ip phone clock sync with ntp ?

I've got some cisco 7940 phones running on a 2651xm router using call manager express. The time on the phone display however is often wrong. The router is configured to synchronise with an NTP server and the router clock always shows the right time but I can't find a config to make the phones do the same. I found one cisco doc but it only referred to unified call manager and not call manager express. Is there a config that will make the phone time stay in sync with an NTP server? thanks for any advice.

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