User's Manual

Parameter requested by the
IP Deskphone
Description DHCP server option
DNS domain Implementation varies
according to DHCP server.
15
Lease time Implementation varies
according to DHCP server.
51
Renewal time Implementation varies
according to DHCP server.
58
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 required only
when you are configuring the VLAN Auto Discovery in the Device Settings menu on the IP
Deskphone.
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:
1. 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 Deskphone, 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 in step 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 Deskphone with SIP Software.
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 Deskphone. 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 Avaya site-specific options must be returned by the DHCP server
DHCP VLAN Auto Discovery
SIP Software for Avaya 1100 Series IP Deskphones-Administration November 2012 111