diff --git a/classes/attendance_webservices_handler.php b/classes/attendance_webservices_handler.php
index c961362..2439bc7 100644
--- a/classes/attendance_webservices_handler.php
+++ b/classes/attendance_webservices_handler.php
@@ -158,4 +158,24 @@ class attendance_handler {
             $DB->update_record('attendance_sessions', $attendancesession);
         }
     }
+
+    /**
+     * For this attendance instance, returns all sessions.
+     *
+     * @param int $attendanceid
+     * @return mixed
+     */
+    public static function get_sessions($attendanceid) {
+        global $DB;
+
+        $sessions = $DB->get_records('attendance_sessions', array('attendanceid' => $attendanceid), 'id ASC');
+
+        $sessionsinfo = array();
+
+        foreach($sessions as $session) {
+            $sessionsinfo[$session->id] = self::get_session($session->id);
+        }
+
+        return $sessionsinfo;
+    }
 }
diff --git a/db/services.php b/db/services.php
index 6cc2584..4e0f049 100644
--- a/db/services.php
+++ b/db/services.php
@@ -67,13 +67,19 @@ $functions = array(
         'description' => 'Method that retrieves the session data',
         'type'        => 'read',
     ),
-
     'mod_attendance_update_user_status' => array(
         'classname'   => 'mod_attendance_external',
         'methodname'  => 'update_user_status',
         'classpath'   => 'mod/attendance/externallib.php',
         'description' => 'Method that updates the user status in a session.',
         'type'        => 'write',
+    ),
+    'mod_attendance_get_sessions' => array(
+        'classname'   => 'mod_attendance_external',
+        'methodname'  => 'get_sessions',
+        'classpath'   => 'mod/attendance/externallib.php',
+        'description' => 'Method that retrieves the sessions in an attendance instance.',
+        'type'        => 'read',
     )
 );
 
@@ -88,7 +94,8 @@ $services = array(
             'mod_attendance_remove_session',
             'mod_attendance_get_courses_with_today_sessions',
             'mod_attendance_get_session',
-            'mod_attendance_update_user_status'
+            'mod_attendance_update_user_status',
+            'mod_attendance_get_sessions'
         ),
         'restrictedusers' => 0,
         'enabled' => 1,
diff --git a/externallib.php b/externallib.php
index 163a880..6a9b7cb 100644
--- a/externallib.php
+++ b/externallib.php
@@ -543,4 +543,65 @@ class mod_attendance_external extends external_api {
     public static function update_user_status_returns() {
         return new external_value(PARAM_TEXT, 'Http code');
     }
+
+    /**
+     * Get sessions params.
+     *
+     * @return external_function_parameters
+     */
+    public static function get_sessions_parameters() {
+        return new external_function_parameters(
+                    array(
+                        'attendanceid' => new external_value(PARAM_INT, 'Attendance id.', VALUE_REQUIRED),
+                    )
+                );
+    }
+
+    /**
+     * Describes get_sessions return values.
+     *
+     * @return external_multiple_structure
+     */
+    public static function get_sessions_returns() {
+        $statuses = array('id' => new external_value(PARAM_INT, 'Status id.'),
+                          'attendanceid' => new external_value(PARAM_INT, 'Attendance id.'),
+                          'acronym' => new external_value(PARAM_TEXT, 'Status acronym.'),
+                          'description' => new external_value(PARAM_TEXT, 'Status description.'),
+                          'grade' => new external_value(PARAM_FLOAT, 'Status grade.'),
+                          'visible' => new external_value(PARAM_INT, 'Status visibility.'),
+                          'deleted' => new external_value(PARAM_INT, 'informs if this session was deleted.'),
+                          'setnumber' => new external_value(PARAM_INT, 'Set number.'));
+
+        $users = array('id' => new external_value(PARAM_INT, 'User id.'),
+                       'firstname' => new external_value(PARAM_TEXT, 'User first name.'),
+                       'lastname' => new external_value(PARAM_TEXT, 'User last name.'));
+
+        $attendancelog = array('studentid' => new external_value(PARAM_INT, 'Student id.'),
+                                'statusid' => new external_value(PARAM_TEXT, 'Status id (last time).'),
+                                'remarks' => new external_value(PARAM_TEXT, 'Last remark.'),
+                                'id' => new external_value(PARAM_TEXT, 'log id.'));
+
+        $session = self::get_session_structure();
+        $session['courseid'] = new external_value(PARAM_INT, 'Course moodle id.');
+        $session['statuses'] = new external_multiple_structure(new external_single_structure($statuses));
+        $session['attendance_log'] = new external_multiple_structure(new external_single_structure($attendancelog));
+        $session['users'] = new external_multiple_structure(new external_single_structure($users));
+
+         return new external_multiple_structure(new external_single_structure(($session)));
+    }
+
+    /**
+     * Get sessions.
+     *
+     * @param int $attendanceid
+     */
+    public static function get_sessions($attendanceid) {
+        global $DB;
+
+         $params = self::validate_parameters(self::get_sessions_parameters(), array(
+            'attendanceid' => $attendanceid,
+        ));
+
+        return attendance_handler::get_sessions($params['attendanceid']);
+    }
 }