2.2.5.1. Encoding 
For example, the following encoding can be selected:
- G.711 (PCM) with support for Annex 1 (packet loss enhancements) and Annex 2 (Voice Activity Detection with Comfort Noise Generation).
- G.729A voice compresses to 8Kpbs.
- G.729AB with Voice Activity Detection.
IMPORTANT:
Note that there is virtually no delay introduced in generating
G.711 encoding from TDM voice packets (Algorithmic Delay = 0 ms).
For more detailed information on codecs please refer to Section 1.3,
“Codec Standards”.