Cisco Systems ATA 186, ATA 188 manual GL-6

Glossary

SIP

SIP endpoint

SLIC

SOHO

Session Initiation Protocol. Protocol developed by the IETF MMUSIC Working Group as an alternative to H.323. SIP features are compliant with IETF RFC 2543, published in March 1999. SIP equips platforms to signal the setup of voice and multimedia calls over IP networks.

A terminal or gateway that acts as a source or sink of Session Initiation Protocol (SIP) voice data. An endpoint can call or be called, and it generates or terminates the information stream.

Subscriber Line Interface Circuit. An integrated circuit (IC) providing central office-like telephone interface functionality.

Small office, home office. Networking solutions and access technologies for offices that are not directly connected to large corporate networks.

T

TCP	Transmission Control Protocol. Connection-oriented transport layer protocol that provides reliable
	full-duplex data transmission. TCP is part of the TCP/IP protocol stack.
TFTP	Trivial File Transfer Protocol. Simplified version of FTP that allows files to be transferred from one
	computer to another over a network, usually without the use of client authentication (for example,
	username and password).

TN power systems A TN power system is a power distribution system with one point connected directly to earth (ground).

	The exposed conductive parts of the installation are connected to that point by protective earth
	conductors.
TOS	Type of service. See CoS.

U

UAC

UAS

User agent client. A client application that initiates the SIP request.

User agent server (or user agent). A server application that contacts the user when a SIP request is received, and then returns a response on behalf of the user. The response accepts, rejects, or redirects the request.

UDP	User Datagram Protocol. Connectionless transport layer protocol in the TCP/IP protocol stack. UDP
	is a simple protocol that exchanges datagrams without acknowledgments or guaranteed delivery,
	requiring that error processing and retransmission be handled by other protocols. UDP is defined in
	RFC 768.
user agent	See UAS.

V

VAD		Voice activity detection. When enabled on a voice port or a dial peer, silence is not transmitted over
		the network, only audible speech. When VAD is enabled, the sound quality is slightly degraded but
		the connection monopolizes much less bandwidth.
		Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SCCP)
	GL-6	OL-3141-01