Voice codec g729;ilbc;gsm;ulaw;alaw

[shezad]

I have a question about voice codec that are used with voxalot, on the voxalot provider site i can see g729;ilbc;gsm;ulaw;alaw.

I have a registered account with lowratevoip and from theyr site i can see they use theese voicecodec :

G.711 (64 kbps)

G.726 (32 kbps)

G.729 (8 kbps)

G.723 (5.3 & 6.3 kbps)

GSMFR (13.2 kbps)

Well im getting some voiceproblem when i make a call to Pakistan using the lowrateprovider true voxalot. Im using a linksys spa1001 adapter, and on it im using G711 voice codec. The voxalot codec g729;ilbc;gsm;ulaw;alaw.

Im wondering, is it the adapter that controlls the codec or voxalot voice codec system ?