Understanding The Phone Startup Process - Cisco 8961 Administration Manual

Understanding the Phone Startup Process

Understanding the Phone Startup Process
When connecting to the VoIP network, the Cisco Unified IP Phone 8961, 9951, and 9971 go through a
standard startup process that is described in
configuration, not all of these steps may occur on your Cisco Unified IP Phone.
Table 2-3 Cisco Unified IP Phone Startup Process
Task Purpose
Obtain power from the switch.
1.
If a phone is not using external power, the switch provides in-line power
through the Ethernet cable attached to the phone.
(For a Cisco Unified IP Phone 9971 in a wireless LAN only) Scanning
2.
for an access point.
The Cisco Unified IP Phone scans the RF coverage area with the radio.
The phone searches the network profiles and scans for access points
that contain a matching SSID and authentication type. The phone
associates with the access point with the highest RSSI that matches with
the network profile.
(For a Cisco Unified IP Phone 9971 in a wireless LAN only)
3.
Authenticating with the access point.
The Cisco Unified IP Phone begins the authentication 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 the WEP key 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. For more information about the name and password
authentication, see
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.
Load the stored phone image.
4.
The Cisco Unified IP Phone has non-volatile Flash memory in which it
stores firmware images and user-defined preferences. At startup, the
phone runs a bootstrap loader that loads a phone firmware image stored
in Flash memory. Using this image, the phone initializes the software
and hardware.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.6 (SIP)
2-8
Chapter 2
"WLAN Setup Menu" section on page
Preparing to Install the Cisco Unified IP Phone on Your Network
Table 2-3. Depending on your specific network
Related Topics
Adding Phones to the Cisco
•
Unified Communications Manager
Database, page
Resolving Startup Problems,
•
page
Interacting with Cisco Unified
•
Wireless APs, page
Authentication Methods,
•
page
7-7.
Resolving Startup Problems,
•
page
2-10.
12-1.
6-8.
6-11.
12-1.