Please check modules/nathelper/examples/alg.cfg for example on how to correctly configure nathelper+rtpproxy to work as an application-level gateway.

-Maxim

Karunakar Chemudugunta wrote:

Nope, I have down loaded latest rtpproxy and compiled on linux and running rtpproxy without any parameters on same machine of SER.

How to enable debug on rtpproxy ?

Do I need to pass any parameters for rtpproxy ???

Do I need to set any info regarding rtp proxy in ser.cfg file ?

Please find my attached ser.cfg which is usedfor this test.

Regards, KRC

On Fri, 9 Jul 2004 08:48:15 +0200, Andrei Pelinescu-Onciul pelinescu-onciul@fokus.fraunhofer.de wrote:

...

On Jul 08, 2004 at 17:17, Karunakar Chemudugunta voicexml@gmail.com wrote: [...]

...

SER is succussfully etablishing connection between two use agents and but it is failed to forward rtp between two UAs. No voice.

I assume, may be because of below errors.

Again thanks for help.

Regards, KRC

ERRORS

Jul 8 16:45:06 engcasip002 ser[18074]: ERROR: send_rtpp_command: can't read reply from a RTP proxy Jul 8 16:45:06 engcasip002 ser[18074]: WARNING: rtpp_test: can't get version of the RTP proxy

It looks like you don't have rtpproxy running. Start it :-)

Andrei

---

# # $Id: nathelper.cfg,v 1.1 2003/11/10 14:15:36 janakj Exp $ # # simple quick-start config script including nathelper support

# This default script includes nathelper support. To make it work # you will also have to install Maxim's RTP proxy. The proxy is enforced # if one of the parties is behind a NAT. # # If you have an endpoing in the public internet which is known to # support symmetric RTP (Cisco PSTN gateway or voicemail, for example), # then you don't have to force RTP proxy. If you don't want to enforce # RTP proxy for some destinations than simply use t_relay() instead of # route(1) # # Sections marked with !! Nathelper contain modifications for nathelper # # NOTE !! This config is EXPERIMENTAL ! # # ----------- 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 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" loadmodule "/usr/local/lib/ser/modules/textops.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"

# !! Nathelper loadmodule "/usr/local/lib/ser/modules/nathelper.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", "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)

# !! Nathelper modparam("registrar", "nat_flag", 6) modparam("nathelper", "natping_interval", 30) # Ping interval 30 s modparam("nathelper", "ping_nated_only", 1) # Ping only clients behind NAT

# ------------------------- 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", "Message too big"); break; };

   # !! Nathelper

# Special handling for NATed clients; first, NAT test is # executed: it looks for via!=received and RFC1918 addresses # in Contact (may fail if line-folding is used); also, # the received test should, if completed, should check all # vias for rpesence of received if (nat_uac_test("3")) { # Allow RR-ed requests, as these may indicate that # a NAT-enabled proxy takes care of it; unless it is # a REGISTER

if (method == "REGISTER" || ! search("^Record-Route:")) {
    log("LOG: Someone trying to register from private IP, rewriting\n");

    # This will work only for user agents that support symmetric
    # communication. We tested quite many of them and majority is
    # smart enough to be symmetric. In some phones it takes a configuration
    # option. With Cisco 7960, it is called NAT_Enable=Yes, with kphone it is
    # called "symmetric media" and "symmetric signalling".

    fix_nated_contact(); # Rewrite contact with source IP of signalling
    if (method == "INVITE") {
        fix_nated_sdp("1"); # Add direction=active to SDP
    };
    force_rport(); # Add rport parameter to topmost Via
    setflag(6);    # Mark as NATed
};

};

# 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=="REGISTER") record_route();

# subsequent messages withing a dialog should take the # path determined by record-routing if (loose_route()) { # mark routing logic in request append_hf("P-hint: rr-enforced\r\n"); route(1); break; };

if (!uri==myself) { # 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 (uri==myself) {

if (method=="REGISTER") {

# Uncomment this if you want to use digest authentication # if (!www_authorize("iptel.org", "subscriber")) { # www_challenge("iptel.org", "0"); # break; # };

	save("location");
	break;
};

lookup("aliases");
if (!uri==myself) {
	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] {

# if client or server know to be behind a NAT, enable relay if (isflagset(6)) { force_rtp_proxy(); };

# NAT processing of replies; apply to all transactions (for example, # re-INVITEs from public to private UA are hard to identify as # NATed at the moment of request processing); look at replies t_on_reply("1");

# send it out now; use stateful forwarding as it works reliably # even for UDP2TCP if (!t_relay()) { sl_reply_error(); }; }

# !! Nathelper onreply_route[1] { # NATed transaction ? if (isflagset(6) && status =~ "(183)|2[0-9][0-9]") { fix_nated_contact(); force_rtp_proxy(); # otherwise, is it a transaction behind a NAT and we did not # know at time of request processing ? (RFC1918 contacts) } else if (nat_uac_test("1")) { fix_nated_contact(); }; }

---

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