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Click any page in the sidebar to view it, or copy the full llms.txt for your AI tools. www.twilio.com/llms.txt [Raw llms.txt](https://www.twilio.com/docs/llms.txt) [Raw llms-full.txt](https://www.twilio.com/llms-full.txt) Copy Markdown [](https://www.twilio.com/llms.txt) llms.txt Authy: 2FA and Passwordless Login Authy: 2FA and Passwordless Login Building with AI Building with AI Twilio Skills for AI coding agents Twilio MCP server Conversation Intelligence (classic) Pre-built Language Operators Conversation Intelligence (classic) onboarding guide Language Operators Conversation Intelligence (classic) Generative Custom Operators Customize Your Conversation Intelligence (classic) Configuration Conversation Relay integration for AI agent observability AI Nutrition Fact Labels Conversation Intelligence (classic) - Transcript Sentence Subresource Conversation Intelligence (classic) - Transcript Resource Conversation Intelligence (classic) - Service Resource Conversation Intelligence (classic) API Overview Elastic SIP Trunking Protect your account with Voice Dialing Geographic Permissions Test your Elastic SIP Trunk Troubleshooting your Trunk Elastic SIP Trunking — Solution Blueprints SIP Header Manipulation Twilio SIP Trunking Scale and Limits IP Addresses for Elastic SIP Trunking Services Elastic SIP Trunking Extended Call Duration Emergency Calling for SIP Trunking Calls per Second (CPS) — Trunking Termination Configure your Trunk using Twilio Interconnect Elastic SIP Trunking Codecs Call Transfer via SIP REFER Elastic SIP Trunking Configuration Guides Trunk Resource PhoneNumber Resource Elastic SIP Trunking REST API Reference Emergency Calling for SIP Trunking API Event Streams Event Streams Flex Flex How we release Flex Get Started with Flex Conversations Checklist for setting up Twilio Flex Twilio Flex Quickstart: Getting Started with Flex Plugin Development Flex Mobile (public beta) Warm transfer User Guide to Troubleshooting the Flex UI Advanced Team view filters Service Level Preferences Pre-Release Features - End User Guide Use Chat and Messaging Keyboard Shortcuts Initial Audio Device Check Use Flex on a mobile device (public beta) Use the Flex Dialpad Debugger Integration with Flex Chat Attachments Change your language (Public Beta) Unified Profiles Container (Public Beta) Getting Started with TaskRouter Flex developer documentation Agent Copilot: wrap-up notes webhook (public beta) AI overview (Public Beta) What is Twilio Flex? 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Fraud & Abuse Response Guide Example: RCA Summary Request Form Engage: Contact Twilio Support Diagnose: Root Cause Analysis (RCA) Contain: Immediate Countermeasures Analyze: Investigate Job Resource Bulk Export API overview ExportConfiguration resource Export Custom Job Resource Day Resource Billing Billing Groups REST API: UsageTrigger REST API: Usage Records Twilio API overview REST API: Applications REST API: Addresses ISO/IEC Certification Security How to use ngrok with Windows and Visual Studio to test webhooks Get started with your Twilio free trial account Set up your Python and Flask development environment Set up your PHP development environment Set up your Node.js and Express development environment Set up a your Java development environment Set up your C# and ASP.NET MVC development environment Secure your Flask App by Validating Incoming Twilio Requests Secure your Express app by validating incoming Twilio requests Secure your C# / ASP.NET Core app by validating incoming Twilio requests Secure your C# / ASP.NET app by validating incoming Twilio requests How To Make REST API Requests in PowerShell A Beginner's Guide to the Command Line Global Infrastructure Using the Twilio REST API in a non-US Region Use the Programmable Voice JavaScript SDK with a non-US Twilio Region Twilio Regions Understanding Edge Locations SMS Data Residency in EU Regional SIP Trunks Regional SIP Domains Regional product availability Migrating your application to a new Region Messaging features in Ireland (IE1) Use the Programmable Messaging API with Twilio Regions Managing Regional Resources in Console Global Infrastructure Set a phone number's inbound processing Region using the Console Set a phone number's inbound processing Region using the REST API Inbound Call Processing Make an outbound phone call using REST API in a non-US Twilio Region Legacy Edge Location IDs Edge Locations Media Streams Configuration Firewall Configurations Termination SIP URIs Twilio Programmable Voice SIP Domains Regional Migration Best Practices General Twilio Voice Regional Migration Best Practices Twilio Elastic SIP Truking Regional Migration Best Practices Glossary What is Voice Trace? 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What is a Webhook? What is an SMS Gateway? What is a String Identifier (SID)? What's an SMS Short Code? What is a Call Center? What is E.164? What is Direct Inward Dialing (DID)? What are WebSockets? What are SMS Notifications? What are Masked Phone Numbers? Alphanumeric Sender ID Application-to-Person Messaging Web API Urchin Tracking Module (UTM) parameters Unsubscribe Unknown User Undelivered Email Two Factor Authentication (2FA) Trusted sender Triggered email Triggered action Transactional email What is a Time-based One-time Password (TOTP)? 