[Blink] Serious VoIP problems whenever Blink is connected

Frank Helmschrott frank at helmschrott.de
Sat Feb 8 15:01:38 CET 2014


Hi,

i'm in talks with AVM about this issue and will assist the solution with
support files from the router.

Just to make one thing clear: The box does not intercept the traffic, it
acts as a voip server itself. We have local accounts and connect clients to
it. I haven't tested using the VOIP providers accounts directly on the
clients but as we want to have internal calls this isn't an option for us.
Also the box acts as answering machine and fax machine.

Frank


2014-02-08 14:50 GMT+01:00 Adrian Georgescu <ag at ag-projects.com>:

> Not related but good to know if you own those boxes.
>
> Anyway the point is the Fritz Box intercepts all SIP and RTP traffic and
> does something with it. So I am not surprised that is miss behaving when
> SIP end-points do something that FritzBox does not expect and was not
> programmed properly for handling it.
>
> Is a generic problem with any "SIP aware" intermediate equipment in the
> path that tries to 'fix things'.
>
> Regards,
> Adrian
>
>
> On 08 Feb 2014, at 10:58, Mark Huf <mail at markhuf.com> wrote:
>
>  Not sure if related but concerns Fritz Box
>
>  Mark
>
>  http://www.avm.de/en/news/artikel/2014/security_advisory.html
>
> Op 8 feb. 2014 om 10:47 heeft "Adrian Georgescu" <ag at ag-projects.com> het
> volgende geschreven:
>
>  I have no idea and cannot brainstorm what would happen on minute 9:40
> with your Fritz Box.
>
>  Blink is does not do anything special on that minute.
>
> Adrian
>
>   On Feb 8, 2014, at 10:45 AM, Frank Helmschrott <frank at helmschrott.de>
> wrote:
>
>   Well, my problem is that this only happens with Blink. I’m willing to
> try but i’m rather sure AVM will say something like „Ask this the guys that
> are doing Blink“ ;-)
>
>  Do you know these problems with AVM hardware or why are you so sure the
> problem is on their end?
>
>  Frank
>
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>
>  --
> Adrian
>
>
>
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>
>
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>


-- 
Schöne Grüße,
Frank Helmschrott

E-Mail: frank at helmschrott.de
Twitter: http://twitter.com/helmi
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