[Serusers] nathelper ERROR: extract_mediaip: no `c=' in SDP
Java Rockx
javarockx at gmail.com
Fri Feb 18 03:37:41 CET 2005
Charles,
Not all reply messages have an SDP payload so I got around this
problem by checking the content length header
onreply_route[1] {
if (status=~"(180)|(183)|(2[0-9][0-9])" &&
!search("^Content-Length:\ 0")) {
# nathelper stuff goes here
};
}
Regards,
Paul
On Fri, 18 Feb 2005 10:25:34 +0800, Charles Wang <lazy.charles at gmail.com> wrote:
> Thanks Marian's help and answer. I can make a call from domainA to
> domainB via PDT module.
>
> But I got another error message from nathelper or rtpproxy.
> It is "ERROR: extract_mediaip: no `c=' in SDP" from /var/log/messages.
> I also find this message at source code of nathelper. So I think it
> should happen from this module.
>
> It seems voice channel can't pass throught it.
> I make a call from UA_A ( under NAT ) from domainA and using PDT to
> redirect to UA_B via domainB. UA_B has ring and it can answer. I can
> hear the UA_A's sound from UA_B. The sound of UA_B is failed to UA_A.
>
> UA_A(NAT) ==> domainA(PDT) ==> domainB(nathelper+rptproxy) ==> UA_B(NAT)
> SOUND_A ==========================================> UA_B
> UA_A <===== XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX === SOUND_B
>
> Do I put the prefix2domain() in a wrong place?? Or Is it a bug ofi
> nathelper & rtpproxy?
>
> And my ser.cfg as below:
>
> Best Regard.
> Charles
>
> #
> # $Id: ser.cfg,v 1.25 2004/11/30 16:28:24 andrei Exp $
> #
> # simple quick-start config script
> #
>
> # ----------- global configuration parameters ------------------------
>
> debug=8 # 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
> */
>
> listen=xxx.xxx.xxx.xxx
>
> alias=ser.xxx.net
> alias=ser
> alias=xxx.xxx.xxx.xxx
>
> check_via=no # (cmd. line: -v)
> dns=no # (cmd. line: -r)
> rev_dns=no # (cmd. line: -R)
> port=5060
> children=4
> fifo_mode=0666
> fifo="/tmp/ser_fifo"
> fifo_db_url="mysql://ser:heslo@localhost/ser"
>
> # ------------------ 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"
>
> loadmodule "/usr/local/lib/ser/modules/exec.so"
> loadmodule "/usr/local/lib/ser/modules/avpops.so"
> loadmodule "/usr/local/lib/ser/modules/domain.so"
> loadmodule "/usr/local/lib/ser/modules/group.so"
> loadmodule "/usr/local/lib/ser/modules/uri.so"
> loadmodule "/usr/local/lib/ser/modules/uri_db.so"
> loadmodule "/usr/local/lib/ser/modules/permissions.so"
> loadmodule "/usr/local/lib/ser/modules/speeddial.so"
> loadmodule "/usr/local/lib/ser/modules/acc.so"
> loadmodule "/usr/local/lib/ser/modules/pdt.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)
> modparam("usrloc", "db_mode", 1)
>
> # -- 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 params --
> 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
>
> # -- db_url params --
> modparam("acc|auth_db|domain|group|permissions|speeddial|uri_db|usrloc|pdt",
> "db_url", "mysql://ser:heslo@localhost/ser")
>
> # -- use_domain params --
> modparam("auth_db|group|registrar|speeddial|uri_db|usrloc", "use_domain", 0)
>
> # -- permissions params --
> modparam("permissions", "db_mode", 1)
> modparam("permissions", "trusted_table", "trusted")
>
> # -- accounting params --
> modparam("acc", "db_flag", 1)
> modparam("acc", "db_missed_flag", 1)
> modparam("acc", "log_fmt", "cdfimorstup")
> modparam("acc", "log_level", 1)
> modparam("acc", "failed_transactions", 1)
> modparam("acc", "report_cancels", 1)
> modparam("acc", "report_ack", 0)
>
> # -- domain params --
> modparam("domain", "db_mode", 1)
>
> # -- avp params --
> modparam("avpops", "avp_url", "mysql://ser:heslo@localhost/ser")
> modparam("avpops", "avp_table", "usr_preferences")
> #modparam("avpops", "use_domain", "1")
> modparam("avpops", "uuid_column", "uuid")
> modparam("avpops", "username_column", "username")
> modparam("avpops", "domain_column", "domain")
> modparam("avpops", "attribute_column", "attribute")
> modparam("avpops", "value_column", "value")
> modparam("avpops", "type_column", "type")
> modparam("avpops", "avp_aliases",
> "voicemail=i:500;calltype=i:700;fwd_no_answer_type=i:701;fwd_busy_type=i:702")
> # To use more than one tables example
> #modparam("avpops", "db_scheme",
> "scheme1:table=subscriber;uuid_column=uuid;value_column=first_name")
>
> # -- tm params --
> modparam("tm", "fr_timer", 15)
> modparam("tm", "fr_inv_timer", 22)
> modparam("tm", "wt_timer", 5)
> modparam("tm", "fr_inv_timer_avp", "inv_timeout")
>
> # -- pft params --
> modparam("pdt", "db_table", "prefix_domain")
> modparam("pdt", "prefix", "")
> #modparam("pdt", "start_range", 2000)
> #modparam("pdt", "terminator", 0)
> modparam("pdt", "hsize_2pow", 2)
> modparam("pdt", "sync_time", 300)
> modparam("pdt", "clean_time", 600)
>
> # ------------------------- 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;
> };
>
> if (method=="INVITE" || method=="BYE") {
> setflag(1);
> };
>
> # !! 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("SER: 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;
> };
>
> prefix2domain();
>
> 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("ser.xxx.net", "subscriber")) {
> www_challenge("ser.xxx.net", "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();
> };
> }
>
> On Thu, 17 Feb 2005 12:49:10 +0100, Marian Dumitru
> <marian.dumitru at voice-sistem.ro> wrote:
> > Hi Charles,
> >
> > You have to use interdomain prefixes. Set on domainA a prefix for
> > recognizing dialed numbers in domainB.
> > The logic is like:
> > PrefixToB+numberInB at domainA -> numberinB at domainB
> >
> > you can do this directly from script or by using PDT module.
> >
> > Best regards,
> > Marian
>
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