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Bulk email service Bounced email messages Blocked email messages Blocklist Bayesian filter Autoresponder Automated email Allowlist Affirmative consent Affiliate marketing Ad unit Ad impression Ad exchange Identity and Access Management (IAM) Test Credentials Identity and Access Management (IAM) Credentials PublicKey Resource Access Tokens Static Proxy for Webhooks Twilio Editions HIPAA Accounts Single Sign On Configuring SSO with any other SAML2.0 Identity Provider Configuring Okta with Twilio SSO Configuring Azure Active Directory with Twilio SSO Okta SCIM integration Microsoft Entra ID SCIM integration SCIM API reference Public Key Client Validation Quickstart Get Started with Public Key Client Validation Managed users Managed accounts Organizations Domains OAuth apps Organization OAuth apps OAuth Token API OAuth apps FAQs Account-level OAuth apps REST API: Credentials REST API: Connect Apps Twilio Connect REST API: Authorized Connect Apps Restricted API keys Create API keys in Twilio Console REST API: Key Resource v2010 REST API: Key Resource v1 API keys overview REST API: Secondary Auth Token Our API: the basics REST API: Auth Token REST API: Accounts Types of Roles Role API reference Role Assignment API reference RBAC in Twilio Console RBAC in Legacy Console Access Control Twilio Connect Python Quickstart Twilio Connect Java Quickstart REST API: Subaccounts Interconnect Interconnect Lookup Using Lookup with Twilio Regions Lookup v2 Quickstart Lookup SIM Swap Overview Lookup Lookup v1 Tutorial: Validation and Formatting Lookup v1 API Lookup v1 Tutorial: Carrier and Caller Name SMS Pumping Risk Score SIM Swap Reassigned Number Line Type Intelligence Line Status Lookup v2 API Identity Match Formatting and Validation Caller Name Call Forwarding Marketplace Marketplace Network Traversal Service STUN-TURN IP Addresses & Ports Network Traversal Service Frequently Asked Questions REST API: Network Traversal Service Tokens OpenAPI OpenAPI Phone Numbers Pricing: Phone Numbers Resource Phone Numbers Best practices for phone number use Reading Regulations for the UK Bundle Letter of Authorization (LOA) Template Phone Number Regulatory FAQ Hosted Number Orders - API Quickstart Hosted Numbers FAQ Global Phone Numbers Catalog Phone Numbers IncomingPhoneNumber resource AvailablePhoneNumber Local resource AvailablePhoneNumber TollFree resource AvailablePhoneNumber resource AvailablePhoneNumber Mobile resource How to Find a BU SID or an AD SID Getting Started: Regulatory Compliance Public REST APIs Console: Getting Started with Phone Number Regulatory Compliance Regulatory Compliance REST APIs Bundles Resource Hosted Number Order Resource REST API: Available Numbers Programmable Chat Programmable Chat Programmable Messaging Programmable Messaging TwiML™ Message: TwiML™ for Programmable Messaging Messaging Services Alphanumeric Sender IDs in Messaging Services No-code SMS quickstart with Twilio Studio SMS developer quickstart Get started with Messaging Services Test your SMS Application Customize users' opt-in and opt-out experience with Advanced Opt-Out Programmable Messaging Onboarding Twilio's request to your incoming message Webhook URL Track the Message Status of Outbound Messages What to know before sending international SMS messages Message Redaction for Programmable Messaging Outbound Message Status in Status Callbacks Best Practices for Messaging Delivery Status Logging Test SMS messaging with the Virtual Phone Debugging Common Issues with SMS Best Practices for Scaling with Messaging Services Accepted content types for media Traffic Optimization Engine SMS Pumping Protection for Programmable Messaging Programmable Messaging Logs Message Scheduling Intelligent Alerts for Twilio Messaging Services resource Pricing: Messaging Countries resource Services PhoneNumbers subresource Messages resource Feedback subresource Media subresource Messaging API Overview Twilio Messaging Channels Get started with Facebook Messenger (public beta) Send SMS and MMS messages Receive and Reply to Incoming Messages - Python Receive and Reply to Incoming Messages - Node.js Receive and Reply to Incoming Messages Receive and Reply to Incoming Messages - C# Media subresource Receive and Download Images on Incoming Media Messages with Python and Django Receive and Download Images on Incoming Media Messages with PHP and Laravel Receive and Download Images on Incoming Media Messages with Node.js Receive and Download Images on Incoming Media Messages with Java Receive and Download Images on Incoming Media Messages Receive and Download Images on Incoming Media Messages with C# Transition from a Sole Proprietor to a Standard Brand A2P 10DLC registration application quickstart ISV A2P 10DLC Onboarding Overview A2P 10DLC - Standard and Low-Volume Standard Brand Onboarding Guide for ISVs New