Cisco Systems OL-8131-01 manual Understanding the Phone Startup Process

Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network

Understanding the Phone Startup Process

Understanding the Phone Startup Process

When connecting to the VoIP network, the Cisco Unified IP Phone goes through

astandard startup process composed of the steps described in Table 2-1. Depending on your specific network configuration, not all of these steps may occur on your Cisco Unified IP Phone.

Table 2-1 Cisco Unified IP Phone Startup Process

Step	Configuration	Related Topics
1. Obtaining Power	You can connect the Cisco Unified IP Phone to a	•	Understanding the
from the Switch	Cisco Catalyst switch with one of the modules that		Phone Startup
	provides power to the phone (WS-X6348-RJ45V).		Process, page 2-4
	See the “Providing Power to the Cisco Unified IP	•	Providing Power to
	Phone” section on page 2-9for details.
			the Cisco Unified
	If you use this optional configuration, the phone		IP Phone, page 2-9
	receives phantom power and powers up when you	•	Resolving Startup
	connect the Cisco Unified IP Phone to the switch.
			Problems, page 7-2
	The phone then sends Cisco Discovery Protocol
	(CDP) notifications to the switch indicating that 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.
2. Loading the Stored	The Cisco Unified IP Phone has non-volatile Flash	•	Understanding the
Phone Image	memory in which it stores firmware images and		Phone Startup
	user-defined preferences. At startup, the phone		Process, page 2-4
	runs a bootstrap loader that loads a phone image	•	Resolving Startup
	stored in Flash memory. Using this image, the
			Problems, page 7-2
	phone initializes its software and hardware.

	Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 5.0 (SIP), Cisco Unified IP Phones
2-4	OL-8131-01