Have you tried calling the 'echo test' number (search for 'echo test' in Skype)? This eliminates the 'skypeout' and 'other phone networks' part of the callpath.
And the USB handset is supposed to be a normal audio device to what you are using on the computer (my guess). Have you tried recording a bit of audio from the handset and playing it back?
I have just started playing with Skype and I noticed I need to find a good microphone. Which may explain the sudden interest in microphones at work ;)
Greetings,
Koos van den Hout
Koos van den Hout, PGP keyid RSA/1024 0xCA845CB5 via keyservers snipped-for-privacy@kzdoos.xsall.nl or DSS/1024 0xF0D7C263 -?) Fax +31-30-2817051 Visit the site about books with reviews /\\\\