Administrator’s Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones
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DHCP Option 42, Option 2 and Option 100
Yealink 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
DHCP Option 12
You can specify a hostname for the phone when using DHCP. The DHCP client uses option 12 to send a pre-
defined hostname to the DHCP registration server.
See
for character set restrictions.
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.
Parameter
static.network.dhcp_host_name
[1]
<y0000000000xx>.cfg
Description
It specifies a hostname for the phone when using DHCP.
Permitted
Values
String within 99 characters
Default
For T57W phones: SIP-T57W
For T54W phones: SIP-T54W
For T53W phones: SIP-T53W
For T53 phones: SIP-T53
For T48U phones: SIP-T48U
For T48G phones: SIP-T48G
For T48S phones: SIP-T48S
For T46U phones: SIP-T46U
For T46G phones: SIP-T46G
For T46S phones: SIP-T46S
For T43U phones: SIP-T43U
For T42G phones: SIP-T42G
For T42S phones: SIP-T42S
For T42U phones: SIP-T42U
For T41P phones: SIP-T41P