Chapter1 An Overview of the Cisco Unified IP Phone
What Networking Protocols Are Used?
1-6
Cisco Unified IP Phone 7906G and 7911G Administration Guide for Cisco Unified CallManager
OL-10008-01
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 UnifiedIP 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
Protocol (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.
Secure Real-Time
Transport Protocol
(SRTP)
SRTP is available in addition to RTP.
SRTP adds security by encrypting
media streams during data transport.
For SRTP to work, the phone or
phones being called must also
support SRTP or else those phones
cannot decrypt the secure media
stream.
Skinny Client Control
Protocol (SCCP)
SCCP includes a messaging set that
allows communications between call
control servers and endpoint clients
such as IP Phones. SCCP is
proprietary to Cisco Systems.
Cisco Unified IP Phones use SCCP
for call control.
Transmission Control
Protocol (TCP)
TCP is a connection-oriented
transport protocol.
Cisco Unified IP Phones use TCP to
connect to
Cisco UnifiedCallManager and to
access XML services.
Transpor t Layer
Security (TLS)
TLS is a standard protocol for
securing and authenticating
communications.
When security is implemented,
Cisco Unified IP Phones use the TLS
protocol when securely registering
with Cisco Unified CallManager.
Table1-1 Supported Networking Protocols on the CiscoUnified IP Phone (continued)
Networking Protocol Purpose Usage Notes