Requested Device Settings parameters

Full DHCP mode
61
Rebinding interval
Implementation varies according to DHCP server.
59
Provisioning server
Used for delivering the provisioning server IP address.
This parameter can contain either IP address or a URL to the provisioning server or folder.
66
DHCP VLAN Auto Discovery
Configuring a server for Voice VLAN Discovery is optional. This configuration is done in addition to any configuration done for Full DHCP
or Partial DHCP and it is required only when you are configuring the VLAN
Auto Discovery in the Device Settings menu on the IP Phone 1140E.
Auto Voice VLAN Discovery is only possible in Full and Partial DHCP mode.
VLAN Auto Discovery configuration is useful in a network with separate
Data VLAN for traffic (commonly used for PC-to-PC communication) and
Voice VLAN for VoIP traffic with different priorities.
The VLAN Auto Discovery is a two-step process. DISCOVER is sent to the DHCP server for available Voice VLAN IDs.
The DHCP server sends an OFFER with the available Voice VLAN
IDs. If the Data VLAN ID has been manually provisioned in the Device
Settings of the IP Phone E, DHCP DISCOVER is tagged with the
Data VLAN ID otherwise, it is untagged.
2. DISCOVER is sent to the DHCP server for all of the DHCP required parameters. However, this DISCOVER is tagged with the Voice VLAN
obtained instep 1.
DHCP VLAN Auto Discovery requires a Nortel-SIP-Phone-aware
DHCP server. All DHCP requests carry the Vendor Class Identifier,
Nortel-SIP-Phone-A, to allow the DHCP server to identify that the requests are coming from an IP Phone E with SIP Firmware.
DHCP Auto Discovery returns Voice VLAN IDs. The DHCP protocol provides no standard option for VLAN ID requests. Separate DHCP
vendor-specific entry is needed for DHCP VLAN Auto Discovery to convey the VLAN information to the IP Phone. DHCP VLAN Auto Discovery uses one of the reserved for site-specific use DHCP options for VLAN list retrieval. At least one of the following Nortel site-specific options must be returned by the DHCP server as part of each DHCPOFFER and DHCPACK
message for the IP Phone to accept these messages as valid 43, 128, 131,
144, 157, 188, 191, 205, 219, 223, 232, 247, SIP Firmware Release 1.1 for IP Phone E Administration
NN43113-300 Standard May Copyright © 2008, Nortel Networks

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Configure the DHCP server
After multiple VLAN IDs are returned from the DHCP server, the IP Phone
1140E tries to connect to each of the VLANs, following the order in which
VLAN IDs are specified in the DHCP option.
The format of the field for DHCP VLAN Auto Discovery is Type, length, and data, described in the following sections.

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