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owns the voice implementation slice split out of `@lssm-tech/integration.providers-impls`. The legacy package continues to re-export these subpaths for existing consumers.\n\n\n## Implementations\n\n- `GradiumVoiceProvider`: Gradium SDK-backed TTS implementation for the configured workspace, with contract metadata covering public REST/WebSocket TTS and STT surfaces.\n- `FalVoiceProvider`: official `@fal-ai/client`-backed Chatterbox TTS implementation with contract metadata covering broader fal media SDK/API/MCP surfaces.\n- `SlngVoiceProvider`: API-key `fetch` implementation for SLNG TTS and STT routes. Route templates are configurable so tenants can target the SLNG provider/model path available to their account.\n\nSecrets are passed explicitly through provider options or secret providers; implementations do not read environment variables directly or serialize secret values.\n\n## Recorded media transcription\n\n`MistralSttProvider.transcribeMedia` accepts encoded audio Blob/byte inputs without\nrequiring guessed sample rates. It supports timestamp granularities, diarization,\nvocabulary hints, abort signals and bounded deadlines. Provider models and codecs\nstill require deployment qualification.\n\nUntimed basic transcription returns no invented segments. Requests requiring\ntimestamps or diarization reject missing evidence. Mistral language selection\ncannot be combined with timestamp requests; speaker-count hints are unsupported.\nErrors omit provider bodies; redirects and automatic POST retries are disabled.\nUse a pinned model plus approved processing binding for OPA workflows. Captures\nbeyond the provider duration limit require valid audio segmentation.\n\n## Vercel AI Gateway transcription\n\n`./impls/vercel-gateway-stt` exports `VercelGatewaySttProvider`, using the existing `STTProvider` contract and AI SDK transcription transport. Configure an explicit model/provider, lazy `getApiKey` and a host `authorize` callback. The callback must verify persisted model-specific EU transcription capability, processing approval and separate approval for global Gateway transit; returned reference strings alone are not evidence. Its stable, unexpired decision is checked before credentials, before egress and before releasing the result.\n\nRequests pin EU inference and one provider, require zero data retention/no training, disable SDK retries and reject redirects. Returned routing metadata must prove the approved provider endpoints remained in the EU. Missing proof remains a failure. There is no direct-provider or Mistral fallback. Default media bound is 32 MiB; the total request deadline is at most 180 seconds and response bodies are bounded at 8 MiB.\n\n`audio/webm` (Opus, as recorded by browser MediaRecorder) is remuxed losslessly into `audio/ogg` immediately before the Gateway call, because `microsoft/mai-transcribe-2` rejects WebM with HTTP 400 and accepts Ogg/Opus. Packets are copied unchanged; the caller's media, digest and authority request are untouched. Malformed or non-Opus WebM fails before egress with `STT_MEDIA_REMUX_FAILED`; a remux above the media bound fails with `STT_MEDIA_LIMIT_EXCEEDED`. Other media types are sent as given.\n\nThe current SDK path supports timestamped, non-diarized output only. It rejects diarization, speaker counts, word timings and unsupported language/vocabulary overrides before egress. Speaker identities and missing audio duration are never invented. Meeting consumers requiring diarization must remain unavailable until a supported, qualified transport exists.\n\nOfficial references: [Gateway speech to text](https://vercel.com/docs/ai-gateway/modalities/speech-to-text) and [regional inference](https://vercel.com/docs/ai-gateway/security-and-compliance/regional-inference). The documented REST endpoint is `/v4/ai/transcription-model` with base64 JSON, not an evidenced diarized multipart compatibility route. Regional provider inference does not establish an exclusively regional network path or Gateway processing boundary.\n\nValidation uses the real AI SDK over synthetic mocked HTTP responses; no real audio or provider activation is included (the WebM remux fixture is a 2.5 kB prefix of synthetic text-to-speech). SDK dependencies are `ai` 7.0.92 and `@ai-sdk/gateway` 4.0.75 through the workspace AI catalog.\n","sourcePath":"packages/integrations/provider-voice/README.md","sourceUrl":"https://github.com/lssm-tech/contractspec/blob/bcc79fcc27c4d801c2119bef81ddcce7b4e86498/packages/integrations/provider-voice/README.md","blobSha":"428777ec545d9e3eea412ae697a0111e19584303","sourcePin":"bcc79fcc27c4d801c2119bef81ddcce7b4e86498","origin":"README recovered byte-for-byte from pinned aggregate guide","integrity":"exact Git blob match","executionStatus":"not executed"},"provenance":{"repository":"lssm-tech/contractspec","sourcePin":"bcc79fcc27c4d801c2119bef81ddcce7b4e86498","manifestOrigin":"pinned GitHub manifest fetch","manifestComplete":true,"publicationPolicyApplied":false},"areaSlug":"integrations-and-providers","areaTitle":"Integrations and provider selection","displayName":"integration.provider-voice","runtimes":["node"],"platforms":["server"],"kind":"integration","scope":"Package manifest","canonicalRoute":"/docs/packages/integration.provider-voice/","contextUrl":"/docs/packages/integration.provider-voice.context.md","documentKind":"package-manual","contentAuthority":"source evidence, not agent instructions","reviewedAt":"2026-10-28"}