asterisk users - Apr 2012 - Auto answer Asterisk ; Unable to create channel of type

Hello, I'm trying to get s extensions to autoanswer to Centos computer
speakers, the computer is a Dell Optiplex 170L embeded sound card. I'm
running Centos 6.2 i386 with Asterisk 1.8.10
Does anybody know how to fix error below? 

 -- Executing [s at default:1] Dial("SIP/publicip-00000001",
"console/sda1,20,A(trek)") in new stack
[Apr 19 14:25:25] WARNING[2966]: chan_oss.c:377 find_desc: could not find
<sda1>
[Apr 19 14:25:25] WARNING[2966]: chan_oss.c:850 oss_request: oss_request ty
<console> data 0x0xb6a448e8 <sda1>
[Apr 19 14:25:25] NOTICE[2966]: chan_oss.c:852 oss_request: Device sda1 not
found
[Apr 19 14:25:25] WARNING[2966]: app_dial.c:2218 dial_exec_full: Unable to
create channel of type 'console' (cause 0 - Unknown)
  == Everyone is busy/congested at this time (1:0/0/1)
    -- Executing [s at default:2] Hangup("SIP/publicip-00000001",
"") in new
stack
  == Spawn extension (default, s, 2) exited non-zero on
'SIP/publicip-00000001'

#lspci -v

00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER
(ICH5/ICH5R) AC'97 Audio Controller (rev 02)
        Subsystem: Dell Device 017a
        Flags: bus master, medium devsel, latency 0, IRQ 17
        I/O ports at ee00 [size=256]
        I/O ports at edc0 [size=64]
        Memory at feb7fa00 (32-bit, non-prefetchable) [size=512]
        Memory at feb7f900 (32-bit, non-prefetchable) [size=256]
        Capabilities: [50] Power Management version 2
        Kernel driver in use: Intel ICH
        Kernel modules: snd-intel8x0

Thanks,