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A virtual number, also known as direct inward dialing (DID) or access numbers, is a telephone number without a directly associated telephone line.Usually, these numbers are programmed to forward incoming calls to one of the pre-set telephone numbers, chosen by the client: fixed, mobile or VoIP.
Definitions. ISO 27005 defines vulnerability as:. A weakness of an asset or group of assets that can be exploited by one or more threats, where an asset is anything that has value to the organization, its business operations, and their continuity, including information resources that support the organization's mission