asterisk users - Apr 2012 - Asterisk as sip client Unable to create channel of type 'Console' (cause 0 - Unknown)

Hello, I'm trying to build a page system using a Dell Desktop PC optiplex
170L, 

My sound card is working fine under /dev/snd/

exten => s,1,Dial(Console/snd/,20,A(trek))
exten => s,2,Hangup

But won't work! I get the following error

[Apr 27 11:44:46] WARNING[2950]: chan_oss.c:377 find_desc: could not find
<snd>
[Apr 27 11:44:46] WARNING[2950]: chan_oss.c:850 oss_request: oss_request ty
<Console> data 0x0xb6acc8e8 <snd>
[Apr 27 11:44:46] NOTICE[2950]: chan_oss.c:852 oss_request: Device snd not
found
[Apr 27 11:44:46] WARNING[2950]: app_dial.c:2218 dial_exec_full: Unable to
create channel of type 'Console' (cause 0 - Unknown)


Please help!