Modular Messaging VM User Access

[sirslacker]

We have the latest version of MM recently implemented. Users in a call center with a group mailbox complain that when a new messsage comes in, all of them can access the message at once. This leads to confusion as customers get multiple callbacks. Employees say that under Intuity this was not possible.

Any way to prevent more than one person from accessing a group vm box at the same time?