通过OpenSIPS对FreeSWITCH进行负载均衡网络上的文章很多，但都是基于老版本的OpenSIPS，目前最新的OpenSIPS LTS版是2.4，如果使用老版本配置文件，OpenSIPS是运行不起来（当然通过一番修改后还是可以运行起来的）。笔者经过一番折腾，成功实现了OpenSIPS 2.4版本对FreeSWITCH的负载均衡，这里将折腾的注意项及最终的配置记下来，以免下次真的要用时又重新折腾。笔者对OpenSIPS不是很熟悉，可能有些地方有纰漏，欢迎各位网友指正。

一、环境介绍：

OpenSIPS OS：debian 8

OpenSIPS Version：2.4 LTS

OpenSIPS IP：172.16.100.30/31

OpenSIPS HA：keepalived

OpenSIPS VIP：172.16.100.32

OpenSIPS domain：sofia.superpipi.cn

FreeSWITCH OS：debian 8

FreeSWITCH Version：1.81

FreeSWITCH IP：172.16.100.10/11

DB：Mysql 5.7

注：OpenSIPS的高可用，采用keepalived进行VIP切换实现，目前未添加OpenSIPS的可用性检测脚本，仅作VIP切换。

二、组网介绍：

本次试验采用以下组网结构，两个节点OpenSIPS采用keepalived进行VIP切换，两个节点FreeSWITCH实现负荷分担，OpenSIPS和FreeSWITCH均连接到MySQL（注：FreeSWITCH连接MySQL数据库，需提取channels建表SQL并将字段长度改小，然后手工创建channels表）。在路由器（笔者使用的路由器有Dnsmasq功能）上将域名sofia.superpipi.cn解析到OpenSIPS的VIP（172.16.100.32），SIP分机注册时通过域名sofia.superpipi.cn进行注册。至于为何要通过域名注册，这是因为FreeSWITCH默认的域名是其本地的IP，若注册的域非FreeSWITCH本地IP，则可能导致注册不上同时也无法通话，通过修改FreeSWITCH的域名称可以实现。如果将FreeSWITCH域名修改为OpenSIPS的VIP，那么VIP只有一个，FreeSWITCH就只能有一个域了，而指向OpenSIPS的VIP的域名可以是多个，这样就可以实现FreeSWITCH多域。至于FreeSWITCH为何要多个域，主要是方便权限管控，在实际生产中意义重大。

FreeSWITCH折腾笔记8——使用OpenSIPS进行负载均衡_负载均衡

三、安装及基础配置：

3.1、安装和配置keepalived

3.1.1、安装keepalived

keepalived安装直接通过apt安装即可

apt-get install keepalived
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3.1.2、修改keepalived配置：

编辑/etc/keepalived/keepalived.conf，将两个节点分别按以下配置修改。

  • 01节点keepalived配置：
! Configuration File for keepalived
global_defs {
   notification_email {
     acassen
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 172.16.100.251
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    garp_master_delay 10
    smtp_alert
    virtual_router_id 53
    priority 200
    nopreempt
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 915119
    }
    virtual_ipaddress {
        172.16.100.32/24
        172.16.100.32/24 label eth0:1
    }
}
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  • 02节点keepalived配置：
! Configuration File for keepalived
global_defs {
   notification_email {
     acassen
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 172.16.100.251
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    garp_master_delay 10
    smtp_alert
    virtual_router_id 53
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 915119
    }
    virtual_ipaddress {
        172.16.100.32/24
        172.16.100.32/24 label eth0:1
    }
}
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3.2、安装和配置OpenSIPS

3.2.1、安装OpenSIPS

笔者安装OpenSIPS是通过官方deb包直接安装的，执行步骤如下：

  • 添加源：
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 049AD65B
echo "deb http://apt.opensips.org jessie 2.4-releases" >/etc/apt/sources.list.d/opensips.list
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  • 更新源和安装OpenSIPS
apt-get update && apt-get install opensips
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3.2.2、配置OpenSIPS

