PDAsync does not add contact information to a Task item, because there usually isn't an appropriate corresponding field on the mobile device. However, PDAsync has the ability to map fields, so you can investigate whether another unused field might work.
To create a custom mapping in PDAsync
Product: PDAsync
KB: 652
Last updated: Feb 8, 2002
Keywords:
Mobile Device Synchronizing: ACT
Platforms:
Wildcards (internal use):