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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...

Virtual phone number. Voicemail, toll free numbers, local numbers, call forwarding, and voicemail to email. Six month free trial of eVoice.

Get your 800 numbers, toll free numbers, virtual pbx, internet fax and virtual phone system setup online in minutes with Ring Central, the industry leader in hosted business phone services.

8x8, Inc. (Packet8) offers VoIP business phone service to small and medium sized business.

Virtual PBX small business phone system: The hosted PBX with Fortune 500 features and low up-front costs now offers business VoIP

IP PBX phone systems from FortiVoice help small businesses improve image, control costs and stay connected anywhere. Our affordable, scalable telephone systems fit 1 to 400 users per location, FortiVoice PBX and IP PBX telephone systems are VoIP-ena...

Full Featured Business Phone Solutions, Voicemail Transcriptions, Cloud Phone System, Unlimited Local and Long Distance and More.

Computer Glossary, Computer Terms – Technology Definitions and Cheat Sheets from Whatis.com – The Tech Dictionary and IT Encyclopedia

Business VoIP phone systems, PBX SIP trunking and online fax services by NEXTIVA. A SIP-based hosted PBX small business VoIP provider for offices of all sizes.

Cisco (NASDAQ: CSCO) is the worldwide leader in networking that transforms how people connect, communicate and collaborate.

ShoreTel Sky provides hosted VoIP phone systems and applications with an experience that businesses love.