--- drivers/dahdi/wcb4xxp/base.c	2016-09-21 20:55:56.000000000 +0200
+++ drivers/dahdi/wcb4xxp/base.c	2017-08-22 11:38:04.503915133 +0200
@@ -85,6 +85,7 @@
 
 static int debug = 0;
 static int spanfilter = 0xFF; /* Bitmap for ports 1-8 */
+static int te_nt_override = 0xFFFF;
 #ifdef LOOPBACK_SUPPORTED
 static int loopback = 0;
 #endif
@@ -1887,7 +1888,9 @@
 		 * jumper is the oposite of how other HFC-4S cards do:
 		 * - In B410P: GPIO=0: NT
 		 * - In Junghanns: GPIO=0: TE
+         * - Set NT/TE mode manually if software can't determine jumper position
 		 */
+if (te_nt_override == 0xFFFF) {
 		if (IS_B410P(b4)) {
 			nt = ((gpio & (1 << (i + 4))) == 0);
 		} else if (IS_GEN2(b4)) {
@@ -1907,12 +1910,15 @@
 		} else {
 			nt = ((gpio & (1 << (i + 4))) != 0);
 		}
-
-		s->te_mode = !nt;
-
 		dev_info(&b4->pdev->dev,
 			 "Port %d: %s mode\n", i + 1, (nt ? "NT" : "TE"));
-
+} else {
+        nt = !((te_nt_override >> i) & 1);
+        dev_info(&b4->pdev->dev,
+                 "Port %d: %s mode manually set\n",
+                 i + 1, (nt ? "NT" : "TE"));
+}
+		s->te_mode = !nt;
 	}
 }
 
@@ -3728,6 +3734,7 @@
 module_param(vpmsupport, int, S_IRUGO);
 module_param(timer_1_ms, int, S_IRUGO | S_IWUSR);
 module_param(timer_3_ms, int, S_IRUGO | S_IWUSR);
+module_param(te_nt_override, int, S_IRUGO | S_IWUSR);
 module_param(companding, charp, S_IRUGO);
 module_param(persistentlayer1, int, S_IRUGO | S_IWUSR);
 
@@ -3743,6 +3750,7 @@
 MODULE_PARM_DESC(vpmsupport, "1=enable hardware EC, 0=disable hardware EC");
 MODULE_PARM_DESC(timer_1_ms, "NT: msec to wait for link activation, TE: unused.");
 MODULE_PARM_DESC(timer_3_ms, "TE: msec to wait for link activation, NT: unused.");
+MODULE_PARM_DESC(te_nt_override, "TE/NT mode override bitmap for spans. 1 - TE, 0 - NT");
 MODULE_PARM_DESC(companding, "Change the companding to \"alaw\" or \"ulaw\""\
 				"(alaw by default)");