[asterisk-users] zap fallback

[Eric "ManxPower" Wieling]

Steve Kennedy wrote:
> I'm trying to get zap fallback to VoIP working. I dial the zap channel
> and if it fails I want to then try another route.
> 
> If the channel is busy (i.e. CHANUNAVAILABLE) it works, however if
> there's no dial-tone, it doesn't seem to detect this?
> 
> Using a TDM400 with UK settings.

The TDM400P does not detect dialtone.  It also does not detect if there 
is voltage on the line.  Make sure your lines are working.