[Serusers] Fork
Jiri Kuthan
jiri at iptel.org
Tue May 4 09:32:01 CEST 2004
At 09:29 AM 5/4/2004, Kapil Dhawan wrote:
>Hi
>
>I am using the stable version of SER and rtpproxy....it is working fine as such and i am able to get phones registered.....and can make calls....Now....if i use fork=no with the same file....SER is unable to process Register Requests...
so set fork=yes
>it does nothin for a register request...it just doesn't respond but for fork=yes it works correctly....i know fork is used to fork the request to more than one locations..
the config option 'fork' is unrelated to SIP forking, it is a debugging mode in which
children processes are nto forked.
-jiri
>Could u pls clarify it....
>
>
>Second...i am using two grandstream phones and i can talk....but if i make a call from third phone to any of two..instead of busy tone...i get Ring...on the caller as well as callee side....
>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=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]
>{
> # !! 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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--
Jiri Kuthan http://iptel.org/~jiri/
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