User's Manual

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Cisco Unified IP Phone Administration Guide for Cisco Unified Communications Manager 8.6 (SCCP and SIP)
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Chapter 1 An Overview of the Cisco Unified IP Phones
What Networking Protocols are Used?
IPv6 Support on Cisco Unified IP Phones
The Cisco Unified IP Phones uses the internet protocol to provide voice communication over the
network. Because it uses a 32-bit address, Internet Protocol version 4 (IPv4) cannot meet the increased
demands for unique IP addresses for all devices that can connect to the internet. Internet Protocol version
Session Initiation Protocol
(SIP)
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.
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.
You can configure the Cisco Unified IP Phones to
use either SIP or Skinny Client Control Protocol
(SCCP). Cisco Unified IP Phones do not support the
SIP protocol when the phones are operating in IPv6
address mode.
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.
Cisco Unified IP Phones use SCCP for call control.
You can configure the Cisco Unified
IP Phone to
use either SCCP or Session Initiation Protocol
(SIP).
Transmission Control
Protocol (TCP)
TCP is a connection-oriented transport
protocol.
Cisco Unified IP Phones use TCP to connect to
Cisco Unified Communications Manager and to
access XML services.
Transport 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
Communications Manager.
For more information, see Cisco Unified
Communications Manager Security Guide.
Trivial File Transfer
Protocol (TFTP)
TFTP allows you to transfer files over the
network.
On the Cisco Unified IP Phones, TFTP
enables you to obtain a configuration file
specific to the phone type.
TFTP requires a TFTP server in your network,
which can be automatically identified from the
DHCP server. If you want a phone to use a TFTP
server other than the one specified by the DHCP
server, you must manually assign the IP address of
the TFTP server by using the Network
Configuration menu on the phone.
For more information, see Cisco TFTP in the Cisco
Unified Communications Manager System Guide.
User Datagram Protocol
(UDP)
UDP is a connectionless messaging
protocol for delivery of data packets.
Cisco Unified IP Phones transmit and receive RTP
streams, which utilize UDP.
Table 1-2 Supported Networking Protocols on the Cisco Unified IP Phones (continued)
Networking Protocol Purpose Usage Notes