[Freeswitch-users] Freeswitch optimization as a registrar

[peder at networkoblivion.com]

>  This is
> because the ua sends it's registration refresh unauthenticated.  The
> registrar will then push back an authentication challenge request so the
> ua can prove its identity, at which point the ua then repeats the same
> transaction, but with authentication credentials attached.

Why does it do that?  Every time I do a debug, I see the first request 
denied as unauthorized and then it always comes right back and gets 
registered ok.  Is it part of the SIP spec to try unauthenticated first? 
    I would think you could set something on the UA to cut out the extra 
traffic.