I am configuring VPIM between Unity and CUE in different domains. The Exchange Server is installed together with Unity and is being used as the DNS server. The Messages and the MWI's for messages from Unity to CUE are working fine. However the messages from CUE get delivered to the Unity site but the MWI does not work and nor is the caller able to retrieve the messages when he logs on to Unity. There are no remote mailboxes for the users.
I can see that the Subject line of the messages that reach the Exchange Server is blank. I have been told that it should indicate the message being a VPIM message of some sort.
Please feel free to ask for more specific information to help trouble shoot. I don't know what configuration parameters to post here.
Thank you in advance for any help.