As an end user what is easier to call an enum or foo at example.com ?

[Boris Shtrasman]

Howdy , 

I'm working on a SIP router (broker - opensips) to allow user at bar.com call 
to example.com without any special configurations (while the PBX owner will set 
it).

As an end user what would you prefer to do ?  (number or user at domain)
With enum you call for example
1234-567890
1234 - example.com
567890 - user phone number 

P.s
I didn't find how to work with OpenID with SIP yet ... 
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