Welltech FXSO Gateway In SIP V.1.2 - Manual (Page 35)

FXSO SIP Gateway User Manual Document Ver.: 102
Released Dec., 2004
33
A large jitter buffer causes increase in the delay and decreases the packet loss.
A small jitter buffer decreases the delay but increases the packet loss. The size
of the jitter buffer depends on the condition of the network, which varies with
time. Typically the packet loss should be less than 10% for a good quality of
speech.