I was unable to FAX to Taiwan being told it was an invalid phone number. Since I can phone Taiwan with my Sonic-provided phone, I assumed sending a FAX there would be supported. The FAX number for Cooler Master Technologies is +886-2-3234-0221, but that was not accepted. I then tried proceeding it with 011, for international calls from the USA, and that also was not accepted by the Sonic FAX dialog, although that format works with the Sonic-provided phone.
If international FAX is supported by the Sonic FAX dialog, how is the number need to be formatted?