This is a rather complicated topic and I may not be able to adiequately cover it here. Also, in their defense, Cico TAC is only a break/fix organization. They're not intended to assist with solutions design; that's what Cisco partners are for.
There are two - three if you add SSO - separate issues at hand here:
Cisco UC Manager is only capable of handling a single DNS namespace. In Microsoft AD this means a single forest. If you want to connect to multiple forests you must use a Microsoft Lightweight Directory (aka ADAM in 2003 parlance). Cisco wants nothing to do with the configuration of LDS, only what it presents to CUCM. You'll want a Microsoft-oriented engineer to assist with this and I suggest doing this in a lab environment first.
Cisco Jabber/IM&P is only capable of having a single presence domain. It's either bbb.com or ddd.com, not both. The presence domain defines a user's XMPP/SIP URI. This becomes esspecially important should you want to federate with the outside world. This is entirely separate from the multi-forest problem you appear to have with CUCM.
The chat and Email windows not appear in Finesse Desktop when I put it in Ready status.I'm working in a lab to integrate UCCX with CCP 12.5 but the windows of email and chat do not appear, it only says "there are no chat and mail active in a white backgro...
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