[Blink] Blink only responding to some incoming calls

Adrian Georgescu ag at ag-projects.com
Wed Jun 23 20:45:43 CEST 2010


One way to get rid of these broken ALG is to not use UDP anymore and  
switch to TLS transport. But the SIP servers are not really ready for  
this challenge today.


On Jun 23, 2010, at 11:44 AM, Andreas Sikkema wrote:

>>> I call on my cell phone to check if the number is working and  
>>> Blink is
>>> running and says available but more often then not it does not show
> that
>>> a call is coming in.
>>> I have not changed any of the default settings. Seems like there  
>>> must
> be
>>> one setting that is not right as sometimes the calls come in fine  
>>> and
> we
>>> can make calls out.
>> Can you enable the SIP logging in the log window and paste what you  
>> see
>> when this happens? I haven't experienced this so I'd need some more
>> information in order to know what and why it's failing.
> Are all Blink instances registered to the same server?
> If yes, are all Blink instances behind a NAT?
> If yes, are all Blink instances behind the same NAT?
> if yes, are all Blink instances using the same port (5060) as the  
> source
> port for their outgoing SIP traffic?
> Most NAT implementations have lots of problems coping with the above
> situation, configure all Blink instances to use a different source  
> port
> and I think all instances will start reliably receiving calls. I  
> know it
> is counterintuitive and stupid and unneccesary and possibly the  
> result of
> weird or buggy NAT implementations, but this is from very painful
> experience...
> In the above situation the Blink instance that has last tried to  
> renew its
> registration will receive all call attempts and only accept those  
> that are
> meant for itself.
> BTW, this is not a Blink problem. ALL SIP clients behind the same  
> NAT will
> probably experience this issue. Apart from the first client at the
> location all other SIP clients will need to be reconfigured.
> -- 
> Andreas Sikkema
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