H3C Technologies H3C S3600 Series Switches - Manual (Page 652)

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For the configurations specifying to add sub-option 2, sub-option 3, and sub-option 4 in the response
packets to take effect, you need to configure the DHCP server to add sub-option 1.
Mechanism of using Option 184 on DHCP server
The DHCP server encapsulates the information for Option 184 to carry in the response packets sent to
the DHCP clients. Supposing that the DHCP clients are on the same segment as the DHCP server, the
mechanism of Option 184 on the DHCP server is as follows:
1) A DHCP client sends to the DHCP server a request packet carrying Option 55, which indicates the
client requests the configuration parameters of Option 184.
2) The DHCP server checks the request list in Option 55 carried by the request packet, and then adds
the sub-options of Option 184 in the Options field of the response packet to be sent to the DHCP
client.
Only when the DHCP client specifies in Option 55 of the request packet that it requires Option 184, does
the DHCP server add Option 184 in the response packet sent to the client.
Configuring Option 184 Parameters for the DHCP Client with Voice Service
Follow these steps to configure Option 184 parameters for the DHCP client with voice service:
To do… Use the command… Remarks
Enter system view system-view —
Enter DHCP address pool view
dhcp server ip-pool
pool-name
—
Specify the IP address of the
primary network calling
processor
voice-config ncp-ip
ip-address Required
Not specified by default.
Specify the IP address of the
backup network calling
processor
voice-config as-ip ip-address
Optional
Not specified by default.
Configure the voice VLAN
voice-config voice-vlan
vlan-id { disable | enable } Optional
Not configured by default.
Specify the failover IP address
voice-config fail-over
ip-address dialer-string
Optional
No failover IP address is
specified by default.