[Asterisk-Users] Asterisk with MySQL

[rizwan]

Hello

I have configured asterisk using RealTime.
When i typed the dial command, got the error like
*CLI> dial 12345 at test1
*CLI>     -- Executing NoOp("OSS/dsp", "?call for ?12345")
 == Auto fallthrough, channel 'OSS/dsp' status is 'UNKNOWN'
<< Hangup on console >>

When I tried to call from my dialler i got the message, 503 service unavailable:

Can you please tell me what can be the reason of :
== Auto fallthrough, channel 'OSS/dsp' status is 'UNKNOWN' and of Service unavailabe.

Thanks