Yealink SIP-T20P User Manual

Advanced Phone Features
85
The SIP-T20P IP phone supports MWI feature when receiving a new voice message. If
someone leaves you a voicemail, you will receive a message waiting indicator. MWI will
be indicated in three ways: a warning tone, the message key LED illuminates solid
green and an indicator message (including a voice mail icon) appears on the LCD
screen. This is cleared only when you retrieve all voice mails or delete them.
For some particular servers, the MWI service is unsolicited. So the SIP-T20P IP phone just
need to handle the MWI messages sent from the server. But for some servers, the MWI
service is solicited. In this case, the SIP-T20P IP phone must enable the MWI Subscription
for MWI messages.
Note
The MWI Subscription parameters you need to know:
Option
Description
Subscribe for MWI
Enable or disable a subscription for MWI service.
MWI Subscription
Period
Period of MWI subscription. The IP phone re-sends a MWI
subscription before expiring.
To enable MWI subscription via web user interface:
1. Click on Account->Advanced>>.
2. Select Enabled from the pull-down list of Subscribe for MWI.
3. Enter the period time in the MWI Subscription Period (seconds) field.
4. Click Confirm to accept the change.
MWI service is not available on all servers. Contact your system administrator for more
information.

Yealink SIP-T20P Specifications

General

Keypad number of keys	31
Speakerphone	Yes
Voice codecs	G.711, G.722, G.723.1, G.726
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black
Touchscreen	-
Lines quantity	2 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	2
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	200 mm
Width	185 mm
Height	90 mm
Weight	770 g