  • 创建数据库

编辑/etc/opensips/opensipsctlrc将以下项去注释并按实际情况修改，或直接通过echo追加到/etc/opensips/opensipsctlrc

echo "SIP_DOMAIN=sofia.superpipi.cn" >> /etc/opensips/opensipsctlrc
echo "DBENGINE=MYSQL" >> /etc/opensips/opensipsctlrc
echo "DBPORT=3306" >> /etc/opensips/opensipsctlrc
echo "DBHOST=172.16.100.15" >> /etc/opensips/opensipsctlrc
echo "DBNAME=opensips" >> /etc/opensips/opensipsctlrc
echo "DBRWUSER=opensips" >> /etc/opensips/opensipsctlrc
echo "DBRWPW="ligen119"" >> /etc/opensips/opensipsctlrc
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执行创建数据库工具（注：如数据库不在本机，需授权root用户远程访问权限）

/usr/sbin/opensipsdbctl create
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运行以上命令后会提示输入root密码，输入root密码后提示输入数据库字符集（吐槽一下不能选utf8），这里输入gbk（后续可能需要存储中文），其后按向导进行数据库创建。

  • 配置启动参数

启动参数编辑不是必须，如果生产应用建议还是将内存参数做相应的扩大。

编辑/etc/default/opensips将以下项去注释并按实际情况修改，或直接通过echo追加到/etc/default/opensips

echo "RUN_OPENSIPS=yes" >>/etc/default/opensips
echo "USER=opensips" >>/etc/default/opensips 
echo "GROUP=opensips" >>/etc/default/opensips 
echo "S_MEMORY=512" >>/etc/default/opensips 
echo "P_MEMORY=32" >>/etc/default/opensips 
echo "DUMP_CORE=yes" >>/etc/default/opensips
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  • 配置文件

编辑/etc/opensips/opensips.cfg，清空原配置文件，将以下内容插入配置文件。（本配置文件基本是参考freeswitch官方wiki的配置文件）

log_level=1  #老版本日志级别参数为debug，级别范围1-4，建议生产上设置为1，为3或者4时将产生大量日志，磁盘空间很快就不够了
sip_warning=0
log_stderror=no
log_facility=LOG_LOCAL0
log_name="opensips"
debug_mode=no
children=4
dns_try_ipv6=no
auto_aliases=no
listen=udp:172.16.100.30:5062  #另外一个节点设置为udp:172.16.100.31:5062，取本地IP，不添加该监听项则备用节点无法与负载节点握手，导致备用节点将调度列表的负载节点设置为不可用
listen=udp:172.16.100.32:5060
mpath="/usr/lib/x86_64-linux-gnu/opensips/modules/"

loadmodule "db_mysql.so"
loadmodule "signaling.so"
loadmodule "sl.so"
loadmodule "tm.so"
loadmodule "rr.so"
loadmodule "uri.so"
loadmodule "dialog.so"
loadmodule "maxfwd.so"
loadmodule "textops.so"
loadmodule "mi_fifo.so"
loadmodule "dispatcher.so"
loadmodule "load_balancer.so"
loadmodule "sipmsgops.so"
loadmodule "proto_udp.so"
modparam("mi_fifo", "fifo_name", "/tmp/opensips_fifo")
modparam("dialog", "db_mode", 1)
modparam("dialog", "db_url", "mysql://opensips:ligen119@172.16.100.15/opensips") 
modparam("rr", "enable_double_rr", 1)
modparam("rr", "append_fromtag", 1)
modparam("tm", "fr_timer", 2)
modparam("dispatcher", "db_url", "mysql://opensips:ligen119@172.16.100.15/opensips")
modparam("dispatcher", "ds_ping_method", "OPTIONS")
modparam("dispatcher", "ds_ping_interval", 5)
modparam("dispatcher", "ds_probing_threshhold", 2)
modparam("dispatcher", "ds_probing_mode", 1)
modparam("load_balancer", "db_url", "mysql://opensips:ligen119@172.16.100.15/opensips")
modparam("load_balancer", "probing_method", "OPTIONS")
modparam("load_balancer", "probing_interval", 5)
route{

