UCC Mobility today on ringing the cell phone asks for a touchtone from the recipient to prevent call going to the cell phone voice mail.
Is your customer using digital or analog FXO trunks for the call to the Cell phones? FXO does not have good signaling, where digital trunks should give UC500 info if call is answered by user or cell VM.
We do need to improve this basic feature a bit....
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...