diff --git a/modules/yiaxchan.cpp b/modules/yiaxchan.cpp
index 3581e954..39c479d1 100644
--- a/modules/yiaxchan.cpp
+++ b/modules/yiaxchan.cpp
@@ -107,7 +107,7 @@ public:
     inline int remotePort() const
 	{ return m_remotePort; }
 private:
-    void setRegistered(bool registered, const char* reason = 0);
+    void setRegistered(bool registered, const char* reason = 0, const char* error = 0);
     String m_name;
     String m_username;                  // Username
     String m_password;                  // Password
@@ -610,7 +610,7 @@ YIAXLine::~YIAXLine()
 }
 
 // Set the registered status, emits user.notify messages if necessary
-void YIAXLine::setRegistered(bool registered, const char* reason)
+void YIAXLine::setRegistered(bool registered, const char* reason, const char* error)
 {
     if ((m_registered == registered) && !reason)
 	return;
@@ -621,8 +621,8 @@ void YIAXLine::setRegistered(bool registered, const char* reason)
 	m->addParam("protocol","iax");
 	m->addParam("username",m_username);
 	m->addParam("registered",String::boolText(registered));
-	if (reason)
-	    m->addParam("reason",reason);
+	m->addParam("reason",reason,false);
+	m->addParam("error",error,false);
 	Engine::enqueue(m);
     }
 }
@@ -792,7 +792,7 @@ void YIAXLineContainer::regTerminate(IAXEvent* event)
 		line->toString().c_str(),what,tf,line->m_remoteAddr.c_str(),
 		line->m_remotePort,reason.safe());
 	clearTransaction(line);
-	line->setRegistered(ok,reason);
+	line->setRegistered(ok,reason,event->type() == IAXEvent::Reject ? "noauth" : 0);
 	remove = !line->m_register;
     }
     line->unlock();
diff --git a/modules/ysipchan.cpp b/modules/ysipchan.cpp
index a47571de..7c85d76b 100644
--- a/modules/ysipchan.cpp
+++ b/modules/ysipchan.cpp
@@ -601,7 +601,7 @@ private:
     void clearTransaction();
     void detectLocal(const SIPMessage* msg);
     void keepalive();
-    void setValid(bool valid, const char* reason = 0);
+    void setValid(bool valid, const char* reason = 0, const char* error = 0);
     virtual void changing();
 
     String m_registrar;
@@ -6573,7 +6573,7 @@ void YateSIPLine::setupAuth(SIPMessage* msg) const
 	msg->setAutoAuth(getAuthName(),m_password);
 }
 
-void YateSIPLine::setValid(bool valid, const char* reason)
+void YateSIPLine::setValid(bool valid, const char* reason, const char* error)
 {
     DDebug(&plugin,DebugInfo,"YateSIPLine(%s) setValid(%u,%s) current=%u [%p]",
 	c_str(),valid,reason,m_valid,this);
@@ -6588,8 +6588,8 @@ void YateSIPLine::setValid(bool valid, const char* reason)
 	if (m_domain)
 	    m->addParam("domain",m_domain);
 	m->addParam("registered",String::boolText(valid));
-	if (reason)
-	    m->addParam("reason",reason);
+	m->addParam("reason",reason,false);
+	m->addParam("error",error,false);
 	Engine::enqueue(m);
     }
 }
@@ -6774,7 +6774,7 @@ bool YateSIPLine::process(SIPEvent* ev)
 	default:
 	    // detect local address even from failed attempts - helps next time
 	    detectLocal(msg);
-	    setValid(false,msg->reason);
+	    setValid(false,msg->reason,lookup(msg->code,dict_errors,String(msg->code)));
 	    if (!m_keepTcpOffline)
 		setParty();
 	    Debug(&plugin,DebugWarn,"SIP line '%s' logon failure %d: %s",