参考文件：
http://blog.csdn.net/kl222/article/details/20145423
为什么要搭建TURN服务器？
因为我们编写的sip客户端再和南瑞的sip服务器进行通信的时候，中间经过一个安全平台，这个安全平台具有NAT和防火墙功能。RTP和RTCP包传递不了。所以要增加一个TURN服务器。同时在sip客户端侧要实现TURN客户端功能。
搭建TURN服务器的步骤：
要安装两个软件 libConfuse和TURN server
1，下载
别人说通过svn和git方式下载，但是这个地址都下载不下来，提示地址错误。我是在windows下访问下面的两个网站，直接下载的文件。
官网：http://turnserver.sourceforge.net/
官网: http://www.nongnu.org/confuse/
下载的两个文件如下：
confuse-2.7.tar.gz
turnserver-0.7.3.tar.bz2
2，传输
我在windows下面使用的是xshell， 配置xshell下面的ZMODEM的上传和下载目录，就可以使用rz命令向CentOS主机传输文件了。
我是在根目录下创建了一个turnserver目录。
mkdir turnserver
3，解压
tar -xzvf confuse-2.7.tar.gz
tar -jxvf turnserver-0.7.3.tar.bz2
解压后的目录如下：
4，编译安装confuse-2.7
cd confuse-2.7 ./configure //这里不要指定目录，使用默认目录进行安装。默认是安装在/usr/local目录下面。 make sudo make install
没有报错，安装成功。
5，编译安装turnserver-0.7.3
cd turnserver-0.7.3 ./configure //这里不要指定目录，使用默认目录进行安装。默认是安装在/usr/local目录下面。 make sudo make install
这两个只所以没有指定安装目录是因为设置了安装目录后，再安装turnserver的时候，提示前面的confuse没有安装。
6，熟悉、建立、修改配置文件。
6.1 在turnserver源码根目录下的extra目录下有配置模板可以参考。
turnserver.fedora.initd #fedora平台的启动脚本
turnserver.spec #fedora平台的启动脚本
turnserver.debian.initd #debian平台的启动脚本
turnserver.conf.template#配置文件
turnusers.txt.template #用户名、密码配置文件
6.2 建立配置文件：
[hy@localhost-turnserver]$ cd extra/
[hy@localhost-extra]$ cp turnserver.conf.template /usr/local/etc/turnserver.conf
[hy@localhost-extra]$ cp turnusers.txt.template /usr/local/etc/turnusers.txt
[hy@localhost-extra]$ cd /usr/local/etc
6.3修改配置文件
cd /usr/local/etc
chmod 777 turnserver.conf
chmod 777 turnusers.txt
vi turnserver.conf
listen_address = {"183.62.225.76" } #把对应公网网卡的IP地址写入(如果公网地址是用镜像的,则用镜像的那个IP地址)，一般只要改这个配置，其它的用默认值就可以了。
## Account method.
account_method = "file" #配置账户数据为文件
## Account file (if account_method = file).
account_file ="/usr/local/etc/turnusers.txt" #指定账户文件位置
[root@rlnf-76etc]# vi turnusers.txt
foo:bar:domain.org:authorized
用户名：密码：领域：需要验证的
领域的值应与配置文件(turnserver.conf)中的
## Realm value.
realm = "domain.org"
的值相同.这个值用于密码确认的.
7，启动turnserver
[root@rlnf-76etc]# cd ../sbin
[root@rlnf-76sbin]# ./turnserver -c /usr/local/etc/turnserver.conf
8 启动回显服务：
在服务器上启动回显测试服务端程序:
[root@rlnf-76bin]# ./test_echo_server
UDP Echo server started on port 4588
9 测试服务器是否正常
在其它机器上(客户机器)启动测试程序：
rdc@rdc-Virtual-Machine:/home/turnserver/src$./test_turn_client -t udp -s 183.62.225.76 -p 183.62.225.76 -w 4588 -u foo -g 1234-d domain.org
Protocol: udp (17) use TLS: 0.
sock: 3 speer: (nil) connected!
Send Allocate request.
Send Allocate request.
Probably wrong credentials or requestedfamily not supported.
这个是说权限错误，一般是用户或密码不对。修改用户和密码，再次运行：
rdc@rdc-Virtual-Machine:/home/turnserver/src$./test_turn_client -t udp -s 183.62.225.76 -p 183.62.225.76 -w 4588 -u foo -gbar -d domain.org
Protocol: udp (17) use TLS: 0.
sock: 3 speer: (nil) connected!
Send Allocate request.
