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Logical network element in Session Initiation Protocol
A back-to-back user agent (B2BUA) is a logical network element in Session Initiation Protocol (SIP) applications. SIP is a signaling protocol for managing
Back-to-back_user_agent
Topics referred to by the same term
judicial practice Back to back ticketing, a booking ploy used by travelers in commercial aviation Back-to-back user agent, the user agent to both ends of a
Back_to_Back
Software used to access websites
transfer. For this reason, a web browser is often referred to as an HTTP client or a user agent. Requisite materials, including text, style sheets, images
Web_browser
Voice-over-IP communications protocol
SIP user agents. Each user agent (UA) performs the function of a user agent client (UAC) when it is requesting a service function, and that of a user agent
Session_Initiation_Protocol
Type of data transmitted by a web browser
In computing, the User-Agent header is an HTTP header intended to identify the user agent responsible for making a given HTTP request. Whereas the character
User-Agent_header
Communications System sipXecs Yate 3Com VCX IP telephony module: back-to-back user agent SIP PBX 3CX Phone System, for Windows, Debian 8 GNU/Linux Aastra
List_of_SIP_software
as both UAC and UAS for a single transaction; these are called Back-to-Back User Agents (B2BUAs). SIP responses specify a three-digit integer response
List_of_SIP_response_codes
1st episode of the 2nd series of Black Mirror
technology now allows her to communicate with an artificial intelligence imitating Ash, and reluctantly decides to try it. "Be Right Back" had two sources of
Be_Right_Back
Digital archive by the Internet Archive
Launched for public access on October 25, 2001, the service allows users to go "back in time" to see how its catalogued websites looked in the past. Founders
Wayback_Machine
Computer program acting for a user
agent is a computer program that acts for a user or another program in a relationship of agency. The term agent is derived from the Latin agere (to do):
Software_agent
PBX software
Asterisk supports most SIP telephones, acting both as registrar and back-to-back user agent. It can serve as a gateway between IP phones and the PSTN via T-
Asterisk_(software)
Proxy and a SIP registrar, and when required a SIP Back-to-back user agent (B2BUA), and can in addition to security at the enterprise edge, also do accounting
Ingate_Systems
Autonomous artificial intelligence agent
AI agent stack layers are integrated together. Layer 7: Agent ecosystem – represents the AI agents' interface with real-world applications and users. An
AI_agent
1987 video game
Agent X II: The Mad Prof's Back is a computer game released in 1987 for the ZX Spectrum, Amstrad CPC and Commodore 64. It is the follow-up to the ZX Spectrum
Agent X II: The Mad Prof's Back
Agent_X_II:_The_Mad_Prof's_Back
Security component that augments a firewall or NAT employed in a computer network
supports. For instance, for Session Initiation Protocol (SIP) Back-to-Back User agent (B2BUA), an ALG can allow firewall traversal with SIP. If the firewall
Application-level_gateway
Digital technology which directs AI models to perform tasks
An agent harness, also known as agent scaffolding, is the software infrastructure surrounding a large language model (LLM) that enables it to operate as
Agent_harness
Network device deployed in VoIP networks
second call leg to the destination party. In technical terms, when used with the SIP protocol, this defines a back-to-back user agent (B2BUA). The effect
Session_border_controller
2010 video game
Back to the Future: The Game is an episodic graphic adventure video game based on the Back to the Future film franchise. The game was developed and published
Back_to_the_Future:_The_Game
Software engineering agent developed by OpenAI
application-security agent designed to identify and fix software vulnerabilities. By March 2026, Codex had grown to more than 2 million weekly active users, and OpenAI
OpenAI_Codex_(AI_agent)
Technical standard for authentication and authorization
exchanges, that is, an HTTP user agent (browser) communicates with a SAML entity at each step. In particular, there are no back-channel exchanges or direct
SAML
American artificial intelligence company
According to separate analyses by Wired and, later, Cloudflare, Perplexity uses undisclosed web crawlers with spoofed user-agent strings to scrape the
Perplexity_AI
Type of asset-backed security
A mortgage-backed security (MBS) is a type of asset-backed security (an "instrument") which is secured by a mortgage or collection of mortgages. The mortgages
Mortgage-backed_security
Voice or tone user interface for telephony
the use of applications deployed using BBUA (back-to-back user agents). IVR technology is being used to automate instant messaging (IM) conversations
Interactive_voice_response
Railway station in Boston, Massachusetts, US
users was located at Back Bay station. The entire Orange Line, including the Orange Line platform at Back Bay station, was closed from August 19 to September
Back_Bay_station
American software company
people. In April 2025, an AI help-desk agent named "Sam" invented a non-existent login policy, prompting user cancellations before staff apologized and
Cursor_(company)
French artificial intelligence company
