Compare software

3CX Free BasicAsterisk
Freemium

Free for up to 10 users and 4 simultaneous calls; larger editions are paid.

 Free

Free and open source.

Self-hosted Linux, Self-hosted
  • No licence cost for small teams
  • Runs on your own infrastructure
  • Run your own PBX and VoIP system
  • Flexible enough to build custom telephony setups
  • Limited to 10 users and 4 simultaneous calls
  • Proprietary software
  • Configuration requires telephony knowledge
  • A framework to build on rather than a ready-to-use phone system
Self-hosted Downloadable app, Self-hosted
Closed source Open source
License not stated License not stated
Not stated if an account is needed No account needed
Not stated if it works offline Not stated if it works offline

Checked September 23, 2026

Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.