[Openvpn-devel] how to trush each other with diff CAs

[Axin Chan]

openvpn 2.0  on debian 
If i have two  individual VPN Network, VPN Network Aand VPN Network B.
A is a full VPN system and has created a CA
B is also a full VPN system and have its own CA .
both of them works very well seperately, but a client in A want to connet
to the server in B.
how could this work, without the same CA.
Can openvpn  handel this kind of thing?  can you give me some advice?