[Asterisk-Users] SIP and sound breaking

[Matic]

Hi,

is there any way to increse the buffer or something to make SIP 
connections sound better? When I make the calls with Asterisk as a SIP 
client (through sip.voipbuster.com) the sound quality is poor - 
constantly breaking  (there are few occasional seconds when the sound is 
OK)- but with any other SIP client on the same network and through 
sip.voipbuster.com sound is allways OK.

Matic