[asterisk-app-dev] How do I get variables from ARI Asterisk?

[Oscar]

How do I get variables from ARI Asterisk?

I've done:
$ch = curl_init();   curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);   curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);   curl_setopt($ch, CURLOPT_URL,"http://192.168.56.12:8088/ari/channels");   curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);   curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);   curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);   curl_setopt($ch, CURLOPT_USERPWD, "asterisk:asterisk");   curl_setopt( $ch, CURLOPT_HTTPHEADER, array('Content-Type:application/json'));      curl_setopt($ch,CURLOPT_POST, true);
$variables = array("channelId"=>$data->channel->id);   $queryParameter = array("endpoint" => "SIP/201", "extension" => "201", "context" => "oscar", "priority" => "1", "app" => "call-center", "variables" => $variables);   curl_setopt($ch,CURLOPT_POSTFIELDS, json_encode($queryParameter));
 $result=curl_exec($ch);
(where $data->channel->id is datas from "generate an outbound call")
the calling work fine, but in websocket/app "call-center" I haven't got the args, why?
I receive:
{  "type": "StasisStart",  "timestamp": "2015-02-19T19:28:25.069+0100",  "args": [],  "channel": {    "id": "asterisk_oscar-1424370499.121",    "name": "SIP/201-0000003d",    "state": "Up",    "caller": {      "name": "",      "number": ""    },    "connected": {      "name": "",      "number": ""    },    "accountcode": "",    "dialplan": {      "context": "oscar",      "exten": "",      "priority": 1    },    "creationtime": "2015-02-19T19:28:19.527+0100"  },  "application": "call-center"}

What do I mistake?thanks _______________________________________________________________________
Oscar OXY
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