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Asterisk

Free
Asterisk is an open-source software program that lets users develop their own communications systems. The software includes built-in tools that allow individuals to create custom applications
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CloudTalk

Paid
Are you tired of boring call center software? Try CloudTalk. io, a new-generation cloud phone system for small and medium businesses. 25+ integrations with most of your favorite CRMs and tools
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Google Hangouts

Similar to a social media page, you can call people and send messages from your mobile device.
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Google Voice

Free
Google Voice is a service that offers many features to your existing phones. This service is mostly used to provide a single phone number that allows people to reach you on all of your devices.
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Line2

Paid
Line2 is an inexpensive and convenient service that lets business owners and the self-employed set up a second line for their office easily.
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OfficeSuite

Freemium
A pioneer in multi-device, cross-platform mobile app development since 2001.
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Phone.com

Affordable VOIP business phone service, toll free numbers and virtual pbx features starting under $10/month. View online or call 1-800-998-7087. Try our business voip service free.
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Telzio

Paid
Cloud phone systems to power business voice, SMS, and fax services. Online software for business VoIP solutions.
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Voxeet

Free
Build the best user experience possible with the clearest audio with Voxeet voice and video chat SDK, live voice call API. Boost your user engagement.
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