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Top Competitors to Consider
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#2 Jitsi Meet
Web‑based, open‑source video‑conferencing platform with SIP integration and end‑to‑end encryption.
#3 Jami
Decentralised, peer‑to‑peer communication app offering voice, video, and messaging without a central server.
#4 Mumble
Low‑latency, open‑source voice chat primarily for gamers, supporting encrypted SIP bridges.
#5 MicroSIP
Lightweight Windows SIP softphone supporting HD audio, video calls, and multiple accounts.
Free version of the 3CX softphone offering SIP calling, video, and instant messaging on Windows, macOS, and Linux.
Cross‑platform SIP client with a modern UI, supporting audio/video calls, presence, and multiple accounts.
Popular multi‑platform SIP client with a free tier, offering HD voice, video, and encryption.
#9 Ekiga
Open‑source VoIP and video conferencing application for Linux and Windows, supporting SIP and H.323.
#10 CSipSimple
Android SIP client that integrates with the native dialer, supporting multiple accounts and codecs.
#11 Sipdroid
Free Android SIP client that works as a regular phone app, offering call recording and encryption.
#12 Grandstream Wave
Android and iOS softphone from Grandstream, supporting SIP, video, and push‑to‑talk features.
Formerly Ring, an open‑source SIP client for Linux, macOS, and Windows, now merged into Jami.
The original open‑source SIP client that evolved into Jitsi, still usable for basic SIP calls.
#15 FreeSWITCH
Scalable open‑source telephony platform that can act as a softphone gateway, PBX, or media server.
#16 Asterisk
Industry‑standard open‑source PBX that provides SIP calling, voicemail, conferencing, and more.
#17 OpenSIPS
High‑performance SIP server for routing, load‑balancing, and NAT traversal in large VoIP deployments.
#18 Kamailio
Robust open‑source SIP proxy server designed for carrier‑grade VoIP services.
#19 SipXcom
Full‑featured open‑source unified communications suite (PBX, voicemail, conferencing) built on SIP.
#20 FusionPBX
Web‑based open‑source GUI for FreeSWITCH, offering multi‑tenant PBX features and SIP trunking.
#21 Wazo
Open‑source communication platform providing a PBX, VoIP gateway, and API‑driven telephony services.