Telnyx Flow

FlowDesign and deploy powerful AI-assisted workflows using a low-code, drag-and-drop interface. Seamlessly integrate LLMs with our communications suite for enhanced productivity and efficiency.Start buildingContact salesHigh performance, low costRun LLMs and embeddings on Telnyx’s dedicated GPUs to achieve low-latency AI responses without middlemen markups or pass-through fees.Simple interface, complete controlDesign and deploy with an intuitive low-code interface offering the granular control needed for complex and sophisticated workflows.AI + CPaaSGet the best of both worlds. Combine the power of AI with Telnyx’s CPaaS suite to easily deploy voice and messaging assistants, streamlining customer interactions.Automatic uploading and embeddingPre-built content loaders instantly ingest and embed data for AI, ensuring your workflows stay updated with scheduled, automated refreshes.Training and fine-tuningLeverage existing interactions and datasets to fine-tune or train your models for better performance—no coding experience required.Choose any LLMAccess all leading open-source LLMs through a standardized SDK, with Telnyx managing the integrations to keep development effortless.BENEFITSPay less, build moreFlow runs on Telnyx’s dedicated infrastructure, eliminating 100% of middlemen fees and markups for the lowest latency and maximum cost-efficiency.0third party vendorsFull compatibility from the startTelnyx maintains compatibility and translations for function calling, JSON Mode, and more across all LLMs so your team doesn’t have to.1Standardized SDK and interfaceSupported modelsAccess the latest open-source LLMs on one platform. Easily switch between models for ultimate flexibility.20+ModelsThe latest and greatest, alwaysDesigned to readily import new LLMs, Telnyx integrates newly released models on the same day as release, ensuring you always have access to cutting-edge AI capabilities.Day 0Support for newly released LLMsHOW IT WORKSStart buildingSet up a Telnyx accountUnlock access to Telnyx Flow in minutes by signing up in the Mission Control Portal.Embed your contentUpload your files manually or use Telnyx loaders to automatically ingest and refresh content.Instantly build and testIncorporate your content and easily design custom workflows via the Flow interface.Deploy and scaleLeverage our distributed network for low-latency, high-performance applications with one-click deployment that scales.Step 1/4RESOURCEScURLCopycurl -X GET \ --header "Content-Type: application/json" \ --header "Authorization: Bearer YOUR_API_KEY" \ https://api.telnyx.com/v2/flow/execute/{workspace_id}/{workflow_id} Intelligent call workflowsEasily configure AI-powered call nodes to automate call handling with customizable workflows, delivering enhanced communication experiences.Start buildingHow we built FlowGet a behind-the-scenes look at the development of Telnyx Flow. Discover how this low-code platform empowers teams to easily create AI workflows.Learn moreMaster AI workflow automationLearn how to design and deploy powerful workflows with Telnyx Flow. Watch the webinar to unlock the potential of low-code AI integration.Watch webinarPricingOnly pay for what you useBuild powerful workflows with no upfront costs or subscriptions. With Telnyx Flow, you only pay for product usage—say goodbye to expensive infrastructure and SaaS fees.Get started for free$0No subscription feesSign upSOLUTIONSFutureproof your workflowsConversational AIPair global numbers, Telnyx Voice API, and Inference to connect intelligently with customers around the world.Learn moreChatbotsEffortlessly create and deploy chatbots using a simple interface and our powerful infrastructure for seamless integration.Learn MoreCall Control workflowsBuild tailored voice workflows with AI-powered call nodes to enhance communication efficiency.LEARN MOREInferenceEasily upload your data into buckets for instant summarization and automatic embedding.EXPLORE INFERENCEAI and machine learningBuild the AI model you need using low-latency, cost-effective object storage.Learn moreStorage for AIEasily embed stored data for fast, contextualized inference on one platform. Learn moreSign up and start buildingSign upContact salesFAQWhat is Telnyx Flow?Telnyx Flow is a low-code tool that enables users to design, develop, and manage automated processes or decision flows using a graphical user interface (GUI)with Telnyx products. Its intuitive design makes it accessible for users of all technical levels, empowering teams to streamline operations effortlessly.Telnyx Flow is a low-code tool that