----- Original Message ----- 
From: "Monica Ingudam" <[EMAIL PROTECTED]>


> Hi Peter,
> 
> So, should a 200 response of REGISTER with Expires header
> field present but expires parameter not present in the
> Contact header field be treated as an invalid response ?

You should sucessfully accept and process such a message
with no error. This used to be legal. 

In general, unnecessary pickiness merely harms
interoperability.

That said, you should never *send* such a message.

/a

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