Skype Vi fails making a phone call

Skype Vi from here https://decibel.ni.com/content/docs/DOC-1287
I exactly followed the steps written the web page. When I run it, it does have skype making a call, but the skype hang up after only a few seconds and shows the message "call weitong_cellphone, no answers". Labview doesn't show any errors.
While with skype itself, I can paly a call to the phone number successfully.

I found the problem may be due to the labview invoking skype with "placecall" action. This "placecall" starts skype call , not call to a mobile or telephone number.
How can solve this problem?
Wei Tong
Attachments:
skypecall.png ‏29 KB

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