conflict with another device. With the system parameter DHCPSTD, an
administrator can specify that the telephone will do one of the following: a).
Comply with the DHCP standard by setting DHCPSTD to 1. b). Continue to use
the IP Address after the DHCP lease expires by setting DHCPSTD to 0. This
setting is the default. For more information, see
9600 Series H.323 customizable
system parameters on page 71.If you invoke the default after the DHCP lease
expires, the phone continues to broadcast DHCPREQUEST messages for the
current IP address. The deskphone sends an ARP Request for its own IP
Address every 5 seconds until the phone receives a DHCPACK, a DHCPNAK, or
an ARP Reply. After receiving a DHCPNAK, or ARP Reply, the phone displays an
error message, sets the IP address to 0.0.0.0, and attempts to contact the DHCP
server again. Depending on the DHCP application you choose, be aware that the
application does not immediately recycle expired DHCP leases. An expired lease
might remain reserved for the original client for one day or more.
The following example shows the implication of having a reservation period: Take two
IP addresses, therefore two possible DHCP leases. Take three IP deskphones, two of
which are using the two available IP addresses. When the lease for the first two
deskphones expires, the third deskphone cannot get a lease until the reservation
period expires. Even if you remove the other two deskphones from the network, the
third deskphone remains without a lease until the reservation period expires.
- Option 52: Overload Option, if required. If the 9600 Series IP Deskphone receives
this option in a message and interprets the sname and file fields in accordance with
IETF RFC 2132, Section 9.3.
- Option 58: DHCP lease renew time. If the 9600 Series IP Deskphone does not
receive this parameter, or if this value is greater than that for Option 51, the phone
uses the default value of T1 (renewal timer) according to IETF RFC 2131, Section
4.5.
- Option 59: DHCP lease rebind time. If the 9600 Series IP Deskphone does not
receive this parameter, or if this value is greater than that for Option 51, the phone
uses the default value of T2 (rebinding timer) according to RFC 2131, Section 4.5
- Option 242: Site-Specific Option Number (SSON). You do not have to use Option
242. If you do not use this option, you must ensure that you administer the key
information, especially HTTPSRVR and MCIPADD appropriately elsewhere.
An example of proper DHCP administration is:
Option 242 for DHCP: MCIPADD =xxxx.xxx.xxx.xxx
Result
In the following table,
DHCPACK Setting of Parameter Values on page 55 the 9600 Series IP
Deskphone sets the following parameter values to the DHCPACK message field and option.
Server Administration
March 2018 Administering Avaya 9608/9608G/9611G/9621G/9641G/9641GS IP Deskphones H.
323 54
Comments on this document? infodev@avaya.com
To Next Page
Loading...