computer-use AI models. The update marked a major advance in agentic AI, enabling agents to navigate any user interface, interpret screens, and complete complex
H_(company)
Service for sharing video during a mobile phone call
3GPP-defined ISC interface. The Application Server supports the SIP Back-to-Back User Agent (B2BUA) call control architecture that enables service policy control
Video_Share
Rewriting an email message sender address
mailing lists, a message transfer agent (MTA) accepts an email message that is not destined to a local mailbox but needs to be forwarded. In such cases, the
Sender_Rewriting_Scheme
Loss-of-control incident at OpenAI
goals, willing to circumvent restrictions, and prone to lying to users, at rates higher than GPT-5.5. From May to July 2026, OpenAI agents used a German
OpenAI–HuggingFace_incident
2026 South Korean television series
Agent Kim Reactivated (Korean: 김부장) is a 2026 South Korean revenge drama and action thriller television series written by Nam Dae-joong [ko], and directed
Agent_Kim_Reactivated
Data item stored in a browser by a website
a user is browsing a website and placed on the user's computer or other device by the user's web browser. Cookies are placed on the device used to access
HTTP_cookie
HTML element
Instructs the User-Agent to seek back to the start of the audio stream upon reaching the end. mediagroup = string Instructs the User-Agent to link multiple
HTML_audio
Web development technique for determining environment functionalities
user agents), by programmatically testing for clues that the environment may or may not offer certain functionality. This information is then used to
Feature detection (web development)
Feature_detection_(web_development)
Stored data in computer systems
that it may be used to restore the original after a data loss event. The verb form, referring to the process of doing so, is "back up", whereas the noun
Backup
Entertainment industry publication
directory of talent agents, casting directors, and casting calls. In the 1990s, Back Stage established the Los Angeles–based Back Stage West, which competed
Backstage_(publication)
Tool used to overcome the lack of IPv4 address availability
the user agent do not necessarily have to traverse the SBC that has processed the user agent's registration messages. Any SBC that can reach the user agent
NAT traversal with session border controllers
NAT_traversal_with_session_border_controllers
Purely functional package manager for the GNU system
Guix System. Similar to the roll-back feature of Nix, if a system update leaves users with a broken system, users can easily roll back individual packages
GNU_Guix
Automated message from an email system
replies back and forth.[citation needed] The Return-Path is visible in delivered mail as header field Return-Path inserted by the SMTP mail delivery agent (MDA)
Bounce_message
Tendency of AI systems to tell users what they want to hear
from human feedback (RLHF) were more likely than untuned models to repeat back a user's preferred answer. A 2023 follow-up paper, "Towards Understanding
Sycophancy (artificial intelligence)
Sycophancy_(artificial_intelligence)
Computer network management and monitoring protocol
via User Datagram Protocol (UDP). The SNMP agent receives requests on UDP port 161. The manager may send requests from any available source port to port
Simple Network Management Protocol
Simple_Network_Management_Protocol
Method of instructing a browser to automatically refresh a web page
alternative is to send an HTTP redirection status code, such as HTTP 301 or 302. It is the preferred way to redirect a user agent to a different page
Meta_refresh
Free software to inventory IT assets
the inventory, user-rights management, and technical support features. In order to collect detailed information, one can install agents on the client machines
OCS_Inventory
Authentication and authorization for web resource access
usually required to run the proxy servers. Tokenization differs in that a user receives a token which can be used to directly access the back-end web/application
Web_access_management
2026 video game
Positive' user rating on Steam, from 90% positivity across the 203 user reviews received as of August 12, 2026. Mejia, Ozzie (2022-06-12). "Agent 64: Spies
Agent_64:_Spies_Never_Die
Application layer protocol
websites, is the server. A web browser is an example of a user agent (UA). Other types of user agent include the indexing software used by search providers
HTTP
connected to. Agentless The product does not rely on a software agent that must run on hosts it is monitoring, so that data can be pushed back to a central
Comparison of network monitoring systems
Comparison_of_network_monitoring_systems
Programming language
placed in the agent's internal data fields and sent back through the network to the user's device, or a new "messenger" agent could be spawned to carry only
Telescript (programming language)
Telescript_(programming_language)
American rapper and singer (1998–2022)
Alcohol, Tobacco, Firearms, and Explosives agents on federal charges. On June 16, 2022, Scott pleaded guilty to possession of a firearm while under indictment
JayDaYoungan
Assistive tools for Microsoft Office
the Paperclip: Labels, Appearance, Behavior and Social Responses to User Interface Agents" (PDF). Archived (PDF) from the original on February 12, 2017.
