How to make a call from calendar using a number in my calendar?

One of the few frustrating things about the iphone is how I cannot seem to find a way to dial a conference call number that is in my calendar nor dial the passcodes required for most business conference calls. In my case, I am synchronizing with Outlook Exchange. Unlike a number that appears in email being automatically "clickable," the lengthy and hard to remember 1-888 numbers and the pass codes show up as just text. Is there a workaround or an app to help with dialing into conference bridges? Otherwise, even with the power of an iPhone 4, I am still writing pass codes and numbers on napkins in the car. Thanks for any tips!!