Polycom SIP 3.1 manual Parsing Vendor ID Information

Administrator’s Guide SoundPoint IP / SoundStation IP

The following figure shows the phone’s processing to determine if the VLAN

ID is valid:

Parsing Vendor ID Information

After the phone boot, 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

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