I'm trying to integrate CUCM 8.6 / CUC 8.6 with a CS1000 Release 3.0 in my lab environment, and have hit a snag. Calls pass perfectly between Cisco and Nortel phones, and Nortel phones have no problem dialing out to the PSTN through the CUCM. The issue is forwarding to voicemail. The phones are sent to hunt/fdn to the VM pilot number 4000. If I dial the pilot number from a Nortel phone with a mailbox configured it prompts to log in and knows which mailbox to use. If I call a Nortel phone from a Nortel phone, Unity picks up and lets me leave a message for that mailbox. The problem is calls from Cisco phones to Nortel phones, and calls from the PSTN to Nortel phones get dumped into the generic Unity pilot, as if it doesn't know the mailbox to be used. I did a little experiment by forwarding a Nortel phone to a softphone instead of the voicemail pilot and calling it from both the PSTN and a Nortel set. When calling from a Nortel set, the caller ID shows up as "Forwarded for 5106" (which is what Unity would like to see I assume) but when called from the PSTN it shows "Forward +18028687317 For 8189975105" This is interesting because the "for" part does include the DN of the phone, but it's prefixed with what I can only assume are random numbers. I've played around with all of the settings I can find in CUCM involving forwarding with no luck. Has anyone come across this before and could offer a little advice?