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Cisco 8851 Guide

Cisco 8851
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Description and Default ValueParameter
Enables or disables DNS caching. When enabled, the DNS query results are cached.
The phone retrieves the local DNS cache until the local cache is expired. When disabled,
the phone always performs DNS queries.
Perform one of the following:
• In the phone configuration file with XML(cfg.xml), enter a string in this format:
<DNS_Caching_Enable ua="na">Yes</DNS_Caching_Enable>
• In the phone web interface, set this field to Yes or No to enable or disable DNS
caching.
Allowed values: Yes|No
Default: Yes
DNS Caching
Enable
Allows you to select speed and duplex of the network port. Values are:
• Auto
• 10 HALF
• 10 FULL
• 100 HALF
• 100 FULL
• 1000 FULL
Perform one of the following:
• In the phone configuration file with XML(cfg.xml), enter a string in this format:
<Switch_Port_Config ua="na">AUTO</Switch_Port_Config>
• On the phone web interface, select the speed for the port or select Auto to allow
the system to select the speed.
Default: Auto
Switch Port Config
Cisco IP Phone 8800 Series Multiplatform Phone Administration Guide for Release 11.3(1) and Later
162
Cisco IP Phone Configuration
Parameters for Optional Network Configuration

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Cisco 8851 Specifications

General IconGeneral
Resolution800 x 480 pixels
Network InterfacesDual Gigabit Ethernet ports
Headset PortYes
AudioWideband audio
Ethernet10/100/1000 Mbps
USBYes, USB 2.0
PowerIEEE 802.3af/at Power over Ethernet (PoE)
ProtocolsSIP
PoEYes
Codec SupportG.711, G.722, G.729, iLBC
Headset ConnectorRJ9
LinesUp to 5 lines
Dimensions229 x 256 x 41 mm (excluding foot stand)
Weight1.2 kg

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