Dhcp Option 42, Option 2 And Option 100; Dhcp Option 12 - Yealink T54S Administrator's Manual

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series IP Phones
Note
that connecting to the secondary DHCP server that responds to DHCP INFORM queries with a requested
provisioning server address. For more information, refer to
responds, this is functionally equivalent to the scenario where the primary DHCP server responds with a
valid provisioning server address. If no DHCP server responds, the INFORM query process will retry and
eventually time out.
Related Topic
DHCP Provision Configuration

DHCP Option 42, Option 2 and Option 100

Yealink IP phones support using the NTP server address offered by DHCP.
DHCP option 42 is used to specify a list of NTP servers available to the client by IP address. NTP servers
should be listed in order of preference.
DHCP option 2 is used to specify the offset of the client's subnet in seconds from Coordinated Universal
Time (UTC).
DHCP option 100 is used to specify the timezone information (time zone and daylight-saving offset). The
priority is as follows: option 100>option 2.
Related Topic
NTP Settings

DHCP Option 12

You can specify a hostname for the phone when using DHCP. The DHCP client uses option 12 to send a
predefined hostname to the DHCP registration server. The name may or may not be qualified with the
local domain name (based on
Topic
DHCP Option 12 Hostname Configuration
DHCP Option 12 Hostname Configuration
The following table lists the parameter you can use to configure DHCP option 12 hostname.
static.network.dhcp_host_name
Parameter
It configures the DHCP Option 12 Hostname on the IP phone.
Description
Permitted
String within 99 characters
Values
For T54S IP phones: SIP-T54S.
Default
RFC 2132). See RFC 1035 for character restrictions.
[1]
RFC 3925. If a single alternate DHCP server
<y0000000000xx>.cfg
16