Packet Loss Concealment (PLC)

Packet loss concealment refers to a method of hiding the fact a media packet was lost. For example, in the case that a G.711 packet was lost, the ▲VoIP device may elect to simply replay the last packet to disguise the fact that a packet was lost, rather than allowing the user to hear silence. While that is an extremely simple technique, there are more advanced algorithms to provide packet loss concealment, with some ▲codecs (e.g., G.729) having PLC as an integral part of the design.