how to make a screen appear that can dial an extension on an outgoing call.

When I make a call on my iPhone 6S and the responder asks me to "Press 1" or another extension number, I do not know how to raise a screen that will do that. When I press the icon with the telephone on it, I am able to choose a white faced dial screen on which I can dial a phone call, but not an extension number. The screen that lets me enter an extension is black faced, but I do not know how to make it appear.

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