(VoIP), also called IP telephony, is a method and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol(IP) networks, such as the Internet
VOIP calls are similar to traditional digital telephony and involve signaling,
Transmission occurs as IP packets over a packet-switched network.
VoIP are based on the linear predictive coding
Popular codecs include the MDCT-based AAC-LD (used in FaceTime)
Voice communications and multimedia sessions over Internet Protocol(IP) network.