Kamailio

Kamailio® (successor of former OpenSER and SER) is an open source SIP server released under…

17 Alternatives To Kamailio

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3CX Phone System

3CXPhone is a free VoIP phone available for Windows, iPhone or any Android based smart phone such…

Asterisk

An open source telephony switching and private branch exchange service for Linux.
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AsteriskNOW

AsteriskNOW is the fastest way to get started building custom telephony solutions with Asterisk.
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Cloud Telephony

Cloud Telephony delivers automated telephone applications to any phone, any place, anytime.
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Dialpad

Switch is a cloud-based phone system built for Google Apps users.
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Dimelo By RingCentral

Dimelo, Unified management platform for your digital conversations
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FusionPBX

FusionPBX is an open source FreeSWITCH GUI.

Issabel

Your Open Source Solution For Unified Comunnications And More…

RingCentral

RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies

Starfish PBX

Starfish PBX aims to be an open source alternative to Digium’s Switchvox.
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The Incredible PBX

Incredible PBX is a secure and feature-rich implementation of the Asterisk® PBX.
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Twilio

Brings voice and messaging to your web and mobile applications.

VitalPBX

VitalPBX is a full-feature PBX (phone system) based on Linux and Asterisk.

VoipSwitch

VoipSwitch provides complete VoIP and unified communications solutions.

Wazo

Wazo is a unified communications platform based on Asterisk and focused on extensibility.
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freepbx

FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).

opensips

OpenSIPS (Open SIP Server) is a mature Open Source implementation of a SIP server.