diff --git a/common/JackEngine.cpp b/common/JackEngine.cpp
index d7872a85..b82d0ca7 100644
--- a/common/JackEngine.cpp
+++ b/common/JackEngine.cpp
@@ -677,15 +677,17 @@ int JackEngine::ClientActivate(int refnum, bool is_real_time)
             fGraphManager->ActivatePort(output_ports[i]);
         }
         
+        // Notify client
+        NotifyActivate(refnum);
+        
         // Then issue port registration notification
-        for (int i = 0; (i < PORT_NUM_FOR_CLIENT) && (input_ports[i] != EMPTY) ; i++) {
+        for (int i = 0; (i < PORT_NUM_FOR_CLIENT) && (input_ports[i] != EMPTY); i++) {
             NotifyPortRegistation(input_ports[i], true);
         }
-        for (int i = 0; (i < PORT_NUM_FOR_CLIENT) && (output_ports[i] != EMPTY) ; i++) {
+        for (int i = 0; (i < PORT_NUM_FOR_CLIENT) && (output_ports[i] != EMPTY); i++) {
             NotifyPortRegistation(output_ports[i], true);
         }
 
-        NotifyActivate(refnum);
         return 0;
     }
 }
@@ -744,6 +746,7 @@ int JackEngine::PortRegister(int refnum, const char* name, const char *type, uns
     jack_log("JackEngine::PortRegister ref = %ld name = %s type = %s flags = %d buffer_size = %d", refnum, name, type, flags, buffer_size);
     AssertRefnum(refnum);
     assert(fClientTable[refnum]);
+    JackClientInterface* client = fClientTable[refnum];
 
     // Check if port name already exists
     if (fGraphManager->GetPort(name) != NO_PORT) {
@@ -753,6 +756,8 @@ int JackEngine::PortRegister(int refnum, const char* name, const char *type, uns
 
     *port_index = fGraphManager->AllocatePort(refnum, name, type, (JackPortFlags)flags, fEngineControl->fBufferSize);
     if (*port_index != NO_PORT) {
+        if (client->GetClientControl()->fActive)
+            NotifyPortRegistation(*port_index, true);
         return 0;
     } else {
         return -1;
@@ -764,11 +769,14 @@ int JackEngine::PortUnRegister(int refnum, jack_port_id_t port_index)
     jack_log("JackEngine::PortUnRegister ref = %ld port_index = %ld", refnum, port_index);
     AssertRefnum(refnum);
     assert(fClientTable[refnum]);
+    JackClientInterface* client = fClientTable[refnum];
 
     // Disconnect port ==> notification is sent
     PortDisconnect(refnum, port_index, ALL_PORTS);
 
     if (fGraphManager->ReleasePort(refnum, port_index) == 0) {
+        if (client->GetClientControl()->fActive)
+            NotifyPortRegistation(port_index, false);
         return 0;
     } else {
         return -1;
diff --git a/tests/test.cpp b/tests/test.cpp
index 1c558bc2..9477d731 100644
--- a/tests/test.cpp
+++ b/tests/test.cpp
@@ -821,6 +821,8 @@ int main (int argc, char *argv[])
         printf("error : port_set_name function can't be tested...\n");
     }
 
+    port_callback_reg = 0;	// number of port registration received by the callback
+    
     /**
      * Activate the client
      *
@@ -839,6 +841,20 @@ int main (int argc, char *argv[])
 
     if (port_rename_clbk == 0)
         printf("!!! ERROR !!! Jack_Port_Rename_Callback was not called !!.\n");
+        
+        
+    /**
+     * Test if portregistration callback have been called.
+     *
+     */
+     
+    jack_sleep(1 * 1000); 
+
+    if (1 == port_callback_reg) {
+        Log("%i ports have been successfully created, and %i callback reg ports have been received... ok\n", 1, port_callback_reg);
+    } else {
+        printf("!!! ERROR !!! %i ports have been created, and %i callback reg ports have been received !\n", 1, port_callback_reg);
+    }
  
     /**
      * Test if init callback initThread have been called.
@@ -1094,11 +1110,14 @@ int main (int argc, char *argv[])
     }
 
     jack_sleep(1 * 1000); // To hope all port registration and reorder callback have been received...
+    
+    // Check port registration callback
     if (j == port_callback_reg) {
         Log("%i ports have been successfully created, and %i callback reg ports have been received... ok\n", j, port_callback_reg);
     } else {
-        printf("!!! ERROR !!! %i ports have been created, and %i callback reg ports have been received !\n", j, k);
+        printf("!!! ERROR !!! %i ports have been created, and %i callback reg ports have been received !\n", j, port_callback_reg);
     }
+    
     if (reorder == (2 * j)) {
         Log("%i graph reorder callback have been received... ok\n", reorder);
     } else {
@@ -1146,6 +1165,7 @@ int main (int argc, char *argv[])
      * Deregister all ports previously created.
      *
      */
+    port_callback_reg = 0; // to check registration callback
     Log("Deregistering all ports of the client...\n");
     inports = jack_get_ports(client1, NULL, NULL, 0);
     a = 0;
@@ -1159,6 +1179,13 @@ int main (int argc, char *argv[])
         }
         a++;
     }
+    
+    // Check port registration callback again
+    if (j == port_callback_reg) { 
+        Log("%i ports have been successfully created, and %i callback reg ports have been received... ok\n", j, port_callback_reg);
+    } else {
+        printf("!!! ERROR !!! %i ports have been created, and %i callback reg ports have been received !\n", j, port_callback_reg);
+    }
 
     free(inports); // free array of ports (as mentionned in the doc of jack_get_ports)