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Tandem coding (also called transcoding) refers to the conversion of a voice signal from analog to digital and back again. When calls are routed over multiple IP facilities, they may be subject to multiple transcodings. The multiple conversions between analog and digital coding result in a deterioration in the voice quality. Tandem coding should be avoided wherever possible in any compressed voice system (for example, by minimizing analog trunking on the PBX).
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