What types of voice codec do HT-series VoIP products support

HT-series analog telephone adaptors support G.711U, G.711A, G729A/B, G723.1, G726-32, iLBC. Each codec has its uniqueness for certain function and application: Both G711U and G711A are non-compression code, need 64k bandwidth with high-fidelity audio quality but their bandwidth consumption is also the highest (64kbps). When the internet enviroment is not good, it is easy to lose packet that the oice will lose his stability. G729A/B, G723.1, G726-32 and iLBC are all compression code which will give you near toll quality at much smaller bandwidth consumption (G723 consumes 5.3/6.3kbps and G729 consumes 8kbps). So in the Chinese internet enviroment, we suggest G729A/B and G723.1