Codecs/VAD/CNG

Codecs:

g.711 (64kbps) - Good voice quality
Voice payload+RTP+UDP+IP=160+12+8+20=200Bytes

g.729 (8kbps)
Voice payload+RTP+UDP+IP= 20+12+8+20= 60Bytes

cRTP (w/checksum)= 4
CRTP(no checksum)=2


g.711 = 160=4 = 164
g.729 = 20+4= 24


VAD:

Voice Activity Detection : Silence is not packetized and that bw is used by other data/voice transmission.

CNG:

Comfort Noise Generation fills the dead silence by white noise.

VAD is not preferred.