[clug] Wireshark VOIP and Caller IP address

[Stephen Hocking]

I fixed the problem by buying a Telstra Call Guardian phone. It does
whitelisting & blacklisting, and if it doesn't recognise a number, it
asks the person to say their name and then press the '#' key. The
scammers don't have a phone number pad in front of them, only a
computer to take care of your details. This means they can't press the
'#' key that will send the appropriate signal down the phone line. I
haven't had the phone ring with a scammer since I got it.

On Wed, 28 Oct 2020 at 16:39, Bob Edwards via linux
<linux at lists.samba.org> wrote:
>
> On 28/10/20 4:00 pm, Keith Goggin via linux wrote:
> > Due to increased occurrence of Unsolicited VOIP calls I've been
> > motivated to try to track the callers IP address and block them.
> >
> > I have a Gigaset VOIP Phone connected to a Mikrotik router connected to
> > a 4G modem/router.
> >
> >   Using the Mikrotik Packet Sniffer tool I can collect call data and
> > pass it to Wireshark for examination.
> >
> > I was expecting calls to be set up (dialed) via my VOIP provider, but
> > once established (answered) on going traffic would be directly between
> > the caller ip and the receiver ip addresses.
> >
> > This doesn't seem to be the case as I collected call data from a friend
> > and the UDP packets source address was that of my providers server not
> > the callers address.
> >
> > In principle this should be straight forward even for dummies like, me
> > alas not so.
> >
> > Can anyone offer a good reference text for beginners.
> >
> > Thanks
> >
> >
> >
>
> Hi Keith,
>
> I guess there is no one "VOIP" protocol - some are point-to-point (as
> you expected) but others are via various gateways and service-provider
> servers. Even protocols that could be point-to-point can still be
> routed via a gateway.
>
> Can you tell us which VOIP protocol you are using?
>
> Wikipedia (and the "external links" at the bottom of almost all
> articles) is my reference book for most things...
>
> cheers,
> Bob Edwards.
>
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