let multitone support unitone

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4685 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/libteletone/src/libteletone_detect.c

@@ -217,7 +217,7 @@ int teletone_multi_tone_detect (teletone_multi_tone_t *mt,
 			gtest += teletone_goertzel_result (&mt->gs2[x]) < eng_all[x] ? 1 : 0;
 		}
 
-		if (gtest >= 2 && eng_sum > 42.0 * mt->energy) {
+		if ((gtest >= 2 || gtest == mt->tone_count) && eng_sum > 42.0 * mt->energy) {
 			if(mt->negatives) {
 				mt->negatives--;
 			}