Phone Network
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Specify the offset of the client's subnet in seconds
from Coordinated Universal Time (UTC).
Specify a list of IP addresses for routers on the
client’s subnet.
Specify a list of time servers available to the client.
Specify a list of domain name servers available to
the client.
Specify the name of the client.
Specify the domain name that client should use
when resolving hostnames via DNS.
Network Time
Protocol Servers
Specify a list of NTP servers available to the client
by IP address.
Vendor-Specific
Information
Identify the vendor-specific information.
Identify the vendor type.
Identify a TFTP server when the 'sname' field in
the DHCP header has been used for DHCP
options.
Specify a POSIX timezone string.
SIP
Server/outbound
proxy server
Convey a SIP server’s or outbound proxy server’s
location to the client.
DHCP Option 66, Option 43 and Custom Option
During the startup, the phone will automatically detect the custom option, option 66, or option 43 for
obtaining the provisioning server address. The priority of obtaining the provisioning server address is as
follows: custom option>option 66 (identify the TFTP server)>option 43.
The IP phone can obtain the Auto Configuration Server (ACS) address by detecting option 43 during
startup.
To obtain the server address via DHCP option, make sure you have configured the DHCP option on the
phone. The option must be in accordance with the one defined in the DHCP server.
If you fail to configure the DHCP options for discovering the provisioning server on the DHCP server, an
alternate method of automatically discovering the provisioning server address is required. One possibility is
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