Specifications

3-27
Cisco Unified Wireless IP Phone 7921G Administration Guide for Cisco Unified CallManager Release 4.1, 4.2, 5.0
OL-10802-02
Chapter 3 Setting Up the Cisco Unified Wireless IP Phone 7921G
Understanding the Phone Startup Process
2. Scanning for an
access point
The Cisco Unified Wireless IP Phone 7921G
scans the RF coverage area with its radio. The
phone searches its network profiles and scans
for access points that have a matching SSID and
authentication type. The phone associates with
the access point with the highest RSSI that
matches with its network profile.
Interacting with Cisco
Unified Wireless Access
Points, page 2-12
Resolving Startup and
Connectivity Problems,
page 9-1
3. Authenticating with
access point
The Cisco Unified Wireless IP Phone 7921G
begins the authenticating process.
• If set for Open, then any device can
authenticate to the access point. For added
security, static WEP encryption might
optionally be used.
• If set to Shared Key, the phone encrypts the
challenge text using the WEP key and the
access point must verify that the WEP key
was used to encrypt the challenge text
before network access is available.
• If set for LEAP or EAP-FAST, then the
user name and password are authenticated
by the RADIUS server before network
access is available.
• If set for Auto (AKM), the phone looks for
an access point with one of the following
key management options enabled:
– WPA, WPA2, or CCKM—The
username and password are
authenticated by the RADIUS server
before network access is available.
– WPA-Pre-shared key,
WPA2-Pre-shared key—The phone
authenticates with the access point
using the pre-shared key.
Authentication
Mechanisms in the
Wireless Network,
page 2-19
Table 3-6 Cisco Unified Wireless IP Phone Startup Process (continued)
Step Description Related Topics