Asterisk

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

20 Alternatives To Asterisk

3CX

Hosted PBX with CRM integration and mobile apps
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3CX Phone System

3CXPhone is a free VoIP phone available for Windows, iPhone or any Android based smart phone such…
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8x8 Virtual Office

Use your iPhone, iPad or iPod touch to make and receive calls using your 8x8 Virtual Office phone…
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Bitrix24

Bitrix24 is a free (for small businesses) social enterprise platform. It is a united work space which handles the many aspects of daily operations and tasks. Create your own social intranet in minutes!

CallHub

Predictive Call Center, Voice and Text Broadcasting app

CallRail

Call tracking, recording, and analytics.
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Cloud Telephony

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

Convoso

Convoso’s Cloud Contact Center helps SMBs increase sales, marketing and customer service success.
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Dialpad

Switch is a cloud-based phone system built for Google Apps users.
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Freshcaller

The call center software for startups and small teams. No need to invest in phone hardware for your call center. Product of Freshworks Inc.
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Grasshopper

Grasshopper enables entrepreneurs to build a virtual office that connects callers to employees, wherever they are.

JustCall

JustCall is a program that allows companies to use a cloud based call service with several important features that make the program perfectly suited for sales teams as well as support teams.

Kamailio

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

MightyCall

Virtual phone system that lets you run your business from anywhere.

Nextiva

Business VoIP, cloud phone systems trusted by more than 150,000 companies. Powered by the leading cloud PBX VoIP platform, Nextiva is rated the best business VoIP service provider.

RingCentral

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

VirtualPBX

VirtualPBX provides hosted VoIP PBX phone services that give small and medium growing businesses a professional, fully automated call answering and routing solution
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VoIPstudio

VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.

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).