Avaya SIP Software 3.2 for 1200 Series Uživatelský manuál Strana 86

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Server to IP Deskphone options
The DHCP server can send any option to the IP Deskphone as part of the DHCP Offer
message. The IP Deskphone accepts the following options:
DHCP Option Description
IPv4 Address
Net mask 1
Router Option 3
Domain Name Server 6 Accepts the first two DNS addresses.
Domain Name 15
Broadcast Address 28
Vendor Specific
Option
43
DHCP Renewal Time 58
DHCP Rebinding
Time
59
TFTP Server Name 66 Two forms of the server name are supported.
If a dotted-decimal IP address is returned, it
is assumed to point to a TFTP server. A full
URL can also be provided to specify a
protocol and FQDN.
Old Site Specific
Options
128, 131, 144, 157,
188, 191, 205, 219,
223
Options are supported, but not
recommended, for new installations. These
options are reclaimed according to RFC
3942.
Site Specific Options 128, 131, 144, 157,
188, 191, 205, 219,
223
Multiple DHCP Servers
It is possible that two or more DHCP servers can respond to the DHCP Discover message.
When the IP Deskphone sends a Discover message, it waits for 1 second to collect all the
responses. If there is more than one response, the IP Deskphone selects the response with
the longest lease time. If the lease time is identical, the first response is selected.
Configure the DHCP Server
86 SIP Software for Avaya 1200 Series IP Deskphones-Administration January 2012
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