Sole Proprietor A2P 10DLC Registration for ISVs: API Walkthrough A2P 10DLC - Registration for Government and Nonprofit Agencies Create Mock US A2P 10DLC Brands and Campaigns Programmable Messaging and A2P 10DLC A2P 10DLC - Use Externally Registered Campaigns Set Up A2P 10DLC Event Streams Direct Standard and Low-Volume Standard Registration Guide A2P 10DLC - Gather the Required Business Information Toll-free verification console onboarding guide Get started with toll-free verification using the API SMS Pumping Protection Insights Messaging Insights Dashboards Link Shortening Onboarding Guide Link Shortening Troubleshooting Sole Proprietor Brand Registration Failures Troubleshooting A2P 10DLC Standard/LVS Brands Troubleshooting and rectifying Campaigns Troubleshooting A2P Phone Number registration issues Troubleshooting A2P 10DLC Registrations Programmable Voice Troubleshooting voice calls Pricing: Voice Resource Interactive Voice Response Programmable Voice How to share information between your applications Voice Conference Brand your calls using CNAM Answering Machine Detection Answering Machine Detection FAQ & Best Practices Voice Insights Voice Insights Advanced Features Virtual Agent Dialogflow CX onboarding guide TwiML™ Voice: TwiML™ Voice: TwiML™ Voice: TwiML™ Voice: TwiML™ Voice: TwiML™ Voice: TwiML™ Voice: TwiML™ Voice: TwiML™ Voice: TwiML™ Voice: TwiML™ for Programmable Voice TwiML™ Voice: TwiML™ Voice: TwiML™ Voice: TwiML Voice: TwiML™ Voice: How to route calls to your SIP network with an outbound call Respond to Incoming Phone Calls Record Phone Calls Modify Calls In Progress Make outbound phone calls Gather User Input with Keypad Create conference calls How to capture your first payment using Consume a real-time Media Stream using WebSockets, Python, and Flask Trusted calling with SHAKEN/STIR Increase Call Answer Rates with Voice Integrity SIP Quickstart SIP No-code Voice quickstart with Twilio Studio Media Streams - WebSocket Messages Media Streams Overview Track usage, costs, and application health for Twilio Programmable Voice Bring Your Own Carrier (BYOC) Trunking for Programmable Voice Branded Calling overview Verifying Caller IDs at Scale Streams subresource SIP registration Making SIP Calls Use SIP with Twilio Voice Inbound - Sending SIP to Twilio Recordings resource Outbound - Receiving SIP from Twilio Calls Transcriptions subresource OutgoingCallerIds resource Programmable Voice API Overview Conferences resource Conferences Participants subresource Call resource Events subresource Voice SDKs Network Connectivity Requirements Voice SDKs Voice SDK Error Codes Voice Insights Event Streams TwiML™️ Voice: Text-to-Speech (TTS) TwiML™ Voice: Pay Connectors TwiML™ Voice: TwiML™ Voice: TwiML™ Voice: Retrieve Call Logs Emergency Calling for Programmable Voice IVR: Phone Tree with Python and Flask Build an Interactive Voice Response (IVR) Phone Tree Transcriptions resource Voice React Native SDK Voice iOS SDK Getting Started with the Voice iOS SDK Voice JavaScript SDK: Twilio.Call Voice JavaScript SDK: Twilio in the browser Voice JavaScript SDK quickstart Voice JavaScript SDK: Changelog Voice JavaScript SDK: Best Practices Voice Android SDK Getting Started with the Voice Android SDK Details: Voice Insights SDK Events Details: Conversation Relay Insights Events Generic Pay Connector TwiML™ Voice: Voice JavaScript SDK: Twilio.Device Twilio.Device.audio Proxy: One-to-one Masked Communications Using the Reserved Numbers and Auto-Create functionalities to support the "online directory" scenarios Phone Number Management Reserved Phone Numbers Proxy Quickstart Proxy Limits Proxy Changelog How many Phone Numbers do I need? Out-of-Session Callback Response Guide Opt-out keywords Moving to Proxy Beta from Developer Preview Proxy: One-to-one Masked Communications Using Proxy with Flex A2P SMS Using Proxy with Channels Webhooks Session Resource Service Sending Messages Phone Number Participant Interaction The Proxy API Overview RCS Business Messaging Send and receive RCS messages Programmable Messaging RCS Regional Availability Get started with branded RCS messaging RCS Business Messaging SDKs SDKs SMPP API SMPP API Serverless Quickstart Studio Subflows Studio Studio Troubleshooting Studio FAQ Liquid Template Language Studio User Guide Get Started with Twilio Studio Using Twilio Conversations with Studio Use RCS messaging with Studio Tutorials Set up an SMS Autoresponder with Twilio Studio Send Appointment Reminders with Twilio Studio Post Messages to Slack with Twilio Studio Forward Calls with Twilio Studio Conduct an SMS Survey with Twilio Studio How to build an IVR with Twilio Studio Build a Chatbot with Twilio Studio Customer Support Menu with WhatsApp and Twilio Studio REST API v1 Flow Execution Resource TwiML Redirect widget Trigger (Start) widget Split Based On... widget Set Variables widget Send and Wait For Reply widget Send Message widget Send to Flex widget Say/Play widget Run Function widget Record Voicemail widget Make Outgoing Call widget Widget Library Make HTTP Request widget Gather Input On Call widget Enqueue Call widget Connect