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Usage Notes
Purpose
Network Protocol
Cisco IP Phones use the RTP
protocol to send and receive real-time
voice traffic from other phones and
gateways.
RTP is a standard protocol for
transporting real-time data, such as
interactive voice and video, over data
networks.
Real-Time Transport
Protocol (RTP)
RTCP is disabled by default.
RTCP works in conjunction with RTP to
provide QoS data (such as jitter, latency,
and round trip delay) on RTP streams.
Real-Time Control
Protocol (RTCP)
SDP capabilities, such as codec
types, DTMF detection, and comfort
noise, are normally configured on a
global basis by a Third-Party Call
Control System or a Media Gateway
in operation. Some SIP endpoints
may allow configuration of these
parameters on the endpoint itself.
SDP is the portion of the SIP protocol
that determines which parameters are
available during a connection between
two endpoints. Conferences are
established by using only the SDP
capabilities that all endpoints in the
conference support.
Session Description
Protocol (SDP)
Like other VoIP protocols, SIP is
designed to address the functions of
signaling and session management
within a packet telephony network.
Signaling allows call information to
be carried across network boundaries.
Session management provides the
ability to control the attributes of an
end-to-end call.
SIP is the Internet Engineering Task
Force (IETF) standard for multimedia
conferencing over IP. SIP is an
ASCII-based application-layer control
protocol (defined in RFC 3261) that can
be used to establish, maintain, and
terminate calls between two or more
endpoints.
Session Initiation Protocol
(SIP)
Cisco IP Phones use SRTP for media
encryption.
SRTP is an extension of the Real-Time
Protocol (RTP) Audio/Video Profile and
ensures the integrity of RTP and
Real-Time Control Protocol (RTCP)
packets providing authentication,
integrity, and encryption of media packets
between two endpoints.
Secure Real-Time Transfer
protocol (SRTP)
—
TCP is a connection-oriented transport
protocol.
Transmission Control
Protocol (TCP)
When security is implemented, Cisco
IP Phones use the TLS protocol when
securely registering with the
third-party call control system.
TLS is a standard protocol for securing
and authenticating communications.
Transport Layer Security
(TLS)
Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide
17
Network Protocols
Содержание IP Phone 6841
Страница 15: ...P A R T I About the Cisco IP Phone Cisco IP Phone Hardware page 3 Technical Details page 11 ...
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Страница 34: ...Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide 20 External Devices ...
Страница 35: ...P A R T II Phone Installation Cisco IP Phone Installation page 23 Third Party Call Control Setup page 61 ...
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Страница 79: ...P A R T III Phone Accessories Cisco IP Phone Accessories page 67 Wall Mount Kit page 71 ...
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Страница 84: ...Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide 70 Headsets ...
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Страница 146: ...Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide 132 Configure the XML Directory Service ...
Страница 147: ...P A R T V Phone Troubleshooting Monitoring Phone Systems page 135 Troubleshooting page 209 Maintenance page 221 ...
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Страница 222: ...Cisco IP Phone 6800 Series Multiplatform Phones Administration Guide 208 Cisco IP Phone Web Page ...