CUCM and 8961 some phones are slow/delayed or do not react when a button is pressed
I have this symptom on some phones.
When a button is pressed, for example the settings button, the phone does nothing. Also when I try to dial a number. After a few seconds the pressed buttons are executed delayed. After a reset of the phone, the problem is gone for a while.
We are using CUCM 126.96.36.19900-28 and the firmware sip8961.9-3-4-24
Symptom: Users may notice delayed response on the phone display when pressing keys, especially when dialing. Users may also briefly notice an extended delay when pressing buttons after the phone has been idle for an extended period.
Conditions: Using 8961/99XX series phone
Workaround: Enable Simplified New Call UI to improve responsiveness when dialing.
If the issue persists after trying the workaround then further details are required like:
Is the issue affecting all 8961's?
Does the issue go away if you try to upgrade or downgrade the firmware?
I have this problem with 8851 with CUCM 10.5.2.11900-3 and sip88xx.11-0-1-11. The issue is intermittent. A phone reset clears it up but only temporarily. Problem was there with sip88xx.10-2-2-16 firmware also. Applied UI adjustment as described. Waiting for results.
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