Yealink SIP-T4X Administration Manual page 28

DHCP request for its network settings (if using DHCP).
Querying the DHCP (Dynamic Host Configuration Protocol) Server
IP phones are capable of querying a DHCP server. DHCP is enabled on IP phones by
default. The following network parameters can be obtained from the DHCP server
during initialization:
IP Address

Subnet Mask

Gateway

Primary DNS (Domain Name Server)

Secondary DNS

You need to configure the network parameters of IP phones manually if any of them is
not supplied by the DHCP server. For more information on configuring network
parameters manually, refer to
Contacting the auto provisioning server
SIP-T4X IP phones support the FTP , TFTP , HTTP , and HTTPS protocols for auto provisioning
and are configured by default to use TFTP protocol. If IP phones are configured to obtain
configurations from the TFTP server, they will connect to the TFTP server and download
the configuration file(s) during startup. IP phones will be able to resolve and apply the
configurations written in the configuration file(s). If IP phones do not obtain the
configurations from the TFTP server, IP phones will use the configurations stored in the
flash memory.
Updating firmware
If the access URL of the firmware is defined in the configuration file, the IP phone will
download the firmware from the provisioning server. If the MD5 value of the
downloaded firmware file differs from that of the image stored in the flash memory, the
IP phone will perform a firmware update.
Downloading the resource files
In addition to configuration file(s), IP phones may require resource files before it can
deliver service. These resource files are optional, but if some particular features are
being deployed, these files are required.
The followings show examples of resource files:
Language packs

Ring tones

Contact files

Configuring Network Parameters Manually
Getting Started
on page 21.
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