This object specifies the type of comfort noise generation:
(1) none: No comfort noise generation
(2) simple: Cisco Proprietary comfort noise generation
(3) g711A2: ITU G.711 Appendix II compliant
This object is applicable only if
'ccasVoiceCfgNoiseRegEnable' is set to 'true'.
When Voice Activation Detection(VAD) is enabled by
setting 'ccasIfExtVoiceCfgVadEnabled' to 'true',
'ccasVoiceCfgNoiseRegEnable' indicates whether or not
the background comfort noise should be played to fill
the silence gaps.
If 'ccasVoiceCfgNoiseRegEnable'
is set to 'false', this object contains value 'none(1)'.