A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : The Five Meanings of the REFER Method
Author(s) : D. Worley
Filename : draft-worley-sip-many-refers-00.txt
Pages : 10
Date : 2006-6-21
The REFER method is defined in RFC 3515. That RFC defines the syntax
of the REFER request and some of the machinery involved in its
execution, but it defines the semantics of the method only so far as
to specify that the recipient will initiate a request to the target
specified in the Refer-To header. But since almost all requests that
can be sent by the recipient are inherently part of an encompassing
UA action that affects the state of the recipient in ways that are
not directly reflected in SIP protocol actions, the standardized
action of initiating a request implicitly has further consequences
which are often not clearly specified. As a result, various SIP
call-control proposals assume that a UA receiving a REFER will
perform the UA operation that is needed at that moment without
specifying clearly how the UA recognizes which UA operation is
needed. As a result there are now five semantically distinct defined
uses of REFER. All five uses bear a family resemblance, and each
involves sending a SIP request, but the exact meaning of each use is
logically independent of the others, and the rules by which a UA
distinguishes the five cases are at best implicit.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-worley-sip-many-refers-00.txt
To remove yourself from the I-D Announcement list, send a message to
i-d-announce-request@ietf.org with the word unsubscribe in the body of the message.
You can also visit https://www1.ietf.org/mailman/listinfo/I-D-announce
to change your subscription settings.
Internet-Drafts are also available by anonymous FTP. Login with the username
"anonymous" and a password of your e-mail address. After logging in,
type "cd internet-drafts" and then
"get draft-worley-sip-many-refers-00.txt".
A list of Internet-Drafts directories can be found in
http://www.ietf.org/shadow.html
or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
Internet-Drafts can also be obtained by e-mail.
Send a message to:
mailserv@ietf.org.
In the body type:
"FILE /internet-drafts/draft-worley-sip-many-refers-00.txt".
NOTE: The mail server at ietf.org can return the document in
MIME-encoded form by using the "mpack" utility. To use this
feature, insert the command "ENCODING mime" before the "FILE"
command. To decode the response(s), you will need "munpack" or
a MIME-compliant mail reader. Different MIME-compliant mail readers
exhibit different behavior, especially when dealing with
"multipart" MIME messages (i.e. documents which have been split
up into multiple messages), so check your local documentation on
how to manipulate these messages.
Below is the data which will enable a MIME compliant mail reader
implementation to automatically retrieve the ASCII version of the
Internet-Draft.
- <ftp://ftp.ietf.org/internet-drafts/draft-worley-sip-many-refers-00.txt>
-
_______________________________________________
I-D-Announce@ietf.org
https://www1.ietf.org/mailman/listinfo/i-d-announce
