That's normal when you choose a password that isn't of type "Simple PIN" (since they have to present you the opportunity to type upper/lowercase letters and special characters.
If you want the big number method you have to change the type to "Simple PIN" and use an all numeric password. If this setting is enforced by your exchange server there's nothing you can do other than talk to your admin (or change your SIP to something like SPB Full Screen Keyboard).
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