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Operational Features
41-001160-03, Rev 00, Releaes 2.4 5-97
Configuring Operational Features
Link Layer Discovery Protocol for Media Endpoint Devices (LLDP-MED)
and Emergency Location Identification Number (ELIN)
The IP Phones support Link Layer Discovery Protocol for Media Endpoint
Devices (LLDP-MED). LLDP-MED is designed to allow for things such as:
• Auto-discovery of LAN policies (such as VLAN, Layer 2 Priority and
Diffserv settings) leading to "plug and play" networking.
• Extended and automated power management of Power over Ethernet
endpoints.
• Inventory management, allowing network administrators to track their
network devices, and determine their characteristics (manufacturer, software
and hardware versions, serial / asset number).
On the IP Phones, LLDP-MED performs the following:
• Supports the MAC/PHY configuration (e.g. speed rate/duplex mode).
• Supports VLAN info from the network policy; this takes precedence over
manual settings.
• Allows you to enable/disable LLDP-MED if required.
• Allows you to configure time interval between successive LLDP Data Unit
(LLDPDU) frames.
• Allows LLDP packets to be received from the LAN port.
• Allows the phone to use the location information, Explicit Congestion
Notification (ECN) Emergency Location Identification Number (ELIN), sent
by the switch, as a caller ID for making emergency calls.
Note: If the phone receives location information in ECN ELIN format
(10 to 25 numeric string), the phone replaces the caller ID SIP header
with the ECN ELIN value and the SIP URI does not change. The phone
determines if this is an emergency number by checking the emergency
dial plan configured on the phone.
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