From: [EMAIL PROTECTED]

   Section 4.1.6.3 of RFC4235 says if the "include-session-description" 
   element is present in the incoming subscribe,
   the Notifier should indicate the MIME media type of the session 
   description using a SINGLE attribute "type" in the xml.

The Mime type of the session *description* is application/sdp.

   Also, should the Notifier be sending "dialog-elements" for an UnSubscribe 
   request? How will
   this information (if sent) be useful at the subscriber end?

What is "dialog-elements"?  I do not see that phrase in RFC 4235.

If you mean "dialog" elements, as in:

     <dialog id="123456">
        <state>confirmed</state>
        <duration>274</duration>
        <local>
          <identity display="Alice">sip:[EMAIL PROTECTED]</identity>
          <target uri="sip:[EMAIL PROTECTED]">
            <param pname="isfocus" pval="true"/>
            <param pname="class" pval="personal"/>
          </target>
        </local>
        <remote>
          <identity display="Bob">sip:[EMAIL PROTECTED]</identity>
          <target uri="sip:[EMAIL PROTECTED]"/>
        </remote>
     </dialog>

Maybe it's useful to the subscriber and maybe not.  But the rule is
that when a subscription is altered in any way by the subscriber, the
notifier sends a full notice to the subscriber.

Dale
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