What kind of CODEC is applied to ALLWIN's VoIP GW?

ALLWIN's VoIP GW supports the following CODEC simultaneously.
-G.711 A-law / u-law (64kbps)
-G.723.1 (5.3 or 6.3kbps)
-G.726 (ADPCM 40, 32, 24, 16 kbps)
-G.729a/G.729b (8kbps)