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Tandem signaling
Tandem signaling is one of the most difficult conditions for speech coders to perform well in is the case where a digital speech-coded signal is transmitted from the mobile to the base station, and then demodulated into an analog signal which is then speech coded for retransmission as a digital signal over a land line or wireless link. This situation, called tandem signaling, tends to exaggerate the bit errors originally received at the base station.
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