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Cisco Unified IP Phone 6901 and 6911 Administration Guide for Cisco Unified Communications Manager 8.5 (SCCP and SIP)
OL-23874-01
Chapter 1 An Overview of the Cisco Unified IP Phone
What Networking Protocols are Used?
What Networking Protocols are Used?
Cisco Unified IP Phones support several industry-standard and Cisco networking protocols required for
voice communication.
Table 1-3 provides an overview of the networking protocols that the
Cisco Unified IP Phone 6901 and 6911 support.
14 Handset Phone handset.
Ta b l e 1-3 Supported Networking Protocols on the Cisco Unified IP Phone
Networking Protocol Purpose Usage Notes
Cisco Audio Session
Tunneling (CAST)
(Cisco Unified IP Phone
6911 only)
The CAST protocol allows IP phones and
associated applications behind the phone
to discover and communicate with the
remote endpoints without requiring
changes to the traditional signaling
components like Cisco Unified
Communications Manager and gateways.
The CAST protocol allows separate
hardware devices to synchronize related
media and it allows PC applications to
augment non Video capable phones to
become video enabled by using the PC as
the video resource.
—
Cisco Discovery Protocol
(CDP)
CDP is a device-discovery protocol that
runs on all Cisco-manufactured
equipment.
Using CDP, a device can advertise its
existence to other devices and receive
information about other devices in the
network.
The Cisco Unified IP Phone uses CDP to
communicate information such as auxiliary VLAN ID,
per port power management details, and Quality of
Service (QoS) configuration information with the
Cisco Catalyst switch.
Dynamic Host
Configuration Protocol
(DHCP)
DHCP dynamically allocates and assigns
an IP address to network devices.
DHCP enables you to connect an IP phone
into the network and have the phone
become operational without your needing
to manually assign an IP address or to
configure additional network parameters.
DHCP is enabled by default. If disabled, you must
manually configure the IP address, subnet mask,
gateway, and a TFTP server on each phone locally.
Cisco recommends that you use DHCP custom
option 150. With this method, you configure the
TFTP server IP address as the option value. For
additional supported DHCP configurations, go to
the
Dynamic Host Configuration Protocol chapter
and the Cisco TFTP chapter in the Cisco Unified
Communications Manager System Guide.
Note If you cannot use option 150, you may try
using DHCP option 66.
Hypertext Transfer
Protocol (HTTP)
HTTP is the standard way of transferring
information and moving documents across
the Internet and the web.
Cisco Unified IP Phones use HTTP for
troubleshooting purposes.