Hello yyc932. We welcome you to the Xfinity Forums and thank you for creating your first post. Currently International calls placed to Taiwan using your Xfinity Voice home phone is $0.07 per minute to landlines, and $0.13 per minute to mobile phones.
You can view the International Rates here: https://www.xfinity.com/international-voice?showiro=yes
Please let us know if you need help with anything else. We're here to help.