Are you talking about the display on the phone? If so, take a look at the following CallManager service parameters:
Call Park Display Timer : This is a generic timer which provides the flexibility to change the duration of Call Park Number display and other notification displays on the IP phone. A value of 0 causes the message to be displayed until it is overwritten by another message of equal or higher priority. Specify a value that is less than or equal to the value that is specified for the Call Park Reversion Timer service parameter; if the value is not less, the call park display will be overwritten after the call park reversion time expires. This parameter applies to Cisco IP Phone models 7940, 7960, and newer.
This is a required field.
Call Park Reversion Timer : This parameter specifies the number of seconds to wait before returning a parked party to the user who parked the call. Make sure that the Call Park Display Timer value is less than or equal to the value that is specified for the Call Park Reversion Timer; if it is not, the call park display will be overwritten after the call park reversion time expires.
current call park display timer is set to 60, the call park reversion timer is set to 300. The problem seems to be when a new call comes in the parked call display number is replaced by the new incoming call, and our secretary can not locate the parked call.
Have you tried playing with the Setting "Auto Line Select"? If this Setting is set to true the Call Focus on the display will always shift to the new incoming call. I can't test this with Call Park because we don't use Call Park, but its worth a try.
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