Yealink SIP-T27G Administrator's Guide

Audio Features
166
Codec Algorithm Reference Bit Rate Sample Rate Packetization Time
iLBC_15_2kbps iLBC RFC 3952 15.2 Kbps 8 Ksps 20ms
iLBC_13_33kbps iLBC RFC 3952 13.33 Kbps 8 Ksps 30ms
opus opus RFC 6716
8-12 Kbps
16-20 Kbps
28-40 Kbps
48-64 Kbps
64-128 Kbps
8 Ksps
12 Ksps
16 Ksps
24 Ksps
48 Ksps
20ms
Note: The network bandwidth necessary to send the encoded audio is typically 5~10% higher than the bit rate due to pack-
etization overhead. For example, a two-way G.722 audio call at 64 Kbps consumes about 135 Kbps of network bandwidth.
The Opus codec supports various audio bandwidths, defined as follows:
Abbreviation Audio Bandwidth Sample Rate (Effective)
NB (narrowband) 4 kHz 8 kHz
MB (medium-band) 6 kHz 12 kHz
WB (wideband) 8 kHz 16 kHz
SWB (super-wideband) 12 kHz 24 kHz
FB (fullband) 20 kHz 48 kHz
Note: The T40P/T40G/T23P/T23G/T21(P) E2/T19(P) E2 phones support using WB for Opus encoding, and using NB, MB,
WB, SWB and FB for Opus decoding.
The T57W/T54W/T53W/T53/T48U/T48S/T46U/T46S/T43U/T42U/T42S/T41S/T27G phones support using WB
(default) or NB for Opus encoding, and using NB, MB, WB, SWB and FB for Opus decoding.
The CP920 phones support using anyone from NB to WB for opus encoding, and using NB, MB, WB, SWB and FB
for opus decoding.
The phones support up to two calls or a three-way conference when using Opus.
The following table lists the audio codecs supported by each phone model:
Phone Model Supported Audio Codecs
Default Audio
Codecs
T48G/T46G/T42G/T41P/T29G
G722, PCMA, PCMU, G729, G726-16,
G726-24, G726-32, G726-40, G723_53,
G723_63, iLBC_15_2kpbs, iLBC_13_
33kpbs
G722, PCMA, PCMU,
G729
T57W/T54W/T53W/T53/T48U/T48S/T46U/T46S/
T43U/T42S/T42U/T41S/T27G
G722, PCMA, PCMU, G729, G726-16,
G726-24, G726-32, G726-40, G723_53,
G723_63, opus, iLBC_15_2kpbs, iLBC_
13_33kpbs
G722, PCMA, PCMU,
G729
T40P/T40G/T23P/T23G/T21(P) E2/
T19(P) E2
G722, PCMA, PCMU, G729, G726-16,
G726-24, G726-32, G726-40, opus, iLBC_
15_2kpbs, iLBC_13_33kpbs
G722, PCMA, PCMU,
G729

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