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IIS-OTP INTERNAL DATABASE
  As a descendent of TCP Data's free Radius authentication server. IIS-OTP has an internal high speed lookup database to holds username/SMD-address data. It uses a high capacity, high-speed Hash Based lookup. It is capable of holding and providing rapid access to 10's of thousands of user records. The database is stored on disk as an easy to maintain ASCII text in standard 'flat file' format.

 
Cell Phone SMS Routing

In order to deliver SMS messages tot he user's cell phone. IIS-OTP must acces the carrier's internet SMTPgateway Tthis is easily done by accessing any standard SMTP server. All major carriers maintain such a gateway. they accept delivery of email from any standard email accounts of the type provided by Dailup Internet service providors. This is how Microsoft Outlook sends email. The delivery sequence is shown in the following diagram:

IIS-OTP Admin Client

SMS Email Address Entry

SMS Email Address Entry is an integral Part of the System. Every user must one. It can be entered interactively using IIS-OTP's built in asp pages of entered by the admin using the admin client. The asp screen that is central to sms email entry is tightly coupled with the ISAPI Filter component of IIS-OTP. The user can send any number of test emails until the correct one is found, the user than clicks the 'Save' button and the system saves the address, associated with the username, in the IIS-OTP database. Shown below it the address entry asp page shown trying a 'trial' address and saving the address into the database.

Address Entry Trial Address Message Sent

Address Saved to Database