established · -1.3 market domain

Telephony

Score 24.8 / 100 85 providers +15 via APIs 33 APIs Search apis.io →
Business capabilities this tag reaches
Customer Service Management 2 Application Communications 1

Providers using this tag (85)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Exemplar 4 Complete, well-documented, and agent-ready
SignalWireCompanyCommunicationsCPaaSVoice2 APIs74.2Microsoft Azure Communication ServicesMicrosoft AzureCPaaSCallingChat22 APIs73.7CallNodeCompanyVoice AIPhone Numbers2 APIs69.5CloudTalkCompanyCommunicationsVoiceVoIP1 API68.6
Strong 32 Solid coverage with minor gaps
Neutrino APIData ValidationData ToolsCommunications2 APIs62.7SynthflowVoiceVoice AgentsNo-Code1 API59.3AgentLineArtificial IntelligenceVoiceSMS2 APIs56.3AgentPhoneCompanyPhone NumbersSMS1 API54.8BandwidthCommunicationsCPaaSVoiceMessaging3 APIs66.4GenesysCompanySoftwareContact CenterCustomer Experience1 API66.2SyllableCompanyArtificial IntelligenceAI AgentsVoice1 API66.1The Mobile First CompanyCompanyCommunicationsVoice1 API65.4AvayaCommunicationsContact CenterCollaborationArtificial Intelligence40 APIs64.6TalkdeskContact CenterCCaaSVoiceWebhook4 APIs64.1CallForMeCompanyAI AgentsVoicePhone Calls1 API64.0Phone ComCompanyVoIPBusiness Phone2 APIs63.0DialNexaVoice AIAI AgentsLead Qualification1 API62.8Numbers OnlinePhone IntelligenceCaller IDCNAMReverse Phone Lookup2 APIs61.5CleatCompanySMSPhone NumbersVerification Codes1 API60.8NextivaCompanyCommunicationsVoiceContact Center5 APIs59.4SonetelCompanyPhone NumbersVoIP20 APIs59.0SpekoVoiceVoice AISpeech-to-TextText-to-Speech1 API59.0Bright PatternCompanyContact CenterCCaaSCustomer Experience11 APIs58.9KixieCompanySales EngagementVoice3 APIs58.9Simple AIArtificial IntelligenceVoiceSoftware-as-a-Service1 API58.8GridspaceCompanyVoice AIConversational AIVoice Agents1 API58.7FamulorArtificial IntelligenceVoiceNo-Code1 API58.4CosVoiceCompanyAI AgentsVoice1 API58.3WeaveCompanyCommunicationsMessagingPayments1 API58.1PhonicCompanyArtificial IntelligenceVoice AIConversational AI1 API57.7SaperlyVoiceSMSPhone Numbers2 APIs57.5FixieCompanyVoice AIConversational AIReal-Time1 API56.9VeraDialAI ReceptionistBusiness PhoneVoice AI6 APIs56.2QuoCompanyCommunicationsMessagingSMS1 API55.5BolnaCompanyArtificial IntelligenceVoice AIConversational AI1 API55.1VOYGRCompanyLocation IntelligencePOIData Enrichment1 API54.4
Developing 22 Usable, with meaningful gaps to close
NetomiCompanyArtificial IntelligenceAI AgentsCustomer Experience1 API51.9Bitrix24CRMCollaborationProject ManagementTask1 API41.7CallRailCall TrackingConversation IntelligenceMarketing AttributionLead Tracking1 API54.1InvocaCompanyArtificial IntelligenceCall TrackingConversation Intelligence1 API53.7Chatley AICompanyArtificial IntelligenceVoice AgentsConversational AI2 APIs53.1VoiceGenieCompanyVoice AIConversational AISales Automation1 API52.8Sarj AI Developer APIVoice AIVoice AgentsConversational AIArabic AI4 APIs52.7OrumCompanyArtificial IntelligenceSalesSales Engagement50.3WazoVoIPUnified CommunicationsUCaaS25 APIs48.9HappyrobotAI AgentsAgent OrchestrationVoice AIConversational AI2 APIs47.9VoiceDockVoice AICommunicationsPlatform3 APIs47.4DialArtificial IntelligenceCommunicationsMessaging1 API47.3ThoughtlyVoice AIChat AIConversational AIAI Agents1 API46.7leadfriendly-comArtificial IntelligenceCRMVoiceSmall Business2 APIs46.4CallinglyCompanySalesLead ResponseSpeed To Lead3 APIs46.1ringahuman-comCompanyArtificial IntelligenceLead Generation2 APIs45.0ClutchCallCompanyVoice AIReal-Time CommunicationQUIC2 APIs44.1Cisco Voice PortalContact CenterIVRVoice4 APIs44.0confcallCompanyVideo ConferencingAI AgentsEmbeddable Widgets1 API42.8call4meArtificial IntelligenceAutomationSoftware-as-a-Service1 API41.2ClawdCallArtificial IntelligenceVoiceAutomationAgents1 API39.4BurnerCompanyPhone NumbersSMSMMS1 API39.3
Thin 11 Limited public surface area
RainbowCommunicationsCPaaSChatVoice3 APIs34.2TenfoldCompanyCTIContact Center1 API30.7sipgateCompanyCloudCommunications27.1TextForAgentsCompanyArtificial IntelligenceSMS1 API39.2JustCallVoiceSMSCloud PhoneContact Center1 API37.0PhonelyArtificial IntelligenceVoice AIVoice AgentsConversational AI2 APIs36.8DialMCPCompanyMCPAI AgentsPhone Calls1 API36.7answeringservicecare-comCall CenterVirtualAnsweringCustomer Service1 API30.6ConversoCompanyVoice AIAI AgentsConversational AI2 APIs28.7NewVoiceMediaCompanyCloudContact CenterCCaaS1 API27.6Samora AICompanyVoice AgentsConversational AIVoice AI1 API26.9
Emerging 10 Early or largely undocumented
AitocallArtificial IntelligenceVoiceCommunications1 API17.4Callab AIVoice AIConversational AIContact Center1 API14.8VocodeVoice AIVoice AgentsConversational AI1 API25.9BotPhoneArtificial IntelligenceReceptionistSoftware-as-a-Service1 API23.6BesideCompanySoftwareCommunicationsVoice19.0ChimelabsCompanyArtificial IntelligenceVoiceReceptionist19.0callagent.proAI AgentsVoicePhone Agents1 API18.8InternationalCall.coVoIPBrowserAppInternationalCalls1 API17.6aineedhelpfromotherai-comCompanyPhoneToolsCalculator1 API12.8FRITZ! (formerly AVM, FRITZ!Box)RouterMesh Wi‑FiSmart Home11.2
Minimal 6 Almost no public developer surface
Brooktrout TechnologyCompanyFaxVoice0.0DialupCompanyVoiceSocialCommunications10.6ParloaAgentsArtificial IntelligenceCall CenterCCaaS2 APIs10.4AnsweringPrices.comAnswering ServicePricingComparisonArtificial Intelligence8.5BinotelCompanyCloudBusiness4.8VonBoxCompanyCommunicationsMessaging3.9

