Cloud Infrastructure

Migrating from legacy PBX to cloud calling at scale

Lessons learned migrating 1,200+ users to a unified cloud PBX across 14 branches.

Voice EngineeringMar 28, 20256 min read

The migration playbook

Number porting, parallel run, branch-by-branch cutover and a rollback path on every change window.

Active-active SIP routing, dual carriers and a softphone fallback meant no branch ever lost dial tone during cutover.

42% telephony cost reduction, four-nines uptime and unified analytics across all branches.

"Engineering excellence is invisible when it works — but the difference is felt every day."
— Voice Engineering

#VoIP#FreePBX#SIP

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