Problem: Sharing fax on Server 2003 - XP SP2

This is my setup:

- Windows 2003 server standard edition SP1
- with E-tech Bullet 56K modem
- installed fax printer, fax printer is working on server, shared as 'Fax'
- on server Fax Console says 'Ready' (bottom) and in Tools, Fax Printer
Status 'Local / Online'
- Fax is working!

- Multiple XP home/pro SP2 clients
- Clients are not in server domain, but can connect to server
- Installing fax printer on client: go to \\servername, log on using
Administrator, password
- Double click 'Fax' to install shared fax printer
- After installing, fax console says 'All fax printers are inaccessible'
(bottom)
- Tools, Fax Printer Status says 'servername / Connection error'

I tried fixfax.reg but didn't help. Please help me, have been searching on
Google/newsgroups for days.

Thanks,
Niels