[Serusers] Ser, Cisco and NAT
Victor Chan
vchan67 at hotmail.com
Fri Dec 31 08:16:48 CET 2004
Hi,
It works now. Thanks a lot.
Victor
>From: "Matt Schulte" <mschulte at netlogic.net>
>To: "Victor Chan" <vchan67 at hotmail.com>,<serusers at lists.iptel.org>
>Subject: RE: [Serusers] Ser, Cisco and NAT
>Date: Thu, 30 Dec 2004 09:10:31 -0600
>
>I've never used a 5300 but if I had a guess it would be that the 5300
doesn't realize that the RTP is NAT'd (and should send to a proxy). In
other words it may not be sending to your rtpproxy correctly if at all? Do
a debug on all devices, ensure the RTP ports match up. Does rtpproxy report
any errors such as no payload? You can do an 'rtpproxy -f' to run it at
command line.
>
>Looking at your config you have a lot of stuff being done before you relay
to the 5300, not to mention you have 'forward' under your t_relay..?? Have
you tried just sending to route(1) ?? That's where all your 'if natted'
statements should be. That way on_reply gets caught correctly as well.
>
>
>ie:
>
> if ( uri=~"^sip:9[0-9]*@5300_IP" ) {
> log(1, "SER22: matched - forward to GW\n");
> rewritehostport ("5300_IP:5060");
> route(1)
> break;
> };
>
>
>-----Original Message-----
>From: Victor Chan [mailto:vchan67 at hotmail.com]
>Sent: Wednesday, December 29, 2004 8:11 PM
>To: serusers at lists.iptel.org
>Subject: [Serusers] Ser, Cisco and NAT
>
>
>I have some problem about Cisco and NAT device. I have SER and rtpproxy
>running on a server. Call is made from a SIP endpoint device to Cisco 5300
>gateway via SER. But voice can't hear at my SIP device. I try point to
>point call without going to Cisco gateway, both side can hear. Please give
>advise to solve it. Thanks a lot.
>
>
>The following is my ser.cfg
>
>#
># $Id: nathelper.cfg,v 1.1.2.1 2003/11/24 14:47:18 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= 7 # 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
> log(1, "loose_route processing\n");
> append_hf("P-hint: rr-enforced\r\n");
> t_relay();
> 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") {
> save("location");
> break;
> };
> lookup("aliases");
> if (!uri==myself) {
> append_hf("P-hint: outbound alias\r\n");
> route(1);
> break;
> };
> if ( uri=~"^sip:9[0-9]*@5300_IP" ) {
> log(1, "SER22: matched - forward to GW\n");
> fix_nated_sdp("2");
> force_rtp_proxy("5300_IP");
> rewritehostport ("5300_IP:5060");
> t_relay_to_udp("5300_IP","5060");
> forward(5300_IP, 5060);
> break;
> };
> 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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