APIs with this tag (33)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 6 Complete, well-documented, and agent-ready
Salesforce Service Cloud Voice APIThe Salesforce Service Cloud Voice API provides Telephony Integration REST API and Voice Toolkit API for pr...88.0Leadping Telephony APIProvides shared authentication and bootstrap data for Leadping telephony clients. Use this endpoint to obta...80.8SendPulse Telephony APIThe Telephony API from SendPulse — 4 operation(s) for telephony.72.3Service Cloud CTI APIOpen CTI — the JavaScript API that connects a telephony system's softphone to the Service Cloud console, pl...70.3Service Cloud Voice Telephony Integration APIREST API for integrating telephony systems with Service Cloud Voice, enabling programmatic management of vo...70.3Apollo.io Calls APIPhone-call records — log, search and update dialer activity. 3 operation(s) from the published Apollo OpenAPI.68.6
Strong 10 Solid coverage with minor gaps
Genesys Telephony APITelephony providers and configuration66.2Webex Telephony APIThe Telephony API from Webex — 1 operation(s) for telephony.66.1Neutrino API Telephony APIAPIs for live telephony62.7ServiceNow Openframe APIThe ServiceNow Openframe API provides REST endpoints that enable Contact Center as a Service (CCaaS) provid...61.9ServiceNow Voice Interaction Resource APIThe ServiceNow Voice Interaction Resource API provides REST endpoints for integrating telephony and voice s...61.9Swisscom Voice Mail APILegacy Voice API for listing and retrieving recent voicemail messages for a Swisscom MSISDN, secured by OAu...59.7Swisscom Voice VoIP APILegacy Voice API cluster for controlling a Swisscom VoIP subscriber — placing and listing calls, managing c...59.7Speko Telephony APIThe Telephony API from Speko — 22 operation(s) for telephony.59.0Bolna Voice AI APIREST API for building and operating conversational voice AI agents — create and manage agents, place outbou...55.1Voygr Calls APIProgrammatic outbound phone calls executed by an AI voice agent. Submit a task either as a plain-language b...54.4
Developing 7 Usable, with meaningful gaps to close
Wazo Phone Provisioning API (wazo-provd)Phone auto-provisioning service. Manages device plugins, configuration templates, device registrations, DHC...48.9Wazo Websocket Event Stream (wazo-websocketd)WebSocket gateway onto the Wazo internal event bus. An authenticated client subscribes to named platform ev...48.9ClutchCall Voice Control-Plane APIControl-plane API for the call lifecycle (originate, get, transfer, hangup), keyed off call_sid. Per the do...44.1iX Hello Customer v2 Outbound Calling APIPlaces outbound PSTN and SIP voice calls programmatically and runs an authored iX Hello flow on the call. T...42.4Bitrix24 REST APITenant-scoped REST API for managing CRM entities, deals, leads, tasks, calendars, telephony, disk files, us...41.7Bitrix24 Telephony APIThe Telephony API from Bitrix24 — 30 operation(s) for telephony.41.7Burner APIOAuth 2.0 REST API for programmatic access to Burner line management, messaging (SMS/MMS) and configuration...39.3
Thin 7 Limited public surface area
Heimster Telephony APIThe Telephony API from Heimster — 3 operation(s) for telephony.39.0JustCall REST APIREST API for placing calls, sending SMS and MMS messages, managing contacts, phone numbers, users, and call...37.0Phonely Agents APIManage Phonely voice agents programmatically. Retrieve a single agent or list all agents for a user, and up...36.8LiveKit SIP (Telephony) APISIP integration for inbound and outbound PSTN calls bridged into LiveKit rooms.34.3Webex Calling APICloud calling capabilities including call control, dial plans, voicemail, voice portals, queues, hunt group...29.7DealerSocket CTI & Activity Logging APIInbound call-tracking and activity-logging surface. CTI Direct Post logs inbound and outbound call informat...28.4Transports (WebRTC/WebSocket)Realtime media transport layer of the framework. Bidirectional audio, video, and data flow over Daily WebRT...28.0
Emerging 3 Early or largely undocumented
SystmOne Telephony APITPP's Telephony API for integrating telephony systems with SystmOne, supporting computer-telephony workflow...24.6callagent.pro Agent APIREST API for everything the callagent.pro dashboard does: agents, test-chat and test-call, numbers, SIP acc...18.8Callab AI APICallab AI's REST API, documented at docs.callab.ai/api-reference, is organized around REST principles with ...14.8

