Ops-Genie used to use about 5 phone numbers (that I've observed over the last 12-24 months) that were used for outbound alert notification.  Today I received a notification from "UNKNOWN CALLER" using a completely different area code.  I missed the alert, btw due to the unpublished change in behavior and unintuitive design.  My fault, ultimately.  However, your solution could be smarter.

With all of the SPAM calling present today, a single outbound caller ID is a "must have." The user can then easily add this to their SPAM whitelist or simply add an entry in their phone's contact list for easy ID.

This is not a cutting edge technical novelty.  This telecom capability has been around for many years.  So why not implement it?