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

[Daniel-Constantin Mierla]

Hello,

On 20.08.2009 13:56 Uhr, Dubravko Caric wrote:
> 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;
> }
>       
>   
you should not do nat processing for messages coming from the other proxy.

Cheers,
Daniel

-- 
Daniel-Constantin Mierla
* http://www.asipto.com/