•IP address configuration for the IP Phone 1140E•

Full DHCP mode
59
Configure the DHCP server to support Full DHCP mode
SIP IP Phone class identifier
A Nortel-SIP-Phone-aware DHCP server is needed for Full DHCP mode.
For Full DHCP mode, the DHCP server requires special configuration.
After the DHCP server is configured to recognize the IP Phone E with
SIP Firmware as a unique IP Phone, the DHCP server can treat the IP
Phone E differently than other DHCP IP Phones. An IP Phone-aware
DHCP server can automatically configure Nortel IP Phones by sending all information that the IP Phone requires.
The IP Phone E and the DHCP server communicate using a unique class identifier. After the IP Phone E first sends the DHCP DISCOVER,
it includes the Nortel-SIP-Phone-A ASCII string within the Vendor Class
Identifier (Option 60). The DHCP server recognizes this special Vendor
Class Identifier (Option 60) and sends back OFFER, which also includes the same Vendor Class Identifier. This makes it possible to notify the IP Phone
1140E with SIP Firmware that the server is IP Phone-aware, and that it is safe to accept the offer from the server.
Every Nortel IP Phone E with SIP Firmware fills in the Vendor Class
ID option of the DHCPDISCOVER and DHCPREQUEST messages with the null-terminated, ASCII-encoded string Nortel-SIP-Phone-A, where A
identifies the version number of the information format of the IP Phone.
The Class Identifier Nortel-SIP-Phone-A must be unique in the DHCP
server domain.
The unique DHCP configuration is required to allow the DHCP server to respond with a unique Option 66 parameter to the IP Phone E with
SIP Firmware.
Note: The DHCP standard defines Option 66 as the bootp server address in a string. The meaning of the bootp server address is extended in Nortel IP Phone E with SIP Firmware to include the provisioning server address. The string in the DHCP offer for Option can be
•
the numeric IP address or name of the TFTP server or the URI (if
FTP or HTTP protocol is used) of the provisioning server in the form of
://
For example:
http://mydomain.com/SIP_phone
SIP Firmware Release 1.1 for IP Phone E Administration
NN43113-300 Standard May Copyright © 2008, Nortel Networks

60
Configure the DHCP server
If provisioning server authentication is required, the user credential must be embedded in the URI in the form of
://[:
@]
URL>[:port][/path]
For example,
ftp://www.mydomain.com/ABC or ftp://myuserid:mypass@ftp.mydo- main.com:21/ABC

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