Administrator’s Guide for SIP-T4X IP Phones
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LLDP-MED (Media Endpoint Discovery)
LLDP-MED is published by the Telecommunications Industry Association (TIA). It is an
extension to LLDP that operates between endpoint devices and network connectivity
devices. LLDP-MED provides the following capabilities for IP phones:
Capabilities Discovery -- allows LLDP-MED IP phones to determine the capabilities
that the connected switch supports and has enabled.
Network Policy -- provides voice VLAN configuration to notify IP phones which VLAN
to use and QoS-related configuration for voice data. It provides a ―plug and play‖
network environment.
Power Management -- provides information related to how IP phones are powered,
power priority, and how much power IP phones need.
Inventory Management -- provides a means to effectively manage IP phones and
their attributes such as model number, serial number and software revision.
TLVs supported by IP phones are summarized in the following table:
TLV Type
TLV Name
Description
Mandatory TLVs
Chassis ID
The network address of the IP phone.
Port ID
The MAC address of the IP phone.
Time To Live
Seconds until data unit expires.
The default value is 60s.
End of LLDPDU
Marks end of LLDPDU.
Optional TLVs
System Name
Name assigned to the IP phone.
The default value is ―yealink‖.
System Description
Description of the IP phone.
The default value is ―yealink‖.
System Capabilities
The supported and enabled phone
capabilities.
The supported capabilities are Bridge,
Telephone and Router.
The enabled capabilities are Bridge and
Telephone by default.
Port Description
Description of port that sends data unit.
The default value is ―WAN PORT‖.
IEEE Std 802.3
Organizationally
Specific TLV
MAC/PHY
Configuration/Status
Duplex and bit rate settings of the IP
phone.
The Auto Negotiation is supported and
enabled by default.
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