Yealink SIP-T2 Series User Manual

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series IP Phones
928
Why doesn’t the IP phone upgrade firmware successfully?
Do one of the following:
 Ensure that the target firmware is not the same as the current firmware.
 Ensure that the target firmware is applicable to the IP phone model.
 Ensure that the current or the target firmware is not protected.
 Ensure that the power is on and the network is available in the process of upgrading.
 Ensure that the web browser is not closed or refreshed when upgrading firmware via web
user interface.
How can I verify the firmware generation and version of the phone?
Press the OK/√ key when the IP phone is idle to check the firmware version. For example:
28.81.0.20.
Item
Description
1
28
Firmware ID.
The firmware ID for each IP phone model is:
 35: SIP-T48G
 28: SIP-T46G
 66: SIP-T48S/T46S/T42S/T41S
 29: SIP-T42G
 36: SIP-T41P
 54: SIP-T40P
 76: SIP-T40G
 46: SIP-T29G
 45: SIP-T27P
 69: SIP-T27G
 44: SIP-T23P/G

Yealink SIP-T2 Series Specifications

General

Brand	Yealink
Model	SIP-T2 Series
Category	IP Phone
Language	English