Model SIP-T29G SIP-T27G SIP-T23G SIP-T21(P) E2 SIP-T19(P) E2
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LCD 4.3″ color LCD 3.66″ graphical LCD 2.8″ graphical LCD 2.3″ graphical LCD 2.3″ graphical LCD
Resolution 480 x 272 240 x 120 132 x 64 132 x 64 132 x 64
LCD Backlight √ √ √ √ √
Line 16 6 3 2 1
PoE √ √ √ √ (T21P E2) √ (T19P E2)
GigE √ √ √ x x
Wall Mounting √ √ √ √ √
Foot Stand 2 adjustable angles 2 adjustable angles 1adjustable angle 1adjustable angle 1adjustable angle
USB Port (2.0 compliant) 1 1 x x x
Ethernet Port Dual-port Gigabit Ethernet Dual-port Gigabit Ethernet Dual-port Gigabit Ethernet  2 x RJ45 10/100M Ethernet ports  2 x RJ45 10/100M Ethernet ports
Handset Port (RJ-9) √ √ √ √ √
Headset Port (RJ-9) √ √ √ √ √
External Yealink AC Adapter (optional)  AC 100~240V input and DC 5V/2A output  AC 100~240V input and DC 5V/1.2A output  AC 100~240V input and DC 5V/600mA output  AC 100~240V input and DC 5V/600mA output
(T21 E2: Standard/T21P E2: Optional)		  AC 100~240V input and DC 5V/600mA output
(T19 E2: Standard/T19P E2: Optional)
Line Key 10 8 3 2 0
Memory Key 27 (3 pages of 9 keys) 21 (3 pages of 7 keys) 3 2 0
Yealink EXP50 Expansion Module X X X X X
Yealink EXP40 Expansion Module x x x x x
Yealink EXP20 Expansion Module √ √ x x x
Yealink EHS36 Wireless Headset Adapter √ √ x x x
Yealink YHS32 Headset √ √ √ √ √
Yealink Bluetooth Adapter BT40 √ √ x x x
Yealink Wi-Fi Adapter WF40 √ √ x x x
USB Recording √ √ x x x
3-way Conferencing √ √ √ √ √
HD Voice HD Speaker
HD Handset		 HD Speaker
HD Handset		 HD Speaker
HD Handset		 HD Speaker
HD Handset		 HD Handset
Wide-band Codecs G.722 G.722,Opus G.722, Opus G.722, Opus G.722, Opus
Narrow-band Codecs G.711(A/µ), G.723, G.729AB,
G.726, iLBC		 G.711u/a, G.729A/B, G.726,
G.723.1, ilbc, Opus		  G.711(A/µ), G.729AB, G.726, iLBC  G.711(A/µ), G.729AB, G.726, iLBC  G.711(A/µ), G.729AB, G.726, iLBC
LCD Type Fixed Fixed Fixed Fixed Fixed
Operating System Linux Linux Linux Linux Linux
Built-in Bluetooth X X X X X
Built-in Wi-Fi X X X X X
USB Headset X X X X X
Camera X X X X X
Video Resolution X X X X X
Video Codecs X X X X X
3-way Video Conferencing X X X X X
5-way video/audio mixed conferencing X X X X X
HDMI X X X X X