You can change the time increments shown in your Outlook calendar to allow for smaller more detailed calendar entries. This will work in Outlook 2003, Outlook 2007, and Outlook 2010.
When creating a Meeting Request in Outlook, or on your iPhone/Android, you will want to enter all the conference call information in the “Location” line of the Meeting. This will allow callers to have the number auto-dial by tapping on the number when they open the meeting on their iPhone or Android. It will also dial the access code AUTOMATICALLY, after a short pause.