Dhcp And Tftp Servers; Initialization Process; Step 1: Telephone To Network - Avaya 4600 Series Administrator's Manual

Overview of Voice over IP (VoIP)

Initialization Process

DHCP and TFTP Servers

The DHCP server provides the following information to the 4600 Series IP Telephone:
•
IP Address of the 4600 Series IP Telephone
•
IP Address of the Gatekeeper board on the Avaya media server.
•
IP Address of the TFTP server
•
The subnet mask
•
IP Address of the router
•
DNS Server IP Address
You should administer the LAN so that every IP Telephone can access a DHCP server with the above
information.
The IP Telephone will not function without an IP address. The failure of a DHCP server at boot time will
leave all the affected voice terminals unusable. It is possible for the user to manually assign an IP address
to an IP Telephone, but when the DHCP server finally returns, the telephone will never look for a DHCP
server unless the static IP data is unassigned manually. In addition, manual entry of IP data is an error-
prone process. It is therefore strongly recommended that a DHCP server be available when the IP
Telephone reboots. If a DHCP server is not available at remote sites during WAN failures, the IP
Telephone will be unavailable after a reboot.
A minimum of two DHCP servers are recommended for reliability. A DHCP server is strongly
recommended to be available at remote sites if IP telephones are isolated from the central site DHCP
server(s) due to WAN failures.
The TFTP server provides the 4600 Series IP Telephone with a script file and, if appropriate, new or
updated application software (see
Process on page 30). In addition, you can edit an associated settings file to customize telephone
parameters for your specific environment (see
on page 66).
Initialization Process
The following is a high-level description of the information exchanged when the telephone is initializing
and registering. This description, which assumes all equipment is properly administered ahead of time,
may be helpful in explaining 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 in the network receives this message and relays it to the appropriate DHCP
server.
30
Step 3: Telephone and TFTP Server
Administering Options for the 4600 Series IP Telephones
4600 Series IP Telephone Release 2.1 LAN Administrator's Guide
on page 31 under Initialization
July 2004