While the phone lines are down, Berkshire Healthcare NHS Foundation Trust advise people to use the following emergency contact numbers:
Charles Ward: 07843 880977.
Henry Tudor Ward: 07593 511804.
Rapid Assessment Community Clinic: 07768 546448.
To contact one of the other other services based at St Mark's, call the site services team on 07795 684977.
The trust says it is 'investigating the fault and will have the lines repaired as soon as possible'.
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The victim of an assault in Cippenham was flown to hospital by air ambulance this afternoon.
A rapid response vehicle, an ambulance officer, an air ambulance and an ambulance crew were all called to an address in Earls Lane at 2.10pm.