Subject: [SIP] Discussion On 485

From: james jack <[email-masked]>
Date: Wed, 15 Nov 2000 20:49:59 -0800 (PST)

Dear All:
  I have one question to discuss, on RFC2543bis02 page
68, which says"The callee address provided in the
request was ambiguous. The response MAY contain a
listing of possible unambiguous addresses in Contact
headers.
   Revealing alternatives can infringe on privacy
concerns of the user or the organization. It MUST be
possible to configure a server to respond with status
404 (Not Found) or to suppress the listing of possible
choices if the request address was ambiguous."
  I can't understand how the UAS or server can judge
this address is ambiguous,if there is no such callee
after comparison, 404 response code can be sent out.
How can the server know under what situation 485 will 
be sent out.
   Could anyone give me some suggestion?
   Thanks in advance!
   Best regards!
                      Yours: Ford

If the server receives a request whose To address or
request-uri is ambiguous then the server may respond
with a 485 response.  The response usually contains a
list of un-ambiguous addresses that are semantically
similar to the ambiguous address.  However this
listing should be suppressed or displayed based on the
request address.  The pattern by which we can find if
an address is ambiguous or not available is not clear
to me.  Based on this method only we can either send a
485 or 404 response.

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