[asterisk-users] bad call quality

[Edrich de Lange]

Hello

Im at a complete loss. I run a couple of asterisk servers all connecting 
to international sip providers.
All three servers are on the same type of internet connection 
(Martis/Diginet).
There isnt a shortage of bandwidth, and its not a codec issue, as ive 
tried swapping codecs.
If its not a line issue, because if i route the calls via sip via 
another server(which i own)(in same country) and then break out from 
there i get good quality, but im paying for triple bandwidth then, and 
bandwidth in south Africa is hellishly expensive.
The Physical hardware is not overloaded either.
I have tried rebooting my equipment, and that changed nothing either.
 if i do a ping flood i get decent results(well, only about 10ms more 
than another perfectly working branch)

What else could this Be?
Im completely Dumbstruck.

Regards
Edd