So I’ve gotten the feature code to work in the Cisco SPA phones, where if you dial either the feature code or press the button that I created for speeddial it enters *20 for example then gives you a “secondary” dial tone and the caller ID modification works fine.
However on the Sangoma Phones all it does when you hit either the speedial button for the feature code or manually enter the feature code *20 it just “hangs up” it never makes a tone or dials out and doesn’t modify the caller ID info.