Filter
Top Products
Chapter 2 Preparing to Install the Cisco IP Phone on Your Network
Understanding the Phone Startup Process
2-4
Cisco IP Phone Administration Guide for Cisco CallManager 3.3, Cisco IP Phones 7902G/7905G/7912G
OL-6313-01
Understanding the Phone Startup Process
When connecting to the VoIP network, the Cisco IP Phone goes through a
standard startup process composed of up to seven steps. Depending on your
specific network configuration, not all of these steps may occur on your
Cisco IP Phone.
Each of these steps is described in the sections that follow:
• Obtaining Power from the Switch, page 2-4
• Loading the Stored Phone Image, page 2-5
• Configuring VLAN, page 2-5
• Obtaining an IP Address, page 2-5
• Accessing TFTP Server, page 2-6
• Requesting Configuration Files, page 2-6
• Contacting Cisco CallManager, page 2-7
Related Topics
• Verifying the Phone Startup Process, page 3-9
• Resolving Startup Problems, page 6-12
Obtaining Power from the Switch
You can connect the Cisco IP Phone to a Cisco Catalyst switch with one of the
modules that provides power to the phone (WS-X6348-RJ45V). See the
“Providing Power to the Cisco IP Phone” section on page 2-9 for details.
If you use this optional configuration, the phone receives phantom power and
powers up when you connect the Cisco IP Phone to the switch. The phone then
sends Cisco Discovery Protocol (CDP) notifications to the switch indicating it is
ready to receive CDP packets and indicating the power requirement for the phone.
The switch allocates power and sends it over the network cable.