I would like to share with you following problems:
The problem we still have is that some 7925 phones get stuck with the display saying “Konfiguriere IP” sometimes, I believe it is related to the renewing of the IP with the DHCP server.
The only problem is that the phones sometimes lose their IP, so it’s only DHCP to look at. The phones are simple DHCP clients, the WLC is transparent for the DHCP.
here is config:
ip dhcp pool VOIP
network 172.25.0.0 255.255.0.0
dns-server 172.24.1.101 172.24.1.100
option 150 ip 172.25.0.21 172.25.0.20
ip address 172.25.0.1 255.255.0.0
The phones also seem to recover after some time, so they don’t know that it happened. Unfortunately we don’t know which phone is when affected. We just changed the phones to b/g only and EAP-FAST but it seems that makes no difference.