> ## Documentation Index > Fetch the complete documentation index at: https://docs.slng.ai/llms.txt > Use this file to discover all available pages before exploring further. # Cognigy STT > Stream live audio to SLNG over the Cognigy Voice Gateway WebSocket protocol and receive real-time STT transcripts from any supported model. ## AsyncAPI ````yaml api-reference/asyncapi/bridges-cognigy.asyncapi.yaml /v1/bridges/cognigy/stt/{model_variant} id: /v1/bridges/cognigy/stt/{model_variant} title: Cognigy STT Bridge description: >- Stream live audio to SLNG over the Cognigy Voice Gateway WebSocket protocol and receive real-time STT transcripts from any supported model. servers: - id: production protocol: wss host: api.slng.ai bindings: [] variables: [] - id: staging protocol: wss host: stageapi.slng.ai bindings: [] variables: [] address: /v1/bridges/cognigy/stt/{model_variant} parameters: [] bindings: - protocol: ws version: latest value: method: GET headers: type: object properties: X-Region-Override: type: string description: Target region override. Auto-selected if not provided. x-parser-schema-id: X-World-Part-Override: type: string description: Target world part override. Auto-selected if not provided. x-parser-schema-id: x-parser-schema-id: WebsocketHeaders query: type: object properties: region: type: string description: >- Target region override as a query parameter. Auto-selected if not provided. Equivalent to the `X-Region-Override` header; the header takes precedence when both are set. enum: - ap-southeast-2 - eu-north-1 - us-east-1 x-parser-schema-id: world-part: type: string description: >- Target world part override as a query parameter. Auto-selected if not provided. Equivalent to the `X-World-Part-Override` header; the header takes precedence when both are set. enum: - ap - eu - na x-parser-schema-id: x-parser-schema-id: WebsocketQueryParams schemaProperties: - name: method type: string description: GET required: false - name: headers type: object required: false properties: - name: X-Region-Override type: string description: Target region override. Auto-selected if not provided. required: false - name: X-World-Part-Override type: string description: Target world part override. Auto-selected if not provided. required: false - name: query type: object required: false properties: - name: region type: string description: >- Target region override as a query parameter. Auto-selected if not provided. Equivalent to the `X-Region-Override` header; the header takes precedence when both are set. enumValues: - ap-southeast-2 - eu-north-1 - us-east-1 required: false - name: world-part type: string description: >- Target world part override as a query parameter. Auto-selected if not provided. Equivalent to the `X-World-Part-Override` header; the header takes precedence when both are set. enumValues: - ap - eu - na required: false operations: - &ref_2 id: cognigySttBridgeReceiveStart title: Cognigy stt bridge receive start description: Start session on Cognigy STT Bridge type: receive messages: - &ref_7 id: CognigyStartMessage contentType: application/json payload: - name: Start Message description: Initialize Cognigy STT session with language and sample rate. type: object properties: - name: type type: string description: start required: true - name: language type: string description: ISO-639-1 language code. enumValues: - en - ja - zh - de - hi - fr - ko - pt - it - es - id - nl - tr - fil - pl - sv - bg - ro - ar - cs - el - fi - hr - ms - sk - da - ta - uk - ru - hu - 'no' - vi required: false - name: sample_rate type: number description: Audio sample rate in Hz. enumValues: - 8000 - 16000 - 22050 - 24000 - 32000 - 48000 required: false headers: [] jsonPayloadSchema: type: object description: Initialize STT session with language and sample rate configuration. required: - type properties: type: type: string const: start x-parser-schema-id: language: &ref_1 type: string description: ISO-639-1 language code. enum: - en - ja - zh - de - hi - fr - ko - pt - it - es - id - nl - tr - fil - pl - sv - bg - ro - ar - cs - el - fi - hr - ms - sk - da - ta - uk - ru - hu - 'no' - vi x-parser-schema-id: LanguageCode sample_rate: type: number description: Audio sample rate in Hz. enum: - 8000 - 16000 - 22050 - 24000 - 32000 - 48000 x-parser-schema-id: x-parser-schema-id: title: Start Message description: Initialize Cognigy STT session with language and sample rate. example: |- { "type": "start", "language": "en", "sample_rate": 16000 } bindings: [] extensions: - id: x-parser-unique-object-id value: CognigyStartMessage bindings: [] extensions: &ref_0 - id: x-parser-unique-object-id value: /v1/bridges/cognigy/stt/{model_variant} - &ref_3 id: cognigySttBridgeReceiveStop title: Cognigy stt bridge receive stop description: Stop session on Cognigy STT Bridge type: receive messages: - &ref_8 id: CognigyStopMessage contentType: application/json payload: - name: Stop Message description: End the Cognigy STT session and finalize transcription. type: object properties: - name: type type: string description: stop required: true headers: [] jsonPayloadSchema: type: object description: End the STT session and finalize transcription. required: - type properties: type: type: string const: stop x-parser-schema-id: x-parser-schema-id: title: