[asterisk-users] zap fallback

Matthew Fredrickson
Fri, 18 May 2007 10:54:08 -0000

On May 18, 2007, at 11:50 AM, 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.

Asterisk does not do dialtone detection before it starts using a zap
channel.  That's probably why you are seeing this behavior.

Matthew Fredrickson