Companies reaching this through an API (15)

These companies publish an API, specification or operation carrying “Telephony” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Apollo.io Cisco Collaboration Hybrid Solutions Concentrix DealerSocket Heimster Leadping LiveKit Pipecat Salesforce Salesforce Service Cloud APIs SendPulse ServiceNow Swisscom TPP (SystmOne) Webex

Score breakdown

Frequency
53.0
log-scaled weighted occurrences
Breadth
1.1
spread across providers
Quality lift
44.9
mean composite of providers using it
Cohesion
15.4
strength of nearest seed neighbor

Related tags

Calls 28 co-occurrences Phone Numbers 22 co-occurrences Contact Center 29 co-occurrences Voice 51 co-occurrences Voice AI 22 co-occurrences Voice Agents 13 co-occurrences SMS 31 co-occurrences SIP 10 co-occurrences

Where this tag comes from

Provider tag85
Api tag33
Openapi tag5
Openapi op tag14

Cohort brief

Auto-generated

The 80 providers in the APIs.io catalog tagged Telephony, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
80
of 85 in the catalog
Mean Kin Score
46.2
+22.1 vs catalog 24.1
Mean Agent Readiness
34.2
+20.1 vs catalog 14.1
Spread
3.9–74.2
median 52.3 · σ 17.5
How the 80 split by band
Exemplar 4Strong 31Developing 21Thin 11Emerging 9Minimal 4
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Access Clarity 56.1 30 +26.1 80
Contract Quality 43.3 18.6 +24.7 80
Developer Ergonomics 48.6 24.5 +24.1 80
Operational Transparency 30.5 13.2 +17.3 80
Discoverability 70.9 59.1 +11.8 80
Contract Governance 20.5 9.7 +10.8 80

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 41% 18% +23
MCP server (first-party) 45% 16% +29
Agent Skills 0% 0% 0
OAuth scopes 30% 13% +17
Security 99% 99% 0
Arazzo workflows 1% 1% 0
Governance rules 74% 36% +38

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 SignalWire 74.2
  2. 2 Microsoft Azure Communication Services 73.7
  3. 3 CallNode 69.5
  4. 4 CloudTalk 68.6
  5. 5 Bandwidth 66.4
  6. 6 Genesys 66.2
  7. 7 Syllable 66.1
  8. 8 The Mobile First Company 65.4
  9. 9 Avaya 64.6
  10. 10 Talkdesk 64.1
Top by Agent Readiness
  1. 1 Sarj AI Developer API 65.6
  2. 2 Speko 61
  3. 3 DialNexa 60.5
  4. 4 AgentPhone 60.5
  5. 5 Synthflow 59.2
  6. 6 answeringservicecare-com 59.2
  7. 7 Phonic 57.9
  8. 8 CallNode 55.8
  9. 9 Saperly 55.8
  10. 10 Simple AI 55.6
All 85 members of this roster resolve to a provider in the catalog; 80 carry a score (94%). The figures above describe the scored members only.
Coverage caveat. 43 of 80 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 14 November 2026, across 41591 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

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Tools for tags

7 MCP tools reach this
  • find_tagsBrowse and filter every tag in the catalog.
  • get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
  • cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
  • cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
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