DataTable sorting not working in Jquery

function initGrid() {
    oTable = $('#grid').dataTable({
        'bProcessing': false
		, 'bFilter': false
		,'bSort': true                   
		, 'bPaginate': false
		, 'bServerSide': true
		, 'iDisplayLength': -1
       ,'orderFixed': [ 0, 'asc' ]
	//	, 'aaSorting':  [[1, "asc"]]
		//,'aaSortingFixed': [[1, 'asc']]        
		, 'sAjaxSource': 'XYZ.aspx/ABCDE'
		, 'fnServerData': function (sSource, aoData, fnCallback) {
		    $.ajax({
		        'dataType': 'json'
				, 'contentType': 'application/json;'
				, 'type': 'POST'
				, 'data': "{ consultorId: '" + selectedConsultor + "' }"
				, 'url': sSource
				, 'success': function (msg) {
				    oTableInitialized = true;
				    drawGrid(msg);
				    $('.listContent').jScrollPane({ showArrows: false });
				}
				, 'error': function (msg) { onError(msg); }
		    });
		    
		}
		 //,'aaSortingFixed': [[1, 'asc']]       
    });
}