Hi guys,
We have a key on some phones set as a Message Waiting Indicator button for a Nupoint MB. When there is one message sitting on the MB, the users are able to select this, enter the PIN and check the message. However, if a second unread message comes in and stacks on top then this button can no longer be pushed. It illuminates the key to show a new message waiting but selecting it does nothing, the same as it would if there were no messages.
There is definitely unread messages sitting in the mailbox, and they are not call back messages.