diff --git a/drivers/isdn/i4l/isdn_tty.c b/drivers/isdn/i4l/isdn_tty.c
index 4e5f87c1e71413bb3d15d65e5edf3ae011746b20..24679a3f5596659d7618b3d4c115604c7bb576a1 100644
--- a/drivers/isdn/i4l/isdn_tty.c
+++ b/drivers/isdn/i4l/isdn_tty.c
@@ -2645,7 +2645,12 @@ isdn_tty_modem_result(int code, modem_info * info)
 		if ((info->flags & ISDN_ASYNC_CLOSING) || (!info->tty)) {
 			return;
 		}
+#ifdef CONFIG_ISDN_AUDIO
+		if ( !info->vonline )
+			tty_ldisc_flush(info->tty);
+#else
 		tty_ldisc_flush(info->tty);
+#endif
 		if ((info->flags & ISDN_ASYNC_CHECK_CD) &&
 		    (!((info->flags & ISDN_ASYNC_CALLOUT_ACTIVE) &&
 		       (info->flags & ISDN_ASYNC_CALLOUT_NOHUP)))) {