Detect Busy tone in Analog Lines

Asterisk Asterisk General
#1

Hi. When I dial via FXO port,How can I make the Asterisk detect “Busy tones” and then Wait(5) and try to call again?

What application listen for busy tone and then jump to the next priority?

Thanks

#2

run core show applications and search if one of them meet you goal.

[quote] ChanIsAvail() Indicates whether the specified channel is available.

Check the availability of Dahdi/1 and Dhadi/2:
exten => 123,1,ChanIsAvail(Dahdi/1&Dhadi/2,j)
; As an exception, using priority jumping, because we want to announce
; something to the caller if no channel is available

; at least one channel is available - dial this channel:
exten => 123,2,NoOp(${AVAILORIGCHAN} is available)
exten => 123,3,Dial(${AVAILORIGCHAN}/123456)

; if the call goes to priority 102 landen, neither Dahdi/1 nor Dahdi/2 is available
exten => 123,102,Playback(all-channels-busy)
[/quote]
the-asterisk-book.com/1.6/applik … avail.html