T46G Using Empty Wave as ringtone

[asegojv]

Hi!
since last firmwareupgrade to 28.80.0.95
we have the issue that the phone is ignoring empty wave files.
We use the phones with a headset. Every ringtone is set to this empty
wave ringtone except of the interal ringtone. If we are using the Silent wave
the headset is noch indicating an incomming call. This should always be, doesnt matter if internal or external call.
Every external call should only ring on headset.

Hopefully somebody understands and has a solution.

Regards