Is the IP Phone new in your environment? For how long has it been in your network?
There is a pool of 534 phones CP-6941. Since January 2014, as i mentioned.
How much power does it consume?
IEEE 802.3af PoE. So i guess 15.4 Wt max?
Did you try to change the IP Phone to another port?
Yes, client did it lots of time
Did you change the cabling?
No, but there are 534 phones, and every day 2-4 of them are cutting Lenovo monoblock out of VMware network resources.
Is it a Cisco Switch? How much power can it give to the endpoints? How much power there is left?
Yes, L3. Cisco WS-C4510R+E and Cisco WS-C3560X-48P-E. I still wait for exat configs of these switches. But saw that WS-C3560X-48P-E got 715 Wt total. So if all the ports are busy, it's 14.89 Wt each. Cisco WS-C4510R+E i will clarify which power supply is inside.
By the way we should considerthat when phone reboots it spends more power to restart.
C6941 IP Phones are PoE Class B phones and they consume around 7 Watts.
The fact that your switch has a 715 W PS (PS = Power Supply) doesn't mean that those 715 W are exclusive for PoE. A 715 W PS just give a maximum of 435 W. See the following link for more info and search for the C3560X-48P-E:
Before giving you more recommendations I want to know something else:
Firmware version of the IP Phone
In the CUCM, go to System > LDAP, LDAP Authentication, then check if the "Use LDAP Authentication for End Users" is marked
In the CUCM, go to System > LDAP, LDAP Directory, then check the schedule for the LDAP Synchronization
Another thing you can do to make sure the authentication is working fine between the phones and the AD is to change the password of a user and AD, then at the phone you can try entering the new password and see if you can log in.
Sorry for the delay. The work got me busy for a while.
I recommend to upgrade to the SR1 firmware version. I found some documentation that says an issue in your current firmware version when a user logs in while a multicast flooding is present in the network. I don't know if it's your case but it's good to try this first.
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