Enable Audio Alert
When enabled, instructs the phone to play an audible alert starting 10 minutes before the time that the
Phone Off Time field specifies.
EnergyWise Domain
Specifies the EnergyWise domain that the phone is in.
EnergyWise Secret
Specifies the security secret password that is used to communicate within the EnergyWise domain.
Allow EnergyWise Overrides
Determines whether you allow the EnergyWise domain controller policy to send power-level updates
to the phones.
When a phone is sleeping, the power sourcing equipment (PSE) provides minimal power to the phone to
illuminate the Select key, and the Select key can be used to wake up the phone when it is sleeping.
Power Negotiation over LLDP
The phone and the switch negotiate the power that the phone consumes. Cisco Unified IP Phone 8961, 9951,
and 9971 operates at multiple power settings, which lowers power consumption when less power is available.
After a phone reboots, the switch locks to one protocol (CDP or LLDP) for power negotiation. The switch
locks to the first protocol (containing a power Threshold Limit Value [TLV]) that the phone transmits. If the
system administrator disables that protocol on the phone, the phone cannot power up any accessories because
the switch does not respond to power requests in the other protocol.
Cisco recommends that Power Negotiation always be enabled (default) when connecting to a switch that
supports power negotiation.
If Power Negotiation is disabled, the switch may disconnect power to the phone. If the switch does not support
power negotiation, disable the Power Negotiation feature before you power up accessories over PoE. When
the Power Negotiation feature is disabled, the phone can power the accessories up to the maximum that the
IEEE 802.3af-2003 standard allows.
When CDP and Power Negotiation are disabled, the phone can power the accessories up to 15.4W.
Note
Additional Information About Power
The documents in the following table provide more information on the following topics:
•
Cisco switches that work with Cisco Unified IP Phones
•
Cisco IOS releases that support bidirectional power negotiation
•
Other requirements and restrictions about power
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager
10.0 (SIP)
46
Cisco Unified IP Phone and telephony networks
Power Negotiation over LLDP
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