Cisco 7925G Administration Guide

DescriptionStatic Setting
Identifies the gateway that provides connectivity to the IP network beyond
the subnet to which the phone belongs.
Default Router 1
If the system is configured to use hostnames for servers instead of IP
addresses, identifies the primary and secondary DNS server to resolve
hostnames.
DNS Server 1
DNS Server 2
Identifies the TFTP servers that the phone uses to obtain configuration files.TFTP Server 1
TFTP Server 2
Voice Communication Security in WLANs
Because all WLAN devices that are within range can receive all other WLAN traffic, securing voice
communications is critical in WLANs. To ensure that voice traffic is not manipulated or intercepted by
intruders, the Cisco Unified Wireless IP Phone and Cisco Aironet APs are supported in the Cisco SAFE
Security architecture. For more information about security in networks, see http://www.cisco.com/en/US/
netsol/ns744/networking_solutions_program_home.html.
Authentication Methods
The Cisco Wireless IP telephony solution provides wireless network security that prevents unauthorized logins
and compromised communications by using the following authentication methods:
Open Authentication
Any wireless device can request authentication in an open system. The AP that receives the request
may grant authentication to any requestor or only to requestors on a list of users. Communication
between the wireless device and AP could be nonencrypted.
Open Authentication with WEP
This is similar to Open Authentication in the preceding bullet, except with improved security.
Communication between the wireless device and AP use Wired Equivalent Privacy (WEP) keys to
provide security.
Shared Key Authentication
The AP sends an unencrypted challenge text string to any device attempting to communicate with the
AP. The device that requests authentication uses a preconfigured WEP key to encrypt the challenge
text and sends the encrypted challenge text back to the AP. If the challenge text is encrypted correctly,
the AP allows the requesting device to authenticate. A device can authenticate only if its WEP key
matches the WEP key on the APs.
Shared key authentication can be less secure than open authentication with WEP because someone can
monitor the challenges. An intruder can calculate the WEP key by comparing the unencrypted and
encrypted challenge text strings.
Cisco Unified Wireless IP Phone 7925G, 7925G-EX, and 7926G Administration Guide
39
VoIP Wireless Network
Voice Communication Security in WLANs

Cisco 7925G Specifications

General

Keypad number of keys	12
Display diagonal	2 \
Display resolution	176 x 220 pixels
Call waiting	Yes
Lines quantity	6 lines
Voice codecs	G.711a, G.722, G.729a, iLBC
Security algorithms	128-bit WEP, SSL/TLS, WPA
Supported network protocols	DHCP, TFTP, DNS, SCCP, SRST
Input voltage	100 - 240 V
Dimensions (WxDxH)	52 x 20 x 127 mm
Minimum system requirements	Cisco Unified Communications Manager 4.1, 4.2, 4.3, 5.1, 6.0, 6.1, 7.0 + Cisco Unified Communications Manager Express 4.3 +
Input frequency	50/60 Hz
Storage temperature (T-T)	-30 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	10 - 95 %
Product type	IP Phone
Product color	Gray
Safety	UL 60950, CSA 22.2 No.60950, EN 60950, IEC 60950, AS/NZS 60950, IEC 60529 (IP 54)
Certification	47 CFR 15 B ICES-003 B EN 55022 B AS/NZS CISPR 22 B CISPR 22 B VCCI B EN 61000-3-2 EN 61000-3-3 KN 22 EN 55024 EN 50082-1 EN 61000-6-1 EN 300386 EN 60601-1-2 KN
Compliance industry standards	IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.1X, IEEE 802.11e

Weight and Dimensions

Weight	138 g