enables users to design, develop, and manage automated processes or decision flows using a graphical user interface (GUI)with Telnyx products. Its intuitive design makes it accessible for users of all technical levels, empowering teams to streamline operations effortlessly.What can I build with Telnyx Flow?How will Telnyx Flow help my business? What is a workspace in Telnyx Flow? What is a workflow or "flow"? What is the canvas in Telnyx Flow? How can a workflow be manually triggered? Can I use Telnyx Flow to manage call control workflows?Can I use Telnyx Flow to handle incoming customer support requests?How do I connect my chat interface with the workflow I created?Resources, Docs, SupportConversational AI | TelnyxMenu itemRead moreInference API Quickstart | TelnyxIntroductionRead moreGather using AI | TelnyxGather using AI is a powerful functionality that allows you to efficiently collect specific information from call participants. By leveraging AI, this feature can gather details such as names, addresses, or other relevant information based on a list you provided. The collected data is then sent back in a structured format. This new AI-driven feature offers a much easier user experience compared to the previous gather functionality, simplifying the process and reducing the time needed to collect information. This guide will walk you through the process of using the 'Gather Using AI' feature effectively.Read moreAI Playground Quickstart | TelnyxTutorial for AI Playground Quickstart. Start building on Telnyx today.Read moreVoice Assistant Quickstart | TelnyxIn this tutorial, you'll learn how to configure a voice assistant with Telnyx. You won't have to write a single line of code or create an account with anyone besides Telnyx. You'll be able to talk to your assistant over the phone in under five minutes.Read moreInference APIs | TelnyxIncorporate AI into your applications with ease.Read moreCreate an assistant API | TelnyxCreate a new AI Assistant.Read moreStart AI Assistant API | TelnyxStart an AI assistant on the call.Read moreGather using AI API | TelnyxGather parameters defined in the request payload using a voice assistant.Read moreGet available models API | TelnyxThis endpoint returns a list of Open Source and OpenAI models that are available for use.Read moreHow to optimize voice AI applications with fine-tuningLearn best practices and actionable strategies for fine-tuning voice AI applications to enhance real-time processing, accuracy, and user satisfaction.Read moreHow AI-powered voice tools elevate customer conversationsLearn how voice AI is changing customer communication, improving efficiency, and reducing costs.Read moreTelnyx Blog | CPaas & UCaaS ResourcesFind data-driven research, comprehensive guides and all things SIP trunking, voice and SMS APIs, wireless and more.Read moreWhy low-latency is essential for real-time voice AILearn how every millisecond impacts voice AI. Explore how Telnyx’s full-stack approach delivers ultra-low latency and smoother voice interactions.Read moreVoice AI Agents—Quickly build and launch | Ultra-low latencyBuild and launch powerful Voice AI Agents faster and cheaper with Telnyx. Ultra-low latency, unmatched call quality, total control.Read moreBuild a no-code AI Assistant with TelnyxLaunch a no-code AI Assistant with Telnyx to streamline your AI development.Read moreHow to build a low-latency voice assistant: Expert insightsLearn how Telnyx engineers tackled latency challenges to build a voice assistant with under-1s response time. Explore solutions in our webinar recording.Read moreYour complete conversational AI toolbox | TelnyxExplore the key components for building conversational AI, and learn how Telnyx can provide the basic and advanced features you need.Read moreVoice analytics tools: building blocks for telephony and AILearn how Telnyx supports conversational AI and voice analytics with plug-and-play APIs to control a global, real-time telephony & communications network.Read moreBuild on the Telnyx AI Platform to create next-gen appsExplore how the Telnyx AI Platform can elevate your next-gen applications with ease, speed, and flexibility. Discover what sets Telnyx apart.Read moreVapi alternative: Best platform for scalable Voice AISee why Telnyx is the best Vapi alternative. Get low-latency, scalable Voice AI with direct network access and flexible dev tools.Read moreThe better Vonage Voice API alternative - TelnyxSwitch to Telnyx for a better Vonage voice alternative. Benefit from our global coverage, excellent support, and flexible APIs..Read moreVoice API Essentials | Telnyx Help CenterIn this collection you will find helpful links that explain the mission control portal features and troubleshooting tips.Read moreInbound/Outbound Voice | Telnyx Help CenterInbound/Outbound Voice configuration guideline materials. Start building on Telnyx today.Read moreGeneral Voice API Help | Telnyx Help CenterGet assistance with Telnyx's Voice API: UK TPS, Google Verified Calls, STIR/SHAKEN.Read moreGetting Started with Telnyx Flow | Telnyx Help CenterFlow empowers users across various teams to build and manage sophisticated AI Assistants and automated workflows.Read moreTelnyx Flow | Telnyx Help CenterYour one stop shop and user interface for controlling your Telnyx workflowsRead moreReal-Time Transcription | Telnyx Help CenterEnable real-time transcription for calls with Telnyx. Enhance user experience now.Read moreConversational AI [Integration] Use CasesBoost engagement and efficiency through Telnyx's Conversational AI. Start integrating now.Read moreAI and Machine Learning [Use Cases]See how AI and machine learning can enhance your projects. Explore Telnyx use cases today.Read moreBy clicking “Accept All Cookies”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts.Read more Accept allCookies settings --- PricingFlexible, transparent pricing with discounts as you scale.Pay as you goPay only for what you use, when you use it.Top up your account through your Mission Control Portal.Receive automatic discounts as you scale your calling and messaging volumes.Access free in-house support 24/7 via chat or call.Volume-based pricingDo more; pay less.Work with a dedicated sales representative to set discounted pricing based on your monthly usage.Receive specialized support from a personally allotted customer success manager.Receive prioritized ticketing privileges and NOC support.Free in-house supportTalk to a telecommunications specialist via chat or call, 24/7/365.Portal accessSet up, manage and monitor your telecommunications easily through your Mission Control Portal.Automatic discountsAs your traffic hits higher volume thresholds, we apply discounts automatically.CommunicationsMessagingMessaging APIVoiceSIP TrunkingVoice APIConversational AISpeech-to-textText-to-speechNumbersGlobal NumbersVideoVideo APIIdentityNumber Lookup APIVerify APIFaxFax API IoTIoT SIM CardMobile VoiceMobile VoiceNetworkingProgrammable NetworkingGlobal Edge RouterComputeCloud StorageInferenceBy clicking “Accept All Cookies”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts.Read more Accept allCookies settings --- Product page ErrorThere was an error loading the product sectionsRetry LoadingBy clicking “Accept All Cookies”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts.Read more Accept allCookies settings --- Build Voice Experiences with AI-ready Voice APIDeploy seamless communication experiences with developer-friendly APIs, transparent pricing, and scalable infrastructure built for global voice applications.Talk to an expertSign upWHY TELNYX?Why leading companies choose Telynx Voice APIWhether you're adding voice to your product, launching a contact center, or building a voice AI agent, Telnyx gives you the control and performance to move fast globally with low-cost pricing. Use our flexible Voice APIs to power customer calling, recording and real-time call flows.Global reach Full programmatic control over PSTN voice services in 140+ countries. As a licensed carrier, we deliver secure, compliant, and reliable infrastructure. So you can, scale your voice application as you grow with confidence.Ultra-low latencyVoice traffic stays on a private backbone with AI and telephony infrastructure co-located for faster response times. With PoPs in 9 regions, round trip time stays under 150 ms so your IVRs and AI voice agents feel instant for every caller.Cost-effective pricingUsage-based pricing with no hidden fees, no third-party markups, and no upfront investment in infrastructure. You get predictable billing that scales with your needs. 