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FreePBX alternative

FreePBX alternatives for UK businesses: when DIY stops paying back.

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The two reasons firms switch.

Reason 1: the Linux person left.

FreePBX is excellent when one person knows it deeply. The risk profile changes when that person is unavailable. The dial plan in your firm's FreePBX system is partly documentation, partly tribal knowledge in that one person's head. When they go, the system keeps running until the day it doesn't — and then no one knows where the call-flow logic lives. We see this pattern monthly.

Migrating to managed 3CX before this happens (rather than during it) is calmer. We document the current call flows, rebuild them on 3CX with clear configuration, and your firm no longer depends on one person's continued employment for the phones to work.

Reason 2: the operational hours stopped paying back.

FreePBX free licence + £180/year hosting + a few hours a month of admin time looks great on paper. The reality at 5-year mark: Asterisk has had multiple security advisories, FreePBX has had two or three major version upgrades each requiring careful migration testing, modules have deprecated, SIP carrier setups have needed adjustment. Across 5 years that's typically 40–80 hours of senior-engineer attention. At £400/day that's £2,000–4,000 of opportunity cost that doesn't appear on the FreePBX invoice.

Managed 3CX puts the operational layer on us. Your firm gets the phone system without the operational tax.

Cost reality.

Honestly: if you have the time and the skills and you enjoy this kind of work, FreePBX continues to be cheaper than managed 3CX. The differential is real — roughly £200–500/month at 50-user scale, depending on what add-on modules you've bought from Sangoma and what your time is worth.

The argument for switching isn't "managed 3CX is cheaper". It's "managed 3CX moves the operational layer to someone else so your firm can focus on what it actually does". That's worth different amounts to different firms.

Migration mechanics.

  1. Week 1 — scoping call. We look at your current FreePBX setup. Modules in use, dial-plan complexity, custom AGI scripts (if any), SIP trunk arrangements, handset inventory. Document the call flows in their current form before migration.
  2. Week 2–4 — 3CX provisioning. UK hosting, Gamma SIP, 3CX licence sized to your user count. Yealink handsets if existing handsets aren't reusable.
  3. Week 3–5 — call-flow rebuild. Asterisk dialplan logic translates to 3CX's Call Flow Designer. Most dial-plan logic maps cleanly; some custom AGI script behaviour requires re-implementation in 3CX's logic. We work through this with your engineering contact during this window.
  4. Week 4–6 — handsets and porting. Existing handsets often reusable (Yealink, Snom, Polycom, Grandstream, Fanvil — all support 3CX provisioning). Number porting from your current SIP carrier to Gamma.
  5. Week 6 — cut-over. Standard pattern.

What about custom dial-plan code?

If your FreePBX is doing genuinely unusual things — calls routed via AGI scripts hitting your CRM API, custom IVR logic that branches on database lookups, regex-based number transformation that's been built up over years — that custom code doesn't port directly to 3CX.

3CX's Call Flow Designer covers most use cases through configuration. For the truly custom logic, 3CX has REST API hooks that let you replicate the behaviour. The translation requires real work — typically 1–3 days of engineering attention from your end plus our involvement. We scope it at the scoping call so the cost and timeline are clear before you commit.

If your custom code is load-bearing for the firm's operations, sometimes the right answer is to stay on FreePBX. We'll tell you that.

When to stay on FreePBX.

Common questions.

Probably yes. Yealink, Snom, Polycom, Grandstream, Fanvil — all support 3CX provisioning. We re-provision them during the migration. Custom SIP handsets configured manually for FreePBX also generally migrate cleanly.
3CX's Call Flow Designer covers most patterns. Translation is mostly configuration, not coding. Truly custom logic re-implements via 3CX API hooks if needed.
Simple FreePBX (basic IVR, a few queues, no AGI custom code) migrates in 4 weeks. Complex setups with custom logic take 6–8.
Usually yes. 3CX integrates with most UK SIP carriers (Gamma, Sippy, Voipfone, Vonage Business UK). We'll keep your existing trunk if it's working and you prefer continuity. Or migrate to Gamma if you're not happy with the current carrier.
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