The Future of Telephony is Browser-Based

Cloud Calling vs.
On-Premise Systems

Is your business still paying for hardware maintenance and expensive PBX upgrades? Discover why 82% of modern enterprises are switching to browser-based cloud calling to reduce TCO and enable remote work.

See Cost Analysis

On-Premise PBX

  • High upfront hardware costs (CapEx)
  • Requires physical space & cooling
  • Expensive maintenance contracts
  • Difficult to scale (add/remove lines)
  • Tied to one physical location

Cloud Calling (VoIP)

  • Zero upfront hardware costs (OpEx)
  • No physical maintenance required
  • Automatic free updates
  • Scale instantly via dashboard
  • Work from anywhere (Browser/Mobile)

Total Cost of Ownership (TCO) Analysis

Over a 5-year period, cloud calling systems like StartACall save businesses an average of 60% compared to traditional systems.

Cost CategoryOn-Premise PBXCloud Calling
Initial Hardware$5,000 - $20,000+$0
Setup & InstallationTechnician fees ($150/hr)Free (Self-service)
MaintenanceAnnual contracts (15-20%)Included
Call RatesHigh carrier ratesWholesale VoIP rates
ScalabilityBuy new hardware modulesInstant (Click to add)
5-Year Estimate$$$$ Very High$ Low

Always Up-to-Date

On-premise systems age quickly. Cloud systems receive new features (like AI integration) automatically without you lifting a finger.

Disaster Recovery

If your office loses power or internet, on-premise phones die. With Cloud, you just switch to mobile or home Wi-Fi instantly.

Remote Work Ready

Employees can take calls from the office number while at home, in a coffee shop, or traveling abroad via the browser.

Ready to ditch the hardware?

Migrating to the cloud takes less than 5 minutes with StartACall. No technicians, no downtime, and you can keep your existing numbers.

Planning the Actual Migration from PBX to Cloud

In short

The cost case above answers whether to move. This section covers how: sequencing a parallel run, porting your numbers without downtime, preparing the network, retiring the old hardware, and timing the switch around your maintenance contract. A PBX migration fails on logistics far more often than on technology.

Run both systems in parallel first

Never plan a hard cutover weekend. Instead, stand up the cloud service alongside the PBX and move outbound calling first, since it carries no dependency on your existing numbers. A browser-based service makes this trivially cheap: with StartACall, outbound calls need no number purchase and no subscription, so the parallel phase costs only the minutes the pilot group actually uses.

Keep inbound on the old system while the team builds confidence outbound. Two to four weeks of parallel running surfaces the real issues, headsets, network quirks, workflow gaps, while customers still reach you exactly as before.

Number porting is the critical path

Your published numbers are the asset customers actually know, and porting them is the one step with a waiting period you cannot compress. Start the port request early, keep a recent carrier bill handy since porting validations check account details exactly, and schedule the port date after the parallel run has proven the new setup.

Until the port completes, a simple bridge is to forward the old numbers to the new system. Callers notice nothing, and you get inbound traffic flowing through the cloud service before the irreversible step.

Audit every place the old numbers are published before the port date: the website footer, Google Business Profile, invoices, email signatures, and printed materials. Porting preserves the number, but the audit often uncovers forgotten lines, fax numbers, and alarm system dialers that need their own plan.

Prepare the network before the phones

On-premise phones ran on their own wiring, so moving voice onto the office internet connection deserves a check. Confirm your uplink has headroom for simultaneous calls, each needing under 100 kbps but sensitive to congestion, and enable quality of service on the router if large transfers share the line.

Also test from the real endpoints: staff laptops on office Wi-Fi, home networks for hybrid workers, and any VPN in the path. A one-week test log of call quality by location is worth more than a speed test.

Plan for internet outages explicitly, since cloud calling shares the office connection's fate. The mitigation is inherent to the model: staff sign in from home connections or mobile hotspots and keep calling, which is precisely the resilience an on-premise system tied to one building cannot offer.

Retiring the PBX and closing contracts

Time the switch against your maintenance contract renewal, since those agreements often auto-renew annually and cancellation windows are strict. Give notice as soon as the migration date is credible, and get the cancellation confirmed in writing rather than assuming a phone conversation ended the agreement.

Decommissioned PBX hardware still holds call records and configuration with internal extensions and credentials, so wipe it before resale or disposal. Keep an export of historical call logs for whatever retention period your industry requires, because once the maintenance contract lapses you may lose access to the reporting tools that read them.

Frequently asked questions

How long does it take to migrate from an on-premise PBX to cloud calling?+

Small offices commonly complete it in four to eight weeks, dominated by number porting and the parallel run. The cloud side itself is fast; a browser-based service can be making outbound calls the same day you create accounts.

Can we keep our existing business phone numbers when moving to the cloud?+

Usually yes, through number porting between carriers. The process takes days to weeks depending on carrier and country, so start early and use call forwarding from the old numbers as a bridge during the transition.

What should we do with old PBX hardware after migrating?+

Export any call records you must retain, then wipe configuration and credentials before disposal or resale. Also cancel the maintenance contract within its notice window, since those agreements often auto-renew for a full year.

Do we need new internet bandwidth for cloud calling?+

Rarely for capacity, since each call uses under 100 kbps. What matters is consistency: enable router quality of service if backups or video share the line, and test call quality from real workstations before cutover.

What is the lowest-risk first step in a PBX migration?+

Move outbound calling to the cloud first while inbound stays on the PBX. Outbound needs no ported numbers, and on pay-as-you-go services like StartACall it needs no subscription either, so the pilot risks only the minutes used.

Last reviewed June 2026Reviewed by the StartACall calling teamDialing rules cross checked against ITU international dialing procedures
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