小时候长话费尤其是国际长话费贵得惊人，几分钟就得１０多块几十块上百块的．由此也出现了不少守个公用电话做为小营生的小商人，倒是制造了或多或少的就业机会，当然那高额的利润究竟最后到了谁手上，就不知道了．
现在费用倒是明里暗里下降了不少，不过你要是有个必须每天打Ｎ通电话的重要人物在外地甚至在外国，话费的Ｎ倍还是吃不太消．就算不存乎，能省点也是几千年来的光荣传统不是？自己架个SIP Server，再用个phone 2 network类的设备，你想打Ｎ通就打Ｎ通，每通想打Ｎ久就打Ｎ久，如果你有那么多话说，不必再担心话费问题了．取而代之的，你可能要担心网费和电费的问题．
现在有不少几合一的家用路由交换一体的设备，都带有电话接口，设置好SIP帐号，接部普通电话就能用了．而最新的智能手机，带wifi功能的，也都基本支持SIP类软件，设置好帐号，直接用wifi通话，也要比走GSM,3G类的网络节省很多．
首先，官网下载源代码．BTW，只能在Linux下安装．Window下也有类似的程序，国产的就有不少，不过我没用过，不做评论．我个人仍然喜欢用开源的东西自己来编译．
下载 ser-0.9.6_src.tar.gz
tar vzxf ser-0.9.6_src.tar.gz
cd ser-0.9.6
修改Makefile,加入mysql支持
# if not set on the cmd. line or the env, exclude this modules:
exclude_modules?=cpl ext extcmd \
postgres snmp \
im \
jabber mysql \
cpl-c \
auth_radius group_radius uri_radius avp_radius \
pa
删除其中的mysql字样．
make all
make install
修改/usr/local/sbin/ser_mysql.sh，防止默认utf编码时．建立库失败．
查找
echo "creating database $1 ..."
sql_query <<EOF
create database $1;
use $1;
create database $1;行后加入
alter database ser character set latin1;
建立初始数据库,没有出错提示，会自动建立２４个表，而且其中大部分没用到．
make dbinstall or run /usr/local/sbin/ser_mysql.sh create
建立新用户
serctl add username@domin password email
安装语音代理rtpproxy,一样从http://www.iptel.org/ser/下载，make,make install就好
配置文件/usr/local/etc/ser/ser.cfg,配置mysql认证，以及NAT修正.
其他类型可在这查看
ftp://siprouter.teigre.com/pub/gettingstarted/configs/
# $Id: nat-rtpproxy.cfg 51 2006-01-31 13:28:04Z /CN=Paul Hazlett/emailAddress=paul@onsip.org $
debug=3
fork=yes
log_stderror=no
listen=192.0.2.13 # INSERT YOUR IP ADDRESS HERE
port=5060
children=4
dns=no
rev_dns=no
fifo="/tmp/ser_fifo"
fifo_db_url="mysql://ser:heslo@localhost/ser"
loadmodule "/usr/local/lib/ser/modules/mysql.so"
loadmodule "/usr/local/lib/ser/modules/sl.so"
loadmodule "/usr/local/lib/ser/modules/tm.so"
loadmodule "/usr/local/lib/ser/modules/rr.so"
loadmodule "/usr/local/lib/ser/modules/maxfwd.so"
loadmodule "/usr/local/lib/ser/modules/usrloc.so"
loadmodule "/usr/local/lib/ser/modules/registrar.so"
loadmodule "/usr/local/lib/ser/modules/auth.so"
loadmodule "/usr/local/lib/ser/modules/auth_db.so"
loadmodule "/usr/local/lib/ser/modules/uri.so"
loadmodule "/usr/local/lib/ser/modules/uri_db.so"
loadmodule "/usr/local/lib/ser/modules/nathelper.so"
loadmodule "/usr/local/lib/ser/modules/textops.so"
modparam("auth_db|uri_db|usrloc", "db_url", "mysql://ser:heslo@localhost/ser")
modparam("auth_db", "calculate_ha1", 1)
modparam("auth_db", "password_column", "password")
modparam("nathelper", "natping_interval", 30)
modparam("nathelper", "ping_nated_only", 1)
modparam("nathelper", "rtpproxy_sock", "unix:/var/run/rtpproxy.sock")
modparam("usrloc", "db_mode", 2)
modparam("registrar", "nat_flag", 6)
modparam("rr", "enable_full_lr", 1)
route {
# -----------------------------------------------------------------
# Sanity Check Section
# -----------------------------------------------------------------
if (!mf_process_maxfwd_header("10")) {
sl_send_reply("483", "Too Many Hops");
break;
};
if (msg:len > max_len) {
sl_send_reply("513", "Message Overflow");
break;
};
# -----------------------------------------------------------------
# Record Route Section
# -----------------------------------------------------------------
if (method!="REGISTER") {
