abc123 said:in the settings for the extension you can disable outbound external calls for each extension (bottom of the page on the Other tab)
leejor said:Any incoming (external) call only go where you tell it to. If the extension doesn't have a DID number and is not part of a queue or ring group, or someone doesn't dial it from a menu from within an automated attendant, then it should never receive any ,direct, outside calls. However, you won't be able to stop someone from transferring an external call to an extension.
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