The Average VoIP Packet Size
VoIP, or Voice over Internet Protocol, transmits audio over a digital network by breaking the audio into tiny segments called packets. Each packet typically carries no more than 30 milliseconds of audio to aid in smooth, error-corrected transmission.
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Factors
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VoIP technicians tend to measure packet size by the millisecond of data they possess rather than strictly by file size, which may include not only the payload, or the audio data itself, but data needed for recognition by various Internet protocols. A 20-byte audio payload, for instance, may expand to 54 bytes with this added "overhead," according to Protocols.com.
Average Size
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While audio packets may contain as little as 10 milliseconds of audio, the average packet sent in a VoIP transmission contains between 20 and 30 milliseconds, according to Packetizer. Different compression settings can reduce a large packet to a more standard size, according to Protocols.com.
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Significance
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Packetizer states that the small size of individual data packets allows error-correction systems to interpolate missing data if a few packets become garbled or omitted during the transmission. Forward-error correction, for instance, duplicates data from the previous packet to cover the missing packet.
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