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Step 1: Customer logs into their VPN client with their username and password
Step 2: The NAS receives the request
Step 3.1: NAS makes an authentication request to the Authenticator server
Step 3.2: As no SMS Token was included the request was incomplete
Step 4.1 / 4.2: The NAS triggers the VPN Client to prompt for a SMS token.
Step 5.1 / 5.2: The Authentication server sends an SMS with the SMS token to the user.
Step 6.1: The user enters the SMS token into the VPN
Step 6.2: The NAS receives the SMS token
Step 7.1 The NAS requests validation of the complete set of parameters: username/password/SMS token
Step 7.2: The Authenticator server grants authorization.