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Digium

Digium offers IP phones, business phone systems, such as Switchvox IP PBX, and custom communications solutions for Asterisk.

21 Alternatives To Digium

3CX

Hosted PBX with CRM integration and mobile apps

8x8 Business VoIP

8x8 business VoIP offers mobile apps, web conferencing, chat and the added benefit of a customer contact center.

Asterisk

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

CallHippo

CallHippo offers cloud-based virtual phone systems for SME businesses.

CallHub

Predictive Call Center, Voice and Text Broadcasting app
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Cloud Telephony

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

Communigate

CommuniGate Pro is a scalable carrier-grade email server, unified communications server.

CrazyCall

CrazyCall is cloud based platform for sales and marketing teams doing cold calling, market research, information or loyalty campaigns.
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Dialpad

Switch is a cloud-based phone system built for Google Apps users.
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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.
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Line2

Line2 adds a second phone number or complete cloud business phone system to smartphones & computers that’s robust yet affordable. Buy online or get a custom quote.

MightyCall

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

Nextiva Office

Nextiva Office offers cloud-based telephone system.
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OnSIP

OnSIP offers cloud phone sytem for business communications across all devices.

RingCentral

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

Truly Wireless

Wireless business phone system built for sales and support team.
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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.

Vonage Business

Business phone system.

Vonjour

Vonjour is the all in one phone system and text messaging service for businesses.
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freepbx

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