Question: What is Voice over IP (VoIP)?
Voice over Internel Protocol (VoIP) protocol provides alternative way for you to place phone call over IP based network or Internet instead of traditional PABX phone system. It’s cheaper to make long distance phone call this way if you compare to traditional way. When you talk by using VoIP phone, the analog data (voice) will be converted to digital data and transmitted over the Internet to the recipient.
As an example, Skype is a very popular VoIP software that let you to place call to other Skype user or phones over Internet. You can also check more VoIP provider info here in order to know more on VoIP service.