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Voice Over Internet Protocol (VoIP) packet loss occurs when heavy network traffic creates dropped packets, causing portions of conversations to be lost.
VoIP network packets may use different data exchange routes prior to arriving at the destination. However, packets frequently experience delays, or do not arrive at receiving terminals, because fully buffered servers do not have sufficient packet capacity.
Most service providers guarantee a one-half percent packet loss or lower. A one percent packet loss equals one voice clip every three minutes. A one-quarter percent packet loss equals one error every 53 minutes.
Packet loss concealment (PLC) methods are essential because traditional error-control methods, such as automatic repeat request (ARQ), are ineffective. PLC uses different techniques to mask lost packets, including zero insertion (replacing lost data with zeros) and waveform substitution (replacing lost data with previously received data).