voip terrible sound

rb433ah and 3sector 120* 18db in base station. My client connect with rb411ah 14db panel antenna throughput 20mb now pap2 linksys link with base station but voice like sound not good we talk to another side breaking sound whats problem please any body suggestion this problem help me

Well.

VoWIFI is a huge topic… first forget about pure 802.11 infrastructure. do you use nstreme on your link ? if no use it.