Yealink CP860 [31/417] Dhcp option

Yealink CP860 [31/417] Dhcp option
Getting Started
19
phones comply with the DHCP specifications documented in RFC 2131. If DHCP is used,
IP phones connected to the network become operational without having to be manually
assigned IP addresses and additional network parameters. Static DNS address(es) can
be configured and used when DHCP is enabled.
DHCP Option
DHCP provides a framework for passing information to TCP/IP network devices. 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.
DHCP can be initiated by simply connecting the IP phone with the network. 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 IP phones.
Parameter
DHCP Option
Description
Subnet Mask
1
Specify the clients subnet mask.
Time Offset
2
Specify the offset of the client's subnet in
seconds from Coordinated Universal Time
(UTC).
Router
3
Specify a list of IP addresses for routers on the
clients subnet.
Time Server
4
Specify a list of time servers available to the
client.
Domain Name
Server
6
Specify a list of domain name servers
available to the client.
Log Server
7
Specify a list of MIT-LCS UDP servers
available to the client.
Host Name
12
Specify the name of the client.
Domain Server
15
Specify the domain name that client should
use when resolving hostnames via DNS.
Broadcast
Address
28
Specify the broadcast address in use on the
client's subnet.
Network Time
Protocol
Servers
42
Specify a list of the NTP servers available to
the client by IP address.
Vendor-Specific
Information
43
Identify the vendor-specific information.

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