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Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP)
OL-15498-01
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 1-1 provides an overview of the networking protocols that the
Cisco Unified IP Phones 7960G and 7940G support.
Ta b l e 1-1 Supported Networking Protocols on the Cisco Unified IP Phone
Networking Protocol Purpose Usage Notes
Bootstrap Protocol
(BootP)
BootP enables a network device such as the
Cisco
Unified IP Phone to discover certain
startup information, such as its IP address.
If you are using BootP to assign IP addresses to
the Cisco
Unified IP Phone, the BOOTP Server
option shows “Yes” in the network configuration
settings on the phone.
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 it become operational
without you needing to manually assign an IP
address or configure additional required 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,
refer Cisco Unified
Communications Manager
System Guide.
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 the XML
services and for troubleshooting purposes.
Internet Protocol (IP) IP is a messaging protocol that addresses and
sends packets across the network.
To communicate using 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
Unified IP Phone with
Dynamic Host Configuration Protocol (DHCP).
If you are not using DHCP, you must manually
assign these properties to each phone locally.
Real-Time Transport
(RTP)
RTP is a standard protocol for transporting
real-time data, such as interactive voice and
video, over data networks.
Cisco Unified IP Phones use the RTP protocol to
send and receive real-time voice traffic from
other phones and gateways.
Session Initiation
Protocol (SIP)
SIP is an emerging standard for setting up
telephone calls, multimedia conferencing, and
other types of communications on the Internet.
Cisco Unified IP Phones use SCCP for call
control. You can configure the Cisco
Unified IP
Phone to use either SCCP or SIP.