Kamailio是一个开源的SIP服务器，原名OpenSER 

Kamailio is an Open Source, GPL2, SIP Server Routing Platform. It is written in C for Linux/Unix plaforms and focuses on performance, flexibility and security.

On Nov 04, 2008, Kamailio and SIP Express Router have started the SIP Router Project.

Web links

• Home page with new project name: http://www.kamailio.org
• Home page with old project name: http://www.openser-project.org
• SourceForge.net Project page: http://sourceforge.net/projects/openser/

Features

• SIP proxy/registrar/redirect server (RFC3261, RFC3263)
• UDP/TCP/TLS/SCTP support
• Transactional stateful proxy
• Modular architecture
• Programmable configuration file
• ENUM support
• Call Processing Language (CPL)
• Gateway to sms or xmpp
• Authentication, authorization and accounting via Radius or database
• NAT traversal system
• Least cost routing
• Load balancing
• Carrier routing
• Multiple database backends: MySQL, Postgres, Oracle, BDB or flat files
• SIMPLE Presence Server (IETF SIMPLE extensions - rich presence)
• Dialog Info Presence - SLA/BLA
• XCAP and RLS
• Presence User Agent
• Dialog Stateful Proxy
• Instant Messaging
  • Offline message storage
  • Instant messaging conferencing
• SNMP support
• Perl Programming Interface
• Java SIP Servlet Application server
• Over 80 modules (extensions)

Documentation

• Main Documentation Page - http://www.kamailio.org/docs/
• Dokuwiki Page - http://www.kamailio.org/dokuwiki/

我们使用Kamailio主要用在SIP dispatcher server，即SIP redirect server
安装及配置手册如下

一．安装
1．依赖包：
libmysqlclient & libz (zlib) ：mysql DB support (the db_mysql module) Shared libraries

                        MySQL-shared-5.1.32-0.glibc23.i386.rpm

                        MySQL-devel-community-5.1.32-0.rhel5.i386.rpm

libxml2：cpl-c (Call Processing Language) or the presence modules (presence and pua*)
libperl：perl scripting from you config file (perl module)
2．源代码安装
make，make modules，make install
或者make all，make install
参考：
3．启动：kamctl start
4．重启：kamctl restart
5．监控服务状态：kamctl moni
6．MySQL配置：
1）安装：
edit Makefile.var files to include the MySQL module
vim Makefile.vars
Uncomment the next line in the file:
MODS_MYSQL=on
cp /usr/local/lib/mysql/libmysqlclient.so.16 /usr/lib

Edit now /usr/local/etc/kamailio/kamctlrc and add:
DBENGINE=MYSQL
SIP_DOMAIN=pryko.com
6.1 创建数据库：kamdbctl create
6.2管理员登录：user 'admin' with password ' openserrw '
6.3 添加用户：kamctl add
6.4 默认值：database url, users and passwords
  - DEFAULT_DB_URL="mysql://opensips:opensipsrw@localhost/opensips"
  - r/w user: openser; passwd: openserrw
  - r/o user: openserro; passwd: openserro

二．配置
1．配置文件 kamailio.cfg
/usr/local/etc/kamailio/kamailio.cfg
2．配置文件 kamctlrc
/usr/local/etc/kamailio/kamctlrc

三．脚本
参考文档：
Kamailio Wiki
http://www.kamailio.com/dokuwiki
Cookbooks and Reference
http://www.kamailio.com/dokuwiki/doku.php/core-cookbook:1.5.x
Kamalio 1.5.x Module Functions Index
http://www.kamailio.com/dokuwiki/doku.php/modules:1.5.x:index-functions


