Hi, we've deployed the 8851s on one or our sites, and we're having the same problem. The receptionist's phone, which has an expansion module is the worse of all. She complains about having to reboot the phone once a day at least because the screen goes dark and does not come on, or the phone is just unresponsive. She now is saying that the keys on the KEM are not showing the line state, and if it does it takes a long time to update. Phones are on firmware sip88xx.10-3-1-20, I don't think the KEM can be updated separately. Not sure what to do next, the end users are not feeling very excited about the daily reboots...
It looks like there was no real fix in this thread - we now have phones running 11(5)1 experiencing similar issues and are struggling to pinpoint the issue or find a fix...
Just an update... We have determined the new 8845 phones, new DMPs and newer APs are all doing the same thing. Locking up and will not respond and the only thing that will bring them back on line is a shut or no shut.
Older phones, older APs are not experiencing any issues at all.
I'll get back with the exact model numbers of the DMPs and APs.
For what it worth, my 8851 et 8861 are still OK to this day.
I'm still running my 8851 with 1 8800 module and Bluetooth enable to connect my Nexus 6p phone. I have a Plantronics hw251 headset.
Same issue here we using 8841 phones on firmware sip88xx.11-5-1-18. Phones will Freeze. Screen is on but non responsive. Only way to fix is to unplug POE and back in. This happened on previous firmware as well.
TAC case is logged with Cisco but still no solution. Switches were suspected but full health check was done and nothing wrong with the Switches.
Same issue here with 8845 phones, DMPs and our AIR-CAP2602E-A-K9 aps. Older aps and 6921s, 9971s are not locking up. The only way to restore service is a shut and no shut or unplug the device and reconnect it.
Yup same issue here in our contact center. Most are using headsets. Running firmware 11-5-1-18. Anyone heard anything more on this? Thank you.