[Asterisk-Users] iax2 jitter stats confusion

[Andrew Kohlsmith]

I have been kind of tracking IAX2 calls and trying to measure performance 
with a given "iax2 set jitter" command.  My default is 250ms..

When a call is in progress I'll be watching it at the console with "iax2 
show channels"  Here are my stats from one particular call:

66.225.202.72    benshaw     00001/16413  00048/00035  00489ms  0221ms  ILBC
66.225.202.72    benshaw     00001/16413  00137/00125  00487ms  0270ms  ILBC
66.225.202.72    benshaw     00001/16413  00137/00125  00491ms  0269ms  ILBC
66.225.202.72    benshaw     00001/16413  00141/00129  00487ms  0241ms  ILBC
66.225.202.72    benshaw     00001/16413  00141/00129  00480ms  0235ms  ILBC
66.225.202.72    benshaw     00001/16413  00143/00131  00480ms  0256ms  ILBC
66.225.202.72    benshaw     00001/16413  00144/00132  00492ms  0268ms  ILBC
66.225.202.72    benshaw     00001/16413  00152/00140  00487ms  0472ms  ILBC
66.225.202.72    benshaw     00001/16413  00154/00142  00507ms  0473ms  ILBC

Now I figured the guy would be coming up to my office shooting but when I 
asked him how the call was he said "perfect." -- now he knows he's on a 
VOIP call but he had no idea of the jitter and lag here... 

So I suppose my question is "huh?"

How can I have such poor jitter and yet have this guy (not a techie) claim 
the call was perfect?  Neither he nor the guy on the other end (PSTN 
through NuFone) had any issues about the quality.

I don't want to look a gift horse in the mouth, so to speak, but I would 
like to know how to measure call quality; I thought jitter was a pretty 
good indicator.

Regards,
Andrew