> If UAC sends a REGISTER request with "Authorization" header 
> with digest response, should the registrar acknowledge it 
> with 200 OK or 401 Unauthorized? 

I can basically respond however it deems appropriate.


> Lets assume that the UDP packet carry REGISTER-2 gets delayed 
> say more than 500ms before reaching the UAS. In such situation, 
> can the UAC resend the same REGISTER-2 request again? 

Yes.


> or does it need to start with REGISTER-1 and get challenged 
> and then send REGISTER-2?

There is no need to strip the Authorization upon sending a retry.  Some devices 
do increment nc value; however I don't recommend it.


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