faxes to Belgium get "Error: Unknown error occured"

[ronoval]

This is the error I get when sending faxes to Belgium:

An error is occured while transmitting your fax.
The reason for the error is stated below.
Please check the fax number and possibly try again later.

Receiver: +322xxxxxxx
Date: 2019-08-02 10:19:01
Error: Unknown error occured

http://fax.pdf24.org

I tried two different recipients both with and without the "0" after the country code. What's the problem?

[Author]

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