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) instant messages (draft-ietf-sip-message-07.txt) event notifications (RFC 3265)

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)

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

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) or im: (CPIM-compliant instant messaging)

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 but xCal uses DTD Conclusion: Use RFC2445 format?

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

Open Issues and Future Work Does iSIP fit in 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