        if (!mf_process_maxfwd_header("10")) {
                sl_send_reply("483","Too Many Hops");
                exit;
        }

        if (!has_totag()) {
                record_route();
        }
        else {
                loose_route();
                t_relay();
                exit;
        }
        if (is_method("CANCEL")) {
                if ( t_check_trans() )
                        t_relay();
                exit;
        }
        if (is_method("INVITE")) {
                if (!load_balance("1","pstn","1")) {
                        send_reply("503","Service Unavailable");
                        exit;
                }
        }
        else if (is_method("REGISTER")) {
                if (!ds_select_dst("1", "4")) {
                        send_reply("503","Service Unavailable");
                        exit;
                }
        }
        else {
                send_reply("405","Method Not Allowed");
                exit;
        }
        if (!t_relay()) {
                sl_reply_error();
        }
}
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  • 添加负载节点

在数据库添加两个负载节点信息

INSERT INTO </span>opensips<span class="token punctuation">.</span>load_balancer<span class="token punctuation"> (</span>id<span class="token punctuation">, </span>group_id<span class="token punctuation">, </span>dst_uri<span class="token punctuation">, </span>resources<span class="token punctuation">, </span>probe_mode<span class="token punctuation">, </span>description<span class="token punctuation">) VALUES ('1', '1', 'sip:172.16.100.10', 'vm=100;conf=100;transc=100;pstn=500', '1', 'FS1');
INSERT INTO </span>opensips<span class="token punctuation">.</span>load_balancer<span class="token punctuation"> (</span>id<span class="token punctuation">, </span>group_id<span class="token punctuation">, </span>dst_uri<span class="token punctuation">, </span>resources<span class="token punctuation">, </span>probe_mode<span class="token punctuation">, </span>description<span class="token punctuation">) VALUES ('2', '1', 'sip:172.16.100.11', 'vm=100;conf=100;transc=100;pstn=500', '1', 'FS2');
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  • 允许绑定非本机IP

执行以下命令使OpenSIPS能监听在本机IP，当VIP飘过来时OpenSIPS服务即可用

echo 'net.ipv4.ip_nonlocal_bind=1' >> /etc/sysctl.conf
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  • 将日志输出到指定文件

在/etc/rsyslog.conf追加keepalived和OpenSIPS日志输出配置。（注：OpenSIPS配置文件中log_stderror和debug_mode需设置成no，否则可能不能输出单独日志）

echo "local0.*                        /var/log/opensips.log" >>/etc/rsyslog.conf
echo "local1.*                        /var/log/keepalived.log" >>/etc/rsyslog.conf
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3.2.3、开始OpenSIPS

  • 重启rsyslog、keepalived、OpenSIPS
service rsyslog restart
service keepalived restart
service opensips restart
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  • 添加FreeSWITCH到调度列表

执行以下命令将两个节点添加到调度列表，（这里添加调度器的命令和1.7版本是有区别的）

opensipsctl dispatcher addgw 1 sip:172.16.100.10 5060 0 50 'FS1' '节点1'
opensipsctl dispatcher addgw 1 sip:172.16.100.11 5060 0 50 'FS2' '节点2'
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添加调度列表成功后，在两个FreeSWITCH的控制通过sofia profile sofia.superpipi.cn siptrace on命令打开sip消息跟踪即可看到两个OpenSIPS节点不停在跟FreeSWITCH通过”OPTIONS“消息进行握手，如下：

