diff --git a/library/Osmocom_VTY_Functions.ttcn b/library/Osmocom_VTY_Functions.ttcn
index 823d79f..4cf37c4 100644
--- a/library/Osmocom_VTY_Functions.ttcn
+++ b/library/Osmocom_VTY_Functions.ttcn
@@ -56,7 +56,7 @@
 	}
 
 	/* wait for any of the permitted prompts; buffer + return all intermediate output */
-	function f_vty_wait_for_prompt(TELNETasp_PT pt) return charstring {
+	function f_vty_wait_for_prompt(TELNETasp_PT pt, boolean strict := true) return charstring {
 		var charstring rx, buf := "";
 		var integer fd;
 		timer T := 2.0;
@@ -67,7 +67,11 @@
 			[] pt.receive(pattern "[\w-]+\# ") { };
 			[] pt.receive(pattern "[\w-]+\(*\)\# ") { };
 			[] pt.receive(t_vty_unknown) {
-				testcase.stop(fail, "VTY: Unknown Command");
+				if (strict) {
+					testcase.stop(fail, "VTY: Unknown Command");
+				} else {
+					log("VTY: Unknown Command (ignored)");
+				}
 				};
 			[] pt.receive(charstring:?) -> value rx { buf := buf & rx; repeat };
 			[] pt.receive(integer:?) -> value fd {
@@ -88,14 +92,14 @@
 	}
 
 	/* send a VTY command and obtain response until prompt is received */
-	function f_vty_transceive_ret(TELNETasp_PT pt, charstring tx) return charstring {
+	function f_vty_transceive_ret(TELNETasp_PT pt, charstring tx, boolean strict := true) return charstring {
 		pt.send(tx);
-		return f_vty_wait_for_prompt(pt);
+		return f_vty_wait_for_prompt(pt, strict);
 	}
 
 	/* send a VTY command and obtain response until prompt is received */
-	function f_vty_transceive(TELNETasp_PT pt, charstring tx) {
-		var charstring unused := f_vty_transceive_ret(pt, tx);
+	function f_vty_transceive(TELNETasp_PT pt, charstring tx, boolean strict := true) {
+		var charstring unused := f_vty_transceive_ret(pt, tx, strict);
 	}
 
 	type integer BtsNr (0..255);