asterisk users - Jan 2011 - Channel in an unkown state

Hello all.

I have a dahdi card with 2 FXO and 1 FXS. I'm able to make calls without any
problem. However, when I have an incoming call, I see the following message on
the asterisk console:

    -- Starting simple switch on 'DAHDI/1-1'
    -- Executing [s at DID_trunk_1:1] ExecIf("DAHDI/1-1",
"1?SetCallerPres(unavailable)") in new stack
    -- Auto fallthrough, channel 'DAHDI/1-1' status is 'UNKNOWN'
    -- Hungup 'DAHDI/1-1'

Notice the "status UNKNOWN".

Can someone help me?

Best regards,
-vcf