diff --git a/libs/ysig/isup.cpp b/libs/ysig/isup.cpp
index aabf6ca7..102ab827 100644
--- a/libs/ysig/isup.cpp
+++ b/libs/ysig/isup.cpp
@@ -3816,32 +3816,33 @@ bool SS7ISUP::control(NamedList& params)
 // Process a notification generated by the attached network layer
 void SS7ISUP::notify(SS7Layer3* link, int sls)
 {
-    if (!link)
+    if (!(link && network()))
 	return;
     Lock mylock(this);
-    // Ignore links not routing our remote point code
-    if (!m_remotePoint)
-	return;
-    if ((unsigned int)-1 == link->getRoutePriority(m_type,m_remotePoint->pack(m_type)))
-	return;
+    SS7Route::State state = m_remotePoint ?
+	network()->getRouteState(m_type,*m_remotePoint) : SS7Route::Unknown;
     bool linkTmp = m_l3LinkUp;
+    bool partAvail = m_userPartAvail;
     // Copy linkset operational state
-    m_l3LinkUp = link->operational();
+    m_l3LinkUp = network()->operational();
     // Reset remote user part's availability state if supported
     // Force UPT re-send
-    if (m_uptTimer.interval() && !m_l3LinkUp) {
+    if (m_uptTimer.interval() && (!m_l3LinkUp || (SS7Route::Prohibited == state))) {
 	m_uptTimer.stop();
 	m_userPartAvail = false;
     }
     Debug(this,DebugInfo,
-	"L3 (%p,'%s') is %soperational sls=%d. Remote User Part is %savailable",
-	link,link->toString().safe(),
-	(m_l3LinkUp ? "" : "not "),sls,
+	"L3 '%s' sls=%d is %soperational.%s Route is %s. Remote User Part is %savailable",
+	link->toString().safe(),sls,
+	(link->operational() ? "" : "not "),
+	(network() == link ? "" : (m_l3LinkUp ? " L3 is up." : " L3 is down.")),
+	SS7Route::stateName(state),
 	(m_userPartAvail ? "" : "un"));
-    if (linkTmp != m_l3LinkUp) {
+    if (linkTmp != m_l3LinkUp || partAvail != m_userPartAvail) {
 	NamedList params("");
 	params.addParam("type","trunk");
 	params.addParam("operational",String::boolText(m_l3LinkUp));
+	params.addParam("available",String::boolText(m_userPartAvail));
 	params.addParam("from",link->toString());
 	engine()->notify(this,params);
     }