diff --git a/CHANGES_NEXT_RELEASE b/CHANGES_NEXT_RELEASE
index b7b6b9b..0f8d6fd 100644
--- a/CHANGES_NEXT_RELEASE
+++ b/CHANGES_NEXT_RELEASE
@@ -6,4 +6,5 @@
 - FIX Client handler after connection update (#51)
 - FIX Remove old device registration on the new registration (#52)
 - Add Travis CI files and changes to enable it in the package.json (#55).
-- Add Check lifetime and unregister devices (#56)
\ No newline at end of file
+- Add Check lifetime and unregister devices (#56)
+- Add Lifetime unregistration handler (#59)
\ No newline at end of file
diff --git a/lib/lwm2m-server.js b/lib/lwm2m-server.js
index ff69265..b779e6e 100644
--- a/lib/lwm2m-server.js
+++ b/lib/lwm2m-server.js
@@ -35,6 +35,7 @@ var coapRouter = require('./services/coapRouter'),
         op: 'LWM2MLib.Server'
     },
     apply = async.apply,
+    config,
     status = 'STOPPED';
 
 /**
@@ -103,13 +104,14 @@ function validateTypes(config, callback) {
     callback(error);
 }
 
-function start(config, startCallback) {
+function start(serverConfig, startCallback) {
     function loadDefaults(serverInfo, callback) {
         loadRoutes(serverInfo);
         loadDefaultHandlers(serverInfo, config);
         callback(null, serverInfo);
     }
 
+    config = serverConfig;
     if (config.logLevel) {
         logger.setLevel(config.logLevel);
     }
@@ -165,8 +167,26 @@ function isRunning() {
     return status === 'RUNNING';
 }
 
+/**
+ * Sets the handler callback for a given type of operation.
+ *
+ * The signature of the handler will depend on the operation being handled. The complete list of operations and the
+ * signature of its handlers can be found in the online documentation.
+ *
+ * @param {Object} serverInfo      Object containing all the information of the current server.
+ * @param {String} type         Name of the operation to be handled.
+ * @param {Function} handler    Operation handler.
+ */
+function setHandler(serverInfo, type, handler) {
+    coapRouter.setHandler(serverInfo, type, handler);
+
+    if (type === 'unregistration') {
+        registry.checkLifetime(config.lifetimeCheckInterval, handler);
+    }
+}
+
 exports.start = start;
-exports.setHandler = coapRouter.setHandler;
+exports.setHandler = setHandler;
 exports.stop = stop;
 exports.read = deviceManagement.read;
 exports.write = deviceManagement.write;
diff --git a/lib/services/server/inMemoryDeviceRegistry.js b/lib/services/server/inMemoryDeviceRegistry.js
index 8a46980..16e608f 100644
--- a/lib/services/server/inMemoryDeviceRegistry.js
+++ b/lib/services/server/inMemoryDeviceRegistry.js
@@ -153,13 +153,24 @@ function list(callback) {
 }
 
 
+/**
+ * Stops checking for device lifetime.
+ */
+function stopLifetimeCheck() {
+    clearInterval(checkLifetimeInterval);
+    checkLifetimeInterval = null;
+}
+
 /**
  * If Lifetime Resource exists, then the registration SHOULD be removed by the Server if a new registration or update
  * is not received within this lifetime.
  *
- * @param {Object} lifetimeCheckInterval           Minimum interval between lifetime checks in ms
+ * @param {Object}   lifetimeCheckInterval           Minimum interval between lifetime checks in ms
+ * @param {Function} unregistrationHandler           Unregistration device handler
  */
-function checkLifetime(lifetimeCheckInterval) {
+function checkLifetime(lifetimeCheckInterval, unregistrationHandler) {
+    stopLifetimeCheck();
+
     checkLifetimeInterval = setInterval(function(){
         list(function(error, deviceList){
             if (!error && deviceList) {
@@ -176,6 +187,12 @@ function checkLifetime(lifetimeCheckInterval) {
                                 logger.debug(context,
                                     'Lifetime unregistration for device [%s] ended successfully',
                                     obj.name);
+
+                                if (unregistrationHandler) {
+                                    unregistrationHandler(obj, function(){
+
+                                    });
+                                }
                             }
                         });
                     }
@@ -185,14 +202,6 @@ function checkLifetime(lifetimeCheckInterval) {
     }, lifetimeCheckInterval);
 }
 
-/**
- * Stops checking for device lifetime.
- */
-function stopLifetimeCheck() {
-    clearInterval(checkLifetimeInterval);
-    checkLifetimeInterval = null;
-}
-
 /**
  * Initializes the device registry based on the parameter found in the configuration. For this in memory registry this
  * function doesn't do anything.
diff --git a/lib/services/server/mongodbDeviceRegistry.js b/lib/services/server/mongodbDeviceRegistry.js
index ae507f8..1467694 100644
--- a/lib/services/server/mongodbDeviceRegistry.js
+++ b/lib/services/server/mongodbDeviceRegistry.js
@@ -200,13 +200,25 @@ function list(callback) {
     query.exec(callback);
 }
 
+
+/**
+ * Stops checking for device lifetime.
+ */
+function stopLifetimeCheck() {
+    clearInterval(checkLifetimeInterval);
+    checkLifetimeInterval = null;
+}
+
 /**
  * If Lifetime Resource exists, then the registration SHOULD be removed by the Server if a new registration or update
  * is not received within this lifetime.
  *
- * @param {Object} lifetimeCheckInterval           Minimum interval between lifetime checks in ms
+ * @param {Object}   lifetimeCheckInterval           Minimum interval between lifetime checks in ms
+ * @param {Function} unregistrationHandler           Unregistration device handler
  */
-function checkLifetime(lifetimeCheckInterval) {
+function checkLifetime(lifetimeCheckInterval, unregistrationHandler) {
+    stopLifetimeCheck();
+
     checkLifetimeInterval = setInterval(function(){
         list(function(error, deviceList){
             if (!error && deviceList) {
@@ -223,6 +235,12 @@ function checkLifetime(lifetimeCheckInterval) {
                                 logger.debug(context,
                                     'Lifetime unregistration for device [%s] ended successfully',
                                     obj.name);
+
+                                if (unregistrationHandler) {
+                                    unregistrationHandler(obj, function(){
+
+                                    });
+                                }
                             }
                         });
                     }
@@ -232,14 +250,6 @@ function checkLifetime(lifetimeCheckInterval) {
     }, lifetimeCheckInterval);
 }
 
-/**
- * Stops checking for device lifetime.
- */
-function stopLifetimeCheck() {
-    clearInterval(checkLifetimeInterval);
-    checkLifetimeInterval = null;
-}
-
 /**
  * Initializes the device registry based on the parameter found in the configuration. The MongoDB config object should
  * contain at least the host string needed to connect to MongoDB and the database name where to store the device info.