[cisco-voip] IP Phones showing "High Traffic Try Again Later"

[Cucumber Green]

On one of our Call Manager clusters (4.2(3)sr2),  phones show the message "High Traffic Try Again Later" and the user can not place a call.
   
  I have tried looking up this error message without any luck. :(
   
  Has anyone come across this?
   
  P.D. This cluster serves a CRS server. There are only 7940 phones.

       
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