[clug] Wireshark VOIP and Caller IP address

Keith Goggin lroyjh at gmail.com
Wed Oct 28 06:32:45 UTC 2020


Thanks Stephen,

yes someone else mentioned the spammers inability to 'press the # key'.

My luck would be having bought a new phone the spammers would upgrade 
their equipment to defeat me.


On 28/10/20 5:21 pm, Stephen Hocking via linux wrote:
> 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.
>>
>> --
>> linux mailing list
>> linux at lists.samba.org
>> https://lists.samba.org/mailman/listinfo/linux
>
>


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