   ------------------------------------------------------------------------
recv 349 bytes from udp/[172.16.100.31]:5062 at 21:41:43.502417:
   ------------------------------------------------------------------------
   OPTIONS sip:172.16.100.10 SIP/2.0
   Via: SIP/2.0/UDP 172.16.100.31:5062;branch=z9hG4bK2fe7.7ea62cf7.0
   To: sip:172.16.100.10
   From: <sip:dispatcher@localhost>;tag=5f8cfd923bd21a2d7f298654cd327b22-8a62
   CSeq: 14 OPTIONS
   Call-ID: 2d922c18059b1edd-1681@172.16.100.31
   Max-Forwards: 70
   Content-Length: 0
   User-Agent: OpenSIPS (2.4.2 (x86_64/linux))

   ------------------------------------------------------------------------
send 735 bytes to udp/[172.16.100.31]:5062 at 21:41:43.503285:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/UDP 172.16.100.31:5062;branch=z9hG4bK2fe7.7ea62cf7.0
   From: <sip:dispatcher@localhost>;tag=5f8cfd923bd21a2d7f298654cd327b22-8a62
   To: <sip:172.16.100.10>;tag=t2y6pUXm66tQH
   Call-ID: 2d922c18059b1edd-1681@172.16.100.31
   CSeq: 14 OPTIONS
   Contact: <sip:172.16.100.10>
   User-Agent: FreeSWITCH-mod_sofia/1.8.1+git~20180724×××60524Z~b33bc925c5~64bit
   Accept: application/sdp
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: timer, path, replaces
   Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
   Content-Length: 0

   ------------------------------------------------------------------------
recv 349 bytes from udp/[172.16.100.30]:5062 at 21:41:45.769168:
   ------------------------------------------------------------------------
   OPTIONS sip:172.16.100.10 SIP/2.0
   Via: SIP/2.0/UDP 172.16.100.30:5062;branch=z9hG4bKbace.ec1b06f.0
   To: sip:172.16.100.10
   From: <sip:dispatcher@localhost>;tag=45af385df62c8fa46b1bdd54b7adb556-4f80
   CSeq: 14 OPTIONS
   Call-ID: 735a40b173b81153-37063@172.16.100.32
   Max-Forwards: 70
   Content-Length: 0
   User-Agent: OpenSIPS (2.4.2 (x86_64/linux))

   ------------------------------------------------------------------------
send 735 bytes to udp/[172.16.100.30]:5062 at 21:41:45.770861:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/UDP 172.16.100.30:5062;branch=z9hG4bKbace.ec1b06f.0
   From: <sip:dispatcher@localhost>;tag=45af385df62c8fa46b1bdd54b7adb556-4f80
   To: <sip:172.16.100.10>;tag=UBrZrper3FHaD
   Call-ID: 735a40b173b81153-37063@172.16.100.32
   CSeq: 14 OPTIONS
   Contact: <sip:172.16.100.10>
   User-Agent: FreeSWITCH-mod_sofia/1.8.1+git~20180724×××60524Z~b33bc925c5~64bit
   Accept: application/sdp
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: timer, path, replaces
   Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
   Content-Length: 0

   ------------------------------------------------------------------------
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四、FreeSWITCH配置和验证

4.1、域名修改

因话机注册时是通过域名注册，因此需要修改FreeSWITCH的域为注册的域名。

编辑../conf/vars.xml，将domain设置为sofia.superpipi.cn。（注：如FreeSWITCH使用多域，则参照多域的方式进行修改，参考：https://www.cnblogs.com/lzpong/p/8573372.html）

<X-PRE-PROCESS cmd="set" data="domain=sofia.superpipi.cn"/>
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修改后需重启FreeSWITCH才能生效

4.2、注册验证

笔者分别使用eyeBeam、Linphone、eSpace SoftPhone三种软电话和一个Fanvil X5硬电话进行注册测试，均可注册成功。

在freeswitch所在服务器执行fs_cli -x “sofia status profile sofia.superpipi.cn reg”

