What really causes outages
Carrier issues, single‑DC dependencies, misconfigured routing, and untested failovers are the usual suspects. Quantify risk by BHCA, site criticality, and historical incident data.
Multi‑DC reference architectures
Active‑active for critical inbound; active‑passive for back‑office lines. Test failover quarterly. Keep config as code; version everything.
Multi‑carrier ingress/egress
Don’t let one carrier be a single point of failure. Use intelligent routing and automatic re‑tries. Monitor answer‑seizure ratios and call quality per carrier.
Monitoring that matters
Synthetic calls, MOS/jitter dashboards, threshold‑based alerts, and black‑box tests across geos. Tie alerts to on‑call schedules.
Runbooks & SLAs
Document detection, escalation, and comms templates. Negotiate SLAs with credits that actually matter—and insist on RCAs with preventive actions.
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