Authenticate to different LDAP Servers

Hi

I have the following scenario:

I’‘m using Jive Messenger with AD Authentication in the local network. We have people working out of the office connecting through VPN and authenticating to a different AD server located on the DMZ. I would like to know if it’'s possible to configure Jive server to check both LDAP servers for authentication so people from the local lan and people connecting through VPN can use the same server

thanks!

Nelson