I am seeing 2 problems with nathelper and rtpproxy. One I have seen mentioned on the list but no solution or explainations that I can find.
 
1. I am seeing the following in my messages file
Oct 29 11:01:34 serv1 ser[9229]: ERROR: extract_mediaip: no `c=' in SDP
Oct 29 11:01:35 serv1 ser[9229]: ERROR: extract_mediaip: no `c=' in SDP
Oct 29 11:01:36 serv1 ser[9227]: ERROR: extract_mediaip: no `c=' in SDP
 
2. In some situations the BYE messages don't hangup the call
 
 
I am using yesterday unstable CVS tree. Client I am using in the test lab are Budgetone and x-lite softphones
 
and hear is my ser.cfg
 
Thanks
 
#
# $Id: ser.cfg,v 1.21 2003/06/04 13:47:36 jiri Exp $
#
# simple quick-start config script
#
 
# ----------- global configuration parameters ------------------------
 
/* Uncomment these lines to enter debugging mode
debug=3         # debug level (cmd line: -dddddddddd)
fork=yes
log_stderror=no # (cmd line: -E)
*/
 
# /* Uncomment these lines to enter debugging mode
debug=10
fork=yes
log_stderror=no
# */
 
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"
 
alias=mydomain.dyndns.org
 
# ------------------ 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/nathelper.so"
loadmodule "/usr/local/lib/ser/modules/textops.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"
 
# 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"
 
# ----------------- 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)
 
# -------------------------  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;
        };
 
        # 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
        record_route();
        # loose-route processing
        if (loose_route()) {
                t_relay();
                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") {
                        force_rport();
                        fix_nated_contact();
                        save("location");
# Uncomment this if you want to use digest authentication
#                       if (!www_authorize("iptel.org", "subscriber")) {
#                               www_challenge("iptel.org", "0");
#                               break;
#                       };
 
                        save("location");
                        break;
                };
 
                # native SIP destinations are handled using our USRLOC DB
                if (!lookup("location")) {
                        sl_send_reply("404", "Not Found");
                        break;
                };
        };
 
#inserted by klaus
       if (method=="INVITE") {
                record_route();
                force_rtp_proxy();
                /* set up reply processing */
                t_on_reply("1");
        };
 

        # forward to current uri now; use stateful forwarding; that
        # works reliably even if we forward from TCP to UDP
        if (!t_relay()) {
                sl_reply_error();
        };
 
}
 
#inserted by klaus
# all incoming replies for t_onrepli-ed transactions enter here
onreply_route[1] {
        if (status=~"2[0-9][0-9]")
                force_rtp_proxy();
}