Virtual Agent widget Connect Call To widget Call Recording widget Test User Step REST API v2 Flow Execution Execution Context Sync: Shared state in the cloud Sync: Shared state in the cloud TaskRouter: Skills-based routing for contact centers Skipping based on Worker availability Queueing Twilio calls with TaskRouter Time of Day Routing for TaskRouter Lifecycle of a Task: Timeout evaluation Queue Ordering Ordering Workers Multitasking Upgrade to TaskRouter SDK version 2 Lifecycle of a Task: Workflows and Assignment Lifecycle of a Task: Task state TaskRouter.js v2 and v3: Integrating TaskRouter with your browser-based applications TaskRouter: Skills-based routing for contact centers How TaskRouter Works Assigning Tasks to Workers: Handling Assignment Callbacks Using TaskRouter Expressions Known Agent Routing Workflows Overview Dynamic Call Center with Ruby and Rails Dynamic call center with Python and Django Dynamic Call Center with PHP and Laravel Dynamic Call Center with Node.js and Express Dynamic Call Center with Java and Servlets Dynamic Call Center with C# and ASP.NET MVC TaskRouter.js v2: Reconnect Logic TaskRouter resource limits TaskRouter.js v1: Integrating TaskRouter to your browser-based applications Reporting Contact Center Blueprint Using Email and TaskRouter Together Dashboards Using Chat and TaskRouter Together Call Control Concepts Workspace Resource REST API: Workspace Statistics Workflow Resource Workflow Statistics Resource Worker Reservation resource Worker Channel Resource Task Resource Task Queue resource Task Channel resource Task Reservation Resource TaskRouter: REST API Reference Activity Resource Create Tasks from Phone Calls using TwiML: Receive an Incoming Call Create Tasks from Phone Calls using TwiML: End-to-End Test Create Tasks from Phone Calls using TwiML: Dequeue a Call to a Worker Create Tasks from Phone Calls using TwiML: Create a TaskRouter Task using Part 1. Setting up a TaskRouter Workspace Setting up a TaskRouter Workspace: Understanding Activities Setting up a TaskRouter Workspace: Create a Workspace Setting up a TaskRouter Workspace: Add and Configure a Workflow Setting up a TaskRouter Workspace: Add and Configure Workers Setting up a TaskRouter Workspace: Add and Configure TaskQueues Creating Tasks and Accepting Reservations: Create a Task using the REST API Creating Tasks and Accepting Reservations: Set up the Assignment Callback URL Creating Tasks and Accepting Reservations: Accept a Reservation using the REST API Creating Tasks and Accepting Reservations: Accept a Reservation using Assignment Callback Instructions TaskRouter Ruby Quickstart Control Worker Activities using Worker.js: Add an Agent UI to our Project Create Tasks from Phone Calls using TwiML: Receive an Incoming Call Create Tasks from Phone Calls using TwiML: End-to-End Phone Call Task Assignment Create Tasks from Phone Calls using TwiML: Dequeue a Call to a Worker Create Tasks from Phone Calls using TwiML: Create a TaskRouter Task using Setting up a TaskRouter Workspace: Create a Workspace Setting up a TaskRouter Workspace: Add and Configure a Workflow Setting up a TaskRouter Workspace: Add and Configure Workers Setting up a TaskRouter Workspace: Add and Configure TaskQueues Creating Tasks and Accepting Reservations: Create a Task using the REST API Creating Tasks and Accepting Reservations: Set up the Assignment Callback URL Creating Tasks and Accepting Reservations: Accept a Reservation using the REST API Creating Tasks and Accepting Reservations: Accept a Reservation using Assignment Callback Instructions TaskRouter: PHP quickstart Control Worker Activities using Worker.js: Add an Agent UI to our Project Create Tasks from Phone Calls using TwiML: Receive an Incoming Call Create Tasks from Phone Calls using TwiML: End-to-End Phone Call Task Assignment Create Tasks from Phone Calls using TwiML: Dequeue a Call to a Worker Create Tasks from Phone Calls using TwiML: Create a TaskRouter Task using Setting up a TaskRouter Workspace: Create a Workspace Setting up a TaskRouter Workspace: Add and Configure a Workflow Setting up a TaskRouter Workspace: Add and configure Workers Setting up a TaskRouter Workspace: Add and Configure TaskQueues Creating Tasks and Accepting Reservations: Create a Task using the REST API Creating Tasks and Accepting Reservations: Set up the Assignment Callback URL Creating Tasks and Accepting Reservations: Accept a Reservation using the REST API Creating Tasks and Accepting Reservations: Accept a Reservation using Assignment Callback Instructions TaskRouter Python Quickstart Control Worker Activities using Worker.js: Add an Agent UI to our Project TaskRouter .Net Quickstart Create Tasks from Phone Calls using TwiML: Receive an Incoming Call Create Tasks from Phone Calls using TwiML: End-to-End Phone Call Task Assignment Create Tasks from Phone Calls using TwiML: Dequeue a Call to a Worker Create Tasks from Phone Calls using TwiML: Create a TaskRouter Task using TaskRouter Java Quickstart TaskRouter.js v1 Worker: Managing workers in the browser TaskRouter.js v1 TaskQueue: Managing a TaskQueue resource in the browser