App%20Interaction%20Framework

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App Interaction Framework

• Jonathan Rosenberg
• dynamicsoft

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Main Issue How to Deliver DTMF

• Current draft makes a new proposal
• Two separate UI types are recognized
• Presentation Capable
• HTML, WML, VoiceXML
• Presentation Free
• KPML

• Presentation Capable
• Application sends REFER to UA
• Refer-To has HTTP URI
• URI references the markup
• Presentation Free
• Application sends a SUBSCRIBE to UA
• Subscribe body has KPML
• NOTIFY contains DTMF

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Example KPML Flow
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Example HTML Flow
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Implications

• App-Info Header Not Used
• No ability to push updated scripts for
  presentation capable case
• GRUU is needed in both cases
• Needs to be unique for each dialog
• Applications authorize any REFER/SUB made to GRUU
• Applications can establish app sessions at any
  time

• Application authentication to client done using
  normal SIP means
• App sessions terminate with dialog
• For presentation-free, can terminate earlier
• Solves the forking problem
• Much simpler overall

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Next Steps

• Consensus on this approach?
• If so, one more rev and we should be done
• KPML needs a rev for alignment as well