Dhcp Option 42, Option 2 And Option 100; Dhcp Option 12; Dhcp Option 12 Hostname Configuration - Yealink SIP-T2 Series Administrator's Manual

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
option>option 66 (identify the TFTP server)>option 43.
The IP phone can obtain the Auto Configuration Server (ACS) address by detecting option 43 during startup.
To obtain the server address via DHCP option, make sure you have configured the DHCP option on the phone. The
option must be in accordance with the one defined in the DHCP server.
Note
If you fail to configure the DHCP options for discovering the provisioning server on the DHCP server, an alternate method
of automatically discovering the provisioning server address is required. One possibility is that connecting to the secondary
DHCP server that responds to DHCP INFORM queries with a requested provisioning server address. For more information,
refer to RFC 3925 . If a single alternate DHCP server 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 pro-
cess 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 RFC 2132). See RFC 1035
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
Description It configures the DHCP Option 12 Hostname on the IP phone.
Permitted
String within 99 characters
Values
For T54S IP phones: SIP-T54S.
Default For T52S IP phones: SIP-T52S.
For T48G IP phones: SIP-T48G.
30
for character set restrictions.
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<y0000000000xx>.cfg