The issue has now been resolved.
MaxoTel engineers are continuing to monitor the network.
We have dropped the affected provider from our routing and are receiving reports that customers are now able to access their services again. If your phone is still disconnected, please restart it and try again. We will continue to monitor the situation and advise of any updates.
MaxoTel is aware of a connectivity issue affecting some customers ability to connect to our services. We are investigating this issue as a matter of urgency and will update shortly.