We have an expert team that manages questions specific to CyberSource. Please reach out to the CyberSource team directly.
CyberSource Support - 800-709-7779
Currently, the only method to properly query the CyberCource Payments sandbox is creating a merchant account directly with CyberSource:
Luckily, their site also provides an easy to use method to test their account credentials:
Additionally, here are the following links for sample code:
Have You Tried to Submit for MID Account CyberSource?
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Thanks and Regards
Can you please let us know what country and region you are calling from? Also, can you clarify what you mean when you write "800-709-7779 is empty"?
To make international calls, first dial 00, the international calling access code used in the country. Then dial the country code for the country you need to reach (1 for the U.S.), followed by 800-709-7779.
Besides that, you can also try to make the phone call using VoIP and see if that works.