Spare Switch Redundancy in Distributed VoIP Systems
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Solution Overview
Problem
Distributed VoIP systems face high costs and inefficiencies due to the need for redundant switches at each site to ensure availability, as redundancy cannot be shared across sites due to configuration differences, leading to increased costs and resource requirements.
Innovation Solution
The method involves utilizing a spare switch to provide redundancy across multiple sites by registering communication devices with a local or remote spare switch, which is configured with specific site requirements, allowing for efficient distribution of endpoints and reducing the number of necessary switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant switches are added at each site to ensure availability, then system reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges the redundancy resources of multiple sites by allowing a single spare switch at one site to serve as backup for switches at multiple different sites. Instead of each site maintaining its own dedicated spare switch, the system combines the backup capacity across sites, reducing the total number of switches while maintaining reliability through shared redundancy.
Solution Approach 2:
The spare switch is designed with multi-functionality to serve multiple purposes: it can back up the primary switch at its own site, and simultaneously serve as a backup for primary switches at other remote sites. This universal backup capability allows the same hardware resource to provide redundancy for multiple different locations, reducing overall system complexity.
2Reliability
If each site has dedicated redundant capacity to support switch failure, then system reliability is improved, but cost increases
Solution Approach 1:
The patent combines the redundant capacity needs of multiple sites into a single shared resource pool. Instead of each site having dedicated spare capacity, the system merges these requirements and satisfies them with a smaller number of shared spare switches that can be dynamically allocated to any site experiencing a failure.
Solution Approach 2:
The system changes the parameter of redundancy allocation from static and location-specific to dynamic and location-agnostic. The spare switch can change its functional assignment based on which site experiences a failure, allowing the same hardware to provide backup capacity for different sites at different times, thereby reducing the total quantity of redundant capacity needed.
Data Source
AI summary
A distributed VoIP system includes a network and a first switch at a first site coupled to the network. The first switch is configured to provide telephony services to a first communication device. The system also includes a second switch at a second site coupled to the network. The second switch is configured to provide telephony services to a second communication device. The system also includes a spare switch coupled to the network. The spare switch is configured to provide telephony services to the first communication device if the first communication device is unable to register with the first switch, and the spare switch is configured to provide telephony services to the second communication device if the second communication device is unable to register with the second switch.