Getting choppy sound.

Hello, we are using Gumble for voice chat in murmur server, everything is working fine except the sound quality is so choppy that it's hard to continue the conversation. And that's a big problem. As I saw some issues and discussion on that, I tried using AutoBitrate for adjusting bitrate from the server. The server's bitrate is set to 96 KiB/s. I tried changing different AudioInterval and at 60ms it makes it little better but it's not that good as usable. Any suggestion on that for improving the sound quality? Thank you!