What is VoIP Codec?

Codecs (Coder/Decoder) serve to encode voice/video data for transmission across IP networks. The compression capability of a codec facilitates saving network bandwidth and it is therefore appropriate that you choose the correct codec for your IP network. Here is a quick reference to the codecs with the corresponding packets size and bandwidth usage:

Codec & Bit Rate (Kbps) Operation Frequency Default number of packets Voice Payload Size Bandwidth MP or FRF.12 (Kbps) Bandwidth w/cRTP MP or FRF.12 (Kbps) Bandwidth Ethernet (Kbps)
G.711a/u (64 Kbps) 60 msecs by default. You can specify in the range of 0 - 604800 msecs. 1000 160 + 12 RTP bytes 82.8 Kbps 67.6 87.2
G.729 (8 Kbps) 60 msecs by default. You can specify in the range of 0 - 604800 msecs. 1000 20 + 12 RTP bytes 26.8 Kbps 11.6 31.2
 
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