Its one phone number per field in Missing Sync. Here's the field breakdown, so only one mobile number, one work, etc:
Mac <--------------> BlackBerry
Work <-------------> Work
Home <-------------> Home
Mobile <-------------> Mobile
Pager <-------------> Pager
Fax <-------------> Fax
Other <-------------> Other
Main < ------------> Work 2
N/A < ------------> Home 2
Custom < ------------> Direct Connect (Nextel devices)
User1 <-------------> User 1 (custom phone field)
User2<-------------> User 2 (custom phone field)
User3<-------------> User 3 (custom phone field)
User4<-------------> User 4 (custom phone field)
PIN <-------------> PIN (custom phone field)
This is posted here:
The Missing Sync for BlackBerry - Known Issues
Events created on the BlackBerry will transfer to iCal. Make sure you have a calendar selected in the calendar options "Put events created on device into"