Please help me

Hi shail here
Very difficult problem I have here, I have two Domain Controllers on two different locations, means each location has one Domain Controller location A have sysportdc1.sysport.com and location B have cambayserver.sapphire.com domain. Both domains are independence to each other.

Details of sysportdc1.sysport.com
Network 192.168.0.0
Mask 255.255.255.0
ADS, DNS and DHCP services running on this
NAT Protocols configured on other one server
Cisco 2800 series router for radio link connectivity

Details of cambayserver.sapphire.com
Network 192.168.1.0
Mask 255.255.255.0
ADS, DNS services running on this server
NAT Protocols configured on other one server

Both locations connected through Radio Link to third party provider

I have add persistence route on both NAT server (i.e. C:\route ADD MASK -p) so I can ping with IP address from one location to other location.

Now I want to create trust relation between location A and location B. so what should I do.
Please explain in detail and help me please