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
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.
Dialpad
Switch is a cloud-based phone system built for Google Apps users.
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.
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.
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.
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.
freepbx
FreePBX is a web-based open source GUI that controls and manages Asterisk (PBX).