{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.call-forwarding","code":"thing-q240215","url":"https://ver.cy/models/thing/q240215/","name":"call forwarding","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Activities and processes","entryKind":"thing","plane":"ACT","domain":["ACT.ACT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"Call forwarding is a telephony service that redirects an incoming call addressed to one destination to another destination, either unconditionally or when a specified condition is met.","purpose":"Enable an agent to recognise call forwarding, assess when and where it redirects incoming calls, and determine which configuration or diagnostic actions are authorised.","scope":{"in":["The called identity, forwarding destination and party authorised to control forwarding","Unconditional and conditional forwarding rules and their activation state","Evaluation of forwarding conditions and selection of destinations","Forwarding chains, conflicts and termination conditions","Configuration changes and evidence of actual forwarding outcomes"],"out":["General telephone network transport and signalling implementation","Transfer of an already established call","General call distribution, queue management and simultaneous ringing","Voicemail recording, storage and retrieval","Number portability and permanent reassignment of telephone numbers","Provider-wide billing and account administration"],"boundaries":[]},"distinguishingFeatures":["An incoming call is addressed to an original called identity, while a forwarding rule directs it toward another destination.","Forwarding depends on a configured rule or service state; manually placing a new outgoing call does not constitute forwarding.","Unconditional forwarding does not depend on the original destination failing to answer; conditional forwarding requires a specified condition to be met.","Forwarding redirects an incoming call attempt rather than transferring an already established conversation.","Forwarding preserves the distinction between the original called identity and the destination; number reassignment changes which service the number identifies."],"structure":{"bundles":[{"id":"called-identity-and-destination","name":"Called identity and destination","description":"Establishes which incoming calls are subject to forwarding and where they are intended to go.","layers":[{"id":"original-call-addressing","name":"Original call addressing","description":"Locates the identity and service to which callers initially address calls.","findings":[{"id":"forwarding-subject","name":"Forwarding subject","description":"Record the original called address and the line, extension or service whose forwarding behaviour is being modelled.","questions":[{"text":"Which called address brings an incoming call within this forwarding configuration?","id":"forwarding-subject-q01","kind":"definition"},{"text":"Does the rule apply to this address alone or to other addresses associated with the same service?","id":"forwarding-subject-q02","kind":"boundary"}]}]},{"id":"destination-resolution","name":"Destination resolution","description":"Identifies the configured target and how its address is interpreted.","findings":[{"id":"resolved-forwarding-target","name":"Resolved forwarding target","description":"Record the destination as entered, its resolved address where available and whether it denotes an endpoint or another routing service.","questions":[{"text":"What destination is configured, and how does the forwarding service interpret its address?","id":"resolved-forwarding-target-q01","kind":"definition"},{"text":"What evidence confirms that this destination reaches the intended recipient or service?","id":"resolved-forwarding-target-q02","kind":"provenance"}]}]}]},{"id":"forwarding-conditions","name":"Forwarding conditions","description":"Captures the circumstances under which an incoming call should be redirected.","layers":[{"id":"condition-semantics","name":"Condition semantics","description":"Makes the meaning and evaluator of each forwarding condition explicit.","findings":[{"id":"trigger-interpretation","name":"Trigger interpretation","description":"Record whether forwarding is unconditional or conditional and the service-specific meaning of each condition.","questions":[{"text":"Which condition triggers forwarding, and what does the responsible service count as satisfying it?","id":"trigger-interpretation-q01","kind":"definition"},{"text":"Which component evaluates the condition, and where is that behaviour documented?","id":"trigger-interpretation-q02","kind":"provenance"}]}]},{"id":"timing-and-effective-state","name":"Timing and effective state","description":"Determines whether a rule is active and when a timed condition becomes eligible.","findings":[{"id":"rule-eligibility","name":"Rule eligibility","description":"Record enabled state, any supported activation window and the threshold and timing basis for no-answer forwarding.","questions":[{"text":"Is the rule currently enabled and applicable to the incoming call under examination?","id":"rule-eligibility-q01","kind":"measurement"},{"text":"For no-answer forwarding, what delay applies and which event starts that interval?","id":"rule-eligibility-q02","kind":"measurement"}]}]}]},{"id":"route-selection-and-chains","name":"Route selection and chains","description":"Explains the effective forwarding route when rules or downstream services interact.","layers":[{"id":"competing-call-treatment","name":"Competing call treatment","description":"Resolves interaction between forwarding rules and other incoming-call treatments.","findings":[{"id":"effective-rule-selection","name":"Effective rule selection","description":"Record the established ordering between applicable forwarding rules and adjacent