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When a voice signal is converted from analog to digital or from digital to analog, with or without compression and decompression, transcoding results in a certain degradation of quality. If calls are routed through multiple voice coders, as in the case of calls on an intermediate system routed back to a central voice mail system, they may go through multiple transcodings with an audible loss of quality.
Multiple transcoding problems may be minimized by the use of a DEFINITY� ECS feature, DCS with Rerouting (Path Replacement). This feature detects that the call coming through the main ECS has been routed from a tandem ECS, through the main, and back out to a third switch. The system then re-routes the call directly to avoid extra transcoding. Avaya products minimize transcoding, while non-Avaya products may cause slight to excessive transcoding.
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