50%+ cost savings when switching from other CPaaS providers.Features Powerful Voice API features Telnyx Voice API gives developers everything they need to build scalable, reliable and programmable voice infrastructure, including AI powered call flows. Real-time media streamingSpeech-to-textText-to-speechConversational AI commandsCall controlBrowser/App CallingStream bi-directional RTP audio over secure WebSockets. Ideal for voice-AI assistants and real-time coaching platforms that analyse speech on the fly and deliver instant, context-aware feedback.Explore all featuresConvert voice to text in real-time with low-latency, high accuracy engines from Telnyx or Google and automatic speaker separation for clear multi-party transcripts.Explore all featuresPlay dynamic, natural-sounding voices in 40+ languages and accents using synthesized speech.Explore all featuresAdd voice agents to any call in minutes by chaining TTS, STT, and LLM logic via simple AI Gather and AI Assistant commands.Explore all featuresTake full control of every leg of a call with one-line API commands. Route callers, move them between endpoints, or cleanly end sessions in real time.Explore all featuresEasily integrate calling into your web and mobile applications with the power of WebRTC. Our Voice SDKs are available for web, iOS, and Android.Explore all features140+countries supported25M+API requests daily10M+ call minutes per dayVOICE API FOR DEVELOPERSBuild smarter voice applications with flexible APIsWith Telnyx’s REST APIs, you can effortlessly create dynamic call flows and integrate AI into the mix without telephony expertise.Your team can go from prototype to production easily with detailed developer documents and 24/7 free support. Go to market fast, scale rapidly, and keep your focus entirely on innovation.Explore Dev DocsMake a phone callCopycurl -i -X POST "https://api.telnyx.com/v2/calls" \ -H "Content-Type: application/json" \ -H "Authorization: Bearer YOUR_TELNYX_API_KEY" \ -d '{ "connection_id": "YOUR_CONNECTION_ID", "to": "+15551234567", "from": "+15557654321", "webhook_url": "https://your-webhook.url/events" }' Start streamingCopycurl -L 'https://api.telnyx.com/v2/calls/CALL_CONTROL_ID/actions/streaming_start' \ -H 'Content-Type: application/json' \ -H 'Accept: application/json' \ -H 'Authorization: Bearer ' \ -d '{ "stream_url": "wss://www.example.com/websocket", "command_id": "891510ac-f3e4-11e8-af5b-de00688a4901", }' AI conversation startCopycurl -L 'https://api.telnyx.com/v2/calls/CALL_CONTROL_ID/actions/ai_assistant_start' \ -H 'Content-Type: application/json' \ -H 'Accept: application/json' \ -H 'Authorization: Bearer ' \ -d '{ "assistant": { "id": "string", "openai_api_key_ref": "string", "instructions": "You are a friendly voice assistant." }, "voice": "Telnyx.NaturalHD.Estelle" }, "greeting": "Hello, can you tell me your age and where you live?", "interruption_settings": { "enable": true }, "transcription": { "model": "distil-whisper/distil-large-v2" }, }' Record a callCopycurl -L 'https://api.telnyx.com/v2/calls/CALL_CONTROL_ID/actions/record_start' \ -H 'Content-Type: application/json' \ -H 'Accept: application/json' \ -H 'Authorization: Bearer ' \ -d '{ "format": "wav", "channels": "single" }' Make a phone callStart streamingAI conversation startRecord a callPRICINGSee our Voice API pricingCustomers can save up to 50% by switching to Telnyx with lower per-minute rates, automatic volume discounts, and no hidden fees.Starting at $0.002per minuteSee pricingUse casesBuild smarter apps with programmable voiceCloud IVR Build a flexible, scalable IVR to reduce wait times and deliver a better customer experience.Learn more Contact Center AIBuild intelligent, real-time call flows with integrated speech, routing, and analytics on a global voice network.Learn more Call tracking Track and optimize campaigns using global voice and SMS with support for compliant attribution and dynamic number insertion.Learn more Conferencing callingEmpower your employees to join a call from almost anywhere—even if they’re not online.Learn moreSign up and start building.Sign upTalk to an expertFAQWhat is a Voice API?A Voice API is a tool that developers use to make and receive phone calls using an Application Programming Interface (API). A Voice API connects internet-based applications to the Public Switched Telephone Network (PSTN).A Voice API is a tool that developers use to make and receive phone calls using an Application Programming Interface (API). A Voice API connects internet-based applications to the Public Switched Telephone Network (PSTN).How do I build with the Telnyx Voice API?Can I record calls with a Voice API?Does Telnyx offer text-to-speech capabilities?How much does the Telnyx Voice API cost?Can I use XML code with the Telnyx Voice API?What use cases does the Telnyx Voice API support?How can I use AI with Telnyx Voice API?Resources, Docs, SupportTelnyx Voice Product Suites Overview | TelnyxTelnyx Voice Product Suites OverviewRead moreTelnyx Programmable Voice | TelnyxTelnyx's Developer Portal is your one-stop shop for all things Programmable Voice. From here you can learn how to get started, explore our API reference, and