TaskRouter.js v1 Workspace: Managing resources in the browser TaskRouter.js v1: Constructing JWTs: Managing access policies for client side requests Worker Statistics Resource Worker Resource REST API: TaskQueue Statistics TaskRouter Events reference Event Resource Trust Hub TrustHub REST API EndUserType resource EndUser Resource Customer Profiles Console: Create a Primary Customer Profile API: Create a Secondary Customer Profile TrustProduct Resource API: Create a Starter Profile CustomerProfile Resource CustomerProfileEvaluation Resource CustomerProfileEntityAssignment Resource CustomerProfileChannelEndpointAssignment Resource Twilio Bulk Messaging API Tags Sender Pools Twilio CLI Uninstall the Twilio CLI Command-Line Interface (CLI) Quickstart CLI Plugins Twilio CLI Update Install past versions of the Twilio CLI Install the Twilio CLI Use the Twilio CLI Docker image Work with webhooks Subaccounts Regional Profiles Output formatting and filtering Logging and debugging CLI Limitations CLI general usage Configuration Autocomplete CLI examples Get a phone number and send your first SMS Twilio Content Template Builder whatsapp/card whatsapp/authentication Using Variables with Content Templates Using Facebook Messenger with Content Templates Using Content Templates with Studio twilio/list-picker twilio/card twilio/text twilio/quick-reply twilio/pay twilio/media twilio/location twilio/catalog twilio/call-to-action Session Definitions Send templates created with the Content Template Builder Content Templates Overview Manage your templates with the Content Template Builder Twilio Content Template Builder twilio/flows FAQs and Troubleshooting Eligibility Badge Legend Create templates with the Content Template Builder in Console Content API Quickstart Content Types Overview Postman Collection twilio/carousel Content API Public Endpoints Twilio Conversations Memory observability traceability and lineage Conversation Memory observability Memory observability logs Memory stores Conversation Memory limits Conversation Memory key terms Conversation Memory overview Identity Resolution Getting started with Conversation Memory Conversation Memory concepts Using Conversation Memory APIs Enterprise Knowledge observability Enterprise Knowledge limits Using Enterprise Knowledge APIs Enterprise Knowledge Create an AI-ready knowledge base Twilio Conversations (classic) Twilio Conversations (classic) Twilio Email Twilio Email Stop sending unwanted email Configure account settings Check email message delivery Email concepts Authenticate email messages using DNS Encrypt with TLS Secure your Twilio account Email authentication Abuse awareness Warm up an IP address Spam notifications Establish and maintain reputation Yahoo Orange email security and reputation Microsoft Inbox provider authentication requirements Google Apple iCloud Manage Unsubscribes Deferrals Blocklists Blocklist provider insights Twilio Labs Twilio Labs Twilio Dev Phone Twilio Notify deprecated Twilio Notify deprecated Twilio Segment Twilio Segment Unify Onboarding Guide Profile API Unify Overview User Deletion and Suppression Data Retention and Deletion Policy Segment for Developers An introduction to Segment Filtering your Segment Data What is Segment? Getting Started Guide Testing and Debugging A Full Segment Implementation A Basic Segment Installation How Segment works Using Engage Data Testing connections Connections Overview Delivery Overview SQL Traits Custom Traits Computed Traits Profiles Sync Tables and Materialized Views Profiles Sync overview Linked Events Overview Data Graph Identity Resolution Overview Consent Management Overview Configure Consent Management MTUs, Throughput and Billing Config API Overview Public API Linked Audiences Engage Audiences Overview Spec: Track Spec: Screen What is the native mobile spec? Native Mobile Spec Spec Overview Spec: Identify Spec: Group Spec: Common fields Best Practices for Identifying Users Spec: Alias Set up Reverse ETL Reverse ETL Source Functions Destination Insert Functions Functions Overview Destination Functions Sources Overview Segment-Managed Custom Domain Destinations Overview Destination Filters Destination Actions Protocols Tracking Plan Data Collection Best Practices Typewriter Predictions Nutrition Facts Label Set up Profiles Sync Event-Triggered Journeys Warehouse Schemas Data Warehouses Warehouse FAQs Spec: V2 Ecommerce Events Source Schema Quickstart: Analytics.js Analytics.js Source Managing identity in Analytics.js Self-Managed Custom Proxy Client-side persistence in Analytics.js Analytics for Python Analytics for Node.js HTTP API Source Analytics-Swift for iOS and Apple Twilio SendGrid Twilio SendGrid Twilio SendGrid developer documentation Email concepts Email Flow SendGrid v3 API reference X-Message-ID Webhook Web API Urchin Tracking Module (UTM) parameters Unsubscribe Unknown User Undelivered Email Two Factor Authentication (2FA) Trusted sender Triggered email Triggered action Transactional email Transactional Email Templates Transport Layer Security (TLS) Time zone Throttling Teammates Reserved substitution tags Suspicious Sender