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Marking of Calls initiated by Public Safety Answering Points (PSAPs)

This document addresses the need for Public Safety Answering Points (PSAPs) to reach original emergency callers immediately or within a reasonable interval after disconnect, proposing solutions to bypass call treatments that hinder communication. It discusses complications such as unknown caller addresses and the prevention of abuse by non-emergency callers. Various solution approaches are presented, including specific notification messages and call-back strategies for emergency and non-emergency calls, aiming to provide reasonable expectations for call follow-up procedures.

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Marking of Calls initiated by Public Safety Answering Points (PSAPs)

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  1. Requirements for Marking of Calls initiated by Public Safety Answering Points (PSAPs) Henning Schulzrinne Stephen McCann Gabor Bajko Hannes Tschofenig IETF - ECRIT

  2. Problem space • PSAP wants to reach original emergency caller • immediately (e.g., after disconnect) • within some reasonable interval (minutes? days?) • Original caller: • same device (GRUU) • some device for same caller (Contact, From) • Want to bypass call treatments that may prevent call • call forwarding • call rejection (SPIT filtering, time-of-day rules, …) • other calls? • Non-goal: preferential treatment in the “network” IETF - ECRIT

  3. Complications • Caller address may be unknown to original caller • call forwarding to first responders • ESNet multiple resolution steps • PSTN forwarding • Prevent abuse by non-emergency callers • will be abused by telemarketers IETF - ECRIT

  4. Solution approaches • “This is a PSAP” • “This is an emergency-related call” • might apply to notification problem • “This is a return call for your call” • generalizes to non-emergency calls IETF - ECRIT

  5. TBD • Sufficient starting point? • Limit duration of call back time window? • provide reasonable expectations • allow soft state for call-related state • does not matter with identity-based schemes IETF - ECRIT

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