i have some problem with my cisco 7940/60 cisco 7940/60 with 8.1(2) firmware would not register to CM 8.6(2)SU3. the problem was the phone is configuring IP and get DHCP server is 255.255.255.255. i tried to upgrade firmware to be 8.1(2)_SR2 and the problem solved. Cisco 7940/60 can register with CM.
Now the problem is reapper. when the 7940/60 phone resetted, the phone is configuring IP and get DHCP server 255.255.255.255 i have checked network and DHCP issue but no problem in there. and when i redowngrade the firmware to 8.1(2) ip phone get their ip address and registered well.
what should i to solve this problem when the problem reappear? is it BUG?
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