Index: main/file.c
===================================================================
--- main/file.c	(revision 66997)
+++ main/file.c	(working copy)
@@ -1093,8 +1093,13 @@
 
 int ast_waitstream_full(struct ast_channel *c, const char *breakon, int audiofd, int cmdfd)
 {
-	return waitstream_core(c, breakon, NULL, NULL, 0,
-		audiofd, cmdfd, NULL /* no context */);
+	if (audiofd > -1 && cmdfd > -1) {
+		return waitstream_core(c, breakon, NULL, NULL, 0,
+			audiofd, cmdfd, NULL /* no context */);
+	} else {
+		return waitstream_core(c, breakon, NULL, NULL, 0,
+			-1, -1, NULL /* no context */);
+	}
 }
 
 int ast_waitstream_exten(struct ast_channel *c, const char *context)