Presence and IntComm WG

[Jamey Hicks <>]

This internet-draft:

User Agent Capability Extension to Presence Information Data Format
                                (PIDF)
                  
http://www.ietf.org/internet-drafts/draft-ietf-simple-prescaps-ext-01.txt

describes an extension to the pidf format to include various 
capabilities of the user agent in presence notifications.  Given the 
goals for the fall member meeting, I think it is worth adding it to the 
client requirements document.  For backwards compatibility, UA's not 
supporting the <prescaps> element will assume to support both audio and 
text messaging unless the presence agent can figure it out from the name 
of the user agent.

Here is an example pidf with prescaps for a UA supporting audio, video 
but not text:
  <?xml version="1.0" encoding="UTF-8"?>
  <presence xmlns="urn:ietf:params:xml:ns:pidf"
    xmlns:ext="urn:ietf:params:xml:ns:simple-prescaps-ext
    
entity="pres:">
     <tuple id="joi9877866786ua9">
       <status>
         <basic>open</basic>
         <ext:prescaps>
         <ext:video>true</ext:video>
         <ext:audio>true</ext:video>
         <ext:text>false</ext:text>
         <ext:mobile>true</ext:mobile>
      </ext:prescaps>
    </status>
    
<contact>sip:</contact>
   </tuple>
  </presence>

Xiaotao: do you think you can add support for this to sipc?  I don't 
think it will be a problem to add to the presence agent.

Jamey