[Users] MediaProxy & PSTN

[Ozan Blotter]

Dear List,

At below config. i setted up OpenSER on Public IP and PSTN Gateway is again 
on another Public IP. I use Zyxel Prestige Series 660-HW ADSL modems on both 
client side and note that they have SIP ALG, also i've completed port 
forwarding in each modem, so SIP2SIP call happens (voice traffic goes from 
UA to UA) without need of anything extra as STUN or RTP RELAY. But since 
those are very away from each other if a UA needs to call PSTN the voice 
traffic flows from UA to PSTN and that lowers QoS :(

I would like to activate MediaProxy again but just for one case which is 
PSTN, so whenever a UA needs to call PSTN the voice traffic flows like :

UA (ATA) >>> OpenSER + MediaProxy >>> PSTN

How can i setup this like above without touching SIP2SIP calls between 
UA's...
or adding the lines beginning with # these to my existing config is enough ?

Thanks,
Ozan Blotter

debug=3
fork=yes
log_stderror=no
check_via=no
listen=212.XXX.104.XXX        # This is OpenSER's Public IP
port=5060
children=4
dns=no
rev_dns=no
fifo="/tmp/openser_fifo"

#    fifo_db_url="mysql://openser:openserrw@localhost/openser"


loadmodule "/usr/local/lib/openser/modules/sl.so"
loadmodule "/usr/local/lib/openser/modules/tm.so"
loadmodule "/usr/local/lib/openser/modules/rr.so"
loadmodule "/usr/local/lib/openser/modules/maxfwd.so"
loadmodule "/usr/local/lib/openser/modules/usrloc.so"
loadmodule "/usr/local/lib/openser/modules/registrar.so"
#    loadmodule "/usr/local/lib/openser/modules/mediaproxy.so"


modparam("usrloc", "db_mode",   0)
modparam("rr", "enable_full_lr", 1)
#    modparam("mediaproxy","mediaproxy_socket", "/var/run/mediaproxy.sock")
# 
modparam("mediaproxy","sip_asymmetrics","/usr/local/etc/openser/sip-asymmetric-clients")
# 
modparam("mediaproxy","rtp_asymmetrics","/usr/local/etc/openser/rtp-asymmetric-clients")

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!="REGISTER") {
  record_route();
 };

 if (loose_route()) {
  route(1);
  break;
 };

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

 if (uri==myself) {

  if (method=="REGISTER") {
   route(2);
   break;
  };

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

  if (uri=~"^sip:0[0-9]*@*") {
      rewritehost("195.XXX.122.XXX");        # This is PSTN Gateways's 
Public IP
#    use_media_proxy();
      route(1);
    break;
  };

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

  route(1);
 };
}

route[1] {
 if (!t_relay()) {
     sl_reply_error();
 };
}

route[2] {
 if (!save("location")) {
  sl_reply_error();
 };
}