[OpenSIPS-Users] I need to understand when from opensips ser "TCP Zero Window" message get generated .

[Sasmita Panda]

On the same server I can see something different as well .

I have only configured 5060 ports for TCP and UDP in the listen parameter .
But I can see openisps established connections from different ports rather
than 5060 . How is that possible ?

tcp        0      0 172.x.y.z:5060        10.m.n.o:42560     ESTABLISHED
24449/opensips
tcp        0      0 172.x.y.z:5060        10.a.b.c:35507     ESTABLISHED
24448/opensips
tcp        0      0 172.x.y.z:58609       10.m.n.o:5060      ESTABLISHED
24450/opensips
tcp        0      0 172.x.y.z:57323       10.a.b.c:5060      ESTABLISHED
24449/opensips

Here 172.x.y.z is my opensips server and others are gateway IPs . I can
understand the TCP connection from the 5060 port .
How do opensips select other ports here ?
Is this the default behaviour of opensips ? Or in the latest version the
behaviour changes ?






*Thanks & Regards*
*Sasmita Panda*
*Senior Network Testing and Software Engineer*
*3CLogic , ph:07827611765*


On Thu, Feb 13, 2025 at 10:44 AM Sasmita Panda <spanda at 3clogic.com> wrote:

> Hi ,
>
>
> I have a server running on opensips 2.2 version (Yes that is very old I
> know , we are planning to upgrade that in near future ) .
>
> On that server I have set up the gateways with TCP socket connection .
> Openisps while sending outbound calls to the gateway give the call in TCP .
>
> From the last 2/3 months we observed , randomly sometime in 7days or 10/12
> days the connection won't get established and calls get affected .
>
> Once we restart the opensips service things start working fine .  So here
> is opensips blocking something ? or is it on my linux machine blocking the
> connection ?
>
> For the proto_tcp module I have not configured any parameters . just
> loaded the module . I am hoping the default values must be in use .
>
> Can anybody suggest to me what I need to debug here ?
>
> *Thanks & Regards*
> *Sasmita Panda*
> *Senior Network Testing and Software Engineer*
> *3CLogic , ph:07827611765*
>
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