If you get a message on your phone LCD screen "High Traffic Try Again Later" with no dial tone you can try the below solution:
Solution:
The High Traffic Try Again Later error message that appears on the IP Phones indicates this issue:
Whenever the LowPriorityQueueThrottlingFlag Cisco CallManager service parameter is set to TRUE and the Low Priority queue is over the limit specified by the LowPriorityQueueThrottlingMaxCount Cisco CallManager service parameter, the High Traffic Try Again Later error message appears on the LCD display of any IP Phone that is registered to this Cisco CallManager server and that attempts to go off-hook and make a new call. By default, this message appears on the phone if the Low Priority queue gets deeper than 20 signals.
Generally, the Cisco CallManager works fine as long as the Low Priority queue does not get higher than 100. Therefore, if you never see the Low Priority queue go higher than 75, you can configure the LowPriorityQueueThrottlingMaxCount = 100 Cisco CallManager service parameter in order to overcome this issue.
Solution:
The High Traffic Try Again Later error message that appears on the IP Phones indicates this issue:
Whenever the LowPriorityQueueThrottlingFlag Cisco CallManager service parameter is set to TRUE and the Low Priority queue is over the limit specified by the LowPriorityQueueThrottlingMaxCount Cisco CallManager service parameter, the High Traffic Try Again Later error message appears on the LCD display of any IP Phone that is registered to this Cisco CallManager server and that attempts to go off-hook and make a new call. By default, this message appears on the phone if the Low Priority queue gets deeper than 20 signals.
Generally, the Cisco CallManager works fine as long as the Low Priority queue does not get higher than 100. Therefore, if you never see the Low Priority queue go higher than 75, you can configure the LowPriorityQueueThrottlingMaxCount = 100 Cisco CallManager service parameter in order to overcome this issue.
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