Yealink SIP-T31G Administrator's Guide

General Features
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General Features
This section shows you how to configure general features on Yealink phones.
Topics
Line Identification Presentation
Return Code for Refused Call
Return Code for Unanswered Call
Hide Feature Access Codes
Accept SIP Trust Server Only
100 Reliable Retransmission
SIP Session Timer
Session Timer
Reboot in Talking
Reserve # in User Name
Busy Tone Delay
CFG File Version Information
Media Loopback
Cloud
Line Identification Presentation
Yealink phones can derive calling and connected line identification from SIP headers and display the name asso-
ciated with the telephone number on the LCD screen.
Calling Line Identification Presentation (CLIP): It allows the phones to display the caller identity, derived from a SIP
header contained in the INVITE message when receiving an incoming call. Yealink phones can derive caller iden-
tity from three types of SIP header: From, P-Asserted-Identity (PAI) and Remote-Party-ID (RPID). Identity present-
ation is based on the identity in the relevant SIP header.
Connected Line Identification Presentation (COLP): It allows the phones to display the identity of the connected
party specified for outgoing calls. The phones can display the Dialed Digits, or the identity in a SIP header (Remote-
Party-ID, P-Asserted-Identity or contact) received, or the identity in the From header carried in the UPDATE mes-
sage sent by the callee as described in RFC 4916. Connected line identification presentation is also known as
Called line identification presentation. In some cases, the remote party will be different from the called line iden-
tification presentation due to call diversion.
Note: If the caller/callee already exists in the local directory, the local contact name assigned to the caller will be pref-
erentially displayed and stored in the call log.
For more information on calling line identification presentation, refer to Calling and Connected Line Identification
Presentation on Yealink IP Phones.
Topic
CLIP and COLP Configuration
CLIP and COLP Configuration
The following table lists the parameters you can use to configure the CLIP and COLP.
Parameter
account.X.cid_source
[1]
<MAC>.cfg
Description
It configures the identity of the caller.
Permitted
Values
0-FROM
1-PAI
2-PAI-FROM

Yealink SIP-T31G Specifications

General

Mounting kit	Yes
Number of handles included	1 pc(s)
Display diagonal	2.3 \
Display resolution	132 x 64 pixels
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Voice codecs	G.722, G.729, AGC, G.729A, AJB, PLC, G.711Mu, VAD, G.711a, G.723.1, G.726, iLBC, CNG, OPUS
AC adapter input voltage	100 - 240 V
AC adapter output current	0.6 A
AC adapter output voltage	5 V
Power consumption (typical)	3 W
Lines quantity	2 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	2
Sustainability certificates	RoHS, REACH
Networking standards	IEEE 802.3af, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1x
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Ethernet LAN interface type	Gigabit Ethernet
Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Gray
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	189 mm
Width	188 mm
Height	162 mm
Package depth	210 mm
Package width	213 mm
Package height	103 mm