Mobile Voice Access (MVA) is a feature that allows authorized users to call into an assigned UMD number, enter a PIN, then route a new call through the PSTN (public switched telephone network). Their displayed calling number would be masked with their Single Number Reach extension so the called party sees the caller's office number.
If you haven’t already, log in to the Cisco Self-care Portal and set up the following services:
For example, if attempting an outgoing call to 301-555-1212: Dial 301 405 5555 -> ** if not recognized** your mobile number# set up in SNR -> Your PIN -> 1 -> 93015551212#.