| SBC (Smart Bitrate Control) |
The improved technique of video compression. Variable Keyframe Intervals (VKI) and multipass encoding are the underlying basis of SBC. Files created using this technique can easily be decoded by any MPEG4 video supporting codec.
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| SCTP (Stream Control Transmission) |
A part of SIGTRAN, functions as a transport layer with traffic control mechanism. Defined in RFC 2960, SCTP provides reliable message transfer and enhanced identification of errors.
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| Session |
Session is the duration for which a host is connected to the server for exchanging data packets. Session layers of the network protocol help establish a session between a host and its server.
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| SIGTRAN (Signaling Transport) |
The set of protocols that promotes reliable datagram service. SCTP, the protocol that allows sending traditional telephone calls over IP, is a part of SIGTRAN.
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| SIP (Session Initiation Protocol) |
SIP or Session Initiation Protocol is an IETF (see IETF) standard signaling protocol used for creating, modifying and terminating voice, video and data conferencing over packet-switched networks. VoIP systems incorporate SIP at the application layer to successfully integrate IP telephony with other Internet services. Some of the features of VoIP managed by SIP include call setup, routing, authentication, authorization and communication with different service providers.
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| Soft keys |
Buttons on a telephone handset that users can program themselves to perform certain functions. For example pressing specific keys followed by punching the digits of a telephone number allows programming that number for speed dialing.
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| Soft phone |
VoIP calls can be placed in several ways. You have the option of choosing from a special VoIP telephone, a regular telephone with a VoIP adapter or you can use your computer equipped with microphone, speakers and special software. PC based software solutions for VoIP calling are known as soft phones. These are relatively cheaper, but are not as convenient as VoIP-enabled telephones (hard phones).
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| Softswitch |
A softswitch, an important device to telephone networks, that routes calls from one phone line to another. With the evolution of this technology, the routing happens through computer software. A softswitch has two components called a media gateway and a call agent.
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| SS7 (Signaling System #7) |
A signaling protocol for setting up PSTN calls, defining the way information is exchanged between telephone networks and their individual entities. Defined in 1981 by ITU-T, SS7 in the US is commonly known as Common Channel Signaling System 7 (CCS7).
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