[Asterisk-Users] Connecting to a cluster of SIP servers

[billy at kersting.com]

Although there maybe a better way, this would work:

1. Add the IP's into your sip.conf and set qualify=yes.
2. Make your dialplan something like the following:
	exten => _X.,1,Dial,SIP/${EXTEN}@84.92.0.75
	exten => _X.,2,Hangup
	exten => _X.,102,Dial,SIP/${EXTEN}@84.92.0.76
	exten => _X.,103,Hangup
	exten => _X.,203,Dial,SIP/${EXTEN}@84.92.0.189
	exten => _X.,204,Hangup
	exten => _X.,304,Dial,SIP/${EXTEN}@84.92.0.190
	exten => _X.,305,Hangup

This would make your failover work but certainly wouldn't help with the load
balancing between the servers. If any cannot qualify or are congested, they
will automatically failover to the next server.

I believe most people use an SER proxy for this type of application. It
seems to work well with the round robin type DNS.

William	

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Steve Hill
Sent: Saturday, April 22, 2006 5:13 AM
To: Asterisk-Users at lists.digium.com
Subject: [Asterisk-Users] Connecting to a cluster of SIP servers


My Asterisk server is connecting to "sip.plus.net", which resolves to 
multiple IP addresses:

     sip.plus.net.           300     IN      A       84.92.0.75
     sip.plus.net.           300     IN      A       84.92.0.76
     sip.plus.net.           300     IN      A       84.92.5.189
     sip.plus.net.           300     IN      A       84.92.5.190

If one of these machines is down (i.e. it's not replying to the SIP 
packets or it's sending back ICMP Port Unreachable), Asterisk keeps trying 
the same server. Shouldn't Asterisk move on to the next server 
automatically in this case? It seems to only way to do this at the moment 
is to run the "reload" command, which causes it to do a DNS lookup and it 
may then pick one of the other servers.

-- 

  - Steve
    xmpp:steve at nexusuk.org   sip:steve at nexusuk.org   http://www.nexusuk.org/

      Servatis a periculum, servatis a maleficum - Whisper, Evanescence

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