I'm reviving a brief discussion that was started here previously.

The problem is that the SIP phone does not always know what is its
phone number.  In fact, we have an entire setup in which neither of
the phones know what their phone number is.  All they really need to
know is their Outbound Proxy.  The proxy has the intelligence in that
it knows to convert a telephone number to the associated sip phone.

How can you deliver caller-id in such a system?  The originator cannot 
add a 'Display Name' that will be appropriate.  The only entity that
can do that is the proxy.

Shouldn't there be a header that adds this information?

-- 
Dvir Oren               <[EMAIL PROTECTED]>
Lucid Voice Ltd.   <http://www.lucidvoice.com>
5 Jabotinski St., Ramat-Gan, 52520      Israel
Tel: 972 3 5757488          Fax: 972 3 5757499
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