RE: [Serusers] rtpproxy

Jan,

Thanks for the reply. I did change the parameter to 0 and saw the natping packets being sent out. I did find that cisco in 6.3 Pix code addresses SIP with NAT/PAT http://cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_exa mple09186a00801fc74a.shtml

Im guessing this could be the cause that its not seeing my clients behind NAT as being behind a NAT.... ?

Thanks,

Harold

-----Original Message----- From: Jan Janak [mailto:jan@iptel.org] Sent: Monday, June 07, 2004 3:27 AM To: Harold Workman Cc: serusers@lists.iptel.org Subject: Re: [Serusers] rtpproxy

Maybe SER does not detect your x-lite as behind NAT. Try to set ping_nated_only parameter to 0, re-register x-lite and see if it receives any natping packets (or if ser sends them).

Jan.

On 03-06 12:33, Harold Workman wrote:

Hi,

I am still having some problems with users behind NAT. I am using X-Lite

and

forcing it as Symmetric Firewall. For testing I am using the

nathelper.cfg

from CVS folder with only additions of mysql. Calling from X-Lite sound

works

fine. If the X-Lite sits idle for over a minute I am unable to make a

call to

the X-Lite. I ran ethereal but am not seeing any packets pertaining to rtpproxy which should be every 10 seconds. I also read the README for

rtpproxy

and it doesnt look up to date. It says to run rtpproxy type rtpproxy -s <proto>:<address>[:<port>] What is the correct way to run

rtpproxy

and is there up to date documentation on rtpproxy? I added my ser.cfg to

the

email as well...

Thanks for your help in advance

debug=8 # debug level (cmd line: -dddddddddd) fork=yes log_stderror=yes # (cmd line: -E)

/* Uncomment these lines to enter debugging mode fork=yes log_stderror=yes */

listen=64.72.107.4 listen=127.0.0.1

# hostname matching an alias will satisfy the condition uri==myself". alias=cytelcom.com alias=64.72.107.4

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)

# database location modparam("usrloc", "db_url", "sql://ser:n0kia12@localhost/ser")

# -- 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")

# database location modparam("auth_db", "db_url", "sql://ser:n0kia12@localhost/ser")

# -- 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", 10) # Ping interval 10 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("cytelcom.com", "subscriber")) { www_challenge("cytelcom.com", "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] { # !! Nathelper if (uri=~"[@:](192.168.|10.|172.(1[6-9]|2[0-9]|3[0-1]).)" && !search("^Route:")){ sl_send_reply("479", "We don't forward to private IP addresses"); break; };

# 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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