Thanks for reaching out about this. The Zoom Phone Outbound call schema should still be supported as of right now. However, we will be introducing API endpoints for handling outbound call initiation shortly, which at some point may be the preferred method for handling this action. Keep an eye on our changelog for this release.
Regarding injecting a caller ID, this is a great suggestion, but I do not believe it’s currently supported. If you’re so inclined, you might consider suggesting a feature request for this here: #feature-requests