Yealink SIP- T28P User Manual

User Guide for the SIP-T28P IP Phone
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How to obtain the MAC address of a phone when the phone is not powered on?
Three ways to obtain the MAC address of a phone:
 You can ask your supplier for the shipping information sheet which includes MAC
addresses according to the corresponding PO (Purchase Order).
 You can find the MAC address on the label of the carton box.
 You can also find the MAC address from the phone’s bar code on the back of the
phone.
Why can’t I get a dial tone?
 Check for any loose connections and that the phone has been installed properly.
For the installation instructions, refer to Phone Installation on page 11.
 Switch between the Handset, Headset (if present) or Hands-Free Speakerphone to
check whether the dial tone is present for one of the audio modes.
If the dial tone exists on another audio mode, connect a different handset or
headset to isolate the problem.
Why doesn’t the phone ring?
Check that the ringer volume on the phone. To adjust the ringer volume setting, press
the Volume key when the phone is idle. For more information, refer to Volume on page
28.
Why can’t I receive calls?
 Check that the SIP registration with your system administrator.
 Check that the DND (Do Not Disturb) mode is deactivated on the phone. Refer to Do
Not Disturb (DND) on page 84.
 Check that call forward is disabled on the phone. Refer to Call Forward on page 88.
 Check whether the caller number is stored in the blacklist directory. Refer to Blacklist
on page 44.
Why is my handset not working?
Check that the handset cord is fully connected to both the handset jack on the phone
and handset. Refer to Phone Installation on page 11.
Why is my headset not working?
 Check that the headset cord is fully connected to the headset jack on the phone.
Refer to Phone Installation on page 11.
 Check that the headset mode is activated. Refer to Headset Mode
Activation/Deactivation on page 51.

Yealink SIP- T28P Specifications

General

Expansion module support	Yes
Ethernet LAN (RJ-45) ports	2
Keypad number of keys	48
Voice codecs	G.711, G.722, G.723.1, G.726
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Touchscreen	-
Display resolution	320 x 160 pixels
Lines quantity	- lines
Phonebook capacity	- entries
Number of VoIP accounts	6
Bluetooth	No
Security algorithms	HTTPS, SSL/TLS
AC adapter input voltage	100 - 240 V
AC adapter output voltage	5 V
Power consumption (typical)	2.6 W
Operating relative humidity (H-H)	10 - 95 %
Compliance industry standards	IEEE 802.3af
Number of handles included	1 pc(s)

Weight and Dimensions

Depth	204 mm
Width	273 mm
Height	42 mm
Weight	1050 g