Avaya 9601 - Core Call Operations; Answering and Handling Calls

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• Continue to use its IP address after the DHCP lease expires by setting DHCPSTD to 0.

The latter case is the default. If the default is invoked, after the DHCP lease expires the deskphone

continues to broadcast DHCPREQUEST messages for its current IP address, and it sends an ARP

Request for its own IP address every five seconds.

The messages continue to be sent until the device receives a DHCPACK, a DHCPNAK, or an ARP

reply. After receiving a DHCPNAK or ARP reply, the device displays an error message, sets its IP

address to 0.0.0.0, and attempts to contact the DHCP server again. Log events are generated for

either case.

Depending on the DHCP application you choose, the application might not immediately recycle

expired DHCP leases. An expired lease might remain reserved for the original client a day or more.

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 that there are two IP addresses, therefore two possible DHCP leases. Assume that there

are three IP devices in the network, two of which are using the two available IP addresses. When

the lease for the first two devices expires, the third device cannot get a lease until the reservation

period expires. Even if the other two devices are removed from the network, the third device

remains without a lease until the reservation period expires.

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