Am 24.06.2020 05:05, schrieb Michael Maier:

Hi

Your basic architecture looks good to me - now you have to start the

Nice to hear it...

analysis of the problem with pcapsipdump and wireshark as I wrote
before to get an idea what actually happens at
all. You most probably won't come any further without doing any
analyzing. You have to learn it. It will take some, or even more,
time. You can't do it in just few hours or maybe
even days or weeks. It is work or even hard work to learn and to do it.

Well, that's the very problem...
I don't know *how* to analyze it... Or, better, how to read the data...
I know, I can use tcpdump, sngrep and many other tools, but I don't know what I have to expect and how to decide, that a paket is wrong...
Can someone help me to learn it?

That's my problem: It's impossible for me to assist because I can't
see any effort on your side to learn. I won't fix your problem. You
have to fix it yourself. All I can do, is, to
show you a way to *find* your problem (I can't know your problem) and
may be to give some hints how to fix it (once you've found it).
Finding / localizing problems and fixing them
are two completely different things. But before you fix a problem, you
have to know the problem. Therefore: go and find your problem by
starting the analysis. That's the first thing
to do.

Of course, the first thing to do is to locate the problem...

I think, the problem can *not* be:

1) by Deutsche Telekom (since I have the problem even on local tests)
2) on the devices (since I tested many devices)

so the problem can be:

1) in the Firewall configuration
2) in the Asterisk configuration
3) in the BananaPI

I think I can exclude my switch, since I checked right now and no port has errors...

Now the question: can someone help me to understand/learn how to check the involved parts and search for the problem?

Thanks
Luca Bertoncello
(lucab...@lucabert.de)

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