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。
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
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
}
}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
}
}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
更新源和安装OpenSIPS
apt-get update && apt-get install opensips
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
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
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
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();
}
}添加负载节点
在数据库添加两个负载节点信息
INSERT INTO `opensips`.`load_balancer` (`id`, `group_id`, `dst_uri`, `resources`, `probe_mode`, `description`) VALUES ('1', '1', 'sip:172.16.100.10', 'vm=100;conf=100;transc=100;pstn=500', '1', 'FS1');
INSERT INTO `opensips`.`load_balancer` (`id`, `group_id`, `dst_uri`, `resources`, `probe_mode`, `description`) VALUES ('2', '1', 'sip:172.16.100.11', 'vm=100;conf=100;transc=100;pstn=500', '1', 'FS2');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
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
3.2.3、开始OpenSIPS
重启rsyslog、keepalived、OpenSIPS
service rsyslog restart service keepalived restart service opensips restart
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'
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 ------------------------------------------------------------------------
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"/>
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 =================================================================================================
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 ------------------------------------------------------------------------
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 ------------------------------------------------------------------------
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。
