OT:CME Problem (Phones keep restarting)

Dear Gents,

I have a problem that a customer every now and then has the phones
restarting

%IVR-3-LOW_CPU_RESOURCE : IVR: System experiencing high cpu utilization
([dec]/100). Call (callID=[dec]) is rejected.

Explanation System does not have enough CPU resources available to accept
a new call

Recommended Action Ensure that the call setup rate is within the
supported capacity of this gateway.
When checking the logs this is the message I am receiving and I checked its
explanation from Cisco.

When checking the CPU, this is what I notice. Can someone advise please?

     9 999990
    6596649565789989990
100 * ******
 90 * ******
 80 * ******
 70 * ******
 60 * ******
 50 * ******
 40 * ***#**
 30 * ***#**
 20 # #**##*
 10 **#** *******######
   0....5....1....1....2....2....3....3....4....4....5....5....6....6....7..
             0 5 0 5 0 5 0 5 0 5 0 5 0
                   CPU% per hour (last 72 hours)
                  * = maximum CPU% # = average CPU%

Thanks

-- 
KJ
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