[Skypeenglish] A strange skype problem

[Alex Stone]

I have a friend who I'm trying to talk to on skype, but I can't here
anything they're saying. We've been through all his microphone and skype
audio settings but no luck. However the really strange thing which I really
can't figure out, is that the skype test call works fine for hymn. Any
ideas?
Cheers
Alex