ios - Parse app not playing sound with push notifications -

i have app uses parse.com push notifications. these triggered cloud code, notifications, while firing, coming in silent, no sound, no vibration nothing. going wrong it?

pushquery.equalto('channels', newuserid);                       if (anonymous2 == "false") {                       parse.push.send({ where: pushquery, // set our installation query data: { alert: firstname2 + " " + lastname2 + " " + "just added prayer request." } }, { success: function() {     // push successful }, error: function(error) {     throw "got error " + error.code + " : " + error.message; } });                       }