (CNG). If transmission is stopped and the link goes quiet because of there is no speech transmitted, the receiving side might assume that the link has been cut. By inserting comfort noise, analog hiss is simulated digitally during the silence to assure the receiver that the link is active and operational. none-do not enable. no-turn on but do not silence the VAD. yes-enable. Not applicable to the Cisco SPA525G or Cisco SPA525G2. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 118
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