Description: This attribute specifies the encoding of voice traffic.

A voiceEncoding setting of g711G726 specifies that either pulse code modulation (PCM) defined by ITU-T G.711 or adaptive differential pulse code modulation (ADPCM) defined by ITU-T G.726 is used to encode voice traffic. The actual encoding performed depends on congestion in the network and the settings of minVoiceG711G726Rate and maxVoiceG711G726Rate. If voiceEncoding is g711G726, the bit rate of voice traffic can change during a call due to congestion in the network. In this case, the minimum and maximum rates that can occur during a call are specified by minVoiceG711G726Rate and maxVoiceG711G726Rate respectively. If voiceEncoding is g711G726, minVoiceG711G726Rate is 64 and maxVoiceG711G726Rate is 64, G.711 (PCM) encoding is always performed on voice traffic on this channel and all voice traffic is carried uncompressed at 64 kbit/s.

A voiceEncoding setting of g728at16 specifies that the Low Delay Coded Excited Linear Predictive Coder (LD-CELP) algorithm defined by ITU-T G.728 is always performed on voice traffic. If voiceEncoding is g728at16, the bit rate of all voice traffic is fixed at 16 kbit/s. The minVoiceG711G726Rate and maxVoiceG711G726Rate attributes do not apply if voiceEncoding is g728at16.

A voiceEncoding setting of g729at8 indicates that the Conjugated Structure Algebraic Code Excited Linear Predictive Coder (CS- ACELP) algorithm defined by ITU-T G.729 is always performed on voice traffic. If voiceEncoding is g729at8, the bit rate of all voice traffic is fixed at 8 kbit/s. The minVoiceG711G726Rate and maxVoiceG711G726Rate attributes do not apply if voiceEncoding is g729at8.