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iSIP: iTIP over SIP and Using iCalendar with SIP

iSIP: iTIP over SIP and Using iCalendar with SIP. draft-pessi-calsch-isip-00.txt Individual Submission by Pekka Pessi, Martti Mela. What is SIP?. SIP is IP telephony signaling protocol Based on HTTP, RTSP Real-time RFC 3261 Main features: setting up calls and conferences (RFC 3261)

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iSIP: iTIP over SIP and Using iCalendar with SIP

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  1. iSIP: iTIP over SIPand Using iCalendar with SIP draft-pessi-calsch-isip-00.txt Individual Submission byPekka Pessi, Martti Mela

  2. What is SIP? • SIP is IP telephony signaling protocol • Based on HTTP, RTSP • Real-time • RFC 3261 • Main features: • setting up calls and conferences (RFC 3261) • instant messages (draft-ietf-sip-message-07.txt) • event notifications (RFC 3265)

  3. What is iCalendar and iTIP? • iCalendar is calendaring information exchange format • Based on vCalendar • RFC-822-like syntax • VEVENT, VFREEBUSY, VTIMEZONE, VTODO, VJOURNAL • iTIP is an abstract protocol for interaction between calendar UAs • Methods like PUBLISH, REQUEST, REPLY, CANCEL, ADD, etc. • Currently iTIP mapping to mail (iMIP)

  4. iCalendar Usage with SIP • Off-line invitations • Invitation to future conference (vEvent etc.) • Describing SIP teleconferences • Conference roles (chairs, participants, resources like conferencing server, etc.) • Indicating schedule and timezone • Callee can indicate when he is available • Notifications for schedule, conference, etc. • Interested parties can subscribe to a resource, receive new iCalendar documents after updates

  5. iSIP: Mapping iTIP to SIP • iSIP is very similar to iMIP • Carry iTIP methods in SIP instant messages (SIP MESSAGE requests) • Allow iTIP PUBLISH methods in any SIP message • Use MIME, but no Content-Transfer-Encoding • Use SIP URLs instead of MAILTO: URLs • Because no mapping between MAILTO: and SIP: • In some cases, other URL schemes could be used: • tel: (telephone numbers) orim: (CPIM-compliant instant messaging)

  6. iSIP and xCal • Draft proposes using XML iCalendar format with SIP • XML is extensible • XML is already widely used with SIP applications • xCal could be included in other XML documents • … but now we are wiser • extensible XML format require XML schema butxCal uses DTD • Conclusion: • Use RFC2445 format?

  7. iSIP and Current CALSCH Work • No changes to RFC 2445 iCalendar format required • In future, some iSIP applications (like describing a teleconference) may add parameters to iCalendar • No changes to RFC 2446 iTIP required • No conflict with CAP

  8. Open Issues and Future Work • Does iSIP fit in CALSCH? • CALSCH working group item or individual work? • Submit new draft using standard iCalendard format? • Specify iSIP applications separately: • iCalendar for on-line conferences • iCalendar notifications

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