Option to just block internal calls and not see any directory allowing only External calls only.
I understand that in many instances, it is standard practice to restrict all external calls on a device. However, there are specific scenarios where blocking internal calls (excluding voicemail) becomes necessary. In such cases, there is a requirement to limit the device to receiving only external calls and making external calls exclusively. This setup essentially mimics the functionality of an independent individual line, akin to a home phone situated in a separate location.