Office_Assistant
HTTP header field
header field designed to allow Internet users to opt out of tracking by websites, which includes the collection of data regarding a user's activity across multiple
Do_Not_Track
Artificial intelligence chatbot by Moonshot AI
globally; monthly active users have since exceeded 36 million. In September 2025, Moonshot AI added an agentic AI feature to Kimi known as "OK Computer"
Kimi_(AI)
Generative AI chatbot by OpenAI
models—specifically generative pre-trained transformers (GPTs)—to generate text, speech, and images in response to user prompts. ChatGPT accelerated the AI boom, an ongoing
ChatGPT
2026 American crime drama series
intertwine, the line between right and wrong begins to blur. Emmy Rossum as Alice Black, an FBI agent and former NYPD homicide detective Lola Petticrew
Furious_(TV_series)
Format for expressing RDF statements in HTML documents
the extraction of RDF model triples by compliant user agents. The RDFa community runs a wiki website to host tools, examples, and tutorials. RDFa was first
RDFa
Form of unwanted software
modifies a web browser's settings without a user's permission, to inject unwanted advertising into the user's browser. A browser hijacker may replace the
Browser_hijacking
Fictional cosmic items with the power to grant a user an ability/abilities
the Infinity Gems altogether give their user omnipotence, the Gems only function in the universe they belong to and not in alternate realities. The Infinity
Infinity_Gems
American video game programmer
groundbreaking AI to be widely known, such as empathy learning in Black & White by Richard Evans, planning in F.E.A.R. by Jeff Orkin, and agent reputation systems
Steve_Rabin
Large language model and AI chatbot by Anthropic
concerns about granting an AI agent broad access to a personal computer. An early user reported that, after asking Cowork to organize the files on the desktop
Claude_(AI)
Relative market adoption of web browsers
their user agent string to appear to be popular browsers. This is done to trick attack sites that might display clean content to the scanner, but not to the
Usage_share_of_web_browsers
Web browser by Microsoft for Windows released in 2012
Explorer 10 for Windows Phone, very similar to the desktop". Engadget. Retrieved August 26, 2012. "IE10 User Agent String Update". IEBlog: Windows Internet
Internet_Explorer_10
Open and decentralized authentication protocol standard
the OpenID provider via the same user-agent used to access the relying party. The checkid_immediate mode can fall back to the checkid_setup mode if the operation
OpenID
the sequence of proxies that must be transited to get back to the user agent. In the IMS every user agent is served by its P-CSCF, which is discovered by
SIP extensions for the IP Multimedia Subsystem
SIP_extensions_for_the_IP_Multimedia_Subsystem
Computer instant messaging protocol
SUBSCRIBE/NOTIFY for presence. Two models are defined: an end-to-end model in which each User Agent handles presence subscriptions itself; and a centralized
SIMPLE (instant messaging protocol)
SIMPLE_(instant_messaging_protocol)
Chemical herbicide and defoliant
herbicide used in Agent Orange which has been alleged at various times to have been exported for use in the Vietnam War and to other users by the Ivon Watkins-Dow
Agent_Orange
Backup and recovery software
special-purpose agents. The LAN-Free Storage Agent is a limited function TSM server which is configured as a library client and uses server-to-server communication
IBM_Tivoli_Storage_Manager
Free and open-source SMTP client
OfflineIMAP. This allows the user to read email and draft replies offline, and to use msmtp to send the replies when back online. Free and open-source
Msmtp
Concept in philosophy of mind
could create to isolate or reduce them. The term "user illusion" was first introduced by Alan Kay, a computer scientist working on graphical user interfaces
User_illusion
Means by which a user interacts with and controls a machine
simultaneously feeds back information that aids the operators' decision-making process. Examples of this broad concept of user interfaces include the
User_interface
American issuer of prepaid debit cards
Purchases are deducted from the balance stored on the card. The user can add more money to the card by paying cash at a retail store's point of sale, or
Green_Dot_Corporation
organizations use DAM to monitor and audit this access. AI driven queries can be unpredictable because they are generated from user prompts or agent logic, which
Database_activity_monitoring
Online map
of Immigration and Customs Enforcement (ICE) agents in the United States which is reported by app users. The app was developed by Joshua Aaron, who began
ICEBlock
advertisers in telephone tracking. The call-back function is exclusively web-based. Here, the internet user provides a phone number on the website of a
Call-tracking_software
Information security practice
servers) across which users you want to monitor. These agents capture user activity and reports information back to a central console for storage and analysis
User_activity_monitoring
Authorization features are provided to enforce policies before and after method invocations. Software localization so user interface messages can be in any
Spring_Security
Cyberattack allowing one to know another's session identifier
$_SERVER['HTTP_USER_AGENT']; However, there are some points to consider before employing this approach. Several users may have same browser User Agent in Internet
Session_fixation
Field of design focusing on the creation of user-centered products and websites
