diff --git a/msc_tests/BSC_ConnectionHandler.ttcn b/msc_tests/BSC_ConnectionHandler.ttcn
index 843197e..97c02b8 100644
--- a/msc_tests/BSC_ConnectionHandler.ttcn
+++ b/msc_tests/BSC_ConnectionHandler.ttcn
@@ -62,11 +62,11 @@
 }
 
 /* init function, called as first function in new BSC_ConnHdlr */
-function f_init_handler(BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
+function f_init_handler(BSC_ConnHdlrPars pars, float t_guard := 60.0) runs on BSC_ConnHdlr {
 	/* make parameters available via component variable */
 	g_pars := pars;
 	/* Start guard timer and activate it as default */
-	g_Tguard.start;
+	g_Tguard.start(t_guard);
 	activate(as_Tguard());
 }
 
diff --git a/msc_tests/MSC_Tests.ttcn b/msc_tests/MSC_Tests.ttcn
index 2f85ab4..2e9176f 100644
--- a/msc_tests/MSC_Tests.ttcn
+++ b/msc_tests/MSC_Tests.ttcn
@@ -1406,7 +1406,7 @@
 
 /* Test MT Call T310 timer */
 private function f_tc_mt_t310(charstring id, BSC_ConnHdlrPars pars) runs on BSC_ConnHdlr {
-	f_init_handler(pars);
+	f_init_handler(pars, 200.0);
 	var CallParameters cpars := valueof(t_CallParams('123456'H, 0));
 	var MNCC_PDU mncc;
 	var MgcpCommand mgcp_cmd;