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ECRIT Direct Calling

ECRIT Direct Calling. draft-winterbottom-ecrit-direct-01 James Winterbottom, Martin Thomson, Hannes Tschofenig, Henning Schulzrinne. Model. Builds on -phone-bcp. Not intended to replace -phone-bcp Location acquisition, route determination is the same

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ECRIT Direct Calling

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  1. ECRIT Direct Calling draft-winterbottom-ecrit-direct-01 James Winterbottom, Martin Thomson, Hannes Tschofenig, Henning Schulzrinne draft-winterbottom-ecrit-direct-01

  2. Model draft-winterbottom-ecrit-direct-01

  3. Builds on -phone-bcp • Not intended to replace -phone-bcp • Location acquisition, route determination is the same • Uses an LCP or local source (e.g., GPS) for location • Differences: • Does not rely on Route header, instead directly contacts the PSAP at the URI provided by LoST • Provides a mechanism for call-back draft-winterbottom-ecrit-direct-01

  4. Advantages • Provides emergency calling for any device • …without a need for a VSP: draft-winterbottom-ecrit-direct-01

  5. Callback • Contact header could be insufficient for callback • Intervening NAT/firewall prevents incoming flow • Devices that wish to allow callback REGISTER with the ESRP using SIP outbound (RFC 5626) • No identity/credentials needed • Potential for new or novel schemes draft-winterbottom-ecrit-direct-01

  6. Security • Problem: hoax calls with spoofed location or identity • LOTS of discussion • Presented complaint: • No intermediary to provide an independent assurance of identity using “transitive trust” • Disagreement on desired properties of any solution: • Identification for post-hoc audit/retribution • Can be for identity OR location information • Call classification for prioritization purposes • Some regions will demand that this not be used • Up to jurisdictional policy draft-winterbottom-ecrit-direct-01

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