This was possible in 3.1 using the Voice mail box field from the line configuration when configuring a phone. This redirects a call to voicemail to a different voicemail box number than the line was configured for.
I believe under 3.2 this has been removed and replace with a Voicemail Profile.
Unity will consider the first re-directing ID to be the "fowarding" party, thus try to log into the subscriber mailbox that matches that forwarding ID. With the scenario you describe (A forwards to B, B forwards to Unity), I'd expect Unity to play the greeting of A (given A is a valid Unity subscriber) without any additional configuraiton on CallManager or Unity. You can check the CallViewer.exe utility on the Unity server to get an idea of what's being sent for that first re-directing party.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
endpoints and other SIP related issues. Even though these traces are in
clear text, these texts can be gibberish unless you understand fully
what they mean. This document attempts to br...
Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
questions and it will render the proper jabber-config.xml file for you
to copy/paste. There is built in logic to verif...
[toc:faq]CUCM Database Replication is an area in which Cisco customers
and partners have asked for more in-depth training in being able to
properly assess a replication problem and potentially resolve an issue
without involving TAC. This document discusse...