IAX2 Jitter Buffer

Has anyone had any luck with the IAX2 jitterbuffer in 1.4?

While I know not specifically a freepbx question…

Audio quality on the IAX trunk deteriorates significantly with the buffer enabled, I’ve tried several different variations, but in each case seems to make things worse rather than better.

[code:1]jitterbuffer=yes
maxjitterbuffer=1500
maxjitterinterps=100
resyncthreshold=1500
trunktimestamps=yes
[/code:1]

Without jitterbuffer set there are occasional issues on the trunk, missing syllables / words etc. With the jitter buffer there are frequent missing syllables / words and often sounds like a skipping record.

Thoughts?

James