Polycom CX5500 Administrator's Manual page 224

Polycom CX5500 Unified Conference Station Administrator's Guide
VLAN Using DHCP Phone Boot-Up Sequence
To assign a VLAN ID to a phone using DHCP:
» In the DHCP menu of the Main setup menu, set VLAN Discovery to Fixed or Custom.
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When set to Fixed, the phone will examine DHCP options 128,144, 157 and 191 (in that order)
for a valid DVD string.
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When set to Custom, a value set in the VLAN ID Option will be examined for a valid DVD
string.
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DVD string in the DHCP option must meet the following conditions to be valid:
Must start with "VLAN-A=" (case-sensitive)
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Must contain at least one valid ID
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VLAN IDs range from 0 to 4095
Each VLAN ID must be separated by a "+" character
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Polycom, Inc.
1.1.0
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