Operation Manual - DHCP
Quidway S3900 Series Ethernet Switches-Release 1510 Chapter 2 DHCP Server Configuration
Huawei Technologies Proprietary
2-26
I. Basic concept
The four sub-options of option 184 mainly carry information about voice. The following
lists the sub-options and the carried information:
z option: An option in a DHCP message. This option may be a field in variable
length. Option contains some lease information and message types. The option
field contains at least one and up to 255 options.
z Sub-option 1: IP address of the network call processor (NCP-IP).
z Sub-option 2: IP address of the alternate server (AS-IP).
z Sub-option 3: Voice VLAN configuration.
z Sub-option 4: Fail-over call routing.
II. Meanings of the sub-options for option 184
Table 2-23 Meanings of the sub-options for option 184
Sub-option Feature Function Note
NCP-IP
(sub-option 1)
The NCP-IP
sub-option carries
the IP address of
the network call
processor (NCP).
The IP address of
the NCP server
carried by
sub-option 1 of
option 184 is
intended for
identifying the
server serving as
the network call
controller and the
server used for
application
downloading.
When used in option
184, this sub-option
must be the first
sub-option, that is,
sub-option 1
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