[VoiceOps] SIP Trunk Failover

[Mike Johnston]

I agree with Jay, it is very customer specific.  We offer all varieties 
of failover to meet their needs.

Some have multiple sites with us and want the entire trunk to failover 
to a trunk at an alternate site.  This requires the alternate site to be 
prepared to accept all of the DIDs of the first site, serve the 
appropriate IVRs, attempt to ring phones (possibly at the first site if 
they still have connectivity to it), etc.  Or they might choose to 
simply redirect all such DIDs to the main number of the alternate site.  
Either way, the customer has a lot of control over happens without 
having to coordinate with me.

Sometimes they want it to failover to a phone number, like a cellphone, 
an answering service, or like before, an alternate location.  If the 
alternate location is not served by me, or maybe they just don't want to 
configure all of the DIDs of the first site into their alternate site's 
PBX, then it makes sense to failover to the main number of the alternate 
site.

If the customer were to request different behaviors for different DIDs, 
then I would do that.  For example, a school might want different 
failover behaviors for the Elementary Office DID, the High School Office 
DID, and all the other DIDs.  That would make sense and I would 
certainly set that up for them.

We have some where the failover is POTS lines in a small hunt group, 
that we preferably deliver as traditional copper loops.

If the customer did not request a failover, then the default will be a 
busy signal.