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Enhancing SIP Response Identity: Protocol Draft and Implementation Strategies

This draft outlines the SIP Response Identity protocol, focusing on its necessity and implementation requirements. It highlights the inadequacies of existing header fields like "To" and "Contact," stressing the need for a robust response identity framework that ensures backward compatibility and protects user anonymity. The draft discusses mechanisms for verifying response integrity, addressing open issues, and providing solutions for response identity enforcement. Key considerations include the roles of User Agents (UAs) and proxies, as well as potential challenges like spoofing and complexity in implementation.

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Enhancing SIP Response Identity: Protocol Draft and Implementation Strategies

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  1. Response Identity in Session Initiation Protocoldraft-cao-sip-response-identity-00 Feng Cao Cullen Jennings

  2. Agenda • Introduction • Scope • Requirements • SIP Response Identity • Overview • Open Issues • Summary

  3. Introduction: Scope • Why response identity? • Cannot rely on the existing header fields, such as “To:”, “Reply-to:” and “Contact:”, in all the scenarios • Need response identity as early as possible • Provide response identity in non-dialog session • Provide proxy’s identity for confirming certain response codes • Prevent response identity spoofing as early as possible • Scope of this response identity draft • Provide response identity inside response message with the security mechanism for verifying the integrity of response identity.

  4. Introduction: Requirement • The mechanism must be backward compatible • The identity must be clearly specified in the header by the responder (or its proxy) • The identities of both UAs and proxies must be covered • The integrity of SIP response must be partially covered along with the responder’s identity • The enforcement of providing response identity must be provided through the originator’s request. • Open question: Anonymity of response identity?

  5. Enforcement of Response Identity • UAC (or its proxy) should be able to ask for response identity • Required: responder-id • Open question: can any intermediate proxy ask for it? • Responder (UAS or proxy) should be able to decline to disclose the response identity • Warning: 380 Response Identity Cannot be Revealed • Open question: the exact behavior and the consequence?

  6. DAS-basedApproach proxy-1@source.com proxy-2@destination.com alice@source.com bob@destination.com INVITE bob 180 Ringing Responder: claimer=bob@destination.com; verify-method=DAS; Responder-Info: https://www.destination.com/certs; algo=rsa-sha1 Identify: akfjiqiowrgnavnvnnfa2o3fafanfkfjakfjalkf203urjafskjfaf Jprqiyupirequqpiruskfka Note:Domain-based Authentication Service (DAS)

  7. AIB-basedApproach proxy-1@source.com proxy-2@destination.com alice@source.com bob@destination.com INVITE bob 180 Ringing Responder: claimer=bob@destination.com; verify-method=AIB; Responder-Info: https://www.destination.com/certs; algo=rsa-sha1

  8. Open Questions • Is AIB needed? • Advantage: Anonymity can be achieved • Disadvantage: • Complexity and processing delay • end-to-middle security • the new response code? • 403 ‘Failed Responder Identity’ • The behavior and consequence for dealing with the enforcement? • Warning: 380 Response Identity Cannot be Revealed

  9. Summary • Scope and requirement for response identity • Some solutions are provided • Open questions • Next Step?

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