Understanding The Phone Startup Process - Cisco 6921 Administration Manual
Administration guide for cisco unified communications manager 8.0 (sccp)
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Understanding the Phone Startup Process
If you configure security-related settings in Cisco Unified CM Administration, the phone configuration
file will contain sensitive information. To ensure the privacy of a configuration file, you must configure
it for encryption. For detailed information, refer to the "Configuring Encrypted Phone Configuration
Files" chapter in Cisco Unified Communications Manager Security Guide. A phone requests a
configuration file whenever it resets and registers with Cisco Unified CM.
A phone accesses a default configuration file named XmlDefault.cnf.xml only when the phone has not
received a valid Trust List file containing a certificate assigned to the Cisco Unified CM and TFTP.
If auto registration is not enabled and you did not add the phone to the Cisco Unified CM database, the
phone does not attempt to register with Cisco Unified CM. The phone continually displays the
"Configuring IP" message until you either enable auto-registration or add the phone to the Cisco Unified
CM database.
If the phone has registered before, the phone will access the configuration file named
SEPmac_address.cnf.xml, where mac_address is the MAC address of the phone.
The filenames are derived from the MAC Address and Description fields in the Phone Configuration
window of Cisco Unified CM Administration. The MAC address uniquely identifies the phone.
For more information on phone configuration settings, go to the
chapter in the Cisco Communications Manager Administration Guide.
For more information also refer to the Cisco Unified Communications Manager Security Guide.
Understanding the Phone Startup Process
When connecting to the VoIP network, the Cisco Unified IP Phone 6921, 6941, and 6961 go through a
standard startup process that is described in
all of these steps may occur on your Cisco Unified IP Phone.
Table 2-3
Cisco Unified IP Phone Startup Process
Task
Purpose
Obtaining 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.
Loading the Stored Phone Image
2.
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 image stored in
Flash memory. Using this image, the phone initializes
its software and hardware.
3.
Configuring VLAN
If the Cisco Unified IP Phone is connected to a
Cisco Catalyst switch, the switch next informs the
phone of the voice VLAN defined on the switch. The
phone needs to know its VLAN membership before it
can proceed with the Dynamic Host Configuration
Protocol (DHCP) request for an IP address.
Cisco Unified IP Phone 6921, 6941, and 6961 Administration Guide for Cisco Unified Communications Manager 8.0 (SCCP)
2-6
Chapter 2
Preparing to Install the Cisco Unified IP Phone on Your Network
Cisco Unified IP Phone Configuration
Table
2-3. Depending on your specific network setup, not
Related Topics
Adding Phones to the Cisco Unified CM Database,
•
page
2-8.
Resolving Startup Problems, page
•
Resolving Startup Problems, page
•
Network Setup Menu, page
•
Resolving Startup Problems, page
9-1.
9-1.
4-4.
9-1.
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