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Top Competitors to Consider
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#2 Asterisk
Open‑source telephony engine that powers PBX, VoIP gateways, and conference servers; highly extensible via dialplan scripting.
#3 FreePBX
Web‑based GUI for Asterisk that simplifies PBX configuration, voicemail, IVR, and call routing.
#4 FusionPBX
Multi‑tenant PBX built on FreeSWITCH, offering call routing, voicemail, fax, and a modern HTML5 UI.
#5 Kamailio
High‑performance SIP server designed for large‑scale deployments, handling registration, routing, and load‑balancing.
#6 OpenSIPS
Robust SIP proxy and registrar with advanced routing, NAT traversal, and real‑time analytics.
#7 Issabel
Community‑driven fork of Elastix that combines Asterisk PBX, CRM, and call‑center features.
#8 Wazo
Open‑source unified communications platform offering PBX, video, chat, and API‑first integration.
#9 FreeSWITCH
Scalable telephony platform for building soft‑switches, conference bridges, and media gateways.
#10 Linphone
Cross‑platform SIP soft‑phone with audio/video calls, instant messaging, and end‑to‑end encryption.
#11 Jitsi Meet
Open‑source video‑conferencing solution that also supports SIP audio calls without needing an account.
#12 Zoiper
Free SIP/IMS soft‑phone for Windows, macOS, Linux, iOS, and Android with HD audio and video support.
#13 SipXcom
Enterprise‑grade SIP communications suite offering PBX, voicemail, and unified messaging.
#14 Vicidial
Open‑source call‑center solution built on Asterisk, providing inbound/outbound dialing, predictive dialing, and agent tools.
#15 Callcentric
Free SIP service that supplies SIP credentials, inbound numbers, and basic call handling for testing or small deployments.
#16 Grandstream Wave
Free soft‑phone for Android and iOS that supports SIP, video calls, and push notifications.
#17 MicroSIP
Lightweight Windows SIP client focused on high‑quality audio and simple configuration.
Modular telephony engine that can act as a PBX, gateway, or media server with scripting support.
Free version of the PBXware suite offering core PBX features, voicemail, and basic call routing.
#20 Odoo VoIP
Integrated VoIP module within the Odoo ERP suite, enabling click‑to‑call, call logging, and CRM linking.
#21 Jami
Decentralized, peer‑to‑peer communication app supporting secure audio/video calls without a central server.