结果如下：

root@debian:~# fs_cli -x "sofia status profile sofia.superpipi.cn reg"
Registrations:
=================================================================================================
Call-ID:        19024618511954-772266364347@172.16.100.110
User:           1004@sofia.superpipi.cn
Contact:        "1004" <sip:1004@172.16.100.110:6060>
Agent:          Fanvil X5 1.3.256.1566
Status:         Registered(UDP)(unknown) EXP(2018-09-23 22:14:29) EXPSECS(2228)
Ping-Status:    Reachable
Ping-Time:      0.00
Host:           debian
IP:             172.16.100.32
Port:           5060
Auth-User:      1004
Auth-Realm:     sofia.superpipi.cn
MWI-Account:    1004@sofia.superpipi.cn
Call-ID:        YTFjZjBmZDZjNWEyZGQwNTgxMTEzZDcwMTAwNDdiZDQ.
User:           1000@sofia.superpipi.cn
Contact:        "1000" <sip:1000@172.16.100.251:51540;rinstance=f8dca36459b0bdec>
Agent:          eyeBeam release 1011d stamp 40820
Status:         Registered(UDP)(unknown) EXP(2018-09-23 22:35:27) EXPSECS(3486)
Ping-Status:    Reachable
Ping-Time:      0.00
Host:           debian
IP:             172.16.100.32
Port:           5060
Auth-User:      1000
Auth-Realm:     sofia.superpipi.cn
MWI-Account:    1000@sofia.superpipi.cn
Call-ID:        SdnqWECcxy
User:           1002@sofia.superpipi.cn
Contact:        "" <sip:1002@172.16.100.251:64242;transport=udp>
Agent:          Linphone Desktop/4.1.1 (belle-sip/1.6.3)
Status:         Registered(UDP)(unknown) EXP(2018-09-23 21:47:38) EXPSECS(617)
Ping-Status:    Reachable
Ping-Time:      0.00
Host:           debian
IP:             172.16.100.32
Port:           5060
Auth-User:      1002
Auth-Realm:     sofia.superpipi.cn
MWI-Account:    1002@sofia.superpipi.cn
Call-ID:        NzBhNzg3NTY2NWExZmE0M2ZiODdlZGIwYmY1NGVmY2Y.
User:           1003@sofia.superpipi.cn
Contact:        "" <sip:1003@172.16.100.251:5060;rinstance=b0fff9289f8fbf0c>
Agent:          HUAWEI OpenEye v3.1
Status:         Registered(UDP)(unknown) EXP(2018-09-23 21:42:52) EXPSECS(331)
Ping-Status:    Reachable
Ping-Time:      0.00
Host:           debian
IP:             172.16.100.32
Port:           5060
Auth-User:      1003
Auth-Realm:     sofia.superpipi.cn
MWI-Account:    1003@sofia.superpipi.cn
Total items returned: 4
=================================================================================================
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4.3、通话验证

  • 使用分机1000拨通1003

172.16.100.10（FS1）节点收到分机1000发来的”INVITE”消息，并向分机1003发起”INVITE”消息，消息跟踪如下（注：删除了SDP和省略部分消息）：

recv 1431 bytes from udp/[172.16.100.32]:5060 at 21:48:29.481716:
   ------------------------------------------------------------------------
   INVITE sip:1003@sofia.superpipi.cn SIP/2.0
   Record-Route: <sip:172.16.100.32;lr;ftag=f104f441;did=83f.44ccd293>
   Via: SIP/2.0/UDP 172.16.100.32:5060;branch=z9hG4bKc6fd.c55828d7.0
   Via: SIP/2.0/UDP 172.16.100.251:51540;received=172.16.100.251;branch=z9hG4bK-d87543-8651904ed85c056f-1--d87543-;rport=51540
   Max-Forwards: 69
   Contact: <sip:1000@172.16.100.251:51540>
   To: "1003"<sip:1003@sofia.superpipi.cn>
   From: "1000"<sip:1000@sofia.superpipi.cn>;tag=f104f441
   Call-ID: NDkyOTM1YWI4YzhiMGY4MWI0ZDMwYmQzNThjYjE2NzQ.
   CSeq: 2 INVITE
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO
   Content-Type: application/sdp
   Proxy-Authorization: Digest username="1000",realm="sofia.superpipi.cn",nonce="e9c8201d-3c8a-461b-a86c-4719edc9cae3",uri="sip:1003@sofia.superpipi.cn",response="07eca040fed8f8ecfb7392671af7cc20",cnonce="44bb05f0c983e2e22b491a7bc82f0ab6",nc=00000001,qop=auth,algorithm=MD5
   User-Agent: eyeBeam release 1011d stamp 40820
   Content-Length: 442

