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RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Twilio - Brings voice and messaging to your web and mobile applications.
Dialpad - Switch is a cloud-based phone system built for Google Apps users.
Plivo - Plivo simplifies your customer engagement.
Nexys Mobile - Mobile Phone plans and Services for highly mobile small business workers and entrepreneurs who run their lives from their phone.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates