On 17 Apr 2006, at 12:58, Joseph Rothstein wrote:
I'd like to start a discussion about Asterisk redundancy. I know
this has
been covered in the past, but would like to get an idea of what
people are
doing for a production system that must be up "all" the time.
Assuming a single E1 out.
Here are some of my ideas.
HA Linux between the two asterisk boxes. But I am not sure how the
Asterisk
DB would handle a fail over. What happens to the SIP registrations?
Can the
Asterisk DB be offloaded to MYSQL for example? The local DB is
importatn
because this is a call center with agents logged in to multiple
queues.
Config could either be realtime or duplicated manually. What about
recorded
message, has anyone had any problems with an NFS volume providing
recorded
messages such as periodic messages in queues? This solution would
require a
manual swap of the E1 cable inthe event of failure.
Is anyone using a PRI to Ethernet bridge, or any other kind of E1
GW that
would allow failover to an alternate Asterisk box without manually
switching
the cable? This one is a litte
expensive(http://www.mapleleaf-technologies.com/webstore/
ethernetbridges.php
), but seems like it would do the trick. But I would have to run TDMoE
between the Asterisk boxes and the bridge. Not a big deal probably,
but I
have no experience with TDMoE.
I would appreciate any comments regarding redundancy, and how
people are
solving these problems.
Regards to all,
Joe
I strongly advise you to get the economics clear before you proceed.
Get an estimate of the business costs of (say) 1hour's downtime every
3 years.
Once you have done that you have a budget to work to. If you don't
and you
just follow the "No downtime ever!" rule two things will happen:
1) you will spend a boatload of money, probably far more than
needed.
2) You will fail. 100% uptime doesn't happen - ever - folks get close,
but every step costs exponentially more, and gets exponentially more
complex - so much harder to maintain - so more fragile.
Also don't forget to talk to your telco and hear what they can do for
you.
You may find that they can detect a PRI failure and move calls to a
fallback
number (mobiles, analog, answerphone, voicemail,voip provider).
I _very_ much doubt you can find a solution where you can have
the box at your end of the PRI fail (be it an asterisk or a switching
box)
and still keep the current calls.
Keep us posted on what you find, it is an important topic and my
views ("keep it simple") aren't typical :-)
Tim.
Tim Panton
[EMAIL PROTECTED]
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