Go to the Voxtelesys Portal and log in.
Click on the "Documents" tab and select "Invoices" from the drop-down menu.
Save All and Download are the two download options in the Voxtelesys Portal.
If you choose to select "Save All," then it will save as a .ZIP file (which contains .PDF files):
If you choose to select "Download," then it will save as a .PDF file: