T42G: first second of audio missing (caller doesn't hear "hello" from callee)

[Lasse]

Hi,

We have a problem with our T42Gs and firmware 29.81.0.110 as well as recent preceding firmwares: the first second of the answer is often not heard by the person calling, so the person who answers the phone says "hello" but the person calling doesn't hear it. Appears to be very similar to a problem reported earlier for the T28 model: http://forum.yealink.com/forum/showthread.php?tid=738

Unfortunately it does not occur all the time and we fail to reproduce it, so it's difficult to troubleshoot. Would the remote syslog level 6 logs be of any use? If so, I can activate it on a couple of phones and ask their users to report any occurrence so that I can send you the relevant logs.

Any idea how we can fix this?
Lasse