Unified Messaging Gateway for Branch Office Network Failure

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Solution Overview

Problem

Unified Messaging Voice Mail systems fail to manage calls when the wide area network connecting the Unified Messaging server and branch offices is unavailable, leading to unattended calls and disruptions.

Innovation Solution

A Unified Messaging gateway device is deployed at each branch office to handle calls during network outages, providing prerecorded messages, recording caller inputs, and offering alternative contact information, with the ability to store messages until the network is restored and then hand off processing to the Unified Messaging server.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the Unified Messaging server is located at a data center and protocol converters are located at branch offices connected via WAN, then centralized message management and resource sharing are improved, but system reliability deteriorates when WAN is unavailable

Engineering Contradiction:

Improvecentralized message management capabilityVSAvoidcall handling reliability during network failure

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The gateway device performs preliminary actions by detecting network unavailability conditions and autonomously activating backup call handling modes before complete system failure occurs. The device pre-configures alternative message storage locations and backup routing paths, enabling continuous operation during WAN outages without requiring real-time centralized coordination.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The gateway device acts as an intermediary between the branch office telephone switch and the centralized Unified Messaging server. During network failures, it mediates call handling by locally storing messages, providing alternative contact information, and maintaining protocol conversion functionality, thereby bridging the gap between distributed branch offices and the centralized server.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the gateway device handles all calls during network outage, then service continuity is improved, but device complexity increases

Engineering Contradiction:

Improveservice continuity during network outageVSAvoidgateway device operational complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The gateway device implements self-service capabilities by autonomously detecting network failures, making decisions about call routing, storing messages locally, and providing alternative contact information without requiring continuous centralized control. This self-managed operation maintains service continuity while avoiding the need for complex centralized coordination during outages.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The call handling functionality is segmented into primary mode (normal network operation with centralized server) and secondary mode (network failure mode with local gateway handling). This segmentation allows the gateway to manage complexity by implementing only the necessary backup functions during outages while maintaining simple normal operation through standardized protocol conversion.

Inventive Principle:

Principle #1Segmentation

3Loss of information

If the gateway records all incoming calls during network unavailability, then information preservation is improved, but storage requirements and processing load increase

Engineering Contradiction:

Improvemessage preservation during network failureVSAvoidstorage capacity and processing resources required

Core Design Contradiction:

Loss of informationVSQuantity of substance

Solution Approach 1:

The gateway implements partial action by recording only essential call information during network outages rather than all call data. It selectively stores message content, caller identification, and contact information while omitting redundant data, thereby preserving critical information while minimizing storage requirements and processing load during the outage period.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS8144842B2Unified messaging gateway device for providing operation during a network failure

Publication Date: 2012.03.27 MICROSOFT TECHNOLOGY LICENSING LLC

AI summary

A Unified Messaging (UM) gateway device located at a branch office of a UM system manages calls if the network connecting the branch office to a UM server of the UM system is unavailable. The UM gateway device contains relatively simple hardware and software as compared to the hardware and software of a UM server. The UM gateway device provides call answering functionality, in the absence of the UM server. In various configurations, the UM gateway device provides access to mailboxes, manages incoming calls, provides an outgoing message (e.g., an announcement or prompt), provides an indication where the called-for person can be reached, and, when the network becomes available, returns management of incoming calls to the UM server and/or handles incoming calls in conjunction with the Unified Messaging server.