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tSIP vs MicroSIP: catalog facts
tSIP	MicroSIP
Free Free and open source under the BSD 3-Clause licence.	Free Free and open source under the GPL v2.
Windows	Windows
Portable and small, with JSON settings Programmable buttons and BLF like a bench phone	Small and light on system resources Works with standard SIP providers and PBX systems
Windows only Basic version has no video support	Windows only; other desktops need Wine No mobile apps
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: GPL-2.0
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 2, 2026	Official website Full listing and sources Checked September 23, 2026

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