ShoreTel - Cloud phone system & contact center software & services
Mitel - Business Communications and Collaboration
CorvisaOne - CorvisaOne is another cloud-based communications suite that is specially designed for companies that need features for managing inbound or outbound call centres.
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
8x8 X Series - X Series connects teams across channels and around the globe, giving you access your most critical information securely, from any location.
XO Hosted PBX - Hosted PBX is a scalable UC solution that uses cloud technology to integrate HD voice & data services, mobility, along with advanced calling