Cisco Systems 8961 manual See the LLDP-MED and Cisco Discovery Protocol, White paper, Sip

Chapter 1 An Overview of the Cisco Unified IP Phone

What Networking Protocols are Used?

Table 1-4	Supported Networking Protocols on the Cisco Unified IP Phone (continued)
Networking Protocol		Purpose	Usage Notes
Link Layer Discovery		LLDP-MED is an extension of the LLDP	The Cisco Unified IP Phone supports LLDP-MED
Protocol-Media Endpoint		standard developed for voice products.	on the SW port to communicate information such as:
Devices (LLDP-MED)			•	Voice VLAN configuration
			•	Device discovery
			•	Power management
			•	Inventory management
			For more information about LLDP-MED support,
			see the LLDP-MED and Cisco Discovery Protocol
			white paper:
			http://www.cisco.com/en/US/tech/tk652/tk701/tech
			nologies_white_paper0900aecd804cd46d.shtml
Real-Time Transport		RTP is a standard protocol for transporting	Cisco Unified IP Phones use the RTP protocol to
Protocol (RTP)		real-time data, such as interactive voice	send and receive real-time voice traffic from other
		and video, over data networks.	phones and gateways.
Real-Time Control		RTCP works in conjunction with RTP to	RTCP is disabled by default, but you can enable it
Protocol (RTCP)		provide QoS data (such as jitter, latency,	on a per phone basis by using Cisco Unified
		and round trip delay) on RTP streams.	Communications Manager.
Session Description		SDP is the portion of the SIP protocol that	SDP capabilities, such as codec types, DTMF
Protocol (SDP)		determines which parameters are available	detection, and comfort noise, are normally
		during a connection between two	configured on a global basis by Cisco Unified
		endpoints. Conferences are established by	Communications Manager or Media Gateway in
		using only the SDP capabilities that are	operation. Some SIP endpoints may allow these
		supported by all endpoints in the	parameters to be configured on the endpoint itself.
		conference.
Session Initiation Protocol		SIP is the Internet Engineering Task Force	Like other VoIP protocols, SIP is designed to
(SIP)		(IETF) standard for multimedia	address the functions of signaling and session
		conferencing over IP. SIP is an	management within a packet telephony network.
		ASCII-based application-layer control	Signaling allows call information to be carried
		protocol (defined in RFC 3261) that can be	across network boundaries. Session management
		used to establish, maintain, and terminate	provides the ability to control the attributes of an
		calls between two or more endpoints.	end-to-end call.
Transmission Control		TCP is a connection-oriented transport	Cisco Unified IP Phones use TCP to connect to
Protocol (TCP)		protocol.	Cisco Unified Communications Manager and to
			access XML services.
Transport Layer Security		TLS is a standard protocol for securing	When security is implemented, Cisco Unified IP
		and authenticating communications.	Phones use the TLS protocol when securely
			registering with Cisco Unified Communications
			Manager.

	Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 8.5 (SIP)
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