[Asterisk-Users] asterisk load balance

[Douglas Garstang]

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.
 
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?'. 
 
I'm sure most other stuff will fail too. The Asterisk boxes share no state information.
 
Doug.
 
 

	-----Original Message----- 
	From: unplug [mailto:maillisting at gmail.com] 
	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-----------------------+
	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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