   ------------------------------------------------------------------------
send 354 bytes to udp/[172.16.100.32]:5060 at 21:48:29.502215:
   ------------------------------------------------------------------------
   SIP/2.0 100 Trying
   Via: SIP/2.0/UDP 172.16.100.32:5060;branch=z9hG4bKc6fd.c55828d7.0
   From: "1000"<sip:1000@sofia.superpipi.cn>;tag=f104f441
   To: "1003"<sip:1003@sofia.superpipi.cn>
   Call-ID: NDkyOTM1YWI4YzhiMGY4MWI0ZDMwYmQzNThjYjE2NzQ.
   CSeq: 2 INVITE
   User-Agent: FreeSWITCH-mod_sofia/1.8.1+git~20180724×××60524Z~b33bc925c5~64bit
   Content-Length: 0

   ------------------------------------------------------------------------
send 1272 bytes to udp/[172.16.100.251]:5060 at 21:48:30.575115:
   ------------------------------------------------------------------------
   INVITE sip:1003@172.16.100.251:5060;rinstance=b0fff9289f8fbf0c SIP/2.0
   Via: SIP/2.0/UDP 172.16.100.10;rport;branch=z9hG4bKg7X53ye14956r
   Max-Forwards: 68
   From: "Extension 1000" <sip:1000@sofia.superpipi.cn>;tag=9e7rDt1XcyNZc
   To: <sip:1003@172.16.100.251:5060;rinstance=b0fff9289f8fbf0c>
   Call-ID: 326006cf-39da-1237-4983-000c2953a0b0
   CSeq: 128519191 INVITE
   Contact: <sip:mod_sofia@172.16.100.10:5060>
   User-Agent: FreeSWITCH-mod_sofia/1.8.1+git~20180724×××60524Z~b33bc925c5~64bit
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: timer, path, replaces
   Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
   Content-Type: application/sdp
   Content-Disposition: session
   Content-Length: 246
   X-FS-Support: update_display,send_info
   Remote-Party-ID: "Extension 1000" <sip:1000@sofia.superpipi.cn>;party=calling;screen=yes;privacy=off

   ------------------------------------------------------------------------
recv 318 bytes from udp/[172.16.100.251]:5060 at 21:48:30.634089:
   ------------------------------------------------------------------------
   SIP/2.0 100 Trying
   Via: SIP/2.0/UDP 172.16.100.10;rport=5060;branch=z9hG4bKg7X53ye14956r
   To: <sip:1003@172.16.100.251:5060;rinstance=b0fff9289f8fbf0c>
   From: "Extension 1000" <sip:1000@sofia.superpipi.cn>;tag=9e7rDt1XcyNZc
   Call-ID: 326006cf-39da-1237-4983-000c2953a0b0
   CSeq: 128519191 INVITE
   Content-Length: 0

