php - How to catch a calendar item created event using push notifications? -

i'm trying fire event when create calendar item (appointment) in exchange, using php-ews. currently, able fire event when email sent:

    $subscribe_request = new \ewstype_subscribetype();     $pushsubscription = new \ewstype_pushsubscriptionrequesttype();     $pushsubscription->statusfrequency = 1;     $pushsubscription->url = 'http://someserver/log.php';     $folderids = new \ewstype_nonemptyarrayofbasefolderidstype();     $eventtypes = new \ewstype_nonemptyarrayofnotificationeventtypestype();     $folderids->distinguishedfolderid = new \ewstype_distinguishedfolderidtype();     $folderids->distinguishedfolderid->id = \ewstype_distinguishedfolderidnametype::inbox;      $eventtypes->eventtype = "newmailevent";     $pushsubscription->folderids = $folderids;     $pushsubscription->eventtypes = $eventtypes;     $subscribe_request->pushsubscriptionrequest = $pushsubscription;      return $this->ews->subscribe($subscribe_request); 

log.php

class ewsservice {   public function sendnotification($arg) {     file_put_contents("c:\\exchangelogs\\log_".time().".txt", print_r($arg,1));     $result = new ewstype_sendnotificationresulttype();     $result->subscriptionstatus = 'ok';     //$result->subscriptionstatus = 'unsubscribe';     return $result;   } }  $opts = array(); $server = new soapserver(   'notificationservice.wsdl',    array('uri' => 'http://someserver/log.php'));  $server->setobject($service = new ewsservice()); $server->handle(); 

every minute 'keep alive message' sent , sendnotification function called. same thing happens when mail sent (using outlook or whatever).

this works fine.

however, want same when calendar item created, such appointment. tried changing distinguishedfolderidnametype calendar , eventtype createdevent, receive no message when appointment created.

any appreciated.