diff --git a/classes/attendance_webservices_handler.php b/classes/attendance_webservices_handler.php
index c961362..d0c0d7a 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..d7cbfb6 100644
--- a/externallib.php
+++ b/externallib.php
@@ -543,4 +543,41 @@ 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() {
+        return new external_multiple_structure(self::get_session_returns());
+    }
+
+    /**
+     * 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']);
+    }
 }
diff --git a/tests/externallib_test.php b/tests/externallib_test.php
index e7262e8..18e7ee0 100644
--- a/tests/externallib_test.php
+++ b/tests/externallib_test.php
@@ -471,4 +471,39 @@ class mod_attendance_external_testcase extends externallib_advanced_testcase {
         $this->assertInstanceOf('\core\event\calendar_event_created', $events[0]);
         $this->assertInstanceOf('\mod_attendance\event\session_added', $events[1]);
     }
+
+    public function test_get_sessions() {
+        $this->resetAfterTest(true);
+
+        $courseswithsessions = attendance_handler::get_courses_with_today_sessions($this->teacher->id);
+        $courseswithsessions = external_api::clean_returnvalue(mod_attendance_external::get_courses_with_today_sessions_returns(),
+            $courseswithsessions);
+
+        foreach ($courseswithsessions as $course) {
+
+            $attendanceinstances = $course['attendance_instances'];
+
+            foreach ($attendanceinstances as $attendanceinstance) {
+
+                $sessionsinfo = $attendanceinstance['today_sessions'];
+
+                foreach ($sessionsinfo as $sessioninfo) {
+
+                    $sessions = attendance_handler::get_sessions($sessioninfo['attendanceid']);
+                    $sessions = external_api::clean_returnvalue(mod_attendance_external::get_sessions_returns(),
+                        $sessions);
+
+                    foreach ($sessions as $session) {
+                        $sessiontocompareagainst = attendance_handler::get_session($session['id']);
+                        $sessiontocompareagainst = external_api::clean_returnvalue(mod_attendance_external::get_session_returns(),
+                            $sessiontocompareagainst);
+
+                        $this->assertEquals($this->attendance->id, $session['attendanceid']);
+                        $this->assertEquals($sessiontocompareagainst['id'], $session['id']);
+                        $this->assertEquals(count($session['users']), count($sessiontocompareagainst['users']));
+                    }
+                }
+            }
+        }
+    }
 }