   ------------------------------------------------------------------------
recv 399 bytes from udp/[172.16.100.251]:5060 at 21:48:30.634221:
   ------------------------------------------------------------------------
   SIP/2.0 180 Ringing
   Via: SIP/2.0/UDP 172.16.100.10;rport=5060;branch=z9hG4bKg7X53ye14956r
   Contact: <sip:1003@172.16.100.251:5060;rinstance=b0fff9289f8fbf0c>
   To: <sip:1003@172.16.100.251:5060;rinstance=b0fff9289f8fbf0c>;tag=77eb678a
   From: "Extension 1000"<sip:1000@sofia.superpipi.cn>;tag=9e7rDt1XcyNZc
   Call-ID: 326006cf-39da-1237-4983-000c2953a0b0
   CSeq: 128519191 INVITE
   Content-Length: 0
   ------------------------------------------------------------------------
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  • 使用分机1002拨打1004

在1000与1003通话状态下，使用分机1002拨打1004，172.16.100.11（FS2）节点收到分机1002发来的”INVITE”消息，并向分机1004发起”INVITE”消息，消息跟踪如下（注：删除了SDP和省略部分消息）：

recv 1935 bytes from udp/[172.16.100.32]:5060 at 21:54:32.072291:
   ------------------------------------------------------------------------
   INVITE sip:1004@sofia.superpipi.cn SIP/2.0
   Record-Route: <sip:172.16.100.32;lr;ftag=0HIj01pcT;did=cdf.8df222c6>
   Via: SIP/2.0/UDP 172.16.100.32:5060;branch=z9hG4bKc54a.a53a6847.0
   Via: SIP/2.0/UDP 172.16.100.251:64242;received=172.16.100.251;branch=z9hG4bK.m5Jiasf70;rport=64242
   From: <sip:1002@sofia.superpipi.cn>;tag=0HIj01pcT
   To: sip:1004@sofia.superpipi.cn
   CSeq: 21 INVITE
   Call-ID: LJD8EMDXo0
   Max-Forwards: 69
   Supported: replaces, outbound
   Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO, UPDATE
   Content-Type: application/sdp
   Content-Length: 898
   Contact: <sip:1002@172.16.100.251:64242;transport=udp>;+sip.instance="<urn:uuid:bcb91990-4d9b-47ea-8ba8-3af172d27fce>"
   User-Agent: Linphone Desktop/4.1.1 (belle-sip/1.6.3)
   Proxy-Authorization:  Digest realm="sofia.superpipi.cn", nonce="771a93e4-504d-410e-b5ca-4b927a297b61", algorithm=MD5, username="1002",  uri="sip:1004@sofia.superpipi.cn", response="ed40318d6162ef2a623f8f3049995a99", cnonce="3zQAEkGGvoZhNjcE", nc=00000001, qop=auth
   ------------------------------------------------------------------------
send 308 bytes to udp/[172.16.100.32]:5060 at 21:54:32.098044:
   ------------------------------------------------------------------------
   SIP/2.0 100 Trying
   Via: SIP/2.0/UDP 172.16.100.32:5060;branch=z9hG4bKc54a.a53a6847.0
   From: <sip:1002@sofia.superpipi.cn>;tag=0HIj01pcT
   To: sip:1004@sofia.superpipi.cn
   Call-ID: LJD8EMDXo0
   CSeq: 21 INVITE
   User-Agent: FreeSWITCH-mod_sofia/1.8.1+git~20180724×××60524Z~b33bc925c5~64bit
   Content-Length: 0

