<br clear="all">Some hardware will do fail over such as the Twin Star enabled Astribanks from Xorcom. They use USB to connect to the server. When the telephony hardware detects that the master server is no longer responding it automatically switches to the backup server. I believe you still have to set up rsync cron jobs to keep certain things in sync to make that switchover seamless though.<br>
<br><div class="gmail_quote">On Wed, Aug 19, 2009 at 12:51 PM, JR Richardson <span dir="ltr"><<a href="mailto:jmr.richardson@gmail.com">jmr.richardson@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im">> Because the senario which I want to make it happen is that I will be having<br>
> two asterisk machines which acts as primary and secondary servers and all<br>
> the phones would be connected to the primary server, I want to see that if<br>
> the first server is down then the phones can pick up the second server using<br>
> Dundi.<br>
<br>
</div>You can not use DUNDi for this. DUNDi is an Asterisk peer-to-peer<br>
protocol, only Asterisk understands DUNDi. The phones do not know<br>
anything about DUNDi, they usually talk SIP to Asterisk.<br>
<br>
What you are describing is 2 Asterisk servers setup in a Master/Slave<br>
High Availability scenario, whereby all phones would register to the<br>
Master and if the Master failed, the phones would register to the<br>
Slave and continue to operate.<br>
<br>
This has been done before and works well. You need some HA utility<br>
like UltraMonkey to share an IP between the Master/Slave and then use<br>
rsync to keep the voicemail/ast database/config files updated between<br>
the servers.<br>
<br>
This discussion is better on the asterisk-ha-clustering list.<br>
<br>
Good Luck.<br>
<br>
JR<br>
<font color="#888888">--<br>
JR Richardson<br>
Engineering for the Masses<br>
</font><div><div></div><div class="h5"><br>
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