Parsing Vendor Id Information - Polycom IP 320 Administrator's Manual

Administrator's Guide for the SoundPoint IP / SoundStation IP / VVX Family

Parsing Vendor ID Information

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The following figure shows the phone's processing to determine if the VLAN
ID is valid:
After the phone boots, it sends a DHCP Discover packet to the DHCP server.
This is found in the Bootstrap Protocol/option "Vendor Class Identifier"
section of the packet and includes the phone's part number and the BootROM
version. The format of this option's data is not specified in RFC 2132, but is left
to each vendor to define its own format. To be useful, every vendor's format
must be distinguishable from every other vendor's format. To make our
format uniquely identifiable, the format follows RFC 3925, which uses the