What is VoIP: VoIP is the method by which analog audio signals are converted to digital format and transmitted over the internet. It is also referred to as IP telephony, internet telephony, digital phone or broadband phone. Calls can be made using any of the following methods with a high speed internet or broadband connection:
howstuffworks: How VoIP Works
Choose Your VoIP: VoIP Glossary
Instructional Uses of VoIP and Audio Conferencing: Audio conferencing using VoIP has the capability of reaching out to large groups in various locations for meetings or educational purposes. It can be used as a cost effective instructional strategy for presenting material suitable for auditory learning, that is, material that doesn’t require a visual demonstration by either the facilitator or the participant.
Today audio conferencing is increasingly becoming a component of web conferencing services.
Advantages and Disadvantages of Audio Conferencing: