[VOIPSEC] DKIM Domain Key Identified Mail

[Christopher A. Martin]

Maybe an announcement that user identification is pending. People put up 
with delays from Cell phones, and there is something similar when delays 
are occuring...

"Please wait while we locate the xxxxx service subscriber...."


Randell Jesup wrote:

>Simon Horne <s.horne at isvo.net> writes:
>[ re: sip-identity ]
>  
>
>>Ideally. This it what we're trying to port to SIP, the UA's act as their 
>>own authentication service.:(
>>
>>Also I noticed that it may take 6 messages to authenticate both parties and 
>>then on top of that you may have to download 2 certificates. If parties are 
>>a distance apart (say 150ms delay) then it maybe in excess of 1.5 sec just 
>>to authenticate each other, is that acceptable?
>>    
>>
>
>        1.5 seconds is significant, especially if it has to occur after
>signalling the user.  If it's pre-ring, it's still problematic when added
>on top of other existing delays, though perhaps not too large to be 
>practical.  Part of the problem is that people are used to short delays
>before ring, especially when wired (not on a cellphone).  Let's say that
>there's a 1.5 second delay for call setup now (which BTW is probably 
>over-generous). Adding 1.5 seconds to that is quite noticable and would be
>getting into the annoying level for many people.
>
>        I should note that 150ms is nowadays a fair distance apart for
>broadband users (especially if you're talking one-way, which I think you
>are).  We can typically go east-coast US to Taiwan in that time (actually
>noticably less).
>
>  
>