I am very familiar with CUCM, CUC and alternate extensions. However, when i configure call forward all for UC540, its able to reach the ip phone but when theres no answer, the caller gets the there is no mailbox associated to that extension. From what i have read, CUE is seeing the caller is trying to leave a voicemail for 2004 but is in 2017 voicemail profile. Is there a translation rule i am missing?
Configure Multicast Paging on the Cisco IP Phone 7800 Series or 8800 Series Multiplatform Phone
The Cisco IP Phone 7800 and 8800 Series Multiplatform Phones provide voice communication over an Internet Protocol (IP) network...
Add Call Park on a Cisco 7800 or 8800 Series Multiplatform Phone Key Expansion Module
Call park allows the user of the phone to put an incoming call on hold so that the call can be retrieved on another phone. A call is park...