In a call layout the related phone number from, say, the lead, doesn't display in the call layout. You can get to the phone number by clicking the preview of the relatad lead from the leads listview below the call, but if the call belongs to an opportunity you cannot do this, as the opp does not have the phone number as a field. At best the phone number belongs to the lead or contact.
We would like to display the phone number related to the lead. Or any other ideas, we're all ears