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Emergency Text Messaging using SIP MESSAGE draft-kim-ecrit-text-00

Emergency Text Messaging using SIP MESSAGE draft-kim-ecrit-text-00. Jong Yul Kim Wonsang Song Henning Schulzrinne Pietr Boni Michael Armstrong. IPR disclosure: https://datatracker.ietf.org/ipr/1253/. Introduction. How to use page-mode messaging for emergency?

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Emergency Text Messaging using SIP MESSAGE draft-kim-ecrit-text-00

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  1. IETF 77 Emergency Text Messaging using SIP MESSAGEdraft-kim-ecrit-text-00 Jong Yul Kim Wonsang Song Henning Schulzrinne Pietr Boni Michael Armstrong IPR disclosure: https://datatracker.ietf.org/ipr/1253/

  2. IETF 77 Introduction • How to use page-mode messaging for emergency? • Using SIP MESSAGE for session-less IM and SMS • For the endpoints that do not support session-based text (e.g., Real-time text, MSRP) • Draft contains: • Overview of operation • UAC behavior • Proxy behavior • Conversion to SIP MESSAGE

  3. IETF 77 Emergency ServicesIP Network (ESInet) IP PSAP A Location-to-Service Translation (LoST) Server PSAP SIP Proxy … Emergency Services Routing Proxy (ESRP) Call Takers ACD . . . IP PSAP Z PSAP SIP Proxy … Call Takers Conference Server ACD Overview of operation • Create soft state for each IM caller • Static routing after the first LoST query • Create soft state for each text caller • Static routing after the first LoST query IM Network IM Client SIP Proxy Resolve ESRP LoST Server SMS Network - Create record for each text caller - Static routing after first call taker assignment Cellular phone SMS-SIP Gateway • Create soft state for each SMS caller • Static routing after the first LoST query

  4. MESSAGE urn:service:sos SIP/2.0 To: urn:service:sos From: caller@sms.com Route: esrp@ng911.net Geolocation: cid:caller@sms.com; inserted-by=”caller@sms.com” Content-Type: multipart-mixed; boundary=”--- =_RjhENkI3RjQ” ----- =_RjhENkI3RjQ MIME-Version: 1.0 Content-ID: caller@sms.com Content-Type: text/plain Content-Transfer-Encoding: 8bit Hello, I need help. ----- =_RjhENkI3RjQ MIME-Version: 1.0 Content-ID: caller@sms.com Content-Type: application/pidf+xml Content-Transfer-Encoding: UTF-8 <PIFO-LO omitted> ----- =_RjhENkI3RjQ IETF 77 UAC behavior • Basically, follows rules from both: • SIP MESSAGE (RFC 3428) • Framework for Emergency Calling using Internet Multimedia (draft-ietf-ecrit-framework-10) • Also, sends MESSAGE consistently to the same ESRP or the same outbound proxy during conversation. • Next hop is fixed after first MESSAGE is sent.

  5. IETF 77 Proxy behavior • Stores a record to track MESSAGE requests. (Source SIP URI, next hop, expiration timer) • Routes all subsequent MESSAGE requests from the same source to the same next hop. • Resets expiration timer when receiving subsequent MESSAGE. • Deletes record if timer expires. • Above only applies to proxies that route MESSSAGE based on policy or location. (e.g. ESRP) From header field of MESSAGE Record valid time in seconds Either ESRP or PSAP URL from first LoST query

  6. IETF 77 Conversion to SIP MESSAGE • SMS-SIP/IM-SIP gateway converts SMS/IM messages to SIP MESSAGE requests. * To header and request URI should be urn:service:sos.

  7. IETF 77 Related issue: location in SMS • (Not part of this draft, but needs to be solved) • Location delivery: • out of band: there is (generally) no p-ANI • also fails for international visitors, among others • in-band: add information to SMS • 160 limit  compression

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