I have a unity 4.0 system and want to add multiple DC's to the unity server. On the unity server there appears to me a field to enter a 2nd DC but it is grayed out. I have done some research and it appears this is not a license issue.
Actually the DC/GC Reconnect Tool only allows you to configure the DC/GC that Cisco Unity's directory Monitors (AvDSAD and AvDSGlobalCatalog) use to synch with Active Directory.
In the situation you describe where messages are not delivered after a reboot of the DC, I have to assume the DC is also a GC, you would want to look at the GC that MAPI is using, not the DC/GC that the directory monitors are using.
See the following:
When GC is down, voicemail is not delivered
Ah... yeah, you'll need to manually edit the registry:
Hope that helps,
Yep, that's where the DC/GC Reconnect Settings tool comes into play as I discussed.