Dial delay timeout


I have problem with big PDD value befor hangup in case of congestio/busy. for now it 10 secs.
In my case provider marked as UNREACHABLE in peers list, and
debug is returnig immideatly this:
[Mar 9 21:36:36] WARNING[4181]: app_dial.c:1081 dial_exec_full: Unable to creat
e channel of type ‘SIP’ (cause 3 - No route to destination)
== Everyone is busy/congested at this time (1:0/0/1)

but then waiting 10 secs before next step for hangup.

where i need to find solution in sources or config ?

You probably want to provide relevant portions of your dial plan.