3com 5500-ei pwr Installation Instruction

 

2-13 

 

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. 

 

Follow these steps to configure Option 184 parameters for the DHCP client with voice service: 

Enter 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. 

 

Specify an IP address for the network calling processor before performing other configuration.