Yealink SIP-T38G, Руководство администратора

Страница: 170 / 402

Configuring Advanced Features
157
3. Select DNS-SRV from the pull-down list of Transport.
4. Click Confirm to accept the change.
LLDP (Linker Layer Discovery Protocol) is a vendor-neutral Link Layer protocol. It allows IP
phones to receive and/or transmit device-related information to directly connected
devices on the network that are also using the protocol, and store the information that is
learned about other devices. LLDP transmits information as packets called LLDP Data
Units (LLDPDUs). An LLDPDU consists of a set of Type-Length-Value (TLV) elements, each
of which contains a particular type of information about the device or port transmitting
it.
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 the IP phone:

Capabilities Discovery — allows LLDP-MED endpoints to determine the capabilities
that the connected device supports and has enabled.

Network Policy — provides voice VLAN configuration to notify a device 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 the device is powered,