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Chapter 3 Installing IP telephones 53

IP Telephony Configuration Guide

Configuring DHCP

You can use DHCP to automatically assign IP addresses to the IP telephones as an alternative to

manually configuring IP addresses for IP telephones. If you are using the Business

Communications Manager as the DHCP server, you can also configure the server to automatically

locate the VLAN ID for the system and assign it to the telephones that register.

Before setting up DHCP using the information in “Setting up DHCP to work with IP terminals”,

refer to the Programming Operations Guide for detailed information about DHCP. Also refer to

“IP telephony DHCP notes” on page 54.

Setting up DHCP to work with IP terminals

1 Ensure that DHCP (under Services) is set up with the following settings:

Global Options tab: NORTEL IP Terminal Information box is set to:

Nortel-i2004-A, <ip address>:7000,1,250;<ip address>:7000,1,1.

Where <ip address> is the published IP address. Be sure to include the period at the end of

the string (1,250.).

Nortel IP Terminal VLAN ID contains an identification if the system is using the VLAN

option. If you do not know what the entry should be, contact the system administrator for the

VLAN switch.

If you want DHCP to automatically assign VLAN IDs to the IP telephones, enter the VLAN

IDs in the following format: VLAN-A:id1,id2,...,idn (Example, if your VLAN IDS

are: 1100, 1200, 1300 and 1400, enter VLAN-A:1100,1200,1300,1400. (the entry must

be terminated with a period).

If you do not want DHCP to automatically assign VLAN IDs to the IP telephones, enter

VLAN-A:none. (the entry must be terminated with a period).

Summary tab: Status box is set to Enabled.

2 Ensure that the DHCP LAN settings are correct (DHCP, Local Scope, LANX, where LANX

is a LAN that contains IP sets that use DHCP):

• Scope Specific Options tab:

Scope Status: Enabled

Default Gateway Field: <Published IP Address>

• Address Range tab: contains the range of IP addresses you need.

3 Restart all existing connected IP telephones.

Note: Whenever changes are made to the DHCP settings, telephones will retain the old

settings until they are restarted.

Caution: Do not enable DHCP on the Business Communications Manager if you have

another DHCP server on the network. Refer to the Programming Operations Guide for

detailed information about disabling DHCP or about using other types of DHCP.

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Avaya IP Telephony Guía de configuración Pagina 53