T46S: small and severe audio interruptions

[ronald.swaypc]

We have a T46S working with freeswitch and we are experiencing small and sometimes severe audio interruptions with this phone model.
Testing has been done changing jitter cache, turn, stun and codecs having always the same behavior.
T46S calls another extension and T46S has issues listening to the other person.
Calls done by the T46S always present high jitter on the call information compared with the same call done by a cisco (used to compare).

The same testings has been done with a cisco phone having a better quality call in all aspects.

Is there any parameters or configuration to take into account in order to fix these problems??
Anybody else with a similar issue??

Thanks