Polycom SOUNDPOINT SIP 2.2.0 - Manual (Page 239)

Miscellaneous Administrative Tasks
C - 15
— VLAN IDs may be decimal, hex, or octal
For example:
The following DVD strings will result in the phone using VLAN 10:
VLAN-A=10;
VLAN-A=0x0a;
VLAN-A=012;
The following figure shows the phone’s processing to determine if the VLAN
ID is valid:
Note If a VLAN tag is assigned by CDP, DHCP VLAN tags will be ignored.