diff --git a/library/L3_Templates.ttcn b/library/L3_Templates.ttcn
index 5acd2bf..2fb6416 100644
--- a/library/L3_Templates.ttcn
+++ b/library/L3_Templates.ttcn
@@ -1790,6 +1790,10 @@
 const BIT3 c_GMM_DTT_MO_IMSI := '010'B;
 const BIT3 c_GMM_DTT_MO_GPRS_IMSI_COMBINED := '011'B;
 
+const BIT3 c_GMM_DTT_MT_REATTACH_REQUIRED := '001'B;
+const BIT3 c_GMM_DTT_MT_REATTACH_NOT_REQUIRED := '010'B;
+const BIT3 c_GMM_DTT_MT_IMSI_DETACH := '011'B;
+
 template (value) DetachTypeV ts_GMM_DetType(BIT3 dtt, boolean power_off := false) := {
 	detachType := dtt,
 	powerOffFlag := bool2bit(power_off)