[Asterisk-Users] Backup Proxy & Automatic Failover

[Steve Dolloff]

I simply have 2 asterisk servers and have the clients point to a DNS SVR
record for their proxy.  The DNS record lists the primary and secondary
with preference for the primary.  This won't stop calls from being
dropped if the primary goes down if you are routing them through the
server, but it does ensure that calls placed while the primary is down
will still go through.

You could do some load management by putting multiple servers in the DNS
record and use a DNS server that supports round robin responses.

Stephen


> -----Original Message-----
> From: Adthrawn [mailto:adthrawn at adthrawn.freeserve.co.uk]
> Sent: Tuesday, December 30, 2003 12:50 PM
> To: asterisk-users at lists.digium.com
> Subject: [Asterisk-Users] Backup Proxy & Automatic Failover
> 
> Hi,
> 
> I read in the Asterisk Whitepaper, that you can run two cloned
servers,
> one as a primary, one as a backup, and have them automatically
failover
> to the other unit when it crashes, or when you need to restart it. The
> primary application of course, would be ensuring calls can be made
when
> frequent updates are being handled, or when an update must be
restarted
> on a busy network.
> 
> The term TDM is banded around too, but from my knowledge, TDM is
> trunking (probably some clever acronym relating to trunking), and in
> Asterisk's case, using the IAX protocol. This leads me to the big
> question;
> 
> Is there anyway of shifting the load of one Asterisk server to another
> without breaking or loosing a call?
> 
> I know that with Survivable Routing (Cisco's big on this), the ISDN
> interface is actually a router; so the Proxy is just used to decide
the
> destination and LCR functions, and then hands off to a router. This of
> course, if a Proxy went down, would just prevent new calls from being
> made, whilst existing calls can continue merrily - until someone
> switches the Router off, or corrupts the IOS settings :-)
> 
> At least with Routers, you can configure them to load manager
> effectively, but how do you backup and load manage Asterisk??
> 
> I using SIP, and will be using a bit of SCCP too, so any suggestions
> would be most grateful!!
> 
> Regards,
> Ad.
> 
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