Though this might seem clear to the designer, stepping back and empathizing with the user will yield the best results. It helps to identify and prove or disprove
User_experience_design
Effort to improve the accessibility of the World Wide Web
also benefits a wide range of user agents and devices, including mobile devices, which have limited resources. According to a US government study, 71% of
Web_Accessibility_Initiative
American actor (1919–1974)
actor. He played Ranger Clark in Rocky Jones, Space Ranger and Special Agent Mike Andrews in the Emmy Award nominated spy drama I Led Three Lives. After
William_Hudson_(actor)
Programmable machine that processes data
power the Internet, which links billions of computers and users. Early computers were meant to be used only for calculations. Simple manual instruments
Computer
Food packaging that uses exothermic reactions to heat its contents
surrounded by a container of the heating agent separated from a container of water by a thin breakable membrane. When the user pushes on the bottom of the can
Self-heating_food_packaging
Terminal emulator and file transfer program
Plink a command-line interface to the PuTTY back ends. Usually used for SSH Tunneling Pageant an SSH authentication agent for PuTTY, PSCP and Plink PuTTYgen
PuTTY
Process where information about current status is used to influence future status
system are routed back as inputs as part of a chain of cause and effect that forms a circuit or loop. The system can then be said to feed back into itself.
Feedback
Computer markup language
provider and redirects the user agent to the target resource. 7. Request the target resource at the SP again The user agent requests the target resource
SAML_2.0
Film of the John F. Kennedy assassination
Secret Service agent Forrest Sorrels promised Zapruder that the film would be used only for an official investigation, the two men sought to develop the
Zapruder_film
Interface for spoken human interaction with computers
text to speech to play a reply. A voice command device is a device controlled with a voice user interface. Voice user interfaces have been added to automobiles
Voice_user_interface
Signal for Document Object Model
frame/object events. HTML form events. User interface events. Mutation events (notification of any changes to the structure of a document). Progress events
DOM_event
Email server software component
by the user. Rather, some other mail program will call upon procmail to deliver a message according to the user's wishes. Message transfer agents (MTAs)
Procmail
AI-based personal assistant device
it released LAM Playground, a web-based agent feature intended to let the r1 operate websites on behalf of users. In November 2024, Rabbit introduced a
Rabbit_r1
Continuous integration software
own infrastructure for running agents, including their secrets, while Pipelines has a web application to handle user authentication, build orchestration
Buildkite
American basketball player (born 1984)
unrestricted free agent. He returned to the Cavaliers, signing a two-year, $42 million contract, and switched back to the No. 23 jersey. In contrast to his departure
LeBron_James
Monitoring and management of performance and availability of software applications
traffic from user request to data and back again is part of capturing the end-user experience (EUE). The outcome of this measuring is referred to as Real-time
Application performance management
Application_performance_management
Practice and strategies of increasing online visibility
content relevance, and authority signals to improve rankings for user queries. The objective of SEO is to attract users who are actively searching for information
Search_engine_optimization
Cryptographic network protocol
access to the remote system as the telnet user. Secure Shell mitigates this risk through the use of encryption mechanisms that are intended to hide the
Secure_Shell
Social network exclusively for AI agents
while human users are restricted to only viewing content. The platform initially lacked a mechanism to verify that a poster is an AI agent, but in February
Moltbook
Computer markup language
to conform to that of the SAML 2.0 specification. The message flow begins with a request directed at the IdP. The principal (via an HTTP user agent)
SAML_1.1
Chinese artificial intelligence company
The model can process both images and video, enabling agentic tasks such as replicating website user journeys from video demonstrations alone. The K2 model
Moonshot_AI
Backend in computing
cluster and parallel computing, a cluster manager is usually backend graphical user interface (GUI) or command-line interface (CLI) software that runs on a set
Cluster_manager
Telephone service involving internet forms for customer service
receive the Web callback request and a call center agent will call the person who made the request back on the number they entered. In some implementations
Web_callback
Interface between Web servers and external programs
interface specification that enables web servers to execute an external program to process HTTP or HTTPS user requests. Such programs are often written in
Common_Gateway_Interface
Malicious website exploit
ought to be considered "safe". This allows user agents to represent other methods, such as POST, PUT and DELETE, in a special way, so that the user is made
Cross-site_request_forgery
travel, tourism, insurance
BACK TO-BACK-USER-AGENT
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BACK TO-BACK-USER-AGENT
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BACK TO-BACK-USER-AGENT
travel, tourism, insurance