No Dial Tone and the "High Traffic Try Again Later" Error Message Appears

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.

Monitoring UC device using Cisco prime unified operation Manager

Monitoring a UC component is very much essential as this provide the core communication infrastructure in the Enterprise.

Cisco has CUOM to monitor and send notification if any alert happen to the services.

To configure you need to have the device in CUOM device summary under monitored device
if it is not discovered automatically or you can manually the device .(You need to have SNMP string you defined in  UC Server like CUCM and use the same here while adding )

Once the device is in monitired state you can configure to send an alert via email notification.

First step is to do the SMTP configuration in the CUOM Portal to acheive this Go to System >Miscellaneous >Preferences  and mention the SMTP server adddress.

Now move to Administration > Notification >Eventset

Mention the alert which trigger the Event ,There are pre defined event that you need to group to configure an Event set

Now move to Administration > Notification > Notification Criteria

Define the Criteria and mention all the parameter and also follow the wizard to mention the alert notification recepeint IP address (This option will display when you select the email option for notification)

done...

You need to check CUOM is able to connect to SMTP using port 25 .