We have 2x SPA122.
Both are connected to a CE500 switch where the voice voice VLAN is set to vid 6 and CDP is enabled.
The first SPA122 is configured to enable CDP and DHCP successfully allocates it a lease in our vlan 6 subnet.
The second SPA122 is configured exactly the same but it does not receive an IP address in the voice vlan. It only works when CDP is disabled and then it gets an IP address for our PC vlan (vlan 1)
Firmware is the same on both (1.3.3). I tried 1.3.5 (latest) but that didn't help.
I've tried disabling CDP and setting the vlan on the SPA122 manually. That didn't help.
Tried factory resetting the device several times.
There are plenty of spare IP addresses available in the DHCP scope.
I've tried plugging it into an alternative switchport - it didn't help.
All switch ports except the trunk port are configured with the Phone+PC smartports role
Both SPA 122 devices are setup with bridged networking and the Internet port connected to the switch. The other port in not occupied.