Real-time voice or video communication between users on mobile devices or computers
I'm getting exactly the same error message when calling this number in China.
There are two possible reasons for this issue:
- There might indeed be a technical issue when routing this call.
- The recipient does not accept anonymous calls. Microsoft has recently disabled any Caller ID on Skype, so all Skype Dial Pad calls are now Anonymous (Private).
Sorry, but I don't think that there is anything you can do on your side in order to rectify this issue.