diff --git a/Control/TransactionTable.cpp b/Control/TransactionTable.cpp
index 9a6e4d8..d7a6453 100644
--- a/Control/TransactionTable.cpp
+++ b/Control/TransactionTable.cpp
@@ -1109,6 +1109,9 @@ bool TransactionTable::isBusy(const L3MobileIdentity& mobileID)
 			itr->second->GSMState() == GSM::CallReceived ||
 			itr->second->GSMState() == GSM::CallPresent ||
 			itr->second->GSMState() == GSM::ConnectIndication ||
+			itr->second->GSMState() == GSM::HandoverInbound ||
+			itr->second->GSMState() == GSM::HandoverProgress ||
+			itr->second->GSMState() == GSM::HandoverOutbound ||
 			itr->second->GSMState() == GSM::Active;
 		if (inCall) return true;
 	}
diff --git a/GSM/GSMCommon.cpp b/GSM/GSMCommon.cpp
index 4e40a1a..6b45e2a 100644
--- a/GSM/GSMCommon.cpp
+++ b/GSM/GSMCommon.cpp
@@ -47,6 +47,7 @@ const char* GSM::CallStateString(GSM::CallState state)
 		case ReleaseRequest: return "release-request";
 		case SMSDelivering: return "SMS-delivery";
 		case SMSSubmitting: return "SMS-submission";
+		case BusyReject: return "Busy Reject";
 		default: return NULL;
 	}
 }
diff --git a/GSM/GSMCommon.h b/GSM/GSMCommon.h
index a0f41eb..164319d 100644
--- a/GSM/GSMCommon.h
+++ b/GSM/GSMCommon.h
@@ -68,6 +68,10 @@ enum CallState {
 	ReleaseRequest,
 	SMSDelivering,
 	SMSSubmitting,
+	HandoverInbound,
+	HandoverProgress,
+	HandoverOutbound,
+	BusyReject,
 };
 
 
@@ -78,6 +82,7 @@ std::ostream& operator<<(std::ostream& os, CallState state);
 
 
 /** A base class for GSM exceptions. */
+
 class GSMError {};
 
 /** Duration ofa GSM frame, in microseconds. */