Export the partition's telephone number inventory as csv, synchronously

Use to retrieve a report on the partition's telephone number inventory. Inventory from subpartitions is also included.<br/><br/> Note that telephone numbers currently assigned are NOT part of the inventory and are not listed in this report.<br/><br/> This version is synchronous, and if the inventory is large, then this single call can take a long time. Please use <a href="#/~operation/Telephone%20Number/asyncExportTnInventory">asyncExportTnInventory</a> instead, if possible.<span hidden><br/><br/> Please see <a href="tnInventory.html">here</a> for more information about how the CSV is formatted.</span>