It sounds like the Cell that your phone is connected to is having problems with its network connection.
Quote:
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when a cell within the a network is isolated due to a link outage Sepura terminals will indicate to the user that the cell is in Fallback mode and will try and register on a cell that it can see that is still connected to the network, ensuring the best possible service whenever possible.
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From:
http://66.102.9.104/search?q=cache:E...FALLBACK&hl=en
If you can tell us the model number of the phone we might be able to help more. Apart from that all I can suggest is that you switch the phone off and back on again, this may force it to register to a nother Cell. You should find that the situation resolves itself though, once they've got the network problem sorted.