Do I need autosub here?

gistfile1.js

//Client
Meteor.subscribe("requests", Session.get('player_id'), function(){
    var call = Calls.findOne();
    Meteor.call("answerCall", call._id);
});

//Server
Meteor.publish("requests", function(player_id) {
    if(player_id == undefined) return null;
    return Calls.find({toUser: player_id, status: "request"});
});