Documentation

Reference material for teams that build and operate communications systems.

The docs landing page helps developers find API references, migration paths, compatibility notes, SIP guides, webhook verification, and operational runbooks without reading marketing copy first.

VoiceML guide API reference

Documentation sections

  • VoiceML

    Overview, verbs, attributes, callbacks, compatibility notes, XML examples, and migration guide.

  • REST API

    Accounts, calls, recordings, conferences, queues, applications, numbers, messaging, lookups, porting, and gateways where supported.

  • VoiceTel SDKs

    Official client libraries for the VoiceTel REST API in Python, TypeScript, Go, Java, Kotlin, Scala, PHP, Ruby, C#, Rust, Swift, and Lua. Plus CLI and Postman/Bruno collections.

  • VoiceML SDKs

    Official client libraries for the VoiceML voice + AMD API in Python, TypeScript, Go, Java, C#, PHP, Ruby, and Swift.

  • SDK migration

    Host-override examples and webhook validation patterns for official Twilio helper libraries where compatible.

  • SIP integrations

    Asterisk, FreePBX, FreeSWITCH, FusionPBX, SBC, firewall, and SDN appliance guides.

  • Messaging

    Send, receive, delivery receipts, A2P 10DLC, carrier-fee handling, and high-volume onboarding.

  • Numbers

    Provisioning, porting, emergency service, CNAM, caller ID, and number-routing workflows.

  • E911

    Validate addresses, provision E911 records, and manage emergency service for your numbers via the REST API.