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Welcome to voip.about.com, your guide site to everything Voice Over IP, also called VoIP, IP Telephony or Internet Telephony. Learn how to make free or cheap local and international calls using your PC or phone. Stay updated on VoIP hows and whats, V...

As a leading international provider of fiber-based communications services, Level 3 Communications offers a broad service portfolio and one of the world

3CX VOIP PBX - provides an easy to use, plug and play SIP - IP PABX for Windows. With a software based IP PBX you will save on PBX maintenance and halve your phone bill. Download the FREE edition today and break free from your proprietary phone syste...

Principal operateur de VoIP utilisant le protocole SIP. Offres r?dentielle, business et call centers disponibles via un Compte SIP ou Trunk SIP multi-canaux.

Comcast Business Services offers high speed broadband internet, phone, digital cable, and ethernet data service to businesses of all sizes.

Business Grade SIP Trunking for enterprises. Save 40% or more! Flexible plans and pricing tailored to meet your exact communication needs. Get started today at nexVortex.com

AT&T Enterprise is the leading provider of enterprise networking, mobility and digital media solutions, enabling global collaboration through enterprise application management and networking services including Telepresence and cloud storage.

The Award Winning Business Phone Service over the Internet. OnSIP business VoIP service is a hosted pbx system that allows you to streamline your business communications. There’s no phone company hassle, no phone system to buy or manage, no contracts

XO Communications provides cutting edge Business Telecommunications technology. Learn more about Business Telecommunications from XO Communications.