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Hysteresis Histrionics: Preventing Outages Triggered By SIP Server Failover

Presented by Mark Lindsey, MTS, ECG.

In late 2018, multiple large-scale SIP operators suffered service interruptions due to instability when SIP UAs (such as SIP phones) failover and begin en masse to use a different SIP server. The receiving servers were operational with no intrinsic problem, but the failover process itself triggered instability. This talk presents example data from these events, analyzes the causes for failover-triggered outages, and methods to make SIP operators with redundant operations more robust.