[Kamailio-Users] Problem with BYE when using TCP or TLS between two Kamilio proxies

[Dubravko Caric]

Hi Daniel,



----- Original Message ----
From: Daniel-Constantin Mierla <miconda at gmail.com>
To: Dubravko Caric <dubravko_caric at yahoo.com>
Cc: kamailio users <users at lists.kamailio.org>
Sent: Thursday, August 20, 2009 12:49:41 PM
Subject: Re: [Kamailio-Users] Problem with BYE when using TCP or TLS between two Kamilio proxies

Hello,

On 20.08.2009 13:31 Uhr, Dubravko Caric wrote:
> Hi all,
>  I have a problem with
> routing BYE messages (when called UAC sends BYE) when connection between two
> Kamailio (1.5.1 with identical configurations) proxies is done by TLS/TCP.
>  WORKING:
> UAC#1  <-- UDP/TCP/TLS -->  Proxy#1  <--UDP--> Proxy#2   <-- UDP/TCP/TLS -->  UAC#2
>  NOT WORKING:
> UAC#1  <-- UDP/TCP/TLS -->  Proxy#1  <-- TCP or TLS --> Proxy#2   <-- UDP/TCP/TLS -->  UAC#2
>  By looking at ngrep
> log I found out that when “UAC#1” sends INVITE, “Proxy#1” sends right “Contact”
> header (Contact:<sip:bob at IP_ADDRESS_OF_UAC#1:6126;transport=udp>)
> to “Proxy#2” , but “Proxy#2” sends wrong “Contact” header (Contact:<sip:bob at IP_ADDRESS_OF_PROXY#1:39879;transport=udp>)
> to “UAC#2”.
>  When UAC#2 sends BYE,
> it is sends message with this wrong header and when it arrives on “Proxy#1” proxy
> doesn’t sends BYE message to UAC#1. Or when UACs with TCP, this are “Proxy#1”
> errors:
>  DBG:core:tcp_send: no
> open tcp connection found, opening new one ERROR:core:tcp_blocking_connect:
> poll error: flags 18 ERROR:core:tcp_blocking_connect:
> failed to retrieve SO_ERROR (111) Connection refused ERROR:core:tcpconn_connect:
> tcp_blocking_connect failed ERROR:core:tcp_send:
> connect failed ERROR:tm:msg_send:
> tcp_send failed ERROR:tm:t_forward_nonack:
> sending request failed DBG:tm:t_relay_to:
> t_forward_nonack returned error
>  What bothers me is
> that when I call the other UAC, he can hangup the call (even when he is CALLED UAC),
> then I restart both proxies and it is other way around.
>  I do not know if I
> described problem clearly but I am lost in where to look next so any help would
> be appreciated. Why proxy change Contact header when I switch from UDP to TCP
> between proxies? I'm not rewriting Contact header and only thing that I change in configuration when switching from UDP to TCP is this:
>  if($rd=="example.com")
> {
>                 t_relay("tcp: example.com:5063");
>               exit;
> }
>    
do you have NAT travesal logic in config file and use fix_natted_contact()?

yes, I have. both UACs have public IP addresses.

# Caller NAT detection route
route[4] {

        xlog("L_INFO","Route 4\n");

        force_rport();

        force_tcp_alias();

        if (nat_uac_test("19")) {

                if (method=="REGISTER") {

                        xlog("L_INFO","REGISTER Route 4\n");
                        fix_nated_register();

                } else {

                        xlog("L_INFO","NOT REGISTER Route 4\n");
                        fix_nated_contact();
                }
                setflag(5);
        }

        return;
}


/dubravko