[OpenSIPS-Users] OpenSIPS reopen TCP connectios and sends INVITE, but not BYE. How to change it?

[Federico Edorna]

Hi Răzvan,

related to this topic, it seems that tcp_no_new_conn_bflag is not working
on "on_reply" routes

I've tried changing modules/tm/t_reply.c (opensips 2.2), using something
like this:


if (tcp_no_new_conn_bflag)
                tcp_no_new_conn = 1;


in "relay_reply" function and now opensips doesn't try to open a new tcp
connection. Without this code I cannot manage to avoid the TCP SYN from
opensips to client when receiving a reply and tcp connection is not
available.


Just to clarify, the scenario is something like this:


A opensips B

--- INVITE --->

--- INVITE --->
<--- 100 Trying ---
<--- 100 Trying ---

<--- 183 Session Progress---


<--- 183 Session Progress---


--- At this point I wait opensips to close tcp connection
(tcp_connection_lifetime=10) and then "B" answers the call ----


<--- 200 OK ---


Thanks!

Federico

On Thu, Oct 27, 2016 at 4:58 AM, Răzvan Crainea <razvan at opensips.org> wrote:

> Hi, Rodrigo!
>
> Having OpenSIPS opening TCP connections towards client is a bit dangerous,
> especially if the clients are behind NAT. That's because most likely you
> will not be able to reach them, and opensips will get stuck trying to
> connect (until it triggers a timeout). That's why the best way to go is to
> try to keep the connection (ideally opened by the client at REGISTER) as
> much as possible. This is usually done by pinging (as discussed in a
> previous email). So my suggestion is to try to avoid opening new TCP
> connections with clients, unless you really know they will always be
> reachable.
>
> The behavior you are describing (INVITE vs BYE handling), might be related
> to the fact that you are setting the tcp_no_new_conn_bflag[1] flag for BYE
> messages, but not for INVITEs. Is this correct? If not, do you see any
> errors in the script?
>
> [1] http://www.opensips.org/Documentation/Script-CoreParameters-2-2#toc101
>
> Răzvan Crainea
> OpenSIPS Solutionswww.opensips-solutions.com
>
> On 10/26/2016 10:59 PM, Rodrigo Pimenta Carvalho wrote:
>
> Hi.
>
>
> After some log debug I have observed the following behavior in the
> OpenSISP (2.2.1):
>
>
> When OpenSIPS has to send a SIP INVITE to a peer through a TCP connection
> that was closed before by some way, OpenSIPS open a new one and then sends
> the SIP message to the peer successfully.
>
>
> However, when OpenSIPS has to send a SIP BYE to a peer through a TCP
> connection that was closed before, OpenSIPS open a new one, but doesn't
> send the SIP BYE. In this case SIP BYE is discarded.
>
>
> How to change the behavior of OpenSIPS to make it to send the SIP BYE is
> such case?
>
>
> I'm looking for ways of fix or workaround of a TCP tear down connection
> that happens during dialogs.
>
>
> Any hint will be very helpful!
>
>
> RODRIGO PIMENTA CARVALHO
> Inatel Competence Center
> Software
> Ph: +55 35 3471 9200 RAMAL 979
>
>
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