1 files changed, 9 insertions, 4 deletions
diff --git a/zaptel.c b/zaptel.c
index 9abe625..48909a8 100755
--- a/zaptel.c
+++ b/zaptel.c
@@ -4970,10 +4970,15 @@ out in the later versions, and is put back now. */
 			}
 			bytes = 0;
 		} else if (ms->flags & ZT_FLAG_CLEAR) {
-			/* Clear channels should idle with 0xff for the sake
-			of silly PRI's that care about idle B channels */
-			memset(txb, 0xff, bytes);
-			bytes = 0;
+			/* Clear channels that are idle in audio mode need
+			   to send silence; in non-audio mode, always send 0xff
+			   so stupid switches won't consider the channel active
+			*/
+			if (ms->flags & ZT_FLAG_AUDIO) {
+				memset(txb, ZT_LIN2X(0, ms), bytes);
+			} else {
+				memset(txb, 0xff, bytes);
+			}
 		} else {
 			memset(txb, ZT_LIN2X(0, ms), bytes);	/* Lastly we use silence on telephony channels */
 			bytes = 0;