Datasheet

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Table 3. Product Comparisons
Feature Cisco Unified Wireless IP Phone 7920 Cisco Unified Wireless IP Phone 7921G
Radio Single band 802.11b radio Dual band 802.11a/b/g radios
Display 1.75 in (44 mm) black/white (128x80
pixels)
2 in (5 cm) color (176x220 pixels)
Dedicated buttons No Application button, volume control, mute
Soft key buttons 2 2
Antenna Single Dual; Antenna switched diversity (5-GHz
band only)
Speakerphone No Yes
Battery life Std: up to 30 hrs standby/3.5 hrs talk
Extd: up to 40 hrs Standby/4.25 hrs talk
Std: up to 80 hrs standby/10 hrs talk Extd:
up to 100 hrs standby/12 hrs talk
Navigation key 4-way 5-way
Ringing and message waiting
indicator LED
No Yes
Vibration alert Yes Yes
Backlit keypad Yes Yes
Headset connector 2.5mm (4-conductor/3-band) 2.5mm (4-conductor/3-band)
USB connector Yes Yes
Dimensions (H x W x D) 5.2 x 2.1 x 1.0 in (13.2 x 5.3 x 2.5 cm) 5.0 x 2.1 x 1.0 in (12.7 x 5.3 x 2.5 cm)
Weight 4.8 oz (136.1 g) 5 oz (145 g)
Integrated speakerphone in
desktop charger
No Yes
Lanyard hole No Yes
Protocol SCCP SCCP
Operating System VxWorks Linux
Communications Manager 3.3, 4.0, 4.1, 4.2, 4.3, 5.0 and later 4.1, 4.2, 4.3, 5.0 and later
Communications Manager
Express
3.2 and later 4.1 and later
Survivable Remote Site
Telephony
2.0 4.1
Cisco Compatible Extensions
(CCX)
2.0 4.0
Authentication LEAP, EAP-FAST, WPA, WPA-PSK,
CCKM
LEAP, EAP-FAST, WPA, WPA-PSK,
WPA2, CCKM
Encryption WEP (40/128 bit), TKIP/MIC WEP (40/128 bit), TKIP/MIC, AES
QoS QBSS QBSS, WMM, TSPEC
Power saving No U-APSD, PS-Poll
Radar detection No DFS, TPC per 802.11h
World mode support per 802.11d No Yes
Voice security features No Certificates, image/device/file/signaling
authentication, secure SRST, media
encryption using SRTP, signaling
integrity/encryption (TLS), certificate
authority proxy function (CAPF), secure
profiles, encrypted configuration files
XML Yes Yes
Configuration Web page Read-only GUI for configuration
Syslog Manual Automatic
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