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ag-lobalon Ask HN: I just heard someone else's call on Skype

Still you encrypt the calls (the comunication line is encrypted)

The spy /monitoring software can be running at your computer --thing that is usual-- (so before encrypting...)

They don't need to broke any encryption ("NSA style"), only a "bug on windows"...

ag-lobalon Ask HN: I just heard someone else's call on Skype

It cannot be a "Plain Old Telephone Service" (or analog) issue, because it is working with "VoIP"-- and it's digital since the audio enter at the computer.

ag-lobalon Ask HN: I just heard someone else's call on Skype

Maybe is an "IP conflict / IP duplication", and the VoIP packets go to both IP addresses.

IP duplication can be caused by some type of "monitoring/spy" at their (or your) computer, and a dynamic IP address.

it's not usual.