Originally Posted by GUWonder

Anonymous Call Block type features don’t magically get enabled when they weren’t enabled before. AA, or someone acting on AA’s behalf in whole or part, must have done something that resulted in a call block of some sort to just these blocked AA 800 numbers.

Toll free numbers in the US use ANI to capture inbound phone numbers, so using something like *67 wasn’t blocking much of anything when calling AA’s toll free numbers in the US. But perhaps Skype calls from those without Skype phone numbers weren’t getting AA the information AA wanted.