Initialization Process. Avaya 4600

Overview of Voice over IP (VoIP) and Network Protocols

Initialization Process

These steps offer a high-level description of the information exchanged when the telephone initializes and registers. This description assumes that all equipment is properly administered ahead of time. This description can help you understand how the 4600 Series IP Telephones relate to the routers and servers in your network.

Step 1: Telephone to Network

The telephone is appropriately installed and powered. After a short initialization process, the telephone identifies the LAN speed and sends a message out into the network, identifying itself and requesting further information. A router on the network receives this message and relays it to the appropriate DHCP server.

Step 2: DHCP Server to Telephone

The DHCP file server provides information to the telephone, as described in

DHCP and File

Servers on page 47. Among other data passed to the telephone is the IP Address of the TFTP

or HTTP server, which is crucial for the next step.

Step 3: Telephone and File Server

Beginning with Release 2.2, 4600 Series IP Telephones can download script files, application files, and settings files from either a TFTP, HTTP, or HTTPS server. The HTTPS server applies only if the server supports Transport Layer Security (TLS) encryption. If you have a mixture of

Release 2.2 and pre-Release 2.2 telephones, you can use either:

●

TFTP servers only.

●

Both TFTP and HTTP servers, with TFTP running phones with older releases and HTTP for telephones running Release 2.2 and later software.

A telephone that supports HTTP will attempt to access the HTTP server (if administered), and, if successful, will not attempt to access the TFTP server (if administered).

The script files, application files, and settings files discussed in this section are identical for

HTTP and TFTP servers. The general downloading process for those files is essentially the same. One exception is that when you use an HTTPS server, a TLS server is contacted first.

Therefore, we use the generic term “file server” here to mean both “TFTP server” and “HTTP server.”

36 4600 Series IP Telephone Release 2.2 LAN Administrator Guide

Initialization Process

The telephone queries the file server, which transmits a script file to the telephone. This script file, at a minimum, tells the telephone which application file the telephone must use. The application file is the software that has the telephony functionality, and can be easily updated for future enhancements.

The telephone uses the script file to determine if it has the proper application file. A newly installed telephone may have no application file, and therefore would not have the proper one. A previously installed telephone might not have the proper application file. If the telephone determines the application file indicated in the script file is missing, the telephone requests a download of the proper application file from the file server. The file server then downloads the file and conducts some checks to ensure that the file was downloaded properly. If the telephone determines it already has the proper file, the phone proceeds to the next step without downloading the application file again.

After checking and loading the application file, the 4600 Series IP Telephone, if appropriate, uses the script file to look for a settings file. The settings file can contain options you have administered for any or all of the 4600 Series IP Telephones in your network. For more information about this settings file, see

Administering Options for the 4600 Series IP

Telephones on page 80.

Step 4: Telephone and the Avaya Media Server

In this step, the telephone and the PBX exchange a series of messages which cause the display on the telephone to prompt the user. For a new installation, the user must enter the telephone’s extension and the media server password. For a restart of an existing installation, this information is already stored on the telephone, but the user might have to confirm the information. The telephone and the switch exchange more messaging, with the expected result that the telephone is appropriately registered on the switch.

More details about the installation process are available in the 4600 Series IP Telephone

Installation Guide and in

Chapter 3: Requirements

of this document.

Issue 2.2 April 2005 37

Overview of Voice over IP (VoIP) and Network Protocols

38 4600 Series IP Telephone Release 2.2 LAN Administrator Guide