Cisco IP Phone 6851

Usage NotesPurposeNetwork Protocol
Web applications with both HTTP
and HTTPS support have two URLs
configured. Cisco IP Phones that
support HTTPS choose the HTTPS
URL.
A lock icon is displayed to the user
if the connection to the service is via
HTTPS.
Hypertext Transfer Protocol Secure
(HTTPS) is a combination of the
Hypertext Transfer Protocol with the
SSL/TLS protocol to provide encryption
and secure identification of servers.
Hypertext Transfer
Protocol Secure (HTTPS)
To communicate with IP, network
devices must have an assigned IP
address, subnet, and gateway.
IP addresses, subnets, and gateways
identifications are automatically
assigned if you are using the Cisco
IP Phone with Dynamic Host
Configuration Protocol (DHCP). If
you are not using DHCP, you must
manually assign these properties to
each phone locally.
IP is a messaging protocol that addresses
and sends packets across the network.
Internet Protocol (IP)
The Cisco IP Phone supports LLDP
on the PC port.
LLDP is a standardized network
discovery protocol (similar to CDP) that
is supported on some Cisco and
third-party devices.
Link Layer Discovery
Protocol (LLDP)
The Cisco IP Phone supports
LLDP-MED on the SW port to
communicate information such as:
•
Voice VLAN configuration
•
Device discovery
•
Power management
•
Inventory management
For more information about
LLDP-MED support, see the
LLDP-MED and Cisco Discovery
Protocol white paper at this URL:
http://www.cisco.com/en/US/tech/
tk652/tk701/technologies_white_
paper0900aecd804cd46d.shtml
LLDP-MED is an extension of the LLDP
standard developed for voice products.
Link Layer Discovery
Protocol-Media Endpoint
Devices (LLDP-MED)
Cisco IP Phones have an NTP client
integrated into the software.
NTP is a networking protocol for clock
synchronization between computer
systems over packet-switched,
variable-latency data networks.
Network Transport
Protocol (NTP)
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
16
Network Protocols