FreJun Teler Voice / Call Controls API

openapi: 3.2.0
info:
  title: Teler API Reference Voice / Call Controls API
  summary: Programmable voice infrastructure for AI agents.
  description: 'The Teler API lets you place and control programmable voice calls, stream live

    audio to AI agents, and observe everything that happens on a call in real time.'
  contact:
    name: Teler support
    email: support@frejun.com
  version: 0.1.0
servers:
- url: https://api.frejun.ai
  description: Production
security:
- ApiKeyAuth: []
tags:
- name: Voice / Call Controls
  description: Act on a live call in real time — hang up, mute, send DTMF, or play audio. These actions are accepted asynchronously and return `202` with a `request_id`.
paths:
  /api/v1/voice/calls/{call_id}/hangup:
    post:
      tags:
      - Voice / Call Controls
      summary: Hang up a call
      description: End a call, or a single leg of it. Omit `leg_id` to hang up the entire call; supply it to drop just that leg.
      operationId: hangup_call
      parameters:
      - name: call_id
        in: path
        required: true
        schema:
          type: string
          title: Call Id
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/HangupRequest'
      responses:
        '202':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MutationAccepted'
        '403':
          description: The `x-api-key` header is missing or invalid.
          content:
            application/json:
              example:
                success: false
                message: Invalid API Key.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: No call matches the supplied identifier for this account.
          content:
            application/json:
              example:
                success: false
                message: The requested call was not found.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '409':
          description: The call is not in a state that accepts controls (e.g. it has already ended). `code` is one of `call_not_live`, `leg_not_found`, `call_not_controllable`, or `feature_not_enabled`.
          content:
            application/json:
              example:
                success: false
                message: The call is not in a state that accepts controls.
                code: call_not_live
                type: invalid_state
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: The request body or query parameters failed validation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ValidationErrorResponse'
        '503':
          description: The call-control service is temporarily unavailable. Safe to retry.
          content:
            application/json:
              example:
                success: false
                message: The action could not be applied. Please try again.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /api/v1/voice/calls/{call_id}/mute:
    post:
      tags:
      - Voice / Call Controls
      summary: Mute or unmute a call leg
      description: 'Mute (`on: true`) or unmute (`on: false`) a specific leg of a call.'
      operationId: mute_call
      parameters:
      - name: call_id
        in: path
        required: true
        schema:
          type: string
          title: Call Id
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/MuteRequest'
      responses:
        '202':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MutationAccepted'
        '403':
          description: The `x-api-key` header is missing or invalid.
          content:
            application/json:
              example:
                success: false
                message: Invalid API Key.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: No call matches the supplied identifier for this account.
          content:
            application/json:
              example:
                success: false
                message: The requested call was not found.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '409':
          description: The call is not in a state that accepts controls (e.g. it has already ended). `code` is one of `call_not_live`, `leg_not_found`, `call_not_controllable`, or `feature_not_enabled`.
          content:
            application/json:
              example:
                success: false
                message: The call is not in a state that accepts controls.
                code: call_not_live
                type: invalid_state
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: The request body or query parameters failed validation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ValidationErrorResponse'
        '503':
          description: The call-control service is temporarily unavailable. Safe to retry.
          content:
            application/json:
              example:
                success: false
                message: The action could not be applied. Please try again.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /api/v1/voice/calls/{call_id}/dtmf:
    post:
      tags:
      - Voice / Call Controls
      summary: Send DTMF tones on a call leg
      description: Send DTMF (touch-tone) digits on a call leg, e.g. to navigate an IVR.
      operationId: send_dtmf
      parameters:
      - name: call_id
        in: path
        required: true
        schema:
          type: string
          title: Call Id
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DtmfRequest'
      responses:
        '202':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MutationAccepted'
        '403':
          description: The `x-api-key` header is missing or invalid.
          content:
            application/json:
              example:
                success: false
                message: Invalid API Key.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: No call matches the supplied identifier for this account.
          content:
            application/json:
              example:
                success: false
                message: The requested call was not found.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '409':
          description: The call is not in a state that accepts controls (e.g. it has already ended). `code` is one of `call_not_live`, `leg_not_found`, `call_not_controllable`, or `feature_not_enabled`.
          content:
            application/json:
              example:
                success: false
                message: The call is not in a state that accepts controls.
                code: call_not_live
                type: invalid_state
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: The request body or query parameters failed validation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ValidationErrorResponse'
        '503':
          description: The call-control service is temporarily unavailable. Safe to retry.
          content:
            application/json:
              example:
                success: false
                message: The action could not be applied. Please try again.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /api/v1/voice/calls/{call_id}/play:
    post:
      tags:
      - Voice / Call Controls
      summary: Play an audio file into the call
      description: Play an audio file into the call. The response includes a `playback_id` you can use to correlate playback lifecycle webhooks.
      operationId: play_audio
      parameters:
      - name: call_id
        in: path
        required: true
        schema:
          type: string
          title: Call Id
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PlayRequest'
      responses:
        '202':
          description: Successful Response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MutationAccepted'
        '403':
          description: The `x-api-key` header is missing or invalid.
          content:
            application/json:
              example:
                success: false
                message: Invalid API Key.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '404':
          description: No call matches the supplied identifier for this account.
          content:
            application/json:
              example:
                success: false
                message: The requested call was not found.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '409':
          description: The call is not in a state that accepts controls (e.g. it has already ended). `code` is one of `call_not_live`, `leg_not_found`, `call_not_controllable`, or `feature_not_enabled`.
          content:
            application/json:
              example:
                success: false
                message: The call is not in a state that accepts controls.
                code: call_not_live
                type: invalid_state
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: The request body or query parameters failed validation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ValidationErrorResponse'
        '503':
          description: The call-control service is temporarily unavailable. Safe to retry.
          content:
            application/json:
              example:
                success: false
                message: The action could not be applied. Please try again.
