Browsing in two domains in different subnets

Hello,

i have two subnets, each with its own PDC. Both networks are connected
over WAN.

Network 1:
PDC: PDC1 (Samba 2.2.8a)
Net: 192.168.29.0/24
Domain: Domain1

Network 2:
PDC: PDC2 (Samba 3.0.3)
Net: 192.168.30.0/24
Domain: Domain2

I want that each Network can see the other. I tried "remote browse sync"
in smb.conf to the other PDC. But then I see only the Domainname in the
network neighbourhood. If I doubleclick on it, after a 10 seconds
timeout, I see an empty window.

I also tried "remote announce = 192.168.29.4/Domain2"
on PDC2, but then noting happens. If is say instad Domain2 Domain1 then
the server is shown as a member of Domain1 on Network1. I would like to
see each Server under its Domain.

Where could I have made an error?

Best regards
Marc