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Sudo is a VoIP software for making voice and video calls over the internet. It lets users make international and long-distance calls at more affordable rates than traditional phone systems. Sudo supports features such as call recording, call transfer, voicemail to email transcription, auto-attendant (IVR), conference calling, toll-free numbers, and number porting. The platform is often used in business environments but can also serve individual consumers looking for an alternative to traditional phone services.