Phone Startup Process - Cisco 7975G Software Manual

Phone Startup Process

The filenames derive from the MAC Address and Description fields in the Phone Configuration window of
Cisco Unified Communications Manager. The MAC address uniquely identifies the phone. For more
information, see the Cisco Unified Communications Manager Administration Guide.
For more information about the phone interaction with the TFTP server, see the Cisco Unified Communications
Manager System Guide, "Cisco TFTP" chapter.
Phone Startup Process
When the Cisco Unified IP Phone connects to the VoIP network, the phone goes through a standard startup
process that the following steps describe. Depending on your specific network configuration, not all of these
process steps may occur on your Cisco Unified IP Phone.
Procedure
Step 1 Obtain power from the switch.
If a phone is not using external power, the switch provides in-line power through the Ethernet cable that is
attached to the phone.
See Cisco Unified IP Phone Power, on page 31
Step 2 Load the StoredPhone Image.
The Cisco Unified IP Phone has nonvolatile 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.
The phone uses this image to initialize its software and hardware.
See Startup Problems, on page
Step 3 Configure VLAN.
If the Cisco Unified IP Phone is connected to a Cisco switch, the switch next informs the phone of the voice
VLAN defined on the switch port. The phone needs to know its VLAN membership before it can proceed
with the Dynamic Host Configuration Protocol (DHCP) request for an IP address.
See Network Configuration Menu, on page 66
Step 4 Obtain an IP Address.
If the Cisco Unified IP Phone uses DHCP to obtain an IP address, the phone queries the DHCP server to
obtain one. If you do not use DHCP in your network, you must assign static IP addresses to each phone locally.
See Network Configuration Menu, on page 66
Step 5
Access 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.
Note
See Network Configuration Menu, on page 66
Step 6 Request the CTL file.
The TFTP server stores the CTL file. This file contains the certificates that are necessary to establish a secure
connection between the phone and Cisco Unified Communications Manager.
See the Cisco Unified Communications Manager Security Guide, "Configuring the Cisco CTL Client" chapter.
Cisco Unified IP Phone 7975G, 7971G-GE, 7970G, 7965G, and 7945G Administration Guide for Cisco Unified
Communications Manager 9.0 (SCCP and SIP)
36
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You can also assign an alternative TFTP server to use instead of the one that DHCP assigns.
Cisco Unified IP Phones and Telephony Networks
and Startup Problems, on page
and Startup Problems, on page
and Startup Problems, on page
and Startup Problems, on page
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