Yealink T48G, Administrator'S Manual

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Administrator’s Guide for SIP-T2 Series/T4 Series/T5 Series IP Phones
4
Updating Firmware
If you define the access URL of firmware in the configuration file, the IP phone will download firmware
from the provisioning server. If the MD5 value of the downloaded 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 firmware from the provisioning
server.
Downloading the Resource Files
In addition to 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 following steps:
1.
The power LED indicator glows red.
2.
The message “Welcome Initializing… please wait” appears on the LCD screen when the IP phone
starts up.
3.
The main LCD screen displays the following:

Time and date

Soft key labels
4.
Press the OK/
√
key or press Menu->Status to check the IP phone status, the LCD screen displays
the valid IP address, MAC address, firmware version, and so on.
If the IP phone has successfully passed through these steps, it starts up properly and is ready for
use.