User manual

A: You can use the BLF feature to monitor a specific user for status changes on the phone.
For example, you can configure a BLF key on the phone for monitoring the status of a
friend’s phone (busy or idle). When the friend picks up his phone to make a call, the BLF key
(memory key) LED illuminates solid red on your phone to indicate that the friend’s phone is
in use and busy.
For more details, you can refer to the user manual.
http://www.yealink.com/Upload/Version/T2XV70/Yealink_SIP_T28P_User_Guide_V70.pdf
31. Q: How can the phone support keep using the headset?
A: There is a feature called headset prior feature under the phone->feature page, by enable
this feature, the headset light will be on, when talking, the voice will be transmitted through
the headset, if you press the speaker button, you can change the voice channel, but after the
call is finished the headset light will be still on , even you reboot the phone.
If you press the headset again, it will disable this feature.
IP Phone Installation/Upgrade
1． Q: Where can I find the latest firmware?
A: You can find the latest firmware for every model on our website, for example, you can
find the latest firmware of T28P as below:
http://www.yealink.com/SupportDownloadfiles_detail.aspx?CateId=184&flag=142
2． Q: How many expansion modules can be connected to T28\T26\T38?
A: You can connect at most six extension modules to T28\T26\T38.
Note, when you connect 3 expansion modules to the phone, you need to connect one more
adapter to the third extension module.
3． Q: What will happen if I connect both POE cable and power adapter? Who has the priority?
A: The ones manufactured before January 2010 use the power adapter prior, while
afterwards the phones use POE prior.
4． Q: Why the phone can’t upgrade successfully?
A: The below items may cause this issue, please check
1.
Target firmware is the same as current used firmware.
2.
Target firmware is not applicable for the model.
3.
Current or target firmware is protected.
Please select the applicable and authorized firmware for upgrade according to firmware
naming rule.
Yealink firmware naming rule:
T28:2.x.x.x.