SIP Client Authentication via Request Headers

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Solution Overview

Problem

In Session Initiation Protocol (SIP) systems, the user agent client (UAC) cannot initiate authentication of the user agent server (UAS), leading to security vulnerabilities in peer-to-peer relationships between coequal service providers, where the existing authentication mechanisms are inadequate.

Innovation Solution

The system allows a UAC to initiate authentication by including an authenticate header and a require header with a server authentication tag in SIP requests, enabling the UAC to request and validate the UAS's credentials, thereby enhancing security and reducing the number of message exchanges required for authentication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional SIP authentication mechanisms are used, then the server can authenticate the client, but the client cannot initiate authentication of the server, leaving peer-to-peer relationships insecure

Engineering Contradiction:

Improveauthentication securityVSAvoidauthentication initiation capability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent inverts the traditional authentication model where only the server could initiate authentication. Now the client (UAC) can also initiate authentication of the server (UAS) by including authentication headers in its SIP requests, enabling mutual authentication in peer-to-peer relationships

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The SIP request message is enhanced with multiple headers (authenticate header, require header with server authentication tag) that enable the client to perform both client authentication and server authentication functions within a single request message

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If traditional authentication methods are used, then authentication can occur, but the number of message exchanges is high

Engineering Contradiction:

Improveauthentication completionVSAvoidmessage exchange count

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent combines multiple authentication functions into a single SIP request message by including both the authenticate header (for client authentication) and the require header with server authentication tag (for server authentication), reducing the number of separate message exchanges needed

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7591013B2System and method for client initiated authentication in a session initiation protocol environment

Publication Date: 2009.09.15 CISCO TECHNOLOGY INC

AI summary

A system for client initiated authentication comprises a user agent client and a user agent server. The user agent client is operable to communicate a session initiation protocol request. The session initiation protocol request comprises an authenticate header and a require header that comprises a server authentication tag. The user agent server is operable to receive the session initiation protocol request. The user agent server is further operable to communicate a session initiation protocol response in response to the session initiation protocol request. The session initiation protocol response comprises an authorization header having a credential of the user agent server.