Subscriber list management Spoofing Sender Policy Framework (SPF) Spam Spam Traps Spam report Spam Filter Simple Mail Transfer Protocol (SMTP) SMTP service SMTP Server SMTP relay SMTP Provider SMTP API Single send Sends Senders Sender ID Sender authentication Segments Segmentation Scheduled Emails Reverse DNS Reserved fields Reseller email account Request Reconfirmation email Rate limiting Pointer record (PTR) Programmatic media buying Preheader Phishing Peer-initiated invitations campaign Open & Unique Open Open relay Open Rate Native advertising Mail Exchanger record (MX) Mail User Agent (MUA) Mail Transfer Agent (MTA) Twilio SendGrid message ID Mailbox provider Mail merge Lists Link branding IP address warmup IP Address https://www.ietf.org/ SendGrid Glossary Internet Message Access Protocol (IMAP) Header General Data Protection Regulation of 2018 Frequency capping Fully Qualified Domain Name (FQDN) Flighting Feedback loop Expired Expandable Banner Email service provider (ESP) Email reputation score Email marketing Email harvesting Email Authentication Email API integration Drops Drip campaign Domain Domain authentication Domain Name System Domain-based Message Authentication, Reporting and Conformance (DMARC) DomainKeys Identified Mail (DKIM) Direct response advertising Demand-side platform (DSP) Delivery Deliverability Deferral Custom fields Click-through rate Complaint Canonical Name record (CNAME) Clicks and unique clicks Challenge-response spam filtering Content delivery network Categories Canadian Anti-Spam Law of 2014 Canonicalization CAN-SPAM Act of 2003 Campaigns Bulk mail folder Bulk email service Bounced email messages Blocked email messages Blocklist Bayesian filter Autoresponder Automated email Allowlist Affirmative consent Affiliate marketing Ad unit Ad impression Ad exchange Twilio SendGrid user interface documentation Twilio SendGrid Event Webhook Overview Event Webhook Node.js Code Example Getting started with the Event Webhook Getting Started with the Event Webhook Security Features Event Webhook Reference Event Webhook C# Code Example Sending Email with Microsoft Azure Migrating from a partner account Migrate from Twilio SendGrid API v2 to v3 Configure the inbound parse webhook Inbound Email Parse Webhook v3 API Python Code Example v3 Mail Send FAQ v3 API Java Code Example v3 API C# Code Example Using Handlebars Upgrade your authentication method to API keys Unique Arguments Support for TLS 1.2 Substitution Tags Stopping an in-progress send SMTP Errors and Troubleshooting Single Sends 2020 Update Sender Identity Segmentation Query Language Reference Scheduling Email Sandbox Mode Ruby on Rails Email API Quickstart for Ruby Email API Quickstart: How to Send Email with Python Email API Quickstart for PHP Email API Quickstart for Node.js Email API Quickstart for Go Postfix Personalizations API Libraries Send Email in Laravel Integrating with the SMTP API How to Create a Subuser with the API Getting Started with Transactional Email How to send an Email with SMTP Getting Started with the Email Activity Feed API Enforced TLS Email API Quickstart for Java Email API Quickstart for C# Django cURL Examples for Common Use Cases Cross Origin Resource Sharing (CORS) Working with Categories Building an X-SMTPAPI Header Automate Adding Subusers with the SendGrid API Authentication Getting started with the SendGrid API Encrypt with TLS Secure your Twilio account Email authentication Abuse awareness Warm up an IP address Spam notifications Establish and maintain reputation Yahoo email authentication and reputation Orange email security and reputation Microsoft Inbox provider authentication requirements Google Apple iCloud Manage Unsubscribes Deferrals Blocklists Blocklist provider insights Test Event Notification Settings Webhooks https://api.sendgrid.com Get All Event Webhooks Create an Event Webhook Retrieve paged transactional templates. Retrieve a single transactional template. Transactional Templates Create a transactional template. Suppressions - Unsubscribe Groups Retrieve global email statistics Stats Create Single Send Settings - Tracking Settings - Inbound Parse Create a parse setting SendGrid Engagement Quality API Mail Send Mail Send API Overview Errors Responses Requests Rate Limits On Behalf Of How to use the SendGrid V3 API Errors Authorization Authentication Email Logs Filter messages by ID Filter all messages Real Time Email Address Validation - API Reference Request a Bulk Email Address Validation Upload URL Email Address Validation Request a CSV Email Activity Filter messages by message ID Filter all messages Download CSV Validate a domain authentication Domain Authentication Authenticate a domain Create Design Contacts Import Contacts Delete Contacts Add or update a contact Retrieve all bounces Delete API keys Create API keys API Key permissions Delete Account Create Account Account Provisioning API Remove IPs List IPs Add IPs Segmenting your Contacts Formatting a CSV Personalize and segment messages with custom fields Manage contacts Building your Contact list Integrations Create an email design The Weblink Substitution