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Chapter 2
Preparing to Install the Cisco Unified IP Phones on Your Network
Understanding the Phone Startup Process
When connecting to the VoIP network, the Cisco Unified IP Phones go through a standard startup
process, described in
may occur on your Cisco Unified IP Phone.
Table 2-3
Cisco Unified IP Phone Startup Process
Task
Purpose
1.
Obtaining Power from the Switch
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.
4.
Obtaining an IP Address
If the Cisco Unified IP Phone is using DHCP to obtain
an IP address, the phone queries the DHCP server to
obtain one. If your network does not use DHCP, you
must assign static IP addresses to each phone locally.
5.
Accessing a TFTP Server
In addition to assigning an IP address, the DHCP
server directs the Cisco Unified IP Phone to a TFTP
Server. If the phone has a statically defined IP address,
you must configure the TFTP server locally on the
phone; the phone then contacts the TFTP server
directly.
You can also assign an alternative TFTP
Note
server to use instead of the one assigned by
DHCP.
6.
Requesting the CTL file
The TFTP server stores the certificate trust list (CTL)
file. This file contains the certificates necessary for
establishing a secure connection between the phone
and Cisco Unified Communications Manager.
OL-23091-01
Table
2-3. Depending on your specific network configuration, not all of these steps
Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
Understanding the Phone Startup Process
Related Topics
•
Adding Phones to the Cisco Unified
Communications Manager Database, page
Resolving Startup Problems, page
•
Resolving Startup Problems, page
•
•
Network Configuration Menu, page
Resolving Startup Problems, page
•
•
Network Configuration Menu, page
Resolving Startup Problems, page
•
•
Network Configuration Menu, page
Resolving Startup Problems, page
•
Refer to Cisco Unified Communications Manager
Security Guide,
Configuring the Cisco CTL Client.
2-8.
9-1.
9-1.
4-5.
9-1.
4-5.
9-1.
4-5.
9-1.
2-7
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Troubleshooting
