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#2 Google Voice
Free US‑based phone number with unlimited domestic calls, voicemail transcription, and integration with Google Workspace.
#3 TextNow
Ad‑supported free phone number for unlimited US/Canada calls and texts via its mobile and desktop apps.
#4 Linphone
Open‑source SIP softphone for Windows, macOS, Linux, iOS, and Android with audio/video calls and encryption.
Cross‑platform SIP/VoIP softphone offering basic calling features without a paid license.
#6 Jitsi Meet
Free, open‑source video‑conferencing platform that also supports high‑quality VoIP audio calls without registration.
Free version of the 3CX PBX for up to 16 simultaneous calls, includes web‑based softphone and mobile apps.
#8 FreePBX
Open‑source GUI for Asterisk PBX, enabling free SIP trunking, call routing, and voicemail on your own server.
#9 Asterisk
Industry‑standard open‑source telephony engine; you can build a completely free VoIP system on your own hardware.
#10 FusionPBX
Free, multi‑tenant PBX built on FreeSWITCH, offering SIP trunking, call routing, and web‑based management.
#11 OpenSIPS
Open‑source SIP server for building scalable VoIP platforms; free to download and self‑host.
#12 Kamailio
High‑performance open‑source SIP proxy/router, ideal for large‑scale free VoIP deployments.
#13 Sipdroid
Android SIP client that lets you register with any SIP provider and make free VoIP calls over Wi‑Fi or data.
#14 Viber
Free messaging app with unlimited VoIP calls to other Viber users and low‑cost calls to regular phones.
#15 WhatsApp
Popular messaging platform offering free voice (and video) calls between WhatsApp accounts worldwide.
#16 Signal
Privacy‑focused messenger that provides encrypted free voice and video calls between Signal users.
#17 Discord
Free community platform with high‑quality voice channels for group calls and screen sharing.
#18 Telegram
Messaging app that includes free VoIP calls to other Telegram users with end‑to‑end encryption.
Free tier of Teams offering unlimited chat, audio calls, and up to 60 minute meetings for up to 100 participants.
#20 Zoom Free
Free Zoom account includes unlimited 1‑on‑1 audio/video meetings and group meetings up to 40 minutes.
#21 OnSIP Free
Free developer tier with up to 2 SIP extensions, inbound/outbound calling via SIP trunk, and web‑based softphone.