[Serusers] nathelper question - sr-users

1 Dec 2003


      Hi all,
   The problem is I can't register two SIP UAs to SER
server.
This is my environment:
    Internet
       |
     router (X.X.X.163)
       |
       |Fiber   |---- Ser server    (X.X.X.166)
       |        |
    Switch------|---- Trunk Gateway (X.X.X.167)
                |
                |---- Other servers 
                |
                |---- Router( cisco 26xx) (X.X.X.163)
                        |
                     Switch
                            |
       _____________________|_________________
    Users SIP UA1(172.16.2.11) SIP UA2(172.16.2.23)
My ser.cfg like:
route{
        if ( msg:len > max_len ) {
sl_send_reply("513", "Message too
big");
                break;
        };
        record_route();
        if (loose_route()) {
                t_relay();
                break;
        };
if (!method=="BYE") {
    	force_rport();
    	fix_nated_contact();
    };
    
        if (method=="REGISTER") {
              if (!www_authorize("novsky.com",
"subscriber")) {
                      www_challenge("novsky.com",
"1");
                      break;
                      };
                  save("location");
                  break;
        };
if (method=="INVITE") {
if(!proxy_authorize("novsky.com","subscriber")) {
proxy_challenge("novsky.com","1");
                          break;
                  };
         };
if(uri=~"^sip:6169[0-9]*@[0-9|.]*")    {
                  if(!lookup("location")) {
                          sl_send_reply("404", "Not
Found");
                          break;
                  };
         }else {
                 forward(172.16.255.2,6050);
                break;
         };
        if (!t_relay()) {
                sl_reply_error();
        };
}   
I use ethereal to look the packet, first UA1 send
REGISTER to SER server, on NAT it use 5060 port, and
SER return to corrent address/port.
When UA2 send REGISTER to SER server, on NAT it use
1027 port, but SER return to NAT:5060 port and the
packet transfered to UA1.
So UA2 can't register.
I can see the NAT table on route, like
udp x.x.x.165:5060 172.16.2.11:5060 x.x.x.165:5060
x.x.x.x.165:5060
udp x.x.x.165:5060 172.16.2.23:5060 x.x.x.165:1025
x.x.x.x.165:1025
Wangji
12/1/03
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