Google Calendar on iPhone - calling phone numbers direct from event

In much the same way that you can access a map by touching on the address in a Google Calendar event on the iPhone, we would also like to be able to touch on a phone number and call directly from the event.
Can this be done??

Please note, we have looked into using iCal but have encountered the opposite problem - we can call direct from the event, but can not get a map with out copying and pasting a link.