how can i set up MPPE encryption on cisco 3725 router?

Hello I need to set up an ISDN call from cisco router but from some reason my router cisco 3725 12.3(9) won't take the command: "ppp encrypt mppe auto" I get this: Router(config-if)#ppp encrypt mppe auto ^ % Invalid input detected at '^' marker.

any idea how to enable this "ppp encrypt" ?

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ghsu2001
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