[Serusers] BYE, nat, Xlite

[Giovanni Balasso]

Hi serusers!

After setting up an almost working ser with nat, rtpproxy and asterisk ivr, 
I'm stuck on an hangup problem call if from behind nat. I can't get xlite 
BYEs to hit ser (ngrep on ser machine gets nothing on hangup pressed on 
client). The address in SEND>> is ser nat internal address and I'm calling 
from another nat. This is xlite log on BYE


SEND TIME: 735130
SEND >> 192.168.1.100:5060
BYE sip:asterisk at 192.168.1.100:5061 SIP/2.0
Via: SIP/2.0/UDP 
192.168.1.5:5060;rport;branch=z9hG4bKE406E7BA9C6E11D98395000272430644
From: gio <sip:gio at SER_PUBLIC_IP>;tag=1837372280
To: <sip:gio at SER_PUBLIC_IP>;tag=as0d4fbf68
Contact: <sip:gio at 192.168.1.5:5060>
Route: <sip:192.168.1.100;ftag=1837372280;lr=on>
Call-ID: D6C66B0C-9C6E-11D9-8395-000272430644 at 192.168.1.5
CSeq: 8745 BYE
Max-Forwards: 70
User-Agent: X-Lite release 1103m
Content-Length: 0

where 192.168.1.100 is private ip address of ser and asterisk server and 
192.168.1.5 is xlite private address from another private network.
I'm pretty sure the problem is SEND >> 192.168.1.100 shoul be SEND >> 
SER_PUBLIC_IP.

Reading past issues I tried fiddling with fix_rport, fix_nated_contact, but no 
way. Can anyone please explain the correct way to route BYEs thru NAT?
Other things work: i can hear sounds, talk to other people and record messages 
in asterisk boxes.

Please, advice
Thanx everyone





In my ser.cfg commands involved in BYE and nat are the following:

if (nat_uac_test("1")) {
   if (method == "REGISTER" || !search("^Record-Route:")) {
      fix_nated_contact();
      if (method == "INVITE" || method == "BYE" || method == "CANCEL") {
         # I think I could remove method == BYE and CANCEL with no harm...
         fix_nated_sdp("1");
      };
      force_rport();
      setflag(6);
   };
};  

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

if (method=="INVITE") {
   if (lookup("location"))  {
      setflag(1);
      route(1); 
      break;
   };
};


route[1] {

    if (isflagset(6)){
	force_rtp_proxy();
	t_on_reply("1");
    };

    if (method == "BYE" || method == "CANCEL"){
       setflag(1);
    };

    if (!t_relay()){
        sl_reply_error();
    };
    break;
}


ciao
-- 
Giovanni Balasso
giaso at yahoo.it