Hi Tchan,

I have the same problem. So i used this "ser.cfg" (see below) to be sure that if UA1 can call UA2 without any problem (and the opposite). Like i don't know how to avoid the use of media proxy for private use only. Is there a way to use media proxy ONLY when one of the two UA comes from Internet ? How NatHelper / MediaProxy modules know which ip range concerns private network and public network ? With this config file, all RTP sessions used the media proxy module...

Thanks in advance, Chris.

' ------------------------- SER.CFG -------------------------

alias="test.ser" listen=172.20.255.192

check_via=no # (cmd. line: -v) dns=no # (cmd. line: -r) rev_dns=no # (cmd. line: -R) fifo="/tmp/ser_fifo"

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

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"

loadmodule "/usr/local/lib/ser/modules/mysql.so" loadmodule "/usr/local/lib/ser/modules/auth.so" loadmodule "/usr/local/lib/ser/modules/auth_db.so"

loadmodule "/usr/local/lib/ser/modules/uri.so" loadmodule "/usr/local/lib/ser/modules/uri_db.so" loadmodule "/usr/local/lib/ser/modules/domain.so" loadmodule "/usr/local/lib/ser/modules/mediaproxy.so" loadmodule "/usr/local/lib/ser/modules/nathelper.so"

# ----------------- setting module-specific parameters --------------- modparam("usrloc", "db_mode", 2)

modparam("auth_db", "calculate_ha1", 1) modparam("auth_db", "password_column", "password")

modparam("rr", "enable_full_lr", 1)

modparam("registrar", "nat_flag", 6)

modparam("nathelper", "rtpproxy_disable", 1) modparam("nathelper", "natping_interval", 0)

modparam("mediaproxy", "natping_interval", 30) modparam("mediaproxy", "mediaproxy_socket", "/var/run/mediaproxy.sock") modparam("mediaproxy", "sip_asymmetrics", "/usr/local/etc/ser/asymmetrics/sip-clients") modparam("mediaproxy", "rtp_asymmetrics", "/usr/local/etc/ser/asymmetrics/rtp-clients")

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

route { if (!mf_process_maxfwd_header("10")) { sl_send_reply("483", "Too Many Hops"); break; };

if (msg:len > max_len) { sl_send_reply("513", "Message Overflow"); break; };

if (method=="INVITE" && client_nat_test("3") ) { record_route_preset("172.20.255.192:5060;nat=yes"); } else if (method!="REGISTER") { record_route(); };

if (method=="BYE" || method=="CANCEL") { end_media_session(); };

if (loose_route()) { if (has_totag() && (method=="INVITE" || method=="ACK")) { if (client_nat_test("3") || search("^Route:.*;nat=yes")) { setflag(6); use_media_proxy();² }; };

route(1); break; };

if (uri!=myself) { route(4); route(1); break; };

if (method=="CANCEL") { route(1); break; } else if (method=="INVITE") { route(3); break; } else if (method=="REGISTER") { route(2); break; };

lookup("aliases"); if (uri!=myself) { route(4); route(1); break; };

if (!lookup("location")) { sl_send_reply("404", "User Not Found"); break; };

route(1); }

route[1] { t_on_reply("1");

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

sl_reply_error(); }; }

route[2] { sl_send_reply("100", "Trying");

if (!search("^Contact:[ ]**") && client_nat_test("7")) { setflag(6); fix_nated_register(); force_rport(); };

if (!www_authorize("","subscriber")) { www_challenge("","0"); break; };

if (!check_to()) { sl_send_reply("401", "Unauthorized"); break; };

consume_credentials();

if (!save("location")) { sl_reply_error(); }; }

route[3] { if (!proxy_authorize("","subscriber")) { proxy_challenge("","0"); break; } else if (!check_from()) { sl_send_reply("403", "Use From=ID"); break; };

consume_credentials();

if (client_nat_test("3")) { setflag(7); force_rport(); fix_nated_contact(); };

lookup("aliases"); if (uri!=myself) { route(4); route(1); break; };

if (!lookup("location")) { sl_send_reply("404", "User Not Found"); break; };

route(4); route(1); }

route[4] { if (isflagset(6) || isflagset(7)) { use_media_proxy(); }; }

onreply_route[1] { if ((isflagset(6) || isflagset(7)) && (status=~"(180)|(183)|2[0-9][0-9]")) { if (!search("^Content-Length:[ ]*0")) { use_media_proxy(); }; }; if (client_nat_test("1")) { fix_nated_contact(); }; }