find code samples and other resources.Read moreFundamentals | TelnyxOverviewRead moreVoice API Commands and Resources | TelnyxThe following endpoints can be used with the Voice API applications.Read moreWebhooks | TelnyxOverviewRead moreVoice APIs | TelnyxOur Voice products make it possible for you to programmatically manage calls, manage outbound voice traffic, and send/receive faxes.Read moreList call control applications API | TelnyxReturn a list of call control applications.Read moreRetrieve a phone number with voice settings API | TelnyxRetrieve a phone number with voice settingsRead moreList connections API | TelnyxReturns a list of your connections irrespective of type.Read moreDial API | TelnyxDial a number or SIP URI from a given connection. A successful response will include a call_leg_id which can be used to correlate the command with subsequent webhooks.Read moreWhat is Voice API? Programmable Voice ExplainedWhat is a voice API? Our comprehensive guide to programmable voice for developers breaks down cost, use cases, and incredible voice API features.Read moreCall Control : Telnyx Launches New Programmable Voice APIThe Telnyx voice API allows customers to connect and control calls programmatically, all over the globe.Read moreTelnyx Voice API vs. TeXML: What’s the difference?You can use either Telnyx Voice API or TeXML to build advanced voice capabilities into your applications. Learn which tool is right for your project.Read moreCustomer spotlight: Using Telnyx Voice API with OpenAIA developer in Turkey leveraged Telnyx and OpenAI to call thousands of pharmacies to find medication during a shortage.Read moreChatGPT Voice API vs. Telnyx: Best voice API for businessCompare ChatGPT Voice API and Telnyx Voice API to find the best option for business communications. Explore features, pricing, and real-time AI capabilities.Read moreTelnyx vs Twilio: Voice API comparison for 2025Telnyx vs Twilio: See which voice API gives you lower latency, better pricing, and full-stack control for global communications.Read moreFoundational tools for building future-ready voice solutionsLearn what your organization needs to build innovative voice solutions that will meet the demands of modern businesses and consumers.Read more[Video walkthrough] Getting started with Telnyx Voice APIJoin VP of Business Development Mclain Roth as he walks through the setup steps to get started using Telnyx Voice API (Call Control).Read moreHow AI-powered voice tools elevate customer conversationsLearn how voice AI is changing customer communication, improving efficiency, and reducing costs.Read moreVoice AI Agents—Quickly build and launch | Ultra-low latencyBuild and launch powerful Voice AI Agents faster and cheaper with Telnyx. Ultra-low latency, unmatched call quality, total control.Read moreThe Better Twilio Alternative - TelnyxSwitch to Telnyx for a better Twilio alternative. Benefit from our competitive pricing, private global network, and award-winning support.Read moreThe better Vonage Voice API alternative - TelnyxSwitch to Telnyx for a better Vonage voice alternative. Benefit from our global coverage, excellent support, and flexible APIs..Read moreVoice API Essentials | Telnyx Help CenterIn this collection you will find helpful links that explain the mission control portal features and troubleshooting tips.Read moreGeneral Voice API Help | Telnyx Help CenterGet assistance with Telnyx's Voice API: UK TPS, Google Verified Calls, STIR/SHAKEN.Read moreConfiguring Call Control/TeXML Applications - Voice API | Telnyx Help CenterThis article describes the in-depth setup of Call Control / TeXML Applications on our Mission Control Portal.Read moreTeXML and Telnyx Voice API compatibility | Telnyx Help CenterAvoid combining TeXML and Call Control commands in the same applicationRead moreTelnyx Tech Specs | Telnyx Help CenterHere you will find out key tech specs at Telnyx and what they mean for our service.Read moreAPI Keys and How to Use Them | Telnyx Help CenterIn this article we will explain API keys and how to use them with both API v2 and API v1.Read moreStreamline Call Control workflows with Telnyx FlowCreate highly customizable Call Control workflows with Telnyx Flow. Automate call handling for efficient, reliable voice communication.Read moreCreate Custom Call Flows with TelnyxBuild custom call flows that connect you to the right customers at the right time with Telnyx Voice API. Start building call flows today.Read moreBy clicking “Accept All Cookies”, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts.Read more Accept allCookies settings