I'm having an issue with Spa 962 & 942 on fw 6.1.5a. changing vlan.
I trying to auto-provision these phones and that involves changing them from untagged vlan to tagged vlan 21.
The problem is when <Enable_VLAN group="System/VLAN_Settings">Yes</Enable_VLAN> is set via xml or web the phone restarts but after the restart vlan is set to yes but the phone still gets on IP on the untagged vlan! To make issue worse the phone is not accessible on this address and thus can't be restarted remotely. After a manual reboot the phone works as it should, gets a IP from vlan 21 and all is fine.
This issue makes automatic provisioning impossible.
Otherwise the provisioning process spa9x2.cfg -> spa$MA.xml works fine.