Index: main/dsp.c
===================================================================
--- main/dsp.c	(revision 227049)
+++ main/dsp.c	(working copy)
@@ -1363,6 +1363,9 @@
 				memmove(dsp->digit_state.digits, dsp->digit_state.digits + 1, dsp->digit_state.current_digits);
 				dsp->digit_state.current_digits--;
 				dsp->dtmf_began = 0;
+				/* Reset Busy Detector */ 
+			        memset(dsp->historicsilence, 0, sizeof(dsp->historicsilence));
+				memset(dsp->historicnoise, 0, sizeof(dsp->historicnoise));
 			}
 
 			if (event) {