I have two DHCP servers, CNR (release 6.2)& Windows DHCP server.
Using the windows DHCP server (via a helper command) I can plug any model phone into the same port and they will be assigned an address from the correct scope.
Changing the helper command to use the CNR server results in the same behavior except that 7970 phones will not accept the address offered by the CNR server. All other phones & laptops work ok. Tried 3 different 7970s, upgraded firmware, ensured previous address was released, factory reset etc . All requested fields are offered to the client.
Only error i can find is in the 'console logs'....
07:20:13.344729 DHCP: select times out