The solution has to be client-side. See this link:
https://www.linkedin.com/pulse/how-block-ghost-calls-coming-from-100100010000-your-yealink-nadeau

On 31 October 2016 at 17:21, Russell Treleaven <[email protected]>
wrote:

> sounds like you are getting port scanned and then dosed.
> you need ids/ips protection.
>
> Anybody got a simple solution for this?
>
>
> On Mon, Oct 31, 2016 at 12:01 PM, Stefan Monnier <[email protected]
> > wrote:
>
>> > Use of a random sip port should just about eliminate the problem.
>>
>> I already have enabled the `use random port` option.
>>
>> > You can try ticking the random ports option, but the more reliable way
>> is
>> > to edit the linphone source to restrict to a specific server domain.
>>
>> Hmm... editing the source code, installing the needed ADK and whatnot
>> for it doesn't sound too appealing to me.  And the specific server
>> domain is not always the same.  Getting a call from
>>
>>     [email protected]
>>
>> is annoying but bearable.
>> Getting 50 of them in a row is the problem I'm trying to solve.
>> So as quick "block caller" would be *really* welcome.
>>
>>
>>         Stefan
>>
>>
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>>
>
>
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