I Just want to know the cost to have this Umobility feature working for 8 user? hardware? License?
You need a advanced IP license for each user (about $ each).
The customer will need to have a firewall capable of a VPN connection for each user (at least 8 in your case).
Then you'll have quite a bit of setup time involved, that will depend on the technician that's doing the install.
I set it up in my office on 2 Android devices and on 2 Apple devices in about 2 hours. We already had the firewall and licenses.