Description: This attribute specifies how ingress voice traffic is encoded.

If voiceEncoding is g711G726, ingress voice traffic is encoded using either pulse code modulation (PCM) defined by ITU-T G.711 or adaptive differential pulse code modulation (ADPCM) defined by ITU-T G.726. The actual encoding and rates performed depends on congestion in the network and the minimum and maximum negotiated ingress voice rates in negotiatedIgRates.

If voiceEncoding is g728at16, ingress voice traffic is encoded using the Low Delay Coded Excited Linear Predictive Coder (LD-CELP) algorithm defined by ITU-T G.728. If voiceEncoding is g728at16, the bit rate of all voice traffic is fixed at 16 kbit/s. minVoiceG711G726Rate and maxVoiceG711G726Rate do not apply if voiceEncoding is g728at16.

If voiceEncoding is g729at8, ingress voice traffic is encoded using the Conjugated Structure Algebraic Code Excited Linear Predictive Coder (CS-ACELP) algorithm defined by ITU-T G.729. If voiceEncoding is g729at8, the bit rate of all voice traffic is fixed at 8 kbit/s. minVoiceG711G726Rate and maxVoiceG711G726Rate do not apply if voiceEncoding is g729at8.

The current ingress encoding and encoding rate are available in currentEncoding and currentRate.

voiceEncoding cannot be set to g728at16 or g729at8 if this VoiceService is running on a DS1V, E1V, 1pDS1V, 1pE1V or J2MV card. Also, voiceEncoding can only be set to g728at16 or g729at8 if the corresponding feature exists in the featureList of the Sw Lpt.

The negotiated ingress voice encoding is available in negotiatedIgEncoding.

voiceEncoding must have the same value at both ends of a VoiceService. If voiceEncoding does not have the same value at both ends of a VoiceService, the VoiceService will be out of service. In this case, serviceFailureReason is mismatchedVoiceEncoding.