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When block all calls is turned on for an extension currently you are only able to add area codes and DIDs to the whitelist. This becomes an issue when the same CID is used for all devices, as allowing the CID would enable all devices to call the blocked extension. If the ability to whitelist extensions was added this would allow whitelisting of a single device.
|Product Line||RingCentral Phone|
We have exactly this issue with a door lock that's linked to a User Account (through an ATA conversion to an analog connection). We want to "block all" and then whitelist a select group of internal extensions that are allowed to open the door. Currently, "block all" doesn't limit any internal extensions from calling, including the situation where an external caller goes through an IVR and then connects to an extension. This is a security risk.