[Asterisk-Users] Detect Dialtone

[Rich Adamson]

> i need to know something in the zaptel configuration
> as it seems i can configure detecting the busy tone and hangup after number of busy tone 
counts, that was great but the problem is sometimes the pstn line has no dialtone and when i 
try to make call it continue dialing while not having a dialtone! while it should say "all 
lines are busy/congested" how can i configure that??
> 
> i already done (immediate=no) and still it opens the zap trunk even when theres no dialtone 
and shows that "zap/3 answered"
> 
> -----------------------------------------------------------------
> ;Specify whether the channel should be answered immediately or
> ; if the simple switch should provide dialtone, read digits, etc.
> ;
> immediate=no
> ------------------------------------------------------------------

I might be way off base here, but the immediate=no parameter is oriented
towards incoming zap calls (not outgoing calls), and the callprogress
and busy detect stuff was intended to detect busy tones (not dial tone).
I don't think there is any logic in the zap channels to "listen for
dial tone before dialing". (But, I could be wrong.)

What are you using for the zap fxo channel (eg, channel bank, tdm, x100p)?

Are you trying to play with the case where you have an analog phone
bridged on your fxo line, and detect the lack of dialtone when 
someone is using that analog phone?