[Serusers] Problem running SER behind firewall
Wei Wang
wwang at m1global.com
Mon May 14 18:00:40 CEST 2007
I have a problem running SER behind firewall.
Here is the network diagram:
|UA1|--|FW1| +--|FW|--|SER|
\ /
+--+
/ \
|UA2|--|FW2| +--|MediaProxy|
Where, UA1 and UA2 are Xlite soft-phones behind their own firewalls. SER
is listening on private IP address 192.168.4.217. FW has public IP
address 66.134.1.34 and forwards port 5060 to SER.
The ser.cfg file is pretty much copied from SER getting start guide.
When UA1 calling UA2, the call established fine but UA1 will hang up by
itself after ~30 seconds. The captured IP packages on SER revealed that
the last ACK received from UA2 by SER was sent to FW IP address. Since
port 5060 is forwarded to SER on the FW, it caused a looping situation.
The ser.cfg is listed at the end.
Thanks in advance.
Wei Wang
wwang at m1global.com
======== ser.cfg ============
debug=3 # debug level (cmd line: -dddddddddd)
fork=yes
log_stderror=no # (cmd line: -E)
/* Uncomment these lines to enter debugging mode
debug=3
#debug=9
fork=no
log_stderror=yes
*/
check_via=no # (cmd. line: -v)
dns=no # (cmd. line: -r)
rev_dns=no # (cmd. line: -R)
listen=192.168.4.217
#listen=66.134.1.36
port=5060
children=4
fifo="/tmp/ser_fifo"
fifo_db_url="mysql://ser:s3rv1c3@localhost/ser"
# ------------------ module loading ----------------------------------
# Uncomment this if you want to use SQL database
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/textops.so"
loadmodule "/usr/local/lib/ser/modules/permissions.so"
# Uncomment this if you want digest authentication
# mysql.so must be loaded !
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/domain.so"
loadmodule "/usr/local/lib/ser/modules/mediaproxy.so"
loadmodule "/usr/local/lib/ser/modules/nathelper.so"
loadmodule "/usr/local/lib/ser/modules/print.so"
loadmodule "/usr/local/lib/ser/modules/xlog.so"
# ----------------- setting module-specific parameters ---------------
# -- usrloc params --
#modparam("usrloc", "db_mode", 0)
# Uncomment this if you want to use SQL database
# for persistent storage and comment the previous line
modparam("usrloc", "db_mode", 2)
# -- auth params --
# Uncomment if you are using auth module
#
modparam("auth_db|permissions|uri_db|usrloc", "db_url",
"mysql://ser:s3rv1c3@localhost/ser")
modparam("auth_db", "calculate_ha1", 1)
#
# If you set "calculate_ha1" parameter to yes (which true in this
config),
# uncomment also the following parameter)
#
modparam("auth_db", "password_column", "password")
modparam("nathelper", "rtpproxy_disable", 1)
modparam("nathelper", "natping_interval", 0)
modparam("mediaproxy", "natping_interval", 30)
#modparam("mediaproxy", "mediaproxy_socket", "/var/run/mediaproxy.sock")
modparam("mediaproxy", "mediaproxy_socket",
"/var/run/proxydispatcher.sock")
modparam("mediaproxy", "sip_asymmetrics",
"/usr/local/etc/ser/sip-clients")
modparam("mediaproxy", "rtp_asymmetrics",
"/usr/local/etc/ser/rtp-clients")
modparam("registrar", "nat_flag", 6)
# -- rr params --
# add value to ;lr param to make some broken UAs happy
modparam("rr", "enable_full_lr", 1)
modparam("permissions", "db_mode", 1)
modparam("permissions", "trusted_table", "trusted")
modparam("xlog", "buf_size", 8192)
# ------------------------- request routing logic -------------------
# main routing logic
route{
# xlog("L_INFO", "Main route
[From]%fu,[To]%tu,[Req-Method]%rm,[Req-RURI]%ru[IP-src]%is ...\n");
if(method != "SUBSCRIBE") {
