SIP Resource Manager Probe-Based Failover Recovery
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Solution Overview
Problem
In contact center systems, failures in SIP server connections can lead to unsuccessful message transmissions, causing service disruptions and making it difficult to determine the cause of failures, which affects the smooth operation of calls.
Innovation Solution
A system that includes a processor and memory to transmit and receive signaling messages, detect data network connection losses, and dynamically adjust retry parameters such as timeout values and number of retries based on learned conditions, allowing for retransmissions of failed messages and monitoring network communication to route calls appropriately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backup SIP server takes over the virtual IP address of the primary SIP server during failover, then service continuity is improved, but message transmission fails during the switchover period when the virtual IP is freed
Solution Approach 1:
The system sends a probe message to the SIP server before attempting message transmission. This preliminary action detects whether the server is currently accepting connections, preventing transmission attempts during the vulnerable switchover period when the virtual IP is freed but not yet bound to the backup server
Solution Approach 2:
The system implements a feedback mechanism where probe messages are sent to verify SIP server connectivity status. Based on the probe response, the system dynamically adjusts its message transmission behavior - retrying if the probe succeeds or marking the server as unavailable if the probe fails, thus avoiding transmission during failover gaps
2Ease of operation
If the system assumes no SIP server connectivity when message transmission fails, then simple error handling is achieved, but the actual cause of failure is misidentified affecting call servicing
Solution Approach 1:
The system sends probe messages to the SIP server to obtain feedback about the actual server status. This feedback distinguishes between genuine connectivity failures and temporary transmission issues during switchover, enabling accurate failure cause identification while maintaining simple error handling through automated probe-based decision making
Solution Approach 2:
Before concluding that no SIP server connectivity exists, the system performs a preliminary probe message transmission to verify the server's actual status. This preliminary action prevents premature failure assumptions and ensures accurate identification of the failure cause
3Device complexity
If retry parameters are fixed, then system simplicity is maintained, but service disruption cannot be effectively reduced during varying network conditions
Solution Approach 1:
The system dynamically adjusts retry parameters (timeout values, number of retries) based on probe message responses and detected network conditions. Instead of fixed parameters, the system adapts its retry behavior in real-time, increasing retries during temporary failures and reducing them when genuine connectivity issues are detected, thereby improving service disruption handling without requiring complex manual configuration
Data Source
AI summary
A system for providing media services on behalf of a customer contact center includes: a processor; and a memory, wherein the memory has stored thereon instructions that, when executed by the processor, cause the processor to: transmit and receive signaling messages to and from a control server over an established data network connection; in response to the signaling messages, invoke a media device for transmitting media to an end-user device; detect loss of the data network connection; identify a configurable parameter for determining whether a failed message transmission should be retried; and in response to determining that the failed message transmission should be retried, re-transmitting the failed message to the control server.