This section describes how to configure the basic network parameters that are required
for the IP phones to operate in the network.
DHCP (Dynamic Host Configuration Protocol) is a network protocol used to dynamically
allocate network parameters to hosts connected to a network. The automatic
distribution of network parameters to hosts eases the administrative burden of
maintaining IP networks. The IP phones comply with the DHCP specifications
documented in RFC 2131. If using DHCP, the IP phones connected to the network
become operational without having to be manually assigned IP addresses and
additional network parameters. By default, DHCP is enabled on the IP phones.
DHCP Option
DHCP provides a framework for passing network information to devices on a TCP/IP
network. Network and other control information are carried in tagged data items that
are stored in the options field of the DHCP message. The data items themselves are also
called options.
When the IP phones are simply plugged into the network, the DHCP process begins. The
IP phones broadcast DISCOVER messages to request the network information carried in
DHCP options and the DHCP server responds with the specific values in the
corresponding options.
The following table lists the common DHCP options supported by the IP phones.
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