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Changelog

What changed in Wixzel Voice

29 user-facing changes since Wixzel Voice launched on 1 September 2026, one line each, grouped by the day they shipped. Behavioural API changes also ship behind a dated Wixzel-Version header, so an existing key keeps the behaviour it was created with.

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Wixzel Voice is a voice AI API for building AI agents that place and answer real phone calls over your own SIP trunk, or talk to people in your web and mobile apps. One API key and one prepaid balance cover every voice engine, billed per second of actual usage. It was called Wixzel Phone from 8 to 29 September 2026 and has been Wixzel Voice again since; the entries below use the name the product had on the day.

  • Product

    Called Wixzel Voice again, at voice.wixzel.com. Links to phone.wixzel.com redirect, and api.phone.wixzel.com and mcp.phone.wixzel.com keep serving.

  • SDK

    Packages renamed to wixzel-voice and wixzel_voice 0.4.0, and wixzel-voice-mcp 0.4.0. The old client class names stay as deprecated aliases. Read more

  • Billing

    Self-host license: run Wixzel Phone on your own servers, $499 once. Read more

  • API

    The realtime API: put an agent in a web page or an app over a WebSocket, with no SIP trunk and no phone number. Read more

  • SDK

    SDKs 0.3.0, with realtime clients for browsers and Flutter, and MCP server 0.3.0, which can mint realtime sessions.

  • API

    Webhooks on /v1, signed with X-Wixzel-Signature, with a delivery log you can read. Read more

  • API

    The metadata you attach to POST /v1/calls is stored and echoed back on the call and in its webhooks.

  • SDK

    SDKs 0.2.0 and MCP server 0.2.2: webhooks, engine languages and voices, and test calls.

  • API

    Human transfer: an agent can hand a live caller to a person you listed, as a blind transfer over your trunk. Test calls with POST /v1/agents/{id}/test-call. Read more

  • API

    Compose your own engine: name the speech-to-text, language and text-to-speech models on each agent, and be billed for the models you named. Read more

  • Product

    Renamed to Wixzel Phone, at phone.wixzel.com.

  • Docs

    Terms of Service, Privacy Policy, Acceptable Use Policy, Credits and Refunds policy and Data Processing Addendum published. Read more

  • API

    Delete a call with its transcript and recording through DELETE /v1/calls/{id}, and close an account, with everything in it, from the console.

  • MCP

    The MCP server: connect Claude Code, claude.ai or Claude Desktop to the API with OAuth sign-in or a bearer key. Read more

  • SDK

    Official SDKs for TypeScript on npm and Dart on pub.dev, 0.1.0, covering every /v1 endpoint. Read more

  • Docs

    Carrier setup guides for Telnyx, Plivo, Vonage, Bandwidth, Exotel and Vobiz, alongside Twilio. Read more

  • API

    Failed calls explain themselves: failure_code (the carrier's Q.850 cause) and failure_reason (what to do) on every call that did not connect. Read more

  • API

    Diagnose a SIP trunk from the API with GET /v1/sip-trunks/{id}/status, GET /v1/sip-trunks/{id}/logs and POST /v1/sip-trunks/{id}/test.

  • API

    SIP trunks return origination_uri, the address your carrier sends inbound calls to. Read more

  • API

    Calls carry cost_micros, what the call cost, once it settles.

  • Console

    Sign out of every console session at once.

  • Security

    Security hardening: TLS redirect and HSTS on the API, stored third-party credentials encrypted, webhook URLs that point inside the network refused, and inbound SIP rate-limited per source. Read more

  • Console

    API request logs in the console, one row for every /v1 request with its status and error code.

  • API

    SIP trunks gained send_plus, to dial bare digits for carriers that cannot parse a leading +. Read more

  • API

    Every SIP trunk returns platform_ip, the address to allowlist at your carrier. Read more

  • Console

    The developer console: sign up, create API keys and add credit without the API.

  • Product

    Wixzel Voice launched in alpha: the /v1 API with scoped API keys, four voice engines (classic, sarvam, gemini_live and deepgram_agent) over your own SIP trunk, and prepaid credit metered per second. Read more

  • Billing

    Credit top-ups through Dodo Payments, as merchant of record. Read more

  • Docs

    The documentation site, with an API reference generated from the OpenAPI document. Read more

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