Send Allocate request.
Allocate an address!
Send CreatePermission request.
Permission installed!
Send Send indication.
Receive data: 1024
Send CreatePermission request.
Channel bound to 16393.
Send ChannelData.
Received ChannelData: 1024 bytes
Send Refresh request.
Cleanup and exit.
10 服务端打印的日志：
15:44:26.632297 [turnserver_main:4509] Received UDP on listening address 15:44:26.632336[turnserver_listen_recv:3273] Nomessage integrity 15:44:26.636506 [turnserver_main:4509] Received UDP on listening address 15:44:26.636534[turnserver_listen_recv:3581] OK basicvalidation are done, process the TURN message 15:44:26.636546 [turnserver_process_turn:2942] Process a TURN message 15:44:26.636559[turnserver_process_allocate_request:2302] Allocate request received! 15:44:26.636573[turnserver_process_allocate_request:2536] lifetime: 165 seconds 15:44:26.636667 [turnserver_process_allocate_request:2767] Account foo, allocations used: 3 15:44:26.636719[turnserver_process_allocate_request:2903] Allocation successful, send success allocate response 15:44:26.640733 [turnserver_main:4509] Received UDP on listening address 15:44:26.640758[turnserver_listen_recv:3581] OK basicvalidation are done, process the TURN message 15:44:26.640770[turnserver_process_turn:2942] Process aTURN message 15:44:26.640781[turnserver_process_createpermission_request:1627] CreatePermission request received 15:44:26.640807[turnserver_process_createpermission_request:1767] Install permission for 183.62.225.76 4588 15:44:26.640828[turnserver_process_createpermission_request:1806] CreatePermission successful, send successCreatePermission response 15:44:26.645088 [turnserver_main:4509] Received UDP on listening address 15:44:26.645110[turnserver_listen_recv:3581] OK basicvalidation are done, process the TURN message 15:44:26.645121[turnserver_process_turn:2942] Process aTURN message 15:44:26.645131[turnserver_process_send_indication:1414] Send indication received! 15:44:26.645143[turnserver_check_bandwidth_limit:503] Tokendown bucket available: 150000, tokens requested: 1024 15:44:26.645154[turnserver_process_send_indication:1536] Will not set DF flag 15:44:26.645166[turnserver_process_send_indication:1567] Send data to peer 15:44:26.645224 [turnserver_main:4686] Received UDP on a relayed address 15:44:26.645241[turnserver_check_bandwidth_limit:477] Tokenup bucket available: 150000, tokens requested: 1024 15:44:26.645314[turnserver_relayed_recv:3722] Send datato client 15:44:26.649140 [turnserver_main:4509] Received UDP on listening address 15:44:26.649165[turnserver_listen_recv:3581] OK basicvalidation are done, process the TURN message 15:44:26.649177[turnserver_process_turn:2942] Process aTURN message 15:44:26.649187[turnserver_process_channelbind_request:1860] ChannelBind request received! 15:44:26.649199[turnserver_process_channelbind_request:1936] Client request a ChannelBinding for 183.62.225.76 4588 15:44:26.649234[turnserver_process_channelbind_request:2055] ChannelBind successful, send success ChannelBind response 15:44:26.653515 [turnserver_main:4509] Received UDP on listening address 15:44:26.653532[turnserver_process_channeldata:1239] ChannelData received! 15:44:26.653544[turnserver_check_bandwidth_limit:503] Tokendown bucket available: 150000, tokens requested: 1024 15:44:26.653557[turnserver_process_channeldata:1366] Send ChannelData to peer 15:44:26.653596 [turnserver_main:4686] Received UDP on a relayed address 15:44:26.653611[turnserver_check_bandwidth_limit:477] Tokenup bucket available: 150000, tokens requested: 1024 15:44:26.653623[turnserver_relayed_recv:3722] Send datato client 15:44:26.657563 [turnserver_main:4509] Received UDP on listening address 15:44:26.657586[turnserver_listen_recv:3581] OK basicvalidation are done, process the TURN message 15:44:26.657598[turnserver_process_turn:2942] Process aTURN message 15:44:26.657608[turnserver_process_refresh_request:2101] Refresh request received! 15:44:26.657618[turnserver_process_refresh_request:2146] lifetime: 0 seconds 15:44:26.657664[turnserver_process_refresh_request:2201] Account foo, allocations used: 2 15:44:26.657677[turnserver_process_refresh_request:2203] Explicit delete of allocation 15:44:26.657692[turnserver_process_refresh_request:2245] Refresh successful, send success refresh response