Stop Message description: End the Cognigy STT session and finalize transcription. example: |- { "type": "stop" } bindings: [] extensions: - id: x-parser-unique-object-id value: CognigyStopMessage bindings: [] extensions: *ref_0 - &ref_4 id: cognigySttBridgeReceiveKeepalive title: Cognigy stt bridge receive keepalive description: Send keepalive on Cognigy STT Bridge type: receive messages: - &ref_9 id: KeepaliveMessage contentType: application/json payload: - name: Keepalive Message description: Keep the WebSocket connection alive during silence. type: object properties: - name: type type: string description: keepalive required: true headers: [] jsonPayloadSchema: type: object description: >- Prevents the connection from being closed due to inactivity. Send periodically during silence to maintain the session. required: - type properties: type: type: string const: keepalive x-parser-schema-id: x-parser-schema-id: title: Keepalive Message description: Keep the WebSocket connection alive during silence. example: |- { "type": "keepalive" } bindings: [] extensions: - id: x-parser-unique-object-id value: KeepaliveMessage bindings: [] extensions: *ref_0 - &ref_5 id: cognigySttBridgeSendTranscription title: Cognigy stt bridge send transcription description: Receive transcription from Cognigy STT Bridge type: send messages: - &ref_10 id: CognigyTranscription contentType: application/json payload: - name: Transcription description: Transcription result with alternatives and metadata. type: object properties: - name: type type: string description: transcription required: true - name: is_final type: boolean description: Whether this is a final (not interim) transcription required: true - name: alternatives type: array description: List of transcription alternatives ranked by confidence required: true properties: - name: confidence type: number description: Confidence score (0-1) required: false - name: transcript type: string description: Transcribed text required: false - name: channel type: integer description: Audio channel number required: false - name: language type: string description: ISO-639-1 language code. enumValues: - en - ja - zh - de - hi - fr - ko - pt - it - es - id - nl - tr - fil - pl - sv - bg - ro - ar - cs - el - fi - hr - ms - sk - da - ta - uk - ru - hu - 'no' - vi required: false headers: [] jsonPayloadSchema: type: object description: Transcription result with alternatives and metadata. required: - type - is_final - alternatives properties: type: type: string const: transcription x-parser-schema-id: is_final: type: boolean description: Whether this is a final (not interim) transcription x-parser-schema-id: alternatives: type: array description: List of transcription alternatives ranked by confidence items: type: object properties: confidence: type: number description: Confidence score (0-1) x-parser-schema-id: transcript: type: string description: Transcribed text x-parser-schema-id: x-parser-schema-id: x-parser-schema-id: channel: type: integer description: Audio channel number x-parser-schema-id: language: *ref_1 x-parser-schema-id: title: Transcription description: Transcription result with alternatives and metadata. example: |- { "type": "transcription", "is_final": true, "alternatives": [ { "confidence": 0.95, "transcript": "Hello world" } ], "language": "en" } bindings: [] extensions: - id: x-parser-unique-object-id value: CognigyTranscription bindings: [] extensions: *ref_0 - &ref_6 id: cognigySttBridgeSendError title: Cognigy stt bridge send error description: Receive error from Cognigy STT Bridge type: send messages: - &ref_11 id: CognigySTTErrorResponse contentType: application/json payload: - name: Error Response (Cognigy STT) description: Error occurred during Cognigy STT recognition. type: object properties: - name: type type: string description: error required: true - name: error type: string description: >- Error code. May be omitted when the upstream provider does not surface a discrete error code. required: false - name: message type: string description: Human-readable error description required: true headers: [] jsonPayloadSchema: type: object description: Error occurred during recognition. required: - type - message properties: type: type: string const: error x-parser-schema-id: error: type: string description: >- Error code. May be omitted when the upstream provider does not surface a discrete error code. x-parser-schema-id: message: type: string description: Human-readable error description x-parser-schema-id: x-parser-schema-id: title: Error Response (Cognigy STT) description: Error occurred during Cognigy STT recognition. example: |- { "type": "error", "error": "config_error", "message": "Invalid language code" } bindings: [] extensions: - id: x-parser-unique-object-id value: CognigySTTErrorResponse bindings: [] extensions: *ref_0 sendOperations: - *ref_2 - *ref_3 - *ref_4 receiveOperations: - *ref_5 - *ref_6 sendMessages: - *ref_7 - *ref_8 - *ref_9 receiveMessages: - *ref_10 - *ref_11 extensions: - id: x-parser-unique-object-id value: /v1/bridges/cognigy/stt/{model_variant} securitySchemes: - id: bearer name: bearer type: http description: > API key issued by SLNG. Pass as `Authorization: Bearer ` in the WebSocket upgrade request headers. scheme: bearer extensions: [] ````