Hi I have G729 and G723 codecs installed, I made some calling using a SIP IP phone. when I used the codecs 723 and 729 the call volume is less and the sound is little jerky, it's like call signals coming in and out. when I use gsm or G711 it works great sound quality is crystal clear. is this some thing to do with jitter buffer , is there a way to increase the volume using asterisk. tks kani