Tag Verify sending email servers with SPF Universal Links Substitution and Section Tags Unsubscribe with Subscription Tracking Single Sends Senders Authenticate a single sender List-Unsubscribe Invalid email addresses Suppressions Prepare your email Marketing Campaign Send an email with dynamic templates Group Unsubscribes Global Unsubscribes Get started with Automation HTML Formatting Issues Email Testing Choose an email editor Enforce authentication with a DMARC policy Use the Design Editor Improve deliverability Cross-Platform Email Design Manage recipients who unsubscribe Create and Edit Legacy Transactional Templates Use the Code Editor Manage bounced messages Manage blocked messages Sending Attachments with Digioh Adding Dynamic Content with Handlebars in Marketing Campaigns A/B Testing Your Single Send Statistics Overview Spam Reports Marketing Campaigns Statistics Email Logs Email Activity Feed Deliverability Insights Set up secure click tracking Click Tracking & HTML Best Practices Bounce and Block Classifications Verifying your Account Upgrade your plan Two-factor authentication Twilio Login Overview Troubleshooting Sender Authentication Troubleshooting Delays and Latency Tracking settings Teammates Teammate Permissions Subusers SendGrid Single Sign-On Twilio SendGrid Single Sign-On with Azure Active Directory Resetting your Username and Password Mail Settings Troubleshooting account login issues IP Pools IP Access Management Inbound Parse How to set up reverse DNS How to set up link branding Configure domain authentication Verify message integrity with DKIM Dedicated IP addresses Add a Custom SSL Configuration Configuring Sign in with Apple Billing API Keys Account Details Account Under Review Accessing email account associated with SendGrid Email Address Validation Overview Using CloudFlare as your Content Delivery Network (CDN) Content Delivery Networks Twilio Video Twilio Video Webinar Adding Virtual Backgrounds Components of a Twilio Video app Using the Network Quality API Using the DataTrack API - JavaScript Specify Audio and Video Constraints in JavaScript Telemedicine Virtual Visits Reconnection States and Events Programmable Video Quotas and Limits Platform SDK Support Policy Twilio Video technical overview Noise Cancellation Networking Considerations for Video Applications Media Security Managing codecs Legacy Video Room Types JavaScript Platform Overview Twilio Video Quickstart for JavaScript Video iOS Platform Overview iOS Video Application Recommendations and Best Practices Twilio Video Quickstart for iOS Twilio Video Video guides Guide to Scaling Applications Frequently asked questions Detecting the Dominant Speaker Configuring Audio, Video Input and Output devices Building a JS Video App: Recommendations and Best Practices Video Android Platform Overview Android Video Application Recommendations and Best Practices Twilio Video Quickstart for Android Add Programmable Voice Participants to Video Rooms Video Regions and Global Low Latency Using the Network Bandwidth Profile API User Identity & Access Tokens for Programmable Video Understanding Video Rooms Understanding Video Rooms APIs Understanding Video Recordings and Compositions Storing into AWS S3 Get Started with Twilio Video Part 1: Creating a Server with Python/Flask Get Started with Twilio Video Part 2: Creating the Frontend Get Started with Twilio Video Part 1: Creating a server with Node or Express Get Started with Twilio Video Part 2: Creating the Frontend Encrypting your Stored Media Developing High Quality Video Applications Video Log Analyzer API Preflight API Pre-call Testing and Diagnostics JavaScript Room Monitor JavaScript Logger Video Insights Firewall and Network Configuration Real-time Transcriptions for Video Track Subscriptions Status Callbacks Rooms Resource Recordings Resource Recording Rules PublishedTrack Participants Programmable Video REST API External S3 Recordings Encrypted Recordings Compositions Resource Composition Hooks Twilio for Salesforce Twilio for Salesforce Unified Profiles (Public Beta) Choose the traits to use (Public Beta) Set up and configure Unified Profiles (Public Beta) Connect your Segment space (Public Beta) Known issues and limitations in Unified Profiles (Public Beta) Unified Profiles (Public Beta) Confirm or update your customer identifier settings (Public Beta) Verify Viewing Logs with Twilio Console Verify Transactions for PSD2 Verify SNA Live Test Number Verify Events Verify Countries and Regions Deliverability Verification Stream Getting Started with Verification Templates Verify supported languages Singapore Sender ID Handling Verify RCS Upgrade Message Status Stream Verify Verify Channel Selection Verification and two-factor authentication best practices Default Languages for Phone Number Country Codes Consent and Opt-in Policy Verify Automatic SMS Fallback Overview Verify vs. Authy Verification Channels App Verification with Twilio SMS Verify WhatsApp Overview Bring Your Own WhatsApp Sender Verify TOTP Technical Overview Verify TOTP Overview Verify SMS overview Verify Silent Network Auth Technical Overview