The South Western Ambulance Trust are urging people only to call 999 in an emergency in the run up to Christmas.
There have been 23 convictions so far this year of frequent callers who have abused the emergency telephone system.
There are a recorded 2,000 active frequent callers across the South West, most of whom have mental health, substance or social care issues.
The Trust says they can get in the way of them helping patients in urgent and life threatening conditions.
South Western Ambulance Service says it has "resolved" an issue with its telephone system caused by a "major electrical failure".
The incident happened yesterday evening and SWAS says it is still working to restore other systems and work out what caused the failure.
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