record_route();
};
if (method=="BYE" || method=="CANCEL") {
unforce_rtp_proxy();
}
# -----------------------------------------------------------------
# Loose Route Section
# -----------------------------------------------------------------
if (loose_route()) {
if ((method=="INVITE" || method=="REFER") && !has_totag()) {
sl_send_reply("403", "Forbidden");
break;
};
if (method=="INVITE") {
if (!proxy_authorize("","subscriber")) {
proxy_challenge("","0");
break;
} else if (!check_from()) {
sl_send_reply("403", "Use From=ID");
break;
};
consume_credentials();
if (nat_uac_test("19")) {
setflag(6);
force_rport();
fix_nated_contact();
};
force_rtp_proxy("l");
};
route(1);
break;
};
# -----------------------------------------------------------------
# Call Type Processing Section
# -----------------------------------------------------------------
if (uri!=myself) {
route(4);
route(1);
break;
};
if (method=="ACK") {
route(1);
break;
} else if (method=="CANCEL") {
route(1);
break;
} else if (method=="INVITE") {
route(3);
break;
} else if (method=="REGISTER") {
route(2);
break;
};
lookup("aliases");
if (uri!=myself) {
route(4);
route(1);
break;
};
if (!lookup("location")) {
sl_send_reply("404", "User Not Found");
break;
};
route(1);
}
route[1] {
# -----------------------------------------------------------------
# Default Message Handler
# -----------------------------------------------------------------
t_on_reply("1");
if (!t_relay()) {
if (method=="INVITE" && isflagset(6)) {
unforce_rtp_proxy();
};
sl_reply_error();
};
}
route[2] {
# -----------------------------------------------------------------
# REGISTER Message Handler
# ----------------------------------------------------------------
if (!search("^Contact:[ ]*\*") && nat_uac_test("19")) {
setflag(6);
fix_nated_register();
force_rport();
};
sl_send_reply("100", "Trying");
if (!www_authorize("","subscriber")) {
www_challenge("","0");
break;
};
if (!check_to()) {
sl_send_reply("401", "Unauthorized");
break;
};
consume_credentials();
if (!save("location")) {
sl_reply_error();
};
}
route[3] {
# -----------------------------------------------------------------
# INVITE Message Handler
# -----------------------------------------------------------------
if (!proxy_authorize("","subscriber")) {
proxy_challenge("","0");
break;
} else if (!check_from()) {
sl_send_reply("403", "Use From=ID");
break;
};
consume_credentials();
if (nat_uac_test("19")) {
setflag(6);
}
lookup("aliases");
if (uri!=myself) {
route(4);
route(1);
break;
};
if (!lookup("location")) {
sl_send_reply("404", "User Not Found");
break;
};
route(4);
route(1);
}
route[4] {
# -----------------------------------------------------------------
# NAT Traversal Section
# -----------------------------------------------------------------
if (isflagset(6)) {
force_rport();
fix_nated_contact();
force_rtp_proxy();
}
}
onreply_route[1] {
if (isflagset(6) && status=~"(180)|(183)|2[0-9][0-9]") {
if (!search("^Content-Length:[ ]*0")) {
force_rtp_proxy();
};
};
if (nat_uac_test("1")) {
fix_nated_contact();
};
}
先启动rtpproxy,用ftp的用户权限
/usr/local/bin/rtpproxy -u ftp
启动ser
serctl start
停止ser
serctl start
查看注册用户
serctl ul show
