Authenticated subscription request

[email protected] (John D. Ramsdell)
Newsgroups gmane.ietf.impp
Message-ID <[email protected]>
From the cpim-msgfmt document, it is obvious how to post an
authenticated message request.  The document includes this case as an
example.  For presence, it is obvious how to send an authenticated
notification because presence information can be sent using the
cpim-msgfmt, and the presence format is defined in cpim-pidf.

How does one send an authenticated subscription request?  I studied
the following documents, but was unable to find the answer to my
question.

draft-ietf-impp-cpim-02.txt	    draft-ietf-impp-cpim-pidf-02.txt
draft-ietf-impp-cpim-msgfmt-06.txt  draft-ietf-impp-datetime-05.txt

Since many users will want to control the access of presence
information, it is essential that a mechanism be provided that allows
a user to authenticate the source of a subscription request.

John


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