Dhcp Support For Handsets That Emulate The Ip Phone 2004 - Avaya Communication Server 1000 Installation And Commissioning Manual

DHCP option 42: Length 4+bytes This option specifies a list of IP addresses indicating
Network Time Protocol (NTP) servers available to the client. Servers SHOULD be listed in
order of preference.
00 01 02 03 04 05 06 07
Code
Code. 8 bits. Always set to 3.
Length. 8 bits. 4+ in multiples of 4.
IP address. 32 bits. One or more IPv4 addresses.
RFCs: [RFC 2132] DHCP Options.
Updated by: RFC 3942.
DHCP option 43 1+ Vendor specific information. RFC 1533, RFC 2132
DHCP option 60 1+ Class-identifier. RFC 1533, RFC 2132 – must be the string value of:
Nortel-221x- A or Nortel-61xx-A
DHCP option 66 1+ TFTP server name. RFC 2132
DHCP option 128 TFPT Server IP address.
DHCP option 144 1+ Vendor specific information. RFC 1533, RFC 2132
DHCP option 151 1+ Vendor specific information. RFC 1533, RFC 2132
DHCP option 152 1+ Vendor specific information. RFC 1533, RFC 2132
DHCP option 157 1+ Vendor specific information. RFC 1533, RFC 2132
DHCP option 191 1+ Vendor specific information. RFC 1533, RFC 2132

DHCP support for handsets that emulate the IP Phone 2004

DHCP support in the IP Phone 2004 terminal requires a Class Identifier option with each DHCP
Discovery and Request message. Additionally, the IP Phone 2004 checks for either a Vendor
Specific option message with a specific, unique to IP Phone 2004 encapsulated subtype, or a
site-specific DHCP option. In either case, an IP Phone 2004 specific option must be returned by
the IP Phone 2004 aware DHCP server in all Offer and Ack messages. The IP Phone 2004
uses the information returned in this option to configure itself for proper operation. This
configuration includes binding a new IP address, netmask and gateway (for the 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 IP Phone 2004 does not accept any Offers or Acks that do not contain all of the following
options:
• a Router option
Avaya WLAN IP Telephony Installation and Commissioning
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Length
16 17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 IP
address
November 2010
DHCP options
223