Hi i checked it and implemented rtpproxy also....

now what i am doing is.....if i take sample conf for rtpproxy it works but if i put it in my ser.cfg it doens't. ring goes for device behind NAT but can't hear.

i am pasting my ser.cg for your reference...

i have written one call module also and its function is to work on call allow function, call deny, forward etc and it is working without including NAT moduel....but if i include NAT...public ip's can still talk but private can't only ring goes for them

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"

#added by kapil loadmodule "/usr/local/lib/ser/modules/call.so" loadmodule "/usr/local/lib/ser/modules/vm.so" # !! Nathelper loadmodule "/usr/local/lib/ser/modules/nathelper.so" #added by kapil # ----------------- 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(); # loose-route processing if (loose_route()) { # mark routing logic in request append_hf("P-hint: rr-enforced\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("", "subscriber")) { www_challenge("", "0"); break; };

save("location"); break; };

if (method=="INVITE" || method=="ACK" || method=="BYE" || method=="CANCEL") {

if(call_feature()){

if(uri=~"sip:7@") { if(!call_redial()) { sl_send_reply("404", "Not Found"); break; }; } else if(uri=~"sip:00*") { if(call_pstn()) { break; }; } else { if(!call_speeddial()) { sl_send_reply("404", "Not Found"); break; };

};

} else { if(!call_sip()){ 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

# forward to current uri now; use stateful forwarding; that # works reliably even if we forward from TCP to UDP

if(call_flag("1")) { if (!lookup("location")) { sl_send_reply("404", "Not Found"); break; };

if (!t_relay()) { sl_reply_error(); }; break; };

if(call_flag("2")) { break; };

if(call_flag("3")) { if (!t_newtran()) { log("could not create new transaction\n"); sl_send_reply("500","could not create new transaction"); break; }; t_reply("100","Trying -- just wait a minute !"); if(!vm("/tmp/am_fifo","voicemail")){ log("could not contact the answer machine\n"); t_reply("500","could not contact the answer machine"); }; break; }; }

# !! 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(); }; }

From: Atle Samuelsen clona@camaro.no To: Kapil Dhawan sersavvy@hotmail.com CC: serusers@lists.iptel.org Subject: Re: [Serusers] NAT Solution Date: Sat, 24 Apr 2004 12:18:55 +0200

Hi!

www.google.com and search for "ser +nat :host mail.iptel.org"

otherstuff, rtpproxy, mediaproxy etc.

btw. Check the list for common queristions :-)

-Atle

• Kapil Dhawan sersavvy@hotmail.com [040424 07:07]:

...

Hi

Could you pls suggest me some solution for implementing NAT. I have

almost

...

all the devices behind NAT. Pls suggest me that where can i get the documentation for that too...

Regards

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