Yealink SIP-T2XP, Administrator'S Manual

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Administrator’s Guide for SIP-T2xP IP Phones
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Parameters Permitted Values Default
Description:
Configures whether preferentially to use the static DNS cache for domain name
resolution of the SIP server for account X.
0-Use domain name resolution from the DNS server preferentially
1-Use static DNS cache preferentially
X ranges from 1 to 6 (for SIP-T28P).
X ranges from 1 to 3 (for SIP-T26P/T22P).
X ranges from 1 to 2 (for SIP-T20P).
Example:
account.1.static_cache_pri = 1
Web User Interface:
None
Phone User Interface:
None
LLDP (Linker Layer Discovery Protocol) is a vendor-neutral Link Layer protocol, which
allows IP phones to receive and/or transmit device-related information from/to directly
connected devices on the network that are also using the protocol, and store the
information 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 the 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 specifically provides support for voice over IP (VoIP) applications
and provides the following capabilities:

Capabilities Discovery -- allows 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.