[clug] Wireshark VOIP and Caller IP address

[David C]

There is a bunch of ways of making this go away using Asterisk. It's
possible the spam calls are preferable to making Asterisk work the way you
think it should.

On Wed, 28 Oct 2020, 7:01 pm Kim Holburn via linux, <linux at lists.samba.org>
wrote:

> There are several probems with VOIP/SIP.  One is that most VOIP/SIP
> protocols pass the IP numbers in the data part of the packets.
> Two is there are sometimes several streams most often of UDP packets.  It
> is a really exasperating protocol suite.  It is quite hard
> to work this out with wireshark.  Three is that if both parties are behind
> a NAT firewall, they can't talk directly anyway.
>
> The only real way is to use a VOIP session border controller which is
> expensive.  Barring that you could set up a small asterisk
> server which could do it but is expensive in time and patience to set up.
>
> How much is the Telstra device?
>
> I have this problem with my VOIP "landline".  I generally pick the phone
> up and listen.  If its spam they generally hang up.  I am
> at the point of giving up the landline altogether.
>
> On 2020/10/28 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
> >
> >
> >
>
> --
> Kim Holburn
> IT Network & Security Consultant
> T: +61 2 61402408  M: +61 404072753
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>
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