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
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. |
| |
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 (SIP) | |
|
|
| ||
|
|
|
|
|
|
|
| ||
