Nortel 1120E Administration Manual

Also see for Nortel IP Phone 1120E: User guide Installation and operation User guide Quick reference guide Installation and operation guide

Contents

Nortel 1120E Administration Manual Manual pdf 61 page image

Full DHCP mode 61Rebinding interval Implementation variesaccording to DHCP server.59Provisioning server Used for delivering theprovisioning server IP address.This parameter can containeither IP address or a URL tothe provisioning server or folder.66DHCP VLAN Auto DiscoveryConfiguring a server for Voice VLAN Discovery is optional. Thisconfiguration is done in addition to any configuration done for Full DHCPor Partial DHCP and it is required only when you are configuring the VLANAuto Discovery in the Device Settings menu on the IP Phone 1120E.Auto Voice VLAN Discovery is only possible in Full and Partial DHCP mode.VLAN Auto Discovery configuration is useful in a network with separateData VLAN for traffic (commonly used for PC-to-PC communication) andVoice 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 DeviceSettings of the IP Phone 1120E, DHCP DISCOVER is tagged with theData VLAN ID; otherwise, it is untagged.)2. DISCOVER is sent to the DHCP server for all of the DHCP requiredparameters. However, this DISCOVER is tagged with the Voice VLANobtained in step 1.DHCP VLAN Auto Discovery requires a Nortel-SIP-Phone-awareDHCP server. All DHCP requests carry the Vendor Class Identifier,Nortel-SIP-Phone-A, to allow the DHCP server to identify that the requestsare coming from an IP Phone 1120E with SIP Firmware.DHCP Auto Discovery returns Voice VLAN IDs. The DHCP protocolprovides no standard option for VLAN ID requests. Separate DHCPvendor-specific entry is needed for DHCP VLAN Auto Discovery to conveythe VLAN information to the IP Phone. DHCP VLAN Auto Discoveryuses one of the reserved for site-specific use DHCP options for VLAN listretrieval. At least one of the following Nortel site-specific options must bereturned by the DHCP server as part of each DHCPOFFER and DHCPACKmessage for the IP Phone to accept these messages as valid; 43, 128, 131,144, 157, 188, 191, 205, 219, 223, 232, 247, 251.SIP Firmware Release 1.1 for IP Phone 1120E AdministrationNN43112-300 02.03 Standard27 May 2008Copyright © 2008, Nortel Networks.