Of course i use g711 codec. Beside this. Simple Zoiper with G711a codec but without encryption and SIP working fine with same IPVA. No voice quality issue. Is it possible to disable it on PBX itself because disabling using webconfig on phone itself is fine but only for 1 or 2 of 5 customers. But what to do in case of hundreds customers ? We want to avoid as more as possible forcing our customers to do any configurations on their side.