Call forward to another users voicemail

Question

Here is the scenario, i cannot find a way to accomplish this.
i am using CUCM 8.5 and Unity Connection 8.5
here is the requirement
1. User1 call forwards her phone to User2
2. A call comes in to User1, the call is forwarded to User2
3. If User2 is unavailable, the call is redirected to User2 voicemail.
The default behaviour is that if User2 does not answer, the call is redirected to the original called number (User1)
I have created forwarded routing rules in Unity connection and i can get the call to end up at User2 voicemailbox however, the user requires that this happens only when the call is forwarded manually. For example, if i call User1 and let it go to Voicemail, it will still go to User2
They want that it goes only to the User2 voicemail only in the specific circumstance that the phone is in call forward mode, not by letting it go to voicemail
Does it make sense?
I think my users are asking too much

Answer 1

Hi Steven,
I'll just add a note to the great tips from Hailey & Roger (+5 each!)
I thought this was an interesting question, so I tried a number of ways
to see if this could be done
The problem, as you've discovered, is that the original Forwarded CLID
is so "sticky" as to render most of the standard routing methods moot.
In my tests I was trying to route calls that come into 7001 and are CFWDALL
to 5126 to route to the 5126 mailbox without changing the Originally dialed
to last redirecting setting (as nicely noted by Hailey).
I had to put in a mid-point number that was set to CFWDALL (via PSTN)
back to the second number.
So I setup a CTI-RP on a phantom (non-DID) DN of 4241 and set the CFWDALL
to 5126. I could then CFWD from 7001 to 4241 which then routed to 5126 with
the CLID stripped off and would then give us the desired results. No other method
that I could come up with would work.
Cheers!
Rob
"Why not help one another on the way" - Bob Marley