– Kamailio SIP Server –

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asterisk:load-balancing-and-ha [2012/03/24 10:39]
121.54.125.194
asterisk:load-balancing-and-ha [2012/03/26 18:13] (current)
kenny removed spam
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 +====== Asterisk Load balancing and High Availability with Kamailio (OpenSER) ======
 +
 +Kamailio coupled with Asterisk are implemented in many huge installations.
 +
 +The simplest way to set up load balancing is to use the dispatcher module.
 +
 +The dispatcher.list file should be set up like:
 +
 +<​code>​
 +# group  sip addresses of your * units
 +1 sip:​10.1.2.3:​5060
 +1 sip:​10.1.2.4:​5060
 +1 sip:​10.1.2.5:​5060
 +</​code>​
 +
 +the basic kamailio.cfg should be like:
 +
 +<​code>​
 +
 +loadmodule("​dispatcher.so"​)
 +
 +...
 +
 +if ( method=="​INVITE"​ ) {
 +# dst_select( "​GROUP",​ "HASH METHOD"​)
 +  ds_select_dst("​1","​4"​);​
 +  sl_send_reply("​100","​Trying"​);​
 +  forward();#​uri:​host,​ uri:port);
 +  exit();
 +}
 +
 +</​code>​
 +
 +If you are interested in using the dispatcher to do 300 Redirect, you can do the following:
 +
 +<​code>​
 +if ( method=="​INVITE"​ ) {
 +  dst_select_domain("​1","​4"​);​
 +  # you can also add prefixes, if you need to send account codes
 +  # like:
 +  # prefix("​123456"​);​
 +  sl_send_reply("​300","​Redirect"​);​
 +  exit;
 +}
 +</​code>​
 +in this fashion, you can put in a very inexpensive Kamailio SIP server installation to use as a load-balancer for your * units.
 +
 +
 +====SRV Records====
 +
 +Another option is to use SRV records for your asterisk server group and forward the message to the domain.