Verify Silent Network Auth Overview Verify TOTP Quickstart Verify Python Flask Quickstart Verify PHP Laravel Quickstart Verify Node.js Express Quickstart Verify Quickstarts Verify C# ASP.NET Core Quickstart Verify Push Client Library Technical Overview Verify Push & Silent Device Approval Overview Verify Geo Permissions Verify Fraud Guard Preventing Fraud in Verify Send Email Verifications with Verify and Twilio SendGrid Verify Push Webhooks Verifications Verification Check Verification Attempts Summary Templates Services Service Rate Limits Service Rate Limit Buckets Safe List Protect Your Verify Application with Service Rate Limits Verify API Factor Resource Verify v2 Error Codes Customization Options Challenge Resource Verification Attempts Access Token Resource Rate Limits and Timeouts WhatsApp Business Platform with Twilio Register WhatsApp senders using Self Sign-up Test WhatsApp messaging with the Sandbox Rich Messaging Features in the Twilio API for WhatsApp Key Concepts and Terms for the WhatsApp Business Platform with Twilio WhatsApp Business Platform with Twilio Guidance on WhatsApp Media Messages Editing your WhatsApp Business Profile Using Buttons In WhatsApp The WhatsApp Business Platform with Twilio: Best Practices and FAQs Using WhatsApp Business Accounts with Twilio Send WhatsApp notification messages with templates Send and Receive Media Messages with WhatsApp in Python Send and Receive Media Messages with WhatsApp in PHP Send and Receive Media Messages with WhatsApp in Node.js Send and Receive Media Messages with WhatsApp in C#/ASP.NET Send and Receive Media Messages with the Twilio API for WhatsApp Message template approvals and statuses Twilio API for WhatsApp Tutorials Quickstart: Send and receive WhatsApp messages Overview of the WhatsApp Business Platform with Twilio Twilio Event Streams for WhatsApp List of Corresponding Twilio and WhatsApp Error Codes Senders API - WhatsApp api Error and Warning Dictionary comms Sender Pools ## What is Twilio Documentation's llms.txt? Twilio Documentation publishes an `/llms.txt` file that provides AI systems with a structured index of its documentation. It follows the [llms.txt specification](https://llmstxt.org), organizing links to guides, API references, and tutorials under section headings so that LLMs like ChatGPT, Claude, and Gemini can quickly understand what Twilio Documentation offers and where to find details. Pass Spec 45 Sections 1684 Links 349.8 KB Size ~89.5k Tokens Sections: Authy: 2FA and Passwordless Login · Building with AI · Conversation Intelligence (classic) · Elastic SIP Trunking · Event Streams · Flex · and 39 more ## Add Twilio Documentation Docs to Your AI Assistant Select your tool to see how to add Twilio Documentation's llms.txt as a documentation source. Cursor Windsurf Claude Code ChatGPT Zed Copilot 1. 1 Open any chat or composer panel 2. 2 Type @Docs and select "Add new doc" 3. 3 Paste the URL: https://www.twilio.com/llms.txt 4. 4 Wait for the green dot (indexing complete) 5. 5 Reference @Docs in chat when asking about Twilio Documentation Cursor crawls the URL and indexes all subpages. Add a trailing slash to index child pages too. ## Spec Compliance 1684 notes ## Frequently Asked Questions Where is Twilio Documentation's llms.txt file? Twilio Documentation publishes its llms.txt at https://www.twilio.com/llms.txt. This file provides a structured, markdown-formatted index of Twilio Documentation's documentation that AI systems can consume to understand the project's APIs, guides, and references. How do I use Twilio Documentation's llms.txt with AI coding assistants? Copy the llms.txt content and paste it into your AI assistant (Cursor, Windsurf, Claude, ChatGPT) as context. This gives the AI an accurate map of Twilio Documentation's documentation so it can provide better code suggestions and answers about Twilio Documentation. What does Twilio Documentation's llms.txt contain? Twilio Documentation's llms.txt contains 45 sections and 1684 documentation links in 349.8 KB (~89.5k tokens). Key sections include Authy: 2FA and Passwordless Login, Building with AI, Conversation Intelligence (classic), Elastic SIP Trunking, Event Streams, Flex. How many tokens does Twilio Documentation's llms.txt use? The concise llms.txt index is approximately 89.5k tokens (349.8 KB). Most AI assistants can fit this within their context window. For the full expanded documentation, look for an llms-full.txt variant which embeds all content inline. What is Twilio Documentation? Reference documentation for all Twilio products. Code snippets, tutorials, and sample apps for common use cases and communications solutions.. Twilio Documentation's llms.txt file helps AI systems understand this by providing a structured overview of its documentation, making it easier for developers to get accurate AI-assisted help when working with Twilio Documentation. Can I generate an llms.txt for my own project? Yes. Use the free llms.txt generator at mdream.dev/tools/llms-txt/generator to crawl your site and produce a spec-compliant llms.txt file. 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