REPOST: Contacts/Global Address List/Automated Dialling

We can currently initiate telephone calls from within our contacts folders,
plus some public (contact) folders, by right-clicking and selecting Call
Contact.

This feature could use our mobile phones (via Bluetooth) but more usually it
uses our BCM office phone system. This all works fine.

However, under this system we are maintaining a lot of duplicate data: 1 x
Active Directory, 1 x Exchange 5.5 directory, and several public contact
folders.

We are moving to Exchange 2003 soon which will mean that Exchange will
directly tap into AD, rather than maintain it's own directory. We would also
like to be rid of the public contact directories as well, since this too is
merely duplicated AD data.

The problem we have is that we initiated calls from both private & public
contact folders, but not from Exchange's Global Address List - this appears
to a limitation in Outlook.

Is there a way of initiating calls from the Global Address List?

If Outlook can't handle it directly, are there any free/cheap 3rd party
tools that we could use?

Alternatively, is there a way of populating each users Contacts list, either
dynamically or statically

Thanks in advance...

Chris