Yealink T48G, Administrator'S Manual

Page: 23 / 622

Getting Started
3
Updating Firmware
Downloading the Resource Files
Loading the ROM File
The ROM file resides in the flash memory of the IP phone. The IP phone comes from the factory with a
ROM file preloaded. During initialization, the IP phone runs a bootstrap loader that loads and executes
the ROM file.
Configuring the VLAN
If you connect the IP phone to a switch, the switch notifies the IP phone of the VLAN information defined
on the switch (if using LLDP or CDP). The IP phone can then proceed with the DHCP request for its
network settings (if using DHCP).
Querying the DHCP (Dynamic Host Configuration Protocol)
Server
The IP phone is capable of querying a DHCP server.
After establishing network connectivity, the IP phone can obtain the following network parameters from
the DHCP server during initialization:

IP Address

Subnet Mask

Default Gateway

Primary DNS (Domain Name Server)

Secondary DNS
By default, the IP phones obtain these parameters from a DHCPv4. You can configure network
parameters of the IP phone manually if any of them are not supplied by the DHCP server.
Contacting the Provisioning Server
If you configure the IP phone to obtain configurations from the provisioning server, it will be connected
to the provisioning server, and then download the boot file and configuration file(s) during startup. The
IP phone will be able to resolve and update configurations written in the configuration file(s). If the IP
phone does not obtain configurations from the provisioning server, the IP phone will use the
configurations stored in the flash memory.