New sipx admins who set up HA (High Availability) are often disappointed when 
they realize that only the commserver
(proxy/registrar) provides redundancy.  The sipx roadmap calls for creating 
redundancy of other components (voicemail,
auto-attendant, MWI, RLS/BLF, ACD, sipxconfig) but those improvements are a 
ways off.  Regardless, even the commserver redundancy is
of little use if the primary target for inbound calls to sipx is an 
auto-attendant, which is a common configuration (as opposed to
having DID to individual sipx users).  If the primary server is down then so is 
the auto-attendant, which means inbound calls never
get delivered even though the distributed server is up.

Has anyone found a good way to deal with this limitation?  One thought I've had 
is to configure sipx so that inbound calls go to a
dummy extension which does serial call forwarding, first to the auto-attendant, 
and then directly to an operator's line or hunt
group.  For example:

  - gw sends inbound calls to x900 (which is NOT the alias of an AA)
  - x900 is configured with a serial User Call Forwarding list:
           1) x100 (AA)
           2) local operator's extension, or hunt group of appropriate users


Will that work?  Does anyone have better/different ideas?

If we come up with a good way to deal with this issue then in it might be 
worthwhile to find a way to express it in the sipxconfig
GUI, so it's clear to sipx admins without them having to ask the questions I'm 
asking.

   Thx, -m

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