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Phonebot is an open-source project built using Slack APIs, Twilio, and IBM Watson that enables users to make phone calls within Slack channels. When a user initiates a call with @phonebot, Phonebot transcribes the conversation and posts it in the channel for others to view. The system uses Twilio's telephony-as-a-service to make calls, and IBM Watson's speech-to-text service to translate audio recordings into text. Users can control the phone call by issuing commands such as dialing a number or sending text as speech. Phonebot also supports recording and replaying phone calls for later transcription. The project is deployed on the IBM Bluemix cloud platform and can be configured using environment variables and application manifests.