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Server Administration

54 Avaya Agent Deskphone 16CC Administrator Guide

- Option 58 - DHCP lease renew time.

If not received or if this value is greater than that for Option 51, the default value of T1

(renewal timer) is used as per IETF RFC 2131, Section 4.5, listed in Related

Documentation.

- Option 59 - DHCP lease rebind time.

If not received or if this value is greater than that for Option 51, the default value of T2

(rebinding timer) is used as per RFC 2131, Section 4.5

The Avaya Agent Deskphone 16CC does not support Regular Expression Matching, and

therefore, does not use wildcards. For more information, see Administering Telephone

Options on page 69.

In configurations where the upgrade script and binary files are in the default directory on the

HTTP server, do not use the HTTPDIR=<path>.

Avaya recommends that you administer DHCP servers to deliver only the options specified in

this document. Administering additional, unexpected options might have unexpected results,

including causing the IP telephone to ignore the DHCP server.

The SIP Proxy server name and HTTP server name must each be no more than 32 characters

in length.

Examples of good DNS administration include:

- Option 6: “aaa.aaa.aaa.aaa”

- Option 15: “dnsexample.yourco.com,zzz.zzz.zzz.zzz”

- Option 42: "aaa.aaa.aaa.aaa"

Depending on the DHCP application you choose, be aware that the application most

likely does not immediately recycle expired DHCP leases. An expired lease might

remain reserved for the original client a day or more. For example, Windows NT

DHCP reserves expired leases for about one day. This reservation period protects a

lease for a short time. If the client and the DHCP server are in two different time

zones, the clocks of the computers are not in sync, or the client is not on the network

when the lease expires, there is time to correct the situation.

- The following example shows the implication of having a reservation period: Assume

two IP Addresses, therefore two possible DHCP leases. Assume three IP telephones,

two of which are using the two available IP Addresses. When the lease for the first two

telephones expires, the third telephone cannot get a lease until the reservation period

expires. Even if the other two telephones are removed from the network, the third

telephone remains without a lease until the reservation period expires.

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Avaya 16CC Guia do Utilizador Página 54