Index: dsp.c
===================================================================
RCS file: /usr/cvsroot/asterisk/dsp.c,v
retrieving revision 1.29
diff -u -r1.29 dsp.c
--- dsp.c	19 Aug 2004 18:52:56 -0000	1.29
+++ dsp.c	30 Aug 2004 06:54:37 -0000
@@ -1233,9 +1233,11 @@
 		return 0;
 	
 	accum = 0;
-	for (x=0;x<len; x++) 
-		accum += abs(s[x]);
-	accum /= len;
+	if (len > 0) {
+		for (x=0;x<len; x++) 
+			accum += abs(s[x]);
+		accum /= len;
+	}
 	if (accum < dsp->threshold) {
 		dsp->totalsilence += len/8;
 		if (dsp->totalnoise) {