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..."D" tone in particular is important, because the Toshiba's analog extension cards don't do any other form of disconnect supervision. To detect the "D" tone (and semi-mute the "A" tone), I set up two features in features.conf. toshibahangup => D,self,Hangup toshibaanswer => A,peer/callee,Noop One thing I discovered was that the "toshibahangup" feature, when enabled, would only work for typical calls that were bridged. They would not work for things like voicemail. The voip-info wiki suggests using a meetme conference that listens for "D"...