Interaction ID for SIP Session Continuation in DNS Mode
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Solution Overview
Problem
Existing communication servers face challenges in managing multiple communication pathways within a single session, particularly when in a Deny New Service (DNS) mode, as they struggle to associate new messages with existing sessions across different protocols, leading to disruptions and inefficiencies.
Innovation Solution
The introduction of an 'interaction ID' allows servers to associate new messages with existing SIP sessions even in DNS mode, enabling the continuation of communication sessions without additional overhead, by specifying the interaction ID in callback URLs and ensuring that messages related to ongoing interactions are processed, even when the server is in DNS mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the server is placed in Deny New Service (DNS) mode to shed communications when overloaded or enable maintenance, then existing communication tasks are allowed to continue but new tasks are declined, but this causes the server to be unable to accept new communication sessions even when they are associated with existing interactions
Solution Approach 1:
The patent segments the communication session identification into two distinct components: session ID and interaction ID. The session ID identifies a specific communication session, while the interaction ID identifies the broader interaction context. This segmentation allows the server to distinguish between completely new interactions (which should be denied in DNS mode) and new sessions that are part of existing interactions (which should be accepted), thereby resolving the contradiction between maintaining existing tasks and accepting relevant new sessions.
Solution Approach 2:
The patent introduces a new dimension to session identification by adding the interaction ID layer above the traditional session ID. This dimensional enhancement allows the server to evaluate incoming sessions from multiple perspectives: the specific session level and the broader interaction level. By checking both dimensions, the server can make more nuanced decisions about whether to accept or deny new sessions in DNS mode, resolving the binary contradiction.
2Productivity
If the server denies all new messages in DNS mode to manage load, then server overload is reduced, but this prevents association of new messages with existing sessions across different protocols
Solution Approach 1:
The interaction ID serves as a universal identifier that spans multiple communication protocols (SIP, HTTP, web chat). By using this protocol-agnostic identifier, the server can maintain interaction context across different protocol boundaries even when in DNS mode. This universality allows the server to selectively accept cross-protocol messages that belong to existing interactions while still denying unrelated new messages, thus managing load without losing interaction context.
Solution Approach 2:
The interaction ID acts as an intermediary that bridges different communication protocols and sessions. When a new message arrives with an interaction ID that matches an existing interaction, this intermediary identifier enables the server to recognize the message's relevance and process it appropriately, even in DNS mode. This mediator mechanism prevents loss of interaction context while maintaining load management.
3Measurement precision
If the server uses traditional session ID identification, then individual communication sessions can be tracked, but this prevents recognition that multiple sessions belong to the same interaction
Solution Approach 1:
The patent segments the identification hierarchy into session ID (for tracking individual sessions with precise accuracy) and interaction ID (for recognizing broader interaction context). This segmentation allows the system to maintain precise session-level tracking while simultaneously enabling interaction-level recognition, resolving the contradiction between measurement precision and information completeness.
Solution Approach 2:
By adding the interaction ID dimension to the traditional session ID system, the patent enables multi-level identification. The session ID provides precise tracking at the session level, while the interaction ID adds a new dimension that reveals the broader interaction context. This dimensional enhancement allows the server to recognize that multiple sessions with different session IDs belong to the same interaction, preventing loss of interaction-level context.
Data Source
AI summary
Communication servers hosting interactions between requesting devices and resources may require load sheading or maintenance and, as a result, be placed in Deny New Service (DNS) mode, whereby a subsequent session request is refused while existing sessions continue until concluded. However, an interaction comprising an existing session may be supplemented by a subsequent session, often utilizing a different application layer implementation. By providing the requesting device with an interaction identifier, a subsequent session made after the server has been placed in DNS mode, may be accepted and associated with the same resource associated with the existing session.