These are the most common Cisco Phones:

Features common to all models:

10/100 Network port (10/100/1000 on -GE models)
802.1q VLAN and QoS
Codecs G711a, G711u, G.729
Configuration: XML file via DHCP and TFTP (some models, proprietary binary from TXT file)
All models, SCCP Protocol (Some model also H323, MGCP, SIP)

Cisco IP Phone Comparision

Model	Line Buttons	F.Keys	Display	Speakerphone	POE	PC Port	Secure/Java	Discontinued	Price	Notes
3911	None	None	2 lines x 24 chars	Half-duplex	Yes	No	No	Yes	$70	SIP only
7902G	None	Four	No	No	Cisco 4W	No	No	Yes	$70
7905G	None	Four	3.5" 192x64 B/W	Monitor	Cisco 6.3W	No	No	Yes	$150
7906G	None	Four	3.5" 192x64 B/W	Monitor	Yes 5W	Yes	Yes	No	$150
7911G	None	Four	3.5" 192x64 B/W	Monitor	Yes 5W	Yes	Yes	No	$200
7912G	None	Four	3.5" 192x64 B/W	Monitor	Cisco 6.3W	Yes	No	Yes	$150
7920G	None	??	2" 128x59 Color	??	No	No	No	No	??
7921G	None	Two	2" 176x220 Color	Handsfree	No	No	Yes	No	$600
7931G	24	Four	5" 192x64 Backlight	Handsfree	.3af 7W	Yes	yes	No	$220	SCCP only
7940G	Two	Four	5" 320x222 Monochrome	Handsfree	Cisco 7W	Yes	No	Yes	$150
7941G 7941G-GE	Two	Four	5" 320x222 Greyscale 4-bit	Handsfree	Yes 6.3W	Yes	Yes	No	$200
7942G	Two	Four	5" 320x222 Greyscale 4-bit	Handsfree	Yes 6.3W	Yes	Yes	No	?	G.722, iLBC, gigabit eth.
7945G	Two	Four	5" 320x240 Color 16-bit	Handsfree	Yes 6.3W	Yes	Yes	No	?	G.722, iLBC, gigabit eth.
7960G	Six	Four	5" 320x222 Monochrome	Handsfree	Cisco 7W	Yes	No	Yes	$250
7961G 7961G-GE	Six	Four	5" 320x222 Greyscale 4-bit	Handsfree	Yes 6.3W	Yes	Yes	No	$300
7962G	Six	Four	5" 320x222 Greyscale 4-bit	Handsfree	Yes 6.3W	Yes	Yes	No	$300	G.722, iLBC, gigabit eth.
7965G	Six	Four	5" 320x240 Color 16-bit	Handsfree	Yes 6.3W	Yes	Yes	No	$300	G.722, iLBC, gigabit eth.
7970G 7971G-GE	Eight	Five	5.6" 320x234 Color 12-bit touchscreen	Handsfree	Yes 10W	Yes	Yes	No	$400
7975G	Eight	Five	5.6" 320x240 Color 16-bit touchscreen	Handsfree	Yes 10W	Yes	Yes	No	??	G.722, iLBC, gigabit eth.

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