Cisco 7945G - Unified IP Phone VoIP Подготовка к установке - Страница 10

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Understanding the Phone Startup Process

Table 2-4

Cisco Unified IP Phone Startup Process (continued)

Task

Purpose

Requesting the ITL file.

The phone requests the ITL file after it requests the CTL

file. The ITL file contains the certificates of the entities that

the phone can trust. The certificates are used for

authenticating a secure connection with the servers or

authenticating a digital signature signed by the servers.

Requesting the Configuration File.

The TFTP server has configuration files, which define

parameters for connecting to Cisco

Unified Communications Manager and other information

for the phone.

Contacting Cisco Unified Communications Manager.

The configuration file defines how the Cisco

Unified IP Phone communicates with Cisco

Unified Communications Manager and provides a phone

with its load ID. After obtaining the file from the TFTP

server, the phone attempts to make a connection to the

highest priority Cisco Unified Communications Manager

on the list. If the security profile of the phone is configured

for secure signaling (encrypted or authenticated), and the

Cisco Unified Communications Manager is set to secure

mode, the phone makes a TLS connection. Otherwise, it

makes a nonsecure TCP connection.

If the phone was manually added to the database, Cisco

Unified Communications Manager identifies the phone. If

the phone was not manually added to the database and

auto-registration is enabled in Cisco

Unified Communications Manager, the phone attempts to

auto-register itself in the Cisco Unified Communications

Manager database.

Note

Auto-registration is disabled when you configure

the CTL client. In this case, the phone must be

manually added to the Cisco Unified

Communications Manager database.

Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.5

2-10

Chapter 2

Preparing to Install the Cisco Unified IP Phone on Your Network