Voice over Internet Protocol communications in which voice calls, video and data are transmitted over the Internet, instead of the old traditional telephone line. You can get advanced HD quality voice, video conferencing, voice to Email, presence tracing, CRM integration, mobile-first technology, free world roaming and more. The SIP accounts have no surprises in your monthly bill. Your people and partners can be more productive, work faster and smarter with their favorite business apps and enjoy the same experience no matter how they are connected.