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Jami vs Smart-SIP-Phone: catalog facts
Jami	Smart-SIP-Phone
Free Free software under the GPLv3 or later. A GNU project with no paid tier.	Freemium Free standard version, with a paid Pro version and branding options for businesses.
Windows, macOS, Linux, Android	Windows, macOS, Linux, Android, iOS
Completely peer to peer, with no server relaying data between users No phone number or email needed to create an account	Works with any SIP PBX Native packages for many Linux distributions plus Windows and macOS
Peer-to-peer delivery means messages to an offline device wait until it reconnects Connection reliability varies more than with a server-relayed service	Proprietary software Needs a SIP account or PBX to be useful
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License: Proprietary
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

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