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Smart-SIP-Phone vs Calls: catalog facts
Smart-SIP-Phone	Calls
Freemium Free standard version, with a paid Pro version and branding options for businesses.	Free Free and open source under the GPL-3.0-or-later.
Windows, macOS, Linux, Android, iOS	Linux
Works with any SIP PBX Native packages for many Linux distributions plus Windows and macOS	Handles both cellular and SIP calls Integrates with the GNOME desktop
Proprietary software Needs a SIP account or PBX to be useful	Linux only SIP calling needs an account with a VoIP provider
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	License: GPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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