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Emergency Services for Internet Communications IETF ECRIT Working Group Fall VON 2005

Emergency Services for Internet Communications IETF ECRIT Working Group Fall VON 2005 Hannes Tschofenig (Siemens) Marc Linsner (Cisco) Working Group Chairs IETF Work Group ECRIT – Emergency Context Resolution using Internet Technologies BOF IETF#61(Washington, Nov. 2004)

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Emergency Services for Internet Communications IETF ECRIT Working Group Fall VON 2005

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  1. Emergency Services for Internet CommunicationsIETF ECRIT Working GroupFall VON 2005 Hannes Tschofenig (Siemens) Marc Linsner (Cisco) Working Group Chairs

  2. IETF Work Group • ECRIT – Emergency Context Resolution using Internet Technologies • BOF IETF#61(Washington, Nov. 2004) • BOF Chairs: Jon Peterson, Hannes Tschofenig • Official WG, first meeting in Minneapolis (IETF#62) on March 9 • Chairs: Hannes Tschofenig, Marc Linsner • Working group had an interim meeting in New York (Columbia University), May 2005 • Charter Page: • http://www.ietf.org/html.charters/ecrit-charter.html • Weblog: • http://www.ietf-ecrit.org • Narrowly chartered to deal with how to route emergency calls. • You would like to learn more about the IETF: • Look at IETF Education Team: http://edu.ietf.org/ VON Fall 2005

  3. ECRIT Topics (1/2) • Terminology and requirements • Threats and Security Considerations • Identify an Emergency Call • Currently actively discussed • draft-taylor-ecrit-security-threats-00.txt • draft-ietf-ecrit-requirements-00.txt VON Fall 2005

  4. ECRIT Topics (2/2) • Mapping protocol • ... and some more topics • Good news: IETF protocols offer a good source for reuse. VON Fall 2005

  5. ECRIT Relationships • IETF Geopriv Working Group: • Location Information based on GML (civic and geospatial) http://www.ietf.org/internet-drafts/draft-ietf-geopriv-pidf-lo-03.txt • Distribution of location information in DHCP RFC 3825http://www.ietf.org/internet-drafts/draft-ietf-geopriv-dhcp-civil-07.txt • SIP working group: • Plenty of SIP protocol specific work • Session Initiation Protocol Location Conveyance http://www.ietf.org/internet-drafts/draft-ietf-sip-location-conveyance-01.txt VON Fall 2005

  6. Architectural Considerations (1/3) • Who knows the location of the end host? • Often the access network, the Internet service provider and the application service provider are different parties. OSI Model Common point - The end device! VoIP, Inc. (Application Service Provider) Layer 7 ISP, Inc. (Internet Service Provider) Layer 3 Last Mile, Inc. (Access Provider) Layer 2 VON Fall 2005

  7. Architectural Considerations (2/3) • SIP Proxy extract location+identity+… determine language determine media 911 Contact PSAP Phone PSAP Fetch Location Determine PSAP Distributed Directory Query / Response Protocol 48° 49' N 2° 29' E  Paris fire department • Assumption: Network intermediary is able to obtain location of end host. VON Fall 2005

  8. Architectural Considerations (3/3) extract user location+identity+… determine language determine media Contact PSAP PSAP Phone Fetch Location Query / Response Protocol determine PSAP location Distributed Directory 48° 49' N 2° 29' E  Paris fire department VON Fall 2005

  9. Next Steps: Develop Mapping Protocol (1/2) • A few proposals are available for discussion: • Location-to-URL Mapping Protocol (LUMP) • http://www.ietf.org/internet-drafts/draft-schulzrinne-ecrit-lump-00.txt • Emergency Call Information in the Domain Name System (DNS-SOS) • http://www.ietf.org/internet-drafts/draft-rosen-dns-sos-02.txt • An IRIS Schema for Emergency Service Contact URIs (ECON) • http://www.ietf.org/internet-drafts/draft-hardie-ecrit-iris-01.txt • Requirements and security threats need to be understood before the work on the mapping protocols can be completed. VON Fall 2005

  10. Next Steps: Challenges (2/2) • A number of security threats need to be addressed. • The typical solution, namely cryptography, cannot be applied in all cases. • Difficult part: Denial of Service • Example: Adversary places an emergency call and attaches the wrong location information. Denial of Service Layers of Defense VON Fall 2005

  11. Questions? VON Fall 2005

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