Loading The Rom File; Configuring The Vlan; Querying The Dhcp (Dynamic Host Configuration Protocol) Server; Contacting The Provisioning Server - Yealink SIP-T2 Series Administrator's Manual

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 pre-
loaded. 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
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Subnet Mask
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Default Gateway
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Primary DNS (Domain Name Server)
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Secondary DNS
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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 pro-
visioning 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.

Updating Firmware

If you define the access URL of firmware in the configuration file, the IP phone will download the firmware from the
provisioning server. If the MD5 value of the downloaded the firmware file differs from that stored in the flash memory,
the IP phone will perform a firmware update.
You can manually upgrade firmware if the IP phone does not download the firmware from the provisioning server.

Downloading the Resource Files

In addition to the configuration file(s), the IP phone may require resource files before it provides service. These
resource files are optional, but if you deploy some particular features, these files are required.

Verifying Startup

After connected to the power and network, the IP phone begins the initialization process by cycling through the fol-
lowing steps:
1. The power LED indicator glows red.
2. The message "Welcome Initializing... please wait" appears on the phone screen when the IP phone starts up.
3. The main phone screen displays the following:
Time and date
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Soft key labels
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Getting Started
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