Grandstream Wave is a popular soft‑phone for SIP‑based calling. Below are 20 free (or freemium) VoIP/SIP client alternatives that you can use on desktop or mobile platforms.
Get targeted exposure with custom position pinning and highlighted placement.
Cross‑platform SIP softphone with a clean UI, audio/video calls, and support for multiple accounts.
Open‑source SIP client for Windows, macOS, Linux, Android and iOS with voice, video, and instant messaging.
Free, open‑source video‑conferencing and SIP softphone that runs on Windows, macOS, Linux and browsers.
Lightweight Windows SIP client focused on high‑quality audio, with support for multiple codecs.
Free softphone for Windows, macOS, iOS and Android that works with the 3CX PBX and any standard SIP server.
Open‑source VoIP and video conferencing application for Linux and Windows, supporting SIP and H.323.
Formerly X‑Lite, now Bria Solo Free – a basic SIP softphone for Windows and macOS with call handling features.
Simple Windows SIP client with a focus on ease‑of‑use, supporting audio, video, and presence.
Open‑source SIP client for Linux, Windows and macOS offering voice, video, and instant messaging.
Free, open‑source SIP softphone for Linux, Windows, macOS, Android and iOS with encrypted calls.
Free SIP softphone from CounterPath for Windows, macOS, Linux, iOS and Android with HD audio.
Android SIP client that integrates with the native dialer, offering call logs and contact sync.
iOS and Android SIP client with a free tier that includes basic calling and push‑notifications.
Native macOS SIP client with a minimalist design, supporting multiple accounts and Touch ID.
Open‑source telephony platform that includes a softphone module for SIP calling on Linux.
While primarily a VoIP gaming chat, Mumble can be linked to SIP via external bridges for free voice communication.
The original Jitsi SIP client, still available as a lightweight desktop softphone.
Web‑based SIP client that runs in any modern browser, offering free calling through a FreePBX server.
Dedicated desktop version of Linphone with advanced settings, screen sharing, and conference support.