Packet loss concealment (PLC) is a technique to mask the effects of packet loss in VoIP communications. Because the voice signal is sent as packets on a VoIP network, they may travel different routes to get to destination. At the receiver a packet might arrive very late, corrupted or simply might not arrive. One of the cases in which the last situation could happen is where a packet is rejected by a server which has a full buffer and cannot accept any more data. In a VoIP connection, error-control techniques such as ARQ are not feasible and the receiver should be able to cope with packet loss.
Contents
PLC techniques
Use
PLC is used with the codecs iLBC and SILK in Skype, in Jitsi with the SILK and Opus codecs, and in the pjsip stack used by CSipSimple.
References
Packet loss concealment Wikipedia(Text) CC BY-SA