[Serusers] Record-Route behind NAT
Andrés Parra L.
apl_1980b at yahoo.com
Sat Sep 11 20:29:47 CEST 2004
I have a little problem, i need to force the UA
(outside NAT with public IP address) to send the BYE
messages
to my Sip Server so I can account them in the acc
table.
I use record_route() to acomplish that but the thing
is the
Record-Route field in the message that an UA recieve,
the IP address is
the SIP SERVER LOCAL IP ADDRESS BEHIND NAT
(Record-Route:
<sip:5000022 at 192.168.0.2;ftag=192550680;lr=on>)
which means, of course, that the message will not pass
trough the SIP Server.
How Could i force the server to write in the
Record-Route field the valid
IP address of my Sip Server (200.24.99.131)????
Example message sent by the Sip Proxy:
RECEIVE TIME: 1420109
RECEIVE << 200.24.99.131:5060
SIP/2.0 180 Ringing
Via: SIP/2.0/UDP
200.71.103.253:5060;rport=5060;branch=z9hG4bK725C92055C654839934F043974F39E1F
From: Andres Parra
<sip:3304076 at ipsofactum.com>;tag=192550680
To: <sip:5000022 at ipsofactum.com>;tag=2391513217
Contact: <sip:5000022 at 68.38.237.35:32805>
Record-Route:
<sip:5000022 at 192.168.0.2;ftag=192550680;lr=on>
Call-ID:
31517648-DF5F-4A12-BE74-5B1026B4C39D at 200.71.103.253
CSeq: 29855 INVITE
Server: X-Lite release 1103m
Content-Length: 0
Ser.cfg:
#
# $Id: ser.cfg,v 1.21.4.1 2003/11/10 15:35:15 andrei
Exp $
#
# simple quick-start config script
#
# ----------- global configuration parameters
------------------------
#debug=3 # debug level (cmd line: -dddddddddd)
#fork=yes
#log_stderror=no # (cmd line: -E)
/* Uncomment these lines to enter debugging mode
debug=7
fork=no
log_stderror=yes
*/
check_via=no # (cmd. line: -v)
dns=no # (cmd. line: -r)
rev_dns=no # (cmd. line: -R)
#port=5060
#children=4
fifo="/tmp/ser_fifo"
# ------------------ 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"
# 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/acc.so"
loadmodule "/usr/local/lib/ser/modules/textops.so"
# Uncomment this if you want to use SQL database
# ----------------- 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", "calculate_ha1", yes)
#
# If you set "calculate_ha1" parameter to yes (which
true in this config),
# uncomment also the following parameter)
#
modparam("auth_db", "password_column", "password")
# -- rr params --
# add value to ;lr param to make some broken UAs happy
modparam("rr", "enable_full_lr", 1)
# -- acc params -
modparam("acc", "log_missed_flag", 3)
modparam("acc", "log_level", 1)
modparam("acc", "log_flag", 1)
modparam("acc", "db_flag", 1)
modparam("acc", "db_missed_flag", 3)
# ------------------------- request routing logic
-------------------
# main routing logic
route{
# 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 > max_len ) {
sl_send_reply("513", "Mensaje demasiado grande");
break;
};
# prevents private ip space from being used
if (search("^(Contact|m):
.*@(192\.168\.|10\.|172\.16)")) {
if (method=="REGISTER") {
log(1, "LOG: Someone trying to register from
private IP\n");
sl_send_reply("479", "Por favor no utilice
direcciones IP privadas" );
break;
};
};
# loose-route processing
if (loose_route()) {
t_relay();
break;
};
# labeled all transaction for accounting
setflag(1);
# 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
# record-route INVITES to make sure BYEs will visit
our server too
if (method=="INVITE") record_route();
# 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 (uri=~"ipsofactum.com" ){#||
!(uri=~"^sip:(192\.168\.|10\.|172\.16)")) {
if (method=="REGISTER") {
# Uncomment this if you want to use digest
authentication
if (!www_authorize("ipsofactum.com", "subscriber"))
{
www_challenge("ipsofactum.com", "0");
break;
};
setflag(3);
save("location");
break;
};
# native SIP destinations are handled using our
USRLOC DB
if (!lookup("location")){ #&&
!lookup("subscribers")) {
# call invitations to off-line users are reported
using the
# acc_request action; to avoid duplicate
reports on request
# retransmissions, request is processed
statefuly (t_newtran,
# t_reply)
if ((method=="INVITE" || method=="ACK") &&
t_newtran() ) {
t_reply("404", "Usuario no registrado!,
contacte el directorio de usuarios registrados");
acc_db_request("404 Not
Found","missed_calls");
break;
};
# all other requests to off-line users are
simply replied
# statelesslyeth0 and no reports are issued
#sl_send_reply("404", "Usuario no existente!,
contacte el directorio de usuarios suscritos");
#break;
} else {
# user on-line; report on failed transactions;
mark the
# transaction for reporting using the same
number as
# configured above; if the call is really
missed, a report
# will be issued
setflag(3);
# forward to user's current destination
t_relay();
break;
};
};
# forward to current uri now; use stateful
forwarding; that
# works reliably even if we forward from TCP to UDP
if (!t_relay()) {
sl_reply_error();
};
}
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