[Serusers] Re: One Way Audio call

[Raymond May]

Hi, 
   I have just installed SER on my Linux Debian
server. It seems to work just great for users on the
Internet calling each other ( 2 way Audio is
successful ). However if someone calls me ( I am
behind my SER server ) they can hear me but I can't
hear them ( 1 way Audio ONLY ). Based on all the docs
I've read it seems to have something to do with NAT
and RTP ports.  My Phone connected to LAN --- SER
Server connected to my LAN on one interface and to DSL
Provider on the other ----  DSL Service Provider. I am
also doing NAT/PAT on SER server. Below is my Topology
and ser.cfg. Appreciate any feedback I get.


My Phone --- SER --- Internet --- Users that register
with my SER server. 

SER.CFG File
#
# $Id: ser.cfg,v 1.21.2.1 2003/07/30 16:46:18 andrei
Exp $
#
# simple quick-start config script
#

# ----------- 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
debug=7
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/lib/ser/modules/mysql.so"

loadmodule "/usr/lib/ser/modules/sl.so"
loadmodule "/usr/lib/ser/modules/nathelper.so"
loadmodule "/usr/lib/ser/modules/tm.so"
loadmodule "/usr/lib/ser/modules/rr.so"
loadmodule "/usr/lib/ser/modules/maxfwd.so"
loadmodule "/usr/lib/ser/modules/usrloc.so"
loadmodule "/usr/lib/ser/modules/registrar.so"

# Uncomment this if you want digest authentication
# mysql.so must be loaded !
#loadmodule "/usr/lib/ser/modules/auth.so"
#loadmodule "/usr/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 (len_gt( 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") {

# 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;
                };
        };
        # 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();
        };

}




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