Regular telephone dials has always been NC, Kellogg had an intercom system with NO contacts, never seen one. Should be possible to adjust yours, or just connect it differently.
Usually a rotary dial has at least 2 set of contacts, the pulsing one, and one or more contacts shorting out the clicking sound from the receiver. using both contact sets you may close the contact when the dial leaves the rest position, and the pulse the number of breaks referring to the number of the dial. This will result in one more pulse than you actually want. That may be solved by moving/adjusting the shorting contact set the shorting to short before the last break, or maybe just adjusting the pulse brakes to be NO.
A picture of the back side of the dial may help us giving you a better answer.
The type I dial I know best are on picture:
https://goo.gl/ejXdTb
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