Voice Call Control Redundancy Across Independent Networks
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Solution Overview
Problem
Existing voice communication systems lack robustness against server failures and communication path failures, particularly in scenarios where server switching is not expected across the entire communication path.
Innovation Solution
Implementing a voice communication system with server redundancy by installing server systems on different networks and connecting them via a dedicated communication line, allowing active and standby call control servers to operate in parallel, with management servers maintaining status tables to facilitate seamless switching in case of failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If server redundancy is implemented by installing server systems on different networks connected via dedicated communication lines, then robustness against communication path failures is improved, but device complexity increases
Solution Approach 1:
The system divides the server infrastructure into multiple independent server systems (first server system 2-1 and second server system 2-2) deployed on different networks (first LTE network 3-1 and second LTE network 3-2). Each server system contains separate call control servers (21-1, 21-2) and management servers (20-1, 20-2), creating segmented redundant pathways that can operate independently when communication paths fail.
Solution Approach 2:
The system dynamically changes operational parameters by switching between active and standby modes for different server systems based on network conditions. When the primary communication path fails, the system changes the operational state of the standby server system from idle to active, maintaining service continuity through parameter-based state transitions.
2Reliability
If active and standby call control servers operate in parallel with automatic switching capability, then reliability against server failures is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary actions by pre-configuring standby call control servers (21-2) and management servers (20-2) with all necessary operational parameters and credentials before failures occur. The standby servers are kept ready with updated management tables and authentication information, enabling immediate takeover without complex real-time configuration during failure events.
Solution Approach 2:
The management servers (20-1, 20-2) continuously monitor the operational status of call control servers through feedback mechanisms. When a server fails, the feedback loop triggers automatic switching by updating management tables and notifying relevant components, reducing the complexity of manual intervention while maintaining high reliability through continuous status monitoring and automated response.
Data Source
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AI summary
Provided is a server system robust against acommunication path failure. A first server system 2-1 and a second server system 2-2 are respectively installed on a first network 3-1 and a second network 3-2 provided by common carriers different from each other. The first and second server systems are connected to each other by a dedicated line Even when a failure occurs in the first network, communication through the second network can be maintained, and even when a failure occurs in the second network, communication through the first network can be maintained. Further, when a failure occurs in the dedicated line, operations can be performed within each of the first and second networks in a degeneracymode.