Dual Call Manager Registration for SIP Failover
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Solution Overview
Problem
Existing SIP call management systems experience prolonged unavailability and increased service delays due to the time-consuming process of detecting proxy unavailability and switching to backup proxies, which affects user phone service continuity and efficiency.
Innovation Solution
Implementing a dual-call manager registration system where endpoints connect to both primary and secondary call managers, sending keep-alive signals to ensure quick failover and failback processes, minimizing service disruptions and maintaining call session continuity through multiple call control and configuration management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the phone uses Domain Name Servers to detect proxy unavailability, then the system can provide backup proxy functionality, but the detection time is considerable and increases phone unavailability
Solution Approach 1:
The patent applies preliminary action by having the phone maintain continuous connections to both primary and backup proxies and sending periodic keep-alive signals to both. This preliminary setup and monitoring eliminates the need for time-consuming Domain Name Server queries when failure occurs, as the backup proxy is already identified and ready for immediate failover.
2Reliability
If the phone attempts to connect to backup proxy when original proxy fails, then service continuity can be maintained, but the process takes additional time using Domain Name Servers
Solution Approach 1:
The phone performs preliminary action by pre-establishing connections to both primary and backup proxies and continuously sending keep-alive signals to both. When the primary proxy fails, the backup proxy is already identified and connected, enabling immediate failover without time-consuming Domain Name Server queries.
Solution Approach 2:
The patent implements feedback by having the phone continuously send keep-alive signals to both primary and backup proxies and monitoring their responses. This feedback mechanism enables real-time detection of proxy failures and triggers immediate failover to the backup proxy, significantly reducing service disruption time.
3Reliability
If the phone maintains connection with multiple call managers, then failover capability is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by having the phone simultaneously register with and maintain connections to both primary and backup call managers before any failure occurs. This pre-established dual connection architecture simplifies the failover process, as the phone only needs to switch registration between the two pre-configured call managers rather than performing complex discovery and registration procedures during failure events.
Data Source
AI summary
Registering with a call manager includes connecting to a first call manager and a second call manager. The endpoints register with the first call manager and send keep-alive signals to the first call manager and the second call manager. If a failure is detected in the first call manager, the system initiates a failover process. The endpoints re-register with the first call manager when the first call manager regains operability.