A system and method to provide voice enhancement circuits on a voice path on an individual basis, without having in-line circuits inserted into the lines or trunks. The enhancement circuit is inserted within one or more of the switches. This system comprises a switching system having a switching fabric...http://www.google.fr/patents/US5521919?utm_source=gb-gplus-shareBrevet US5521919 - Method and apparatus for providing switch-based features
Method and apparatus for providing switch-based features
