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B2BUA
A back-to-back user agent (B2BUA) is a logical network element in Session Initiation Protocol
Session Initiation Protocol
(SIP) applications.[1] SIP is a signaling protocol to manage multimedia Voice over Internet Protocol
Voice over Internet Protocol
(VoIP) telephone calls. A back-to-back user agent operates between both end points of a phone call or communications session and divides the communication channel into two call legs and mediates all SIP signaling between both ends of the call, from call establishment to termination. As all control messages for each call flow through the B2BUA, a service provider may implement value-added features available during the call. In the originating call leg the B2BUA acts as a user agent server (UAS) and processes the request as a user agent client (UAC) to the destination end, handling the signaling between end points back-to-back. A B2BUA maintains complete state for the calls it handles
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Voice Over Internet Protocol
Voice over Internet Protocol
Internet Protocol
(also voice over IP, VoIP or IP telephony) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet
Internet
Protocol (IP) networks, such as the Internet. The terms Internet
Internet
telephony, broadband telephony, and broadband phone service specifically refer to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN). The steps and principles involved in originating VoIP telephone calls are similar to traditional digital telephony and involve signaling, channel setup, digitization of the analog voice signals, and encoding. Instead of being transmitted over a circuit-switched network, the digital information is packetized, and transmission occurs as IP packets over a packet-switched network
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Signaling Gateway
A signaling gateway is a network component responsible for transferring signaling messages (i.e. information related to call establishment, billing, location, short messages, address conversion, and other services) between Common Channel Signaling (CCS) nodes that communicate using different protocols and transports. Transport conversion is often from SS7 to IP. A SIGTRAN Signaling Gateway is a network component that performs packet level translation of signaling from common channel signaling (based upon SS7) to SIGTRAN signaling (based upon IP). The concept of the SIGTRAN signaling gateway was introduced in the IETF document: RFC 2719: Architectural Framework for Signaling Transport. A signaling gateway can be implemented as an embedded component of some other network element, or can be provided as a stand-alone network element. For example: a signaling gateway is often part of a softswitch in modern VoIP deployments
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User Agent
In computing, a user agent is software (a software agent) that is acting on behalf of a user. One common use of the term refers to a web browser telling a website information about the browser and operating system. This allows the website to customize content for the capabilities of a particular device, but also raises privacy issues. There are other uses of the term "user agent". For example, an email reader is a mail user agent. In many cases, a user agent acts as a client in a network protocol used in communications within a client–server distributed computing system. In particular, the Hypertext Transfer Protocol
Hypertext Transfer Protocol
(HTTP) identifies the client software originating the request, using a user-agent header, even when the client is not operated by a user. The Session Initiation Protocol (SIP) protocol (based on HTTP) followed this usage
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Special
Special
Special
or specials may refer to:Contents1 Music 2 Film and television 3 Other uses 4 See alsoMusic[edit] Special
Special
(album), a 1992
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Session Border Controller
A session border controller (SBC) is a device regularly deployed in Voice over Internet Protocol
Voice over Internet Protocol
(VoIP) networks to exert control over the signaling and usually also the media streams involved in setting up, conducting, and tearing down telephone calls or other interactive media communications. Early deployments of SBCs were focused on the borders between two service provider networks in a peering environment. This role has now expanded to include significant deployments between a service provider's access network and a backbone network to provide service to residential and/or enterprise customers.[1] The term "session" refers to a communication between two parties – in the context of telephony, this would be a call
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Session Initiation Protocol
The Session Initiation Protocol
Session Initiation Protocol
(SIP) is a communications protocol for signaling and controlling multimedia communication sessions in applications of Internet telephony
Internet telephony
for voice and video calls, in private IP telephone systems, as well as in instant messaging over Internet Protocol
Internet Protocol
(IP) networks. The protocol defines the specific format of messages exchanged and the sequence of communications for cooperation of the participants
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Back-to-back User Agent
A back-to-back user agent (B2BUA) is a logical network element in Session Initiation Protocol
Session Initiation Protocol
(SIP) applications.[1] SIP is a signaling protocol to manage multimedia Voice over Internet Protocol
Voice over Internet Protocol
(VoIP) telephone calls. A back-to-back user agent operates between both end points of a phone call or communications session and divides the communication channel into two call legs and mediates all SIP signaling between both ends of the call, from call establishment to termination. As all control messages for each call flow through the B2BUA, a service provider may implement value-added features available during the call. In the originating call leg the B2BUA acts as a user agent server (UAS) and processes the request as a user agent client (UAC) to the destination end, handling the signaling between end points back-to-back. A B2BUA maintains complete state for the calls it handles
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