diff --git a/src/input/misdn.c b/src/input/misdn.c
index 4cefd8b..8acf4c9 100644
--- a/src/input/misdn.c
+++ b/src/input/misdn.c
@@ -206,7 +206,7 @@
 	return ret;
 }
 
-#define BCHAN_TX_GRAN	40
+#define BCHAN_TX_GRAN	160
 /* write to a B channel TS */
 static int handle_tsX_write(struct bsc_fd *bfd)
 {