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Calls on Slack - Make voice calls in Slack
RingCentral - RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies
Rebel Calling - Internet-free international calling for $1 a month
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Skype for Slack - Move your slack discussions to a group skype call
Phonebooth - Phonebooth is one of the leading voip providers, providing phone systems & phone service for small businesses.