treatments such as call waiting, rejection or voicemail routing.","questions":[{"text":"If unconditional and conditional rules are both configured, which one governs this call?","id":"effective-rule-selection-q01","kind":"boundary"},{"text":"How do other enabled call treatments affect whether the forwarding condition is reached?","id":"effective-rule-selection-q02","kind":"boundary"}]}]},{"id":"downstream-redirection","name":"Downstream redirection","description":"Tracks further forwarding and the conditions that stop the route.","findings":[{"id":"chain-and-termination","name":"Chain and termination","description":"Record known forwarding hops, repeated destinations, applicable limits and what happens when a downstream destination cannot accept the call.","questions":[{"text":"Does the destination forward again, and does the known route revisit an earlier address?","id":"chain-and-termination-q01","kind":"measurement"},{"text":"What documented behaviour terminates a loop, excessive chain or failed destination attempt?","id":"chain-and-termination-q02","kind":"provenance"}]}]}]},{"id":"forwarding-control-and-consequences","name":"Forwarding control and consequences","description":"Connects configuration authority with the recipient, information and cost consequences of redirecting calls.","layers":[{"id":"configuration-authority","name":"Configuration authority","description":"Establishes who may change the rule and through which control surface.","findings":[{"id":"authorised-rule-change","name":"Authorised rule change","description":"Record the controller's authority, supported configuration mechanism, requested change and recoverable prior state.","questions":[{"text":"What authority permits this agent to change forwarding for the original called identity?","id":"authorised-rule-change-q01","kind":"action"},{"text":"Which supported operation applies the requested change, and how can the prior configuration be restored?","id":"authorised-rule-change-q02","kind":"action"}]}]},{"id":"recipient-information-and-charges","name":"Recipient information and charges","description":"Identifies consequential differences between receiving a direct call and receiving a forwarded call.","findings":[{"id":"forwarded-call-consequences","name":"Forwarded call consequences","description":"Record supported evidence about identity presentation, forwarding indications, destination restrictions and applicable charge responsibility.","questions":[{"text":"What caller identity, original called identity or forwarding indication will the destination receive?","id":"forwarded-call-consequences-q01","kind":"provenance"},{"text":"Which destination restrictions and charge responsibilities apply to this forwarding route?","id":"forwarded-call-consequences-q02","kind":"provenance"}]}]}]},{"id":"forwarding-verification","name":"Forwarding verification","description":"Relates intended configuration to observed redirection and call completion.","layers":[{"id":"configuration-confirmation","name":"Configuration confirmation","description":"Checks whether a requested forwarding configuration became effective.","findings":[{"id":"effective-configuration-evidence","name":"Effective configuration evidence","description":"Record the requested state, service acknowledgement, subsequent readback and any unresolved difference between them.","questions":[{"text":"What does the service report as the current forwarding destination, condition and enabled state?","id":"effective-configuration-evidence-q01","kind":"measurement"},{"text":"What evidence distinguishes acceptance of the change request from activation of the requested behaviour?","id":"effective-configuration-evidence-q02","kind":"provenance"}]}]},{"id":"call-path-testing","name":"Call path testing","description":"Uses authorised call attempts to assess trigger handling and downstream outcomes.","findings":[{"id":"observed-forwarding-outcome","name":"Observed forwarding outcome","description":"Record test conditions, observed redirection, destination behaviour and limits on what the observation proves.","questions":[{"text":"Under controlled triggering and non-triggering conditions, did the call follow the expected route and timing?","id":"observed-forwarding-outcome-q01","kind":"measurement"},{"text":"Does the evidence establish redirection, destination ringing or an answered call, and which stages remain unobserved?","id":"observed-forwarding-outcome-q02","kind":"boundary"},{"text":"If the observed route differs from the intended route, which authorised diagnostic or restoration action should follow?","id":"observed-forwarding-outcome-q03","kind":"action"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of call forwarding this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-kinds","name":"Kinds and varieties","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these kinds and varieties hold for the sense of call forwarding this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of call forwarding this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-standards-and-regulation","name":"Standards and regulation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these standards and regulation hold for the sense of call forwarding this model covers, and on what evidence?","id":"evidence-standards-and-regulation-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of call forwarding this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of call forwarding this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of call forwarding this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-regional-variation","name":"Regional variation","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these regional variation hold for the sense of call forwarding this model covers, and on what evidence?","id":"evidence-regional-variation-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of call forwarding this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Set up or change call forwarding on lines the agent is authorized to manage, at the subscriber's request.","Explain forwarding options and their costs."],"mustNot":["Forward someone's calls to another number without the subscriber's knowledge and consent.","Use forwarding to intercept calls or one-time passcodes.","Forward emergency or care lines to unmonitored destinations.","Hide active forwarding from the line's subscriber."],"requiresHuman":["Changing forwarding on a shared, business or emergency line."]