Thanks for the reply.
The default sound device in Windows is the sound card.
If Skype is set to use the Uplink, then it shows audio error on the Skype who calls me, also, there is not any sound in this case.
If the sound device in Skype is the sound card, everything works perfect.
I forgot, maybe it's neccessary: I use Windows 2000 server and Skype 2.5.
2.6 & 3.1.0.52 does not work with any setting.
Screenshots:
Working: http://img218.imageshack.us/my.php?image=workingnm8.png
Not Working: http://img204.imageshack.us/img204/842/notworkingfr6.png
Windows sound settings: http://img412.imageshack.us/img412/6994/soundsettingsui9.png
Update: reinstalled Skype 2.5, and now it seems to accept Uplink as Sound device.