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Telephony

Cloud PBX or on-premise PBX: which model fits the business?

The decision is not simply monthly fee versus hardware cost. It depends on how the business works when the internet fails, who manages changes, and whether branches need one numbering plan.

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Reviewed by Alpha Beta Systems Engineering Field-informed technical guidance
2 min read Last technical review: 13 Aug 2026 Editorial policy
Unified business communications for customers and teams
Business communications

Start with the failure scenario

Ask what must keep working during an internet or power outage. A cloud service depends on connectivity; an on-site system depends on local equipment and support. Dual links and mobile failover may change the answer.

Compare operating effort

Cloud platforms simplify remote extensions and updates. On-premise systems offer more local control but need maintenance, backups and a clear replacement plan.

Count the complete cost

Include licences, handsets, trunks, support, recording, backup connectivity and expansion—not only the first invoice.

Project checklist

  • Document call flows, opening hours and emergency numbers
  • Confirm recording, retention and access permissions
  • Test voice quality and failover before handover

Practical takeaways

  • Define the operating requirement before choosing products
  • Document interfaces, failure behaviour and ownership
  • Test the completed system and keep records for support
FAQ

What clients ask us.

Can branches share one number plan?
Yes. Both models can support it, but the WAN design, licences and survivability plan must be confirmed.
Is cloud always cheaper?
No. It can reduce initial hardware, but recurring licences, connectivity and support must be compared over the expected life.
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