Hello,
You probably do not have an outbound rule to allow those calls.
Are the calls performed by a user extension or by the 3CX system?
Please see our presentation on outbound routing to create the appropriate rules to allow your calls:
https://www.3cx.com/3cxacademy/videos/advanced/configuring-outbound-routing/
Specifically from slide 9 - for system extensions
And can you also describe how the calls are automated?
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