Hi,

     Suppose UA is behind NAT.  At registration time, can UA add the  
Option tag "outbound" in the
Require header of REGISTER request, since it does not want to continue 
otherwise?
Similarly, shall it add the option tag "path" in Proxy-Require of the 
REGISTER?

   As per RFC3261, if the UA requires the support of any option tag 
compulsorily, then it adds
those tags in Require/Proxy-Require header.
But, this behavior is not mentioned explicitly, in RFC5626.

Please clarify.

Thanks in adv.

Regards,
Prashanth. M E

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