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Comparison

FusionPBX vs 3CX

FusionPBX and 3CX both land on Depends.

3CX

3cx.com

Depends
Confidence: Medium

Buy only if you have IT staff to run and patch a VoIP PBX and want cheap simultaneous-call pricing.

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FusionPBX versus 3CX
CompareFusionPBX3CX
VerdictDependsDepends
Best forITSPs and resellers running hosted multi-tenant PBXCost-conscious SMBs with in-house IT
Who it's not forSmall offices wanting plug-and-play phonesOrgs with no security staff to patch fast
PrivacySelf-hosted software with a track record of public CVEs since 2019, including RCE; hardening is the operator's responsibility.⁷Signed desktop app compromised in a 2023 nation-state supply-chain attack; repeated CVEs and exposure alerts since.12
Support qualityCommunity forums unless you pay membershipUsers report poor vendor support
Public sentimentVoIP admins on Reddit favor FusionPBX for on-prem and multi-tenant work but lean heavily on community forums, tutorials, and forks to fill documentation gaps.⁵Splits hard: fans cite price, features, and ease of use, while detractors cite poor support and security baggage.
Biggest gotchaSelf-hosted: firewalling, fail2ban, and TLS hardening are entirely your jobLicensed per simultaneous call, not per user . misestimate and calls block or you overpay

Pick FusionPBX when

  • ITSPs and resellers running hosted multi-tenant PBX
  • IT teams with Linux and SIP experience
  • Budget-driven self-hosters replacing legacy phone systems
  • Hobbyists . it even runs on a Raspberry Pi

When FusionPBX is not a fit

  • Small offices wanting plug-and-play phones
  • Non-technical buyers with no Linux admin
  • Teams needing vendor SLAs and managed updates
  • Anyone unwilling to own PBX security hardening

Pick 3CX when

  • Cost-conscious SMBs with in-house IT
  • MSPs managing phone systems for clients
  • Teams replacing legacy Avaya-style PBXs
  • Self-hosters wanting SIP control

When 3CX is not a fit

  • Orgs with no security staff to patch fast
  • Buyers needing reliable vendor support
  • Non-technical teams wanting plug-and-play phones
  • Security-sensitive orgs post-supply-chain-attack

Sources

  1. FusionPBX official sitefusionpbx.com
    official
  2. FusionPBX on GitHubgithub.com
    official
  3. FusionPBX Membersfusionpbx.com
    official
  4. Opinions on FusionPBX . r/VOIPreddit.com
    review
  5. On Premise PBX recommendations . r/VOIPreddit.com
    review
  6. Migrating from FreePBX to FusionPBX . r/VOIPreddit.com
    review
  7. FusionPBX 4.5.29 RCE . Exploit-DBexploit-db.com
    security
  8. CVE-2024-23387cve.org
    security
  9. Introducing FusionPBX . Nerd Vittlesnerdvittles.com
    news
  10. FusionPBX Tutorial . WhichVoIPwhichvoip.com
    review
  11. FusionPBX Docs . Securitydocs.fusionpbx.com
    official
  12. The Huge 3CX Breach Was Actually 2 Linked Supply Chain Attacks . Wiredwired.com
    news
  13. 3CX Supply Chain Attack, Campaign C0057 . MITREattack.mitre.org
    security
  14. 3CX Phone System Local Privilege Escalation . Praetorianpraetorian.com
    security
  15. CVE-2023-49954 . SentinelOnesentinelone.com
    security
  16. Security Alert: Update your Self-Hosted 3CX Deployment3cx.com
    official