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446 Features

ppppp is the port number in ASCII encoded decimal. The port number

must be set to 4100.

In all cases, the ASCII encoded numbers are treated as decimal values

and all leading zeros are ignored. More specifically, a leading zero does

not change the interpretation of the value to be OCTAL encoded. For

example, 0021, 021, and 21 are all parsed and interpreted as decimal 21.

Format for IP Phone DHCP Site Specific Option

This option uses the "reserved for site specific use" DHCP options

(number 128 to 254 – refer to RFC 1541 and RFC 1533) and must be

returned by the DHCP server as part of each DHCP OFFER and ACK

message for the IP Phone to accept these messages as valid.

The IP Phone pulls the relevant information out of this option and uses

it to configure the IP address and so on for the primary and (optionally)

secondary TPS.

Either this site specific option must be present or a similarly encoded

vendor-specific option must be sent (as previously described). For

example, configure the DHCP server to send one or the other – not both.

The choice of using either Vendor Specific or Site Specific options is

provided to enable Windows NT DHCP servers to be used with the IP

Phone. Windows NT servers do not properly implement the Vendor

Specific Option and as a result, Windows NT implementations must use

the Site Specific version.

Format of the DHCP Site Specific field

The format of the DHCP Site Specific field is the same as the format of

the Encapsulated Vendor Specific Sub-option field. See “Format of the

Encapsulated Vendor Specific Sub-option field” (page 444) .

DHCP Auto Discovery must be used only if the telephone and PC are:

• connected to the same Layer 2 switch port through a three-port switch

• on separate sub-nets

The DHCP server can be configured to supply the VLAN information to

the IP Phones. The server uses the Site Specific option in the DHCP offer

message to convey the VLAN information to the IP Phone.

Configuring a DHCP Server for VLAN Discovery is optional. This

configuration is done in addition to any done for Full DHCP configuration

and it is required only when configuring the VLAN Auto Discovery.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010