We get a lot of calls from Indian call centres. Any nuisance call that comes is first directed through a small Raspberry PI computer running FreePBX/Asterisk software.
Here are a few calls recorded after setting this up...
http://bit.ly/2wDM5pg
This one is really funny:

https://www.dropbox.com/sh/yf86w00k3dvrb9s/AADZH8wsB7K4Z-u-P4x8qDAxa/2017-09-18/Recording_02.wav?dl=0
Here are a few calls recorded after setting this up...
http://bit.ly/2wDM5pg
This one is really funny:


https://www.dropbox.com/sh/yf86w00k3dvrb9s/AADZH8wsB7K4Z-u-P4x8qDAxa/2017-09-18/Recording_02.wav?dl=0
