Just a couple of guesses:

Have you configured the switch to supply a VLAN trunk to the phone?
Yes

Since the phone lets you configure actual tagging, that's what it
needs; if you've just enabled VLANs on the switch, and placed the port
the phone is on in a specific VLAN, the phone should not have tagging
enabled.
Exactly, both phone and the switch are configured to use tagging and to use the same VLAN #


If you've got the switch doing trunk mode on that port, and the phone set up to use the right VLAN within the trunk, are you perhaps using a Cisco switch, and have accidentally set it up to use ISL encapsulation (Cisco's proprietary method) on the trunk? The phone does 802.1Q, so Cisco switches need "switchport trunk encapsulation dot1q" on the trunking interface.
No, I am using the HP Pro Curve, Haven't tried Cisco yes but I woul assume that my switches are operating just fine

Thanks,
Wojtek


I have the same problem with VLAN and Grandstream BG phone.
I am using HP switches.
There is a bug in the firmware of the phone, Grandstream tech. knows about it already.


B.

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