My message button is flashing on my Toshiba DKT2020SD phone, telling me i have a message. When i press the Msg button, it it calls another phone extention in another office and i hear that it is on speaker in that office

This is what I wrote up for our inhouse manual on telephone administration for this phone:

Problem: An employee pushes the Message button to receive a message but it calls someone else's desk. This is caused by whichever extension the phone forwards to when pushing the Message light. For example: if the person at 333 pushes their blinking message light and it forwards to 316 that means that the person at 316 most likely tried to call 333, got a busy signal and accidentally pushed the Message button before hanging up thus setting 333 to call forward to their extension when they got off the phone.

All phones on our system should have this feature turned off, but if it happens this is the two step process to resolve the issue:

Solution: First, push the Message button to figure out which extension it is forwarding to. Take note of the extension and hang up. With the hand set NOT picked up, dial #409 and Release. You may have to do this multiple times to clear the call forwarding because it needs to be done for each incidence that the person accidentally set up call forward. Finally, in the management software go to Station > Station Assignments. Select the extension # that the Message button was forwarding to (the one you noted above). Under the Basic tab at #41 Active Message Waiting select Disable. Select Submit.