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On‑premise PBX with a web‑based console, support for up to 8 concurrent calls, mobile apps, and CRM integration.
#3 Asterisk
Open‑source telephony engine that lets you build a custom PBX, IVR, and call‑center solution.
#4 FreePBX
Graphical front‑end for Asterisk, offering drag‑and‑drop configuration of extensions, voicemail, and call routing.
#5 FusionPBX
Multi‑tenant, open‑source PBX built on FreeSWITCH; includes web UI, call queues, and SIP trunking.
#6 Elastix
All‑in‑one communications suite (now based on 3CX) that bundles PBX, email, chat, and fax.
#7 Linphone
Free SIP softphone for desktop and mobile with HD audio, video calls, and end‑to‑end encryption.
#8 Jitsi Meet
Self‑hosted, open‑source video‑conferencing platform that also supports SIP dial‑in/out for voice calls.
Cross‑platform SIP softphone with call recording, presence, and TLS/SRTP security.
#10 MicroSIP
Lightweight Windows SIP client focused on high‑quality audio and low latency.
#11 Sipgate Free
German‑based SIP provider offering a free personal number with inbound/outbound calling to the EU.
Free U.S. phone number with voicemail, call forwarding, and integration with Google Workspace.
#13 Skype (Free)
Skype‑to‑Skype voice and video calls are free; useful for internal communication and small‑team meetings.
Free tier includes unlimited chat, video meetings, and limited voice calling (audio‑only) for up to 300 users.
#15 Discord
Community‑focused voice chat with server‑wide voice channels; can be repurposed for small‑business collaboration.
Free business account with Viber‑to‑Viber calls, chat, and basic chatbot integration.
Limited free tier that provides a single user number, unlimited internal calls, and mobile apps.
#18 Bitrix24 Free
All‑in‑one suite with free cloud PBX, up to 12 users, call routing, and CRM integration.
#19 Freshcaller Free
Free tier for up to 10 agents, includes inbound/outbound calling, call masking, and basic analytics.
#20 8x8 Free Tier
Free plan for up to 2 users with unlimited internal calls and limited PSTN minutes.
#21 Zoho Cliq (Free)
Team chat app with built‑in voice calls for up to 100 users; integrates with Zoho suite.
#22 Nextcloud Talk
Self‑hosted video/voice chat app that works with any Nextcloud installation; supports SIP integration.
Open‑source team communication platform with optional voice call plugin and WebRTC support.
#24 Mattermost Calls
Open‑source Slack alternative; voice calling available via the built‑in Calls plugin.
#25 Mumble
Low‑latency, open‑source voice chat server often used by gaming teams but suitable for small business meetings.
#26 Signal
End‑to‑end encrypted voice (and video) calls; free on mobile and desktop, ideal for privacy‑focused teams.
Secure, free voice calls between Telegram users; can be used for informal business conversations.
Free voice calls between WhatsApp Business accounts; integrates with catalog and quick replies.
Open‑source telephony framework that can act as a PBX, VoIP gateway, or softswitch.
#30 Kamailio
High‑performance SIP server for large‑scale VoIP deployments; free and open source.
#31 OpenSIPS
Robust open‑source SIP proxy with advanced routing, load‑balancing, and NAT traversal features.