Avaya 1603SW Guia Do Utilizador

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.

, the 1603SW-I SIP IP Deskphone sets the system values to the DHCPACK message 

field values shown.

DHCP lease time

Option #51 (if received).

DHCP lease renew time

Option #58 (if received).

DHCP lease rebind time

Option #59 (if received).

DOMAIN

Option #15 (if received).

DNSSRVR 

Option #6 (if received, which might be a list of IP Addresses).

HTTPSRVR

The siaddr field, if that field is non-zero.

IPADD

The yiaddr field.

LOGSRVR

Option #7 (if received).

MTU_SIZE

Option #26.

NETMASK

Option #1 (if received).

ROUTER

Option #3 (if received, which might be a list of IP Addresses).

SNTPSRVR

Option #42.