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CALLR

Paid
CALLR is an extremely helpful app for those who have to deal with call control protocols for their business. You can create a customized call control system that will perform a wide range of functions.
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FreeConference

FreeConference.com offers free conference call solutions for you to connect through telephone or online with your customers, relatives or colleagues anywhere.
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Grasshopper

Free
Grasshopper lets even small businesses develop a telephone dispatch system that can provide them with the tools they need to look professional and engage their customers more effectively.
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LINE

Freemium
LINE is a new communication app which allows you to make FREE voice calls and send FREE messages whenever and wherever you are, 24 hours a day!
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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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Linphone

Free
Linphone is an open source SIP client for HD voice/video calls, 1-to-1 and group instant messaging, conference calls etc. Available for iOS, Android, Windows, macOS and GNU/Linux.
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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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Zoiper

Freemium
Zoiper, the free softphone to make VoIP calls through your PBX or favorite SIP provider. Available for iPhone, Android, Windows Phone 8, Windows, Mac and Linux.
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