   ------------------------------------------------------------------------
send 1427 bytes to udp/[172.16.100.110]:6060 at 21:54:33.154929:
   ------------------------------------------------------------------------
   INVITE sip:1004@172.16.100.110:6060 SIP/2.0
   Via: SIP/2.0/UDP 172.16.100.11;rport;branch=z9hG4bKecU1j8vy36H9r
   Max-Forwards: 68
   From: "Extension 1002" <sip:1002@sofia.superpipi.cn>;tag=v4c83jm6gtF0H
   To: <sip:1004@172.16.100.110:6060>
   Call-ID: 0a7d51fd-39db-1237-2d8d-000c29916959
   CSeq: 128519372 INVITE
   Contact: <sip:mod_sofia@172.16.100.11:5060>
   User-Agent: FreeSWITCH-mod_sofia/1.8.1+git~20180724×××60524Z~b33bc925c5~64bit
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: timer, path, replaces
   Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
   Content-Type: application/sdp
   Content-Disposition: session
   Content-Length: 455
   X-FS-Support: update_display,send_info
   Remote-Party-ID: "Extension 1002" <sip:1002@sofia.superpipi.cn>;party=calling;screen=yes;privacy=off
   ------------------------------------------------------------------------
recv 378 bytes from udp/[172.16.100.110]:6060 at 21:54:33.338614:
   ------------------------------------------------------------------------
   SIP/2.0 100 Trying
   Via: SIP/2.0/UDP 172.16.100.11;rport=5060;branch=z9hG4bKecU1j8vy36H9r
   From: "Extension 1002" <sip:1002@sofia.superpipi.cn>;tag=v4c83jm6gtF0H
   To: <sip:1004@172.16.100.110:6060>
   Call-ID: 0a7d51fd-39db-1237-2d8d-000c29916959
   CSeq: 128519372 INVITE
   Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, INFO, PRACK, UPDATE, MESSAGE
   Content-Length: 0

   ------------------------------------------------------------------------
recv 349 bytes from udp/[172.16.100.31]:5062 at 21:54:33.541289:
   ------------------------------------------------------------------------
   OPTIONS sip:172.16.100.11 SIP/2.0
   Via: SIP/2.0/UDP 172.16.100.31:5062;branch=z9hG4bKe86c.f1b595f2.0
   To: sip:172.16.100.11
   From: <sip:dispatcher@localhost>;tag=5f8cfd923bd21a2d7f298654cd327b22-a1e0
   CSeq: 14 OPTIONS
   Call-ID: 2d922c18059b1ee6-1684@172.16.100.32
   Max-Forwards: 70
   Content-Length: 0
   User-Agent: OpenSIPS (2.4.2 (x86_64/linux))

   ------------------------------------------------------------------------
send 735 bytes to udp/[172.16.100.31]:5062 at 21:54:33.542155:
   ------------------------------------------------------------------------
   SIP/2.0 200 OK
   Via: SIP/2.0/UDP 172.16.100.31:5062;branch=z9hG4bKe86c.f1b595f2.0
   From: <sip:dispatcher@localhost>;tag=5f8cfd923bd21a2d7f298654cd327b22-a1e0
   To: <sip:172.16.100.11>;tag=XD605D59D35jD
   Call-ID: 2d922c18059b1ee6-1684@172.16.100.32
   CSeq: 14 OPTIONS
   Contact: <sip:172.16.100.11>
   User-Agent: FreeSWITCH-mod_sofia/1.8.1+git~20180724×××60524Z~b33bc925c5~64bit
   Accept: application/sdp
   Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
   Supported: timer, path, replaces
   Allow-Events: talk, hold, conference, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer
   Content-Length: 0

   ------------------------------------------------------------------------
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五、后记

OpenSIPS通过keepalived进行主备切换高可用，再对FreeSWITCH进行负载均衡的试验算是完成，但还有一些地方需要进一部完善，比如sip消息中的From: <sip:dispatcher@localhost>，还有官方提到的来电的IP地址只能记录到OpenSIPS的IP问题，还有OpenSIPS代理媒体的问题，还有OpenSIPS可用性检测脚本等。

总之，在生产应用FreeSWITCH，高可用方案是必须要考虑的，上一篇折腾笔记已经介绍了通过keepalived进行FreeSWITCH主备切换的高可用，这里再把负载均衡的高可用方式折腾一番。也许你会问：为何不采用官方的”Corosync+Pacemaker“方式进行主备切换的高可用，主要是因为我对keepalived较熟悉一点，同时”keepalived+检测脚本“的切换效率也是很高的。