[Asterisk-Users] Fail over to Pri on VoIP connection failure

[Damon Estep]

> -----Original Message-----
> From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-
> bounces at lists.digium.com] On Behalf Of Andrew Kohlsmith
> Sent: Friday, January 27, 2006 2:07 PM
> To: asterisk-users at lists.digium.com
> Subject: Re: [Asterisk-Users] Fail over to Pri on VoIP connection
failure
> 
> On Friday 27 January 2006 16:00, Damon Estep wrote:
> > In the event that the first attempt DOES NOT RESPOND (is down) there
has
> > to be a timeout value to go to the next priority, correct? Otherwise
the
> > channels just sits silent waiting for a response.
> 
> That's what the qualify parameter in sip/iax.conf is for.  Never
terminate
> calls without it.  :-)  It won't *guarantee* that you'll never get
dead
> air,
> but it sure goes a long way to ensuring that it happens so
infrequently
> you'll think you misdialed.
> 
> > I think your macro assumes that you got a response from nufone, but
what
> > if they were dead in the water?
> 
> Then qualify would have failed and Dial() would have immediately
returned
> CHANUNAVAIL.
> 
> -A.

OK - starting to make sense now

Qualify=yes for the peer in sip.conf

If you have qualify=yes I assume that triggers a sip query to get
channel capabilities from the peer? What is the qualify timeout? Can it
be manipulated?

If the goal was strictly to try one provider, and if the channel fails
qualify, then try the next, is the macro you posted needed?

Couldn't you just;

Exten => ####,1,Dial(SIP/{$exten at peer1}
Exten => ####,2,Dial(SIP/{$exten at peer2}
Exten => ####,3,Congestion(15)
Exnte => ####,4,Hangup