Administrator’s Guide for SIP-T2xP IP Phones
16
DHCP (Dynamic Host Configuration Protocol)
The IP phone is capable of querying a DHCP server. DHCP is enabled on the IP phone
by default. The following network settings 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 IP phone manually if any of the network parameters is not
supplied by the DHCP server. For more information on manually configuring network
parameters, refer to Configuring Network Parameters Manually on page 20.
Contacting the TFTP server
If the IP phone is using the TFTP server to obtain its configurations, there should be a
configuration file or files on the TFTP server that the phone will request and download.
The IP phone resolves and applies the configurations written in the configuration file or
files. In the configuration file or files, SIP parameters that are required by the IP phone to
operate in a SIP VoIP environment are defined. If the phone is not obtaining its
configurations via the TFTP server, the phone will use configurations that are stored in
the flash memory.
Verifying the firmware version
If the phone determines that the firmware version defined in a configuration file differs
from the image it has stored in the flash memory, it performs a firmware upgrade. When
performing a firmware upgrade, the phone downloads the firmware image from the
TFTP server, programs the image into the flash memory, and reboots.
Loading the resource files
The IP phone may require resource files that are used by some of the advanced
features, which are also defined in the configuration file or files. These resource files are
optional, but if the particular feature is being employed, these files are required.
Some examples of resource files include:
Language files
Ring tones
Directories
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