On Fri, 16 Jun 2006, Douglas Garstang wrote:
Unless you can guarantee that the system that is currently processing a call
will be the system that handles a transfer request from a phone, are the same,
then transfers will not work.
Incorrect. Transfers work fine between multiple asterisk boxes.
Round robin DNS won't work at all. Every time you send out a SIP message, your
going to be sending it to a different Asterisk box. For example, your initial
INVITE will go to asterisk server 1. Asterisk server 1 will then send back a
message requesting authorisation. Your phone does another lookup, and gets
Asterisk server 2 this time. The phone sends the new INVITE with the auth info
to Asterisk server 2. Asterisk server 2 will probably be ok with this, but when
it sends a TRYING back to the phone, depending on the phone you are using,
everything will fall in a heap on the floor. I know polycoms do. They get this
TRYING from an asterisk server they didn't send and they go 'huh?'.
This is entirely phone dependant, and usually the phones that "fall in a
heap" (like the phrase much?) also handle secondary server configurations
MUCH better than the phones that don't. Polycoms and sipura's handle SRV
and backup server settings better than cisco's, but cisco's won't jump
from server to server.
I'm sure most other stuff will fail too. The Asterisk boxes share no state
information.
It's all in how you program the dial plan. The main thing that doesn't
share state information that may cause problems is hinting. Everything
else is programmable somewhere in the system :)
-----Original Message-----
From: unplug [mailto:[EMAIL PROTECTED]
Sent: Fri 6/16/2006 9:41 PM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Cc:
Subject: [Asterisk-Users] asterisk load balance
Hi,
I am designing a asterisk load balancing model as follow. There are
3 asterisks connected to a single DB and a single server storing all
the configuration file and voicemail. Round Robin DNS will distribute
the request to asterisks.
DNS round robin ---+ asterisk1--------------------------+ DB and file
server
+---asterisk2-----------------------+
+---asterisk3-----------------------+
Your design would work just fine as long as you have your dialplan is
configured right. Keep in mind though that if asterisk1 dies, you just
lost your db.
Does anyone has load balancing experience implemented in asterisk that
can share? Does my design work? Does any conflict will happen in my
design? Any comment?
Thanks!
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--
Aaron Daniel
Computer Systems Technician
Sam Houston State University
[EMAIL PROTECTED]
(936) 294-4198
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