Stateless SIP B2BUA Using Record-Route Headers for Dialog State
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Solution Overview
Problem
Current Session Initiation Protocol (SIP) back-to-back user agents (B2BUA) face challenges in managing SIP dialog state, leading to significant data storage requirements and complex synchronization and recovery mechanisms under heavy loads.
Innovation Solution
A stateless SIP B2BUA method and system that receives and transforms SIP messages, using record-route and via headers to transfer and reconstruct necessary dialog state data, allowing for the transmission of transformed requests and responses to new destinations without maintaining explicit dialog state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a B2BUA maintains SIP dialog state by storing necessary data locally or remotely, then it can process messages properly, but it requires significant amounts of data storage and complicated mechanisms for data synchronization and recovery
Solution Approach 1:
The patent extracts the dialog state data from the B2BUA's local storage and relocates it to the endpoint devices. The B2BUA no longer maintains dialog state locally, but instead relies on endpoints to store and manage their own dialog state information, thereby eliminating the complex storage and synchronization mechanisms while maintaining message processing capability
Solution Approach 2:
The patent introduces record-route headers and via headers as intermediaries to transfer dialog state data between the B2BUA and endpoints. These headers serve as a mechanism to convey necessary dialog information without requiring the B2BUA to maintain local state, thus resolving the contradiction between reliability and complexity
2Adaptability or versatility
If a B2BUA stores dialog state data locally or remotely, then it can participate in all requests sent on the dialogs, but it requires significant data storage capacity under heavy load
Solution Approach 1:
The patent extracts dialog state data from the B2BUA's storage system and places it at the endpoints. The B2BUA remains adaptable to all dialog requests by relying on endpoints to provide necessary state information through SIP message headers, thereby maintaining versatility while eliminating the need for significant data storage capacity
Solution Approach 2:
The patent creates copies of dialog state information in the form of record-route headers and via headers that are transmitted with SIP messages. These headers contain the necessary dialog state data that the B2BUA needs to participate in requests, eliminating the need for the B2BUA to store large amounts of data locally
Data Source
AI summary
A method for providing a stateless Session Interface Protocol (SIP) back to back user agent (B2BUA) comprising receiving a SIP message and determining if the SIP message is a SIP request. The SIP request further comprises a request to create an original SIP dialog or a request for an existing SIP dialog. Method further comprises determining if the SIP message is a SIP response. The SIP response may further comprise a provisional SIP response or a final SIP response. Method is suitable for transforming the SIP request, transforming the SIP response, transmitting the transformed SIP request to a new destination, and transmitting the transformed SIP response to a request originator.