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Kamailio dispatcher:
`CREATE TABLE dispatcher ( id SERIAL PRIMARY KEY NOT NULL, setid INTEGER DEFAULT 0 NOT NULL, destination VARCHAR(192) DEFAULT ' NOT NULL, flags INTEGER DEFAULT 0 NOT NULL, priority INTEGER DEFAULT 0 NOT NULL, attrs VARCHAR(128) DEFAULT ' NOT NULL, description VARCHAR(64) DEFAULT ' NOT NULL );
INSERT INTO version (table_name, table_version) values ('dispatcher','4'); `
OpenSIPS dispatcher:
`INSERT INTO version (table_name, table_version) values ('dispatcher','9'); CREATE TABLE dispatcher ( id SERIAL PRIMARY KEY NOT NULL, setid INTEGER DEFAULT 0 NOT NULL, destination VARCHAR(192) DEFAULT ' NOT NULL, socket VARCHAR(128) DEFAULT NULL, state INTEGER DEFAULT 0 NOT NULL, probe_mode INTEGER DEFAULT 0 NOT NULL, weight VARCHAR(64) DEFAULT 1 NOT NULL, priority INTEGER DEFAULT 0 NOT NULL, attrs VARCHAR(128) DEFAULT ' NOT NULL, description VARCHAR(64) DEFAULT ' NOT NULL );
ALTER SEQUENCE dispatcher_id_seq MAXVALUE 2147483647 CYCLE;`
OpenSIPS load_balancer:
`INSERT INTO version (table_name, table_version) values ('load_balancer','3'); CREATE TABLE load_balancer ( id SERIAL PRIMARY KEY NOT NULL, group_id INTEGER DEFAULT 0 NOT NULL, dst_uri VARCHAR(128) NOT NULL, resources VARCHAR(255) NOT NULL, probe_mode INTEGER DEFAULT 0 NOT NULL, attrs VARCHAR(255) DEFAULT NULL, description VARCHAR(128) DEFAULT NULL );
ALTER SEQUENCE load_balancer_id_seq MAXVALUE 2147483647 CYCLE; CREATE INDEX load_balancer_dsturi_idx ON load_balancer (dst_uri);`
Kamailio
2.1. Kamailio modules
The following modules must be loaded before this module:
TM - only if active recovery of failed hosts is required.
database engine - only if you want to load balancing routes from database instead of plain text file. .
2.2. External libraries or applications
The following libraries or applications must be installed before running Kamailio with this module:
none.
OpenSIPS dispatcher依赖
1.2. Dependencies
1.2.1. OpenSIPS modules
The following modules must be loaded before this module:
TM - only if active recovery of failed hosts is required.
clusterer - only if "cluster_id" option is enabled.
database - one of the DB SQL modules
freeswitch - only if "fetch_freeswitch_stats" is enabled..
1.2.2. External libraries or applications
The following libraries or applications must be installed before running OpenSIPS with this module:
none.
OpenSIPS load balancer依赖
1.4. Dependencies
1.4.1. OpenSIPS Modules
The following modules must be loaded before this module:
Dialog - Dialog module
freeswitch. - only if "fetch_freeswitch_stats" is enabled.
dialog - TM module (only if probing is enabled)
clusterer - only if "cluster_id" option is enabled.
database - one of the DB modules
1.4.2. External Libraries or Applications
The following libraries or applications must be installed before running OpenSIPS with this module loaded:
None.
Kamailio dispatcher
INSERT INTO "dispatcher"
VALUES(1,1,'sip:192.168.0.1:5060',0,12,'rweight=50;weight=50;cc=1;',');
INSERT INTO "dispatcher"
VALUES(2,1,'sip:192.168.0.2:5060',0,12,'rweight=50;weight=50;cc=1;',');
OpenSIPS load_balancer
insert into load_balancer (group_id, dst_uri, resources, description) values (1,'sip:100.100.100.103', 'pstn=32', 'FS1');
insert into load_balancer (group_id, dst_uri, resources, description) values (1,'sip:100.100.100.104', 'pstn=32', 'FS2');
OpenSIPS dispatcher的与Kamailio的类似
在面对要进行负载均衡等时，特别是针对话务，我们优先选择OpenSIPS的load_balancer模块，是由于它：
a. 当OpenSIPS将呼叫路由到一组目标时，它能够保留每个目标的负载状态（作为正在进行的呼叫数），并选择路由到负载较少的目标.
b. load_balancer模块能够接收来自目的地的反馈,从而决定它是不是有效的。
c. 它必须依赖内置的Dialog模块为它提供服务。
但是opensips load balancer和kamailio的dispatcher有个缺点，在面临多网卡时，不能象Opensips dispatcher那样指定某个网卡
也就是说，load balancer模块，不是只proxy过去就不管了，而是基于dialog过程获取你到底行不行的干预。
所以，在针对语音SIP进行负载均衡时，OpenSIPS的load_balancer模块要优于dispatcher模块（不论是OpenSIPS还是Kamailio)。