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Chapter 3 Installing IP telephones 51

IP Telephony Configuration Guide

4 If the DHCP server is not properly configured with the Published IP address, the telephones

will display

Invalid Server Address. If this message appears, correct the DHCP settings,

and restart the telephones.

IP telephony DHCP notes

The i2004 supports two forms of DHCP configuration: full and partial. If partial DHCP is selected,

the user must manually enter the primary and secondary Business Communications Manager

address/action/retry count. The i2004 then configures a IP address/netmask and default IP gateway

via DHCP. If full DHCP is selected, the i2004 configures all parameters via DHCP.

Note: If partial DHCP is selected, the DHCP server does not need to send the vendor-specific or

site-specific information outlined below. The information below pertains to Full DHCP only. In

the case of partial DHCP, the i2004 requires only the Router option and Subnet Mask option to

configure (along with IP address and lease time).

Full DHCP support in the i2004 terminal requires sending a Class Identifier option with each

DHCP Discovery and Request message. Additionally, the i2004 checks for either a

vendor-specific option message with a specific, unique to Nortel i2004, encapsulated sub-type OR

a site-specific DHCP option. In either case, a Nortel i2004-specific option must be returned by the

i2004-aware DHCP server in all Offer and Ack messages. The i2004 will use the information

returned in this option to configure itself for proper operation. This includes binding a new

IP address, netmask and gateway (for local IP stack) as well as configuring Server 1 (minimum)

and, optionally, Server 2. By default, Server 1 is always assumed to be the primary server after a

DHCP session.

The i2004 will not accept any Offers/Acks if they do not contain:

• a Router option (i2004 needs a default router to function) AND

• a Subnet Mask option AND

• an S1 Server Address and Port

• The i20XX sets require the scope value 128 to be configured on the DHCP server as follows:

Format:

Nortel-i2004-A,iii.jjj.kkk.lll:ppppp,aaa,rrr;iii.jjj.kkk.lll:p

ppp,aaa,rrr.

where,

Nortel-i2004-A uniquely identifies this as the Nortel option

Additionally, the -A signifies this version of this specification. Future enhancements could use

-B, for example.

ASCII , is used to separate fields

ASCII ; is used to separate Primary from Secondary Business Communications Manager

information

ASCII . is used to signal end of structure

iii.jjj.kkk.lll:ppppp identifies IP:port for server (ASCII encoded decimal)

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Avaya IP Telephony Guía de configuración Pagina 51