},"ethics":{"considerations":["Covert forwarding enables fraud and surveillance, including account takeover.","Missed forwarded calls can mean missed emergencies."],"affectedParties":["Subscribers","Callers","People relying on emergency lines"]},"owners":{"steward":"The subscriber of the line; the telephone service provider operates the service.","roles":[],"masterSystems":["Telephone service provider subscriber records"]},"relations":[{"target":"Q24895239","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.call-forwarding","Wikidata: Q240215 (https://www.wikidata.org/wiki/Q240215)"]},"properties":{"applicability":"not-applicable","items":["Original called identity: Telephone number, extension or other supported called address","Forwarding destination: Destination address and its associated service or endpoint, where known","Forwarding condition: Unconditional, busy, no answer, unreachable or an explicitly documented service-specific condition","Configuration state: Unconfigured, configured but disabled, enabled or unknown","No-answer delay: Seconds; not applicable or unknown where appropriate","Condition evaluation point: Named network service, PBX, application or endpoint responsible for evaluating the condition","Rule precedence: Documented ordering or override relationship among applicable rules","Forwarding hop count: Number of observed redirections, with observation coverage recorded","Observed call outcome: Redirected, destination ringing, answered, rejected, failed, timed out or unknown","Control authority: Authorised subscriber, administrator or delegated controller and applicable permission scope"]},"recognition":{"applicability":"not-applicable","items":[]},"capabilities":{"applicability":"required","items":["Inspect the effective forwarding configuration for a called identity.","Explain which forwarding rule applies to a specified incoming-call situation.","Enable, disable or change forwarding within the agent's granted authority.","Check destination validity, rule conflicts and potential routing loops before a change.","Run authorised test calls and compare observed routes with intended behaviour.","Restore a recorded prior configuration when an authorised change produces an unacceptable outcome."]},"hazards":{"applicability":"required","items":["Unauthorized forwarding can expose confidential conversations or divert calls intended to verify identity.","Incorrect destinations or forwarding loops can prevent callers from reaching the intended recipient.","Forwarded calls can incur unexpected charges under the applicable service tariff."]},"interfaces":{"applicability":"required","items":["Recommendation I.252.1, issued by the International Telecommunication Union Telecommunication Standardization Sector, specifies the call forwarding unconditional supplementary service.","Recommendation I.252.2, issued by the International Telecommunication Union Telecommunication Standardization Sector, specifies the call forwarding busy supplementary service.","Recommendation I.252.3, issued by the International Telecommunication Union Telecommunication Standardization Sector, specifies the call forwarding no reply supplementary service."]},"context":{"applicability":"required","items":["Call forwarding is used in personal and organizational telephone services to route incoming calls to an alternative destination.","It supports continuity when a person is unavailable, a line is busy or calls need to reach another location."]}},"sources":[{"title":"Wikidata item Q240215: call forwarding","url":"https://www.wikidata.org/wiki/Q240215","note":"identity and sense of the item"},{"title":"Wikipedia: Call forwarding","url":"https://en.wikipedia.org/wiki/Call_forwarding","note":"general description of the item"}],"openQuestions":["Which authoritative sources should establish the shared definition of call forwarding across carrier, PBX and application services, and where do their definitions diverge?","How do relevant implementations define busy and unreachable, particularly when call waiting, multiple registered devices or rejection features are active?","Which rule precedence, forwarding-chain limits and destination-failure behaviours are documented for the services represented by this registry entry?","Under which service and interconnection conditions are caller identity, original called identity and forwarding indications preserved or changed?","Which destination restrictions, charge responsibilities and configuration verification mechanisms vary enough to require explicit service-specific extensions?"],"resources":{"spec":"/models/things/publications/thing-q240215/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q240215/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T08:21:12Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"not-applicable","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:29+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane ACT: no invented physical properties.","interaction.recognition":"Call forwarding is a network behavior whose operation cannot be established from visual appearance."},"score":1.0}}