四．负载均衡Load Balancing
参考：http://www.kamailio.org/dokuwiki/doku.php/asterisk:load-balancing-and-ha
4.1配置文件 kamailio.cfg
loadmodule("dispatcher.so")
modparam("dispatcher", "list_file", "/usr/local/etc/kamailio/dispatcher.list")
modparam("dispatcher", "force_dst", 1)
4.2 ---dispatcher.list----文件
# group sip addresses of your * units
1 sip:221.5.152.171:5060
1 sip:221.5.152.170:5060
4.3 kamctl命令：kamctl dispatcher show
-- command 'dispatcher' - manage dispatcher
  * Examples:  dispatcher addgw 1 sip:1.2.3.1:5050 1 'outbound gateway'
  *            dispatcher addgw 2 sip:1.2.3.4:5050 3 ''
  *            dispatcher rmgw 4
dispatcher show ..................... show dispatcher gateways
dispatcher reload ................... reload dispatcher gateways
dispatcher dump ..................... show in memory dispatcher gateways
dispatcher addgw
            .......................... add gateway
dispatcher rmgw ................ delete gateway

查看载入的配置：kamctl dispatcher dump
修改后重新载入配置：kamctl dispatcher reload

如需使用，需安装MySQL-client-community-5.1.32-0.rhel5.i386.rpm
否则报错：ERROR: This command requires a database engine - none was loaded

五．与Asterisk对接负载均衡
注意事项：sip.conf
注释如下行
;canreinvite=no ; Asterisk by default tries to redirect

Asterisk#1  10.10.10.56
配置sip.conf
[5000]
type=friend
;username=5000
secret=5000_phone2
callerid=5000
qualify=yes ; Qualify peer is no more than 2000 ms away
nat=no ; This phone is natted
host=dynamic ; This device registers with us
;canreinvite=no ; Asterisk by default tries to redirect
配置extension.conf
[default]
exten => 6000,1,Dial(SIP/6000@10.10.10.57,60)
exten => 5000,1,Dial(SIP/5000,60)

Asterisk#2  10.10.10.57
配置sip.conf
[6000]
type=friend
;username=6000
secret=6000_phone2
callerid=6000
qualify=yes ; Qualify peer is no more than 2000 ms away
nat=no ; This phone is natted
host=dynamic ; This device registers with us
;canreinvite=no ; Asterisk by default tries to redirect
配置extension.conf
[default]
exten => 6000,1,Dial(SIP/6000,60)
exten => 5000,1,Dial(SIP/5000@10.10.10.136,60)

Kamailio 10.10.10.136
配置kamailio.cfg
…
loadmodule "dispatcher.so"
modparam("dispatcher", "list_file", "/usr/local/etc/kamailio/dispatcher.list")
…
route{
if ( !mf_process_maxfwd_header("10") )
{
  sl_send_reply("483","To Many Hops");
  drop();
};
ds_select_dst("1", "0");
forward();
}
配置dispatcher.list
# line format
# setit(integer) destination(sip uri) flags (integer, optional)
1 sip:10.10.10.56:5060

测试：
登录10.10.10.57上的6000，登录10.10.10.56上的5000
从6000呼叫5000，会呼叫10.10.10.136上的5000，10.136重定向到10.56

六．按号码段重定向网关
配置kamailio.cfg
使用正则表达式
route{
        if (!mf_process_maxfwd_header("10")) {
                sl_send_reply("483","Too Many Hops");
                exit;
        }
if (uri=~"^sip:5[0-9]+@10.10.10.136$") {
  if (is_method("INVITE")) {
  ds_select_dst("1", "0");
  forward();
  exit;
  }
}
if (uri=~"^sip:8[0-9]+@10.10.10.136$") {
  if (is_method("INVITE")) {
  ds_select_dst("2", "0");
  forward();
  exit;
  }
}
sl_send_reply("404","Not here");
exit;
}
配置dispatcher.list
# line format
# setit(integer) destination(sip uri) flags (integer, optional)
1 sip:10.10.10.56:5060 #1
2 sip:10.10.10.54:5060

测试：
登录10.10.10.57上的6000，登录10.10.10.56上的5000
从6000呼叫5000，会呼叫10.10.10.136上的5000，10.136重定向到10.56
从6000呼叫8002，会呼叫10.10.10.136上的8002，10.136重定向到10.54

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