Yealink SIP-T27G Administrator's Guide

Configuration Parameters
529
Values 1-Enabled
Default
0
Parameter
sip.unreg_with_socket_close <y0000000000xx>.cfg
Description
It enables or disables the phone to close the socket immediately when the user deregisters the cor-
responding account(s).
Permitted
Values
0-Disabled
1-Enabled
Default
0
Parameter
account.X.check_cseq.enable
[1]
<MAC>.cfg
Description
It enables or disables the phone to check if the CSeq sequence number in the request is lower than
that in the previous request on the same dialog.
Permitted
Values
0-Disabled
1-Enabled. If the CSeq sequence number in the request is lower than that in the previous request, the
phone will reject the request.
Default
1
Parameter
account.X.check_to_tag.enable
[1]
<MAC>.cfg
Description
It enables or disables the phone to check if the To-tag is carried in the To header in renewal request.
Permitted
Values
0-Disabled
1-Enabled. If the To-tag does not exist, the phone will reject the request.
Default
0
Parameter
features.call_invite_format <y0000000000xx>.cfg
Description
It configures the format of callee field in the INVITE message.
Permitted
Values
0-sip:XXX
1-tel:Number, you need to set “account.X.outbound_proxy_enable" to 1.
Default
0
Parameter
sip.escape_characters.enable <y0000000000xx>.cfg
Description
It enables or disables the phone to convert ASCII code into corresponding symbol.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Case Scen-
ario
Target characters: %5F (escape character % plus the ASCII characters 5F)
1. If you want to convert the ASCII code, set the following:
sip.escape_characters.enable = 1
sip.reserve_characters = %NULL%
Result: The target characters %5F are converted to _.
2. If you do not want to convert the ASCII code, set the following:
sip.escape_characters.enable = 0
sip.reserve_characters = %

Yealink SIP-T27G Specifications

General

Mounting	Desk/Wall
Handset type	Wired handset
Product type	IP Phone
Product color	Black, Gold
Wall mountable	Yes
Display diagonal	3.66 \
Display resolution	240 x 120 pixels
RJ-9 ports quantity	2
USB 2.0 ports quantity	1
Voice codecs	CNG, G.711, G.722, G.723.1, G.726, G.729, G.729ab, VAD, iLBC
Dual-Tone Multi-Frequency (DTMF) modes	SIP info
Lines quantity	8 lines
Phonebook capacity	1000 entries
Number of VoIP accounts	6
Bluetooth	-
Security algorithms	AES, MD5
Networking standards	IEEE 802.1Q, IEEE 802.1p, IEEE 802.1x, IEEE 802.3af
Ethernet LAN interface type	Gigabit Ethernet
Volume control	Digital
Operating temperature (T-T)	-10 - 50 °C
Operating relative humidity (H-H)	10 - 95 %
Cables included	LAN (RJ-45)
Number of handles included	1 pc(s)
Harmonized System (HS) code	85171800

Weight and Dimensions

Depth	210 mm
Width	265 mm
Height	170.5 mm