[asterisk-users] Why does Asterisk not hangup?

[Klaus Darilion]

Hi!

I have the following scenario:
          Asterisk
INVITE-----> |
<--200,ACK-- |
           Playback(Foo)
              |
           Dial(..)
              | ---------INVITE----->
              | <-----404. ACK------>
              |
As my extension configuration stops after the Dial command I expect 
Asterisk to hang up the call. Instead I see on the console:
	     |
              |
   == Auto fallthrough, channel 'SIP/81.16.153.183-0883dea0' status is 
'CONGESTION'
              |
              |
       Then I hear the congestion tone
     for 10 secondes, then Asterisk sends BYE
              |
<-----BYE----|


Why does Asterisk not hangup immediately? Why 10 seconds congestion 
tone? Is this configurable?

thanks
klaus