Skype problem with usb headset (dsp4)

[Mario Sergio Fujikawa Ferreira]

Hi,

   I would like to know if anyone has had any success using Skype with a 
usb headset (/dev/dsp4).

   I have set Skype to use /dev/dsp4 but it does not work correctly. 
When I try to use the "Skype Test Call", I can hear the phone ringing. 
However, I can't hear a thing once the other side answers the phone. It 
is all silent although Skype says the call is working.

   The headset seems to be correct since I can hear music when I try it 
with mplayer

$ mplayer -ao oss:/dev/dsp4 some.mp3

   Any ideas?

$ uname -a
FreeBSD exxodus.fedaykin.here 7.0-BETA1 FreeBSD 7.0-BETA1 #15: Sat Oct 
20 13:08:30 BRST 2007     lioux at exxodus:/usr/obj/usr/src/sys/LIOUX  i386

$ cat /dev/sndstat
FreeBSD Audio Driver (newpcm: 32bit 2007061600/i386)
Installed devices:
pcm0: <EMU10Kx DSP front PCM interface> on emu10kx0 [MPSAFE] 
(4p:1v/1r:1v channels duplex default)
pcm1: <EMU10Kx DSP rear PCM interface> on emu10kx0 [MPSAFE] (1p:1v/0r:0v 
channels)
pcm2: <EMU10Kx DSP center PCM interface> on emu10kx0 [MPSAFE] 
(1p:1v/0r:0v channels)
pcm3: <EMU10Kx DSP subwoofer PCM interface> on emu10kx0 [MPSAFE] 
(1p:1v/0r:0v channels)
pcm4: <USB Audio> at ? kld snd_uaudio [GIANT] (1p:2v/1r:2v channels duplex)
         mode 1:(output) 2ch, 16/16bit, pcm, 48000,44100Hz
         mode 1:(input) 1ch, 16/16bit, pcm, 48000,44100Hz

$ mixer -f /dev/dsp4
Mixer vol      is currently set to  75:75
Mixer pcm      is currently set to  75:75
Mixer speaker  is currently set to  75:75
Mixer mic      is currently set to  75:75
Recording source: mic