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Operational Features
41-001343-02 REV04 – 05.2014 5-77
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" network-
ing.
• Extended and automated power management of Power over Ethernet endpoints.
• Inventory management, allowing network administrators to track their network devices, and determine their character-
istics (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 Identifica-
tion Number (ELIN), sent by the switch, as a caller ID for making emergency calls.
Aastra IP Phones have a 32 second time-out for listening to LLDP-MED responses when the phone is booting up. If LLDP-
MED responses are received after this initial listening period, the phone will ignore the response. Administrators can con-
figure this time-out interval using the "lldp startinterval" parameter. This parameter is only valid during the phone
bootup process and it will control the LLDP-MED time-out interval where the phone sends LLDP-MED advertisements and
listens for the LLDP-MED responses from the switch before proceeding to the DHCP stage. The default value of this param-
eter is 32 seconds.
Administrators can also now configure the optional Link Layer Discovery Protocol for Media Endpoint Devices (LLDP-MED)
Inventory Management type-length-value (TLV) sets. Using the “lldp optional inventory management tlv” parameter,
Administrators can configure the phone to either send all Inventory Management TLV (1) sets or to send none (0) . The
default for this parameter is (1).
The following table identifies the configuration parameters for LLDP and ELIN and which method you can use to configure
each parameter. This table also indicates whether the parameters can be configured by an Administrator, a User, or both.
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.
Parameter Method of Configuration Who Can Configure
lldp Configuration Files Administrator
lldp interval Configuration Files Administrator
use lldp elin Configuration Files Administrator
lldp startinterval Configuration Files Administrator
lldp optional inventory management tlv Configuration Files Administrator
LLDP Support IP Phone UI Administrator
LLDP Aastra Web UI Administrator
LLDP Packet Interval Aastra Web UI Administrator