Searching nested table content through default search box.

Prabs

Hi,
I am trying to search nested table content from the default search box. i have followed the example https://datatables.net/examples/api/row_details.html to create the nested table.

All works fine, except I am not able to search anything inside the nested table. I don't want nested table values to be added as hidden column in the parent table, is there another way to achieve this.

Example,
Based the URL provided, In the first nested table
Extension number: 5407

if I type 5407 in the search box, i want the parent row containing a matching extension number in the nested table to be displayed.
Thanks in Advance
Cheers!