I cannot easily tell from 3261 whether references to URIs other than the 
Request URI must be encased in "<" and ">" or not, probably because I do 
not know how to read BNF.

In other words, in the absence of a display name (which would be a 
quoted string), is this valid?

    Contact: sip:xx.xxx.xx.xxx:5060

What about this?

    To: sip:xx.xxx.xxx.xxx:5060

I was under the impression it was not, but this is mainly because I've 
never seen any implementation NOT use that notation regardless of 
whether it is necessary.  I do not know if the rules here are more or 
less strict than RFC 2822.

Thanks!

-- 
Alex Balashov - Principal
Evariste Systems
Web     : http://www.evaristesys.com/
Tel     : (+1) (678) 954-0670
Direct  : (+1) (678) 954-0671
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