xlog("L_INFO", "\r\n===========SIP
MSG==================\r\n%mb\r\n_____END SIP
MSG________________________\r\n");
};
# initial sanity checks -- messages with
# max_forwards==0, or excessively long requests
if (!mf_process_maxfwd_header("10")) {
sl_send_reply("483","Too Many Hops");
break;
};
if (msg:len >= 4086 ) {
sl_send_reply("513", "Message too big");
break;
};
# we record-route all messages -- to make sure that
# subsequent messages will go through our proxy; that's
# particularly good if upstream and downstream entities
# use different transport protocol
if (method == "INVITE" && client_nat_test("3")) {
# xlog("L_INFO", "method==INVITE and nated: calling
record_route_preset\n");
# IP ADDRESS Here
record_route_preset("66.134.1.34:5060;nat=yes");
} else if (method!="REGISTER") {
record_route();
};
# -------------------------
# Call Tear Down Section
#-------------------------
if(method=="BYE" || method=="CANCEL") {
#xlog("L_INFO", "RECEIVED BYE or CANCEL...");
end_media_session();
};
# subsequent messages withing a dialog should take the
# path determined by record-routing
if (loose_route()) {
xlog("L_INFO", "DEBUG: loose_route...");
if((method=="INVITE" || method == "REFER") &&
!has_totag()) {
sl_send_reply("403", "Forbidden");
break;
};
if(method == "INVITE") {
if(!allow_trusted()) {
if(!proxy_authorize("", "subscriber")) {
proxy_challenge("", "0");
break;
} else if(!check_from()) {
sl_send_reply("403", "Use
From=ID");
break;
};
consume_credentials();
}
if(client_nat_test("3")
|| search("^Route:.*;nat=yes")) {
setflag(6);
use_media_proxy();
};
};
# mark routing logic in request
#append_hf("P-hint: rr-enforced\r\n");
route(1);
break;
};
if (!uri==myself) {
route(4);
# mark routing logic in request
#append_hf("P-hint: outbound\r\n");
route(1);
break;
};
# if the request is for other domain use UsrLoc
# (in case, it does not work, use the following command
# with proper names and addresses in it)
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);
#append_hf("P-hint: outbound alias\r\n");
route(1);
break;
};
# native SIP destinations are handled using our USRLOC DB
if (!lookup("location")) {
sl_send_reply("404", "Not Found");
break;
};
append_hf("P-hint: usrloc applied\r\n");
route(1);
}
route[1]
{
t_on_reply("1");
# send it out now; use stateful forwarding as it works reliably
# even for UDP2TCP
if (!t_relay()) {
if(method=="INVITE" || method == "ACK") {
end_media_session();
};
sl_reply_error();
};
}
route[2]
{
############################
# REGISTER Message Handler
###########################
sl_send_reply("100", "Trying");
if(!search("^Contact:[ ]*\*") && client_nat_test("7")) {
setflag(6);
fix_nated_register();
force_rport();
};
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(client_nat_test("3")) {
setflag(7);
force_rport();
fix_nated_contact();
};
if(!allow_trusted()) {
if(!proxy_authorize("", "subscriber")) {
proxy_challenge("", "0");
break;
} else if(!check_from()) {
sl_send_reply("403", "Use From=ID");
break;
};
};
consume_credentials();
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) || isflagset(7)) {
if(!isflagset(8)) {
setflag(8);
use_media_proxy();
};
};
}
onreply_route[1] {
if((isflagset(6) || isflagset(7))
&& (status =~ "(180)|183)|2[0-9][0-9]")) {
if(!search("^Content-Length:[ ]*0")) {
use_media_proxy();
};
};
if(client_nat_test("1")) {
fix_nated_contact();
};
}
=============== END ser.cfg ================
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