How can I add a related record's e-mail/phone to the activities form in Microsoft CRM 2011?

I go to Workplace | MyWork | Activities and open an activity. I would like to have the Contact/Lead's e-mail and Phone number below the Regarding field.
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Chinmay PatelConnect With a Mentor Enterprise ArchitectCommented:
Hi mihaisz,

 - Create email field and phone number field on email and phone call activity
 - Write a workflow, which on change of Regarding field, should trigger and populate the values.

Let me know if you need help with that.

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