I had a similar setup and ran into issues until I figured out that my sip provider was restricting custom caller ID unless I verified the numbers first. Once I added them to the control panel and waited for approval, the spoofing part worked fine. Some sip provider setups also strip or overwrite...
I had the same issue with the install path showing a blank page—turned out I missed editing the .env file properly. Double-check your database settings there, that fixed it for me.
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To get the most from this, I went into the settings and customized the widgets to focus on crypto...