Also you need to setup either conditional forwarder or secondary zone of both domains to each other so that they can identify each other and then you can establish trustYou can also use stub zones to accomplish this. They're easier to set up than secondaries, since you don't have to configure zone transfers.
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Also you need to setup either conditional forwarder or secondary zone of both domains to each other so that they can identify each other and then you can establish trust
Check below post to establish conditional forwarder in 2003 Domain
http://www.itgeared.com/articles/1035-configuring-dns-conditional-forwarding/
http://www.computerperformance.co.uk/w2k3/services/DNS_conditional_forward.htm
If you wish to use zone transfer method, then 1st you need to enable zone transfer on domain.com zone in both domains and allow zone transfer for opposite domain dns server
http://technet.microsoft.com/en-us/library/cc782181(v=ws.10).aspx
Then you need to setup secondary zone of both domains vice versa
http://technet.microsoft.com/en-us/library/cc816885(v=ws.10).aspx
Once you done that check with nslookup query at both side dns servers
1.On your DNS, click Start, and then click Run.
2.In the Open box, type cmd.
3.Type nslookup, and then press ENTER.
4.Type set type=all, and then press ENTER.
5.Type _ldap._tcp.dc._msdcs.Domai
http://support.microsoft.com/kb/816587
If above Nslookup queries are successful, then you can build trust
Mahesh