Hi there: I have the following network diagram:

SER on the real IP | Internet ------------------------------------------------------------------------------- | | | | Liksys NAT Linux NAT PIX CISCO IOS | | | | Grand stream Grand stream Xlite PSTN XTEN PRO On the ser I am using a conguration with a mediaproxy module enabled. Here are some tests i did in this configuration and results:

1) Call from GS/NAT to GS/ NAT through SER/Mediaproxy worksk fine 2) Call from PSTN to a DIN assigned to a XLITE(behind any nat ) is fine 3) Calls from PSTN to a DIN assigned to a GS / NAT (Linux nat, Linksys nat ), only the phone ringing but meddia is not going through .

Here are my config files:

------------------------------------------------------------------------------ # # $Id: serconf.sh,v 1.2 2003/08/13 20:53:04 jiri Exp $ # # autogenerated SER configuration # # user: uid=500(ser) gid=500(ser) groups=500(ser) # system: Linux ast 2.6.5-1.358smp #1 SMP Sat May 8 09:25:36 EDT 2004 i686 i686 i386 GNU/Linux # date: Tue Oct 5 00:49:29 EDT 2004 #

# ----------- global configuration parameters ------------------------

debug=4 fork=yes port=5060 log_stderror=yes memlog=5

mhomed=yes

fifo="/tmp/ser_fifo"

alias=iptel.org

check_via=no # (cmd. line: -v) dns=no # (cmd. line: -r) rev_dns=yes # (cmd. line: -R) children=2 # if changing fifo mode to a more restrictive value, put # decimal value in there, e.g. dec(rw|rw|rw)=dec(666)=438 #fifo_mode=438

# ------------------ module loading ----------------------------------

loadmodule "/home/ser/lib/ser/modules/tm.so" loadmodule "/home/ser/lib/ser/modules/sl.so" #loadmodule "/home/ser/lib/ser/modules/acc.so" loadmodule "/home/ser/lib/ser/modules/rr.so" loadmodule "/home/ser/lib/ser/modules/maxfwd.so" loadmodule "/home/ser/lib/ser/modules/mysql.so" loadmodule "/home/ser/lib/ser/modules/usrloc.so" loadmodule "/home/ser/lib/ser/modules/registrar.so" loadmodule "/home/ser/lib/ser/modules/auth.so" loadmodule "/home/ser/lib/ser/modules/auth_db.so" loadmodule "/home/ser/lib/ser/modules/textops.so" loadmodule "/home/ser/lib/ser/modules/uri.so" loadmodule "/home/ser/lib/ser/modules/group.so" loadmodule "/home/ser/lib/ser/modules/msilo.so" loadmodule "/home/ser/lib/ser/modules/enum.so" # loadmodule "/home/ser/lib/ser/modules/nathelper.so" loadmodule "/home/ser/lib/ser/modules/mediaproxy.so" loadmodule "/home/ser/lib/ser/modules/domain.so" loadmodule "/home/ser/lib/ser/modules/xlog.so"

# ----------------- setting module-specific parameters --------------- # Media proxy ..

modparam("mediaproxy", "natping_interval", 60) modparam("mediaproxy", "mediaproxy_socket","/var/run/proxydispatcher.sock") modparam("mediaproxy", "sip_asymmetrics", "/home/ser/etc/ser/sip-asymmetrics-clients") modparam("mediaproxy", "rtp_asymmetrics", "/home/ser/etc/ser/rtp-asymmetrics-clients") modparam("registrar", "nat_flag", 2)

# all DB urls here modparam("usrloc|acc|auth_db|group|msilo|uri", "db_url", "sql://ser:heslo@localhost/ser")

# -- usrloc params -- /* 0 -- dont use mysql, 1 -- write_through, 2--write_back */ modparam("usrloc", "db_mode", 2) modparam("usrloc", "timer_interval", 10)

# -- auth params --

modparam("auth_db", "calculate_ha1", yes) #modparam("auth_db", "user_column", "user_id") modparam("auth_db", "password_column", "password") modparam("auth", "nonce_expire", 300)

# -- rr params -- # add value to ;lr param to make some broken UAs happy modparam("rr", "enable_full_lr", 1)

# -- acc params -- # that is the flag for which we will account -- don't forget to # modparam("acc", "db_flag", 1 ) # modparam("acc", "db_missed_flag", 3 )

# -- tm params -- modparam("tm", "fr_timer", 20 ) modparam("tm", "fr_inv_timer", 90 ) modparam("tm", "wt_timer", 20 )

# -- msilo params modparam("msilo", "registrar", "sip:registrar@iptel.org")

# -- enum params -- # # modparam("enum", "domain_suffix", "e164.arpa.")

modparam("xlog", "buf_size", 8192)

# ------------------------- request routing logic -------------------

# main routing logic

route{

/* ********* ROUTINE CHECKS ********************************** */

# filter too old messages if (!mf_process_maxfwd_header("10")) { log("LOG: Too many hops\n"); if (method!="ACK") { sl_send_reply("483","Alas Too Many Hops"); } break; }; # if (len_gt( max_len )) { if (msg:len > max_len) { sl_send_reply("513", "Message too large sorry"); break; };

if (method=="REGISTER") { # REGISTER IF # log("REGISTER request");

if (is_from_local()) { # IS FROM LOCAL # Mark as NAT'ed if (client_nat_test("3")) { setflag(2); force_rport(); fix_contact(); };

if (!www_authorize("", "subscriber")) { www_challenge("", "0"); break; } else if (!check_to()) { sl_send_reply("403", "Username!=To not allowed"); break; };

if (!save("location")) { sl_reply_error(); }; } else { sl_send_reply("403", "This domain is not served here"); }; # IS FROM LOCAL break; }; #REGISTER IF

if (method=="INVITE") { # INVITE IF

if (!(is_from_local() || is_uri_host_local())) { sl_send_reply("403", "Relaying is forbidden"); break; }; t_on_failure("1");

} else if (method == "BYE" || method == "CANCEL") #INFITE END BYE START { end_media_session(); }; #BYE STOP

if (loose_route()) {

if (method=="INVITE" || method=="ACK") { use_media_proxy(); }; # end media session for BYE and CANCEL is done above # before entering the loose route. no need to call it here t_relay(); break; };

# Force subsequent messages to pass trough this proxy if (method == "INVITE") { record_route(); };

if (client_nat_test("3") && !search("^Record-Route:")) { # Mark as NAT'ed force_rport(); fix_contact(); }; if (method=="INVITE") { t_on_reply("1"); };

if (is_uri_host_local()) { if (!lookup("location")) { sl_send_reply("404", "User not found"); break; }; };

if (method=="INVITE" || method=="ACK") { use_media_proxy(); };

if (!t_relay()) { if (method=="INVITE" || method=="ACK") { end_media_session(); }; sl_reply_error(); };

}

failure_route[1] { end_media_session(); }

onreply_route[1] { if (status=~"(183)|(2[0-9][0-9])") { if (client_nat_test("1")) { fix_contact(); }; use_media_proxy(); }; }

-------------------------------------------------------------------- Also i attached the log of ser files and the ngrep logs from ser box and from linux box . I run ser as "ser:ser" user and media proxy as root on the same box .. But i do not think that this might be the issue since i am able to have media through in the 2 cases. I would appreciate if some one will give me some help .. Thanks again Decebal

PS Have also the logs and ngrep but message will get too big and will be held by mail man, so if you need it please le me know. I will send them also. Thank You