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    ErrorResponse:
      properties:
        success:
          type: boolean
          title: Success
          description: Always `false` on an error response.
          default: false
        message:
          type: string
          title: Message
          description: Human-readable description of what went wrong. Safe to show to a user.
        code:
          anyOf:
          - type: string
          - type: 'null'
          title: Code
          description: Stable, machine-readable error code. Present on business-rule errors (e.g. `transfer_in_progress`). Branch on this, not on `message`.
        type:
          anyOf:
          - type: string
          - type: 'null'
          title: Type
          description: Error category (e.g. `invalid_state`). Present on some conflict errors.
      type: object
      required:
      - message
      title: ErrorResponse
      description: Standard error envelope returned for all non-validation errors.
      example:
        message: The requested call was not found.
        success: false
    ValidationFieldError:
      properties:
        loc:
          items: {}
          type: array
          title: Loc
          description: Path to the offending field, e.g. `["body", "to_number"]`.
        msg:
          type: string
          title: Msg
          description: Human-readable explanation of the problem.
        type:
          type: string
          title: Type
          description: Programmatic error type, e.g. `string_pattern_mismatch`.
      type: object
      required:
      - loc
      - msg
      - type
      title: ValidationFieldError
      description: One field-level problem within a `422` validation error.
    MuteRequest:
      properties:
        leg_id:
          type: string
          title: Leg Id
          description: Leg to mute or unmute (`cl_` prefix).
        'on':
          type: boolean
          title: 'On'
          description: '`true` to mute the leg, `false` to unmute it.'
      additionalProperties: false
      type: object
      required:
      - leg_id
      - 'on'
      title: MuteRequest
      example:
        leg_id: cl_01JQ8Z9K7M3N2P4R5S6T7V8WAB
        'on': true
    PlayRequest:
      properties:
        leg_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Leg Id
          description: Leg to play audio into (`cl_` prefix). Defaults to the primary leg.
        media_url:
          type: string
          maxLength: 2083
          minLength: 1
          format: uri
          title: Media Url
          description: HTTPS URL of the audio file to play (WAV or MP3).
        loop:
          type: integer
          maximum: 10.0
          minimum: 1.0
          title: Loop
          description: How many times to play the file (1–10).
          default: 1
        on_dtmf:
          type: string
          enum:
          - stop
          - ignore
          title: On Dtmf
          description: Whether an inbound DTMF digit stops playback (`stop`) or is ignored (`ignore`).
          default: stop
      additionalProperties: false
      type: object
      required:
      - media_url
      title: PlayRequest
      example:
        loop: 1
        media_url: https://example.com/audio/greeting.wav
        on_dtmf: stop
    MutationAccepted:
      properties:
        request_id:
          type: string
          title: Request Id
          description: Identifier for this control request. Reuse it to correlate retries and webhooks.
        playback_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Playback Id
          description: Identifier of the started playback (`pb_` prefix). Only returned by the play action.
      additionalProperties: false
      type: object
      required:
      - request_id
      title: MutationAccepted
      example:
        request_id: req_9f8e7d6c5b4a3f2e1d0c9b8a
    HangupRequest:
      properties:
        leg_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Leg Id
          description: Leg to hang up (`cl_` prefix). Omit to end the entire call.
        reason:
          anyOf:
          - type: string
            maxLength: 64
            pattern: ^[A-Z0-9_]+$
          - type: 'null'
          title: Reason
          description: Optional machine-readable reason, e.g. `AGENT_HANGUP`. Uppercase, digits, and underscores only.
      additionalProperties: false
      type: object
      title: HangupRequest
      example:
        reason: AGENT_HANGUP
    DtmfRequest:
      properties:
        leg_id:
          anyOf:
          - type: string
          - type: 'null'
          title: Leg Id
          description: Leg to send the tones on (`cl_` prefix). Defaults to the primary leg.
        digits:
          type: string
          maxLength: 64
          minLength: 1
          pattern: ^[0-9*#A-D]+$
          title: Digits
          description: 'DTMF digits to send. Allowed characters: `0-9`, `*`, `#`, `A-D`.'
        duration_ms:
          type: integer
          maximum: 1000.0
          minimum: 40.0
          title: Duration Ms
          description: Duration of each tone in milliseconds (40–1000).
          default: 100
      additionalProperties: false
      type: object
      required:
      - digits
      title: DtmfRequest
      example:
        digits: 1234#
        duration_ms: 120
    ValidationErrorResponse:
      properties:
        success:
          type: boolean
          title: Success
          description: Always `false`.
          default: false
        message:
          type: string
          title: Message
          description: Always `"Validation Error"` for this response.
          default: Validation Error
        errors:
          items:
            $ref: '#/components/schemas/ValidationFieldError'
          type: array
          title: Errors
          description: One entry per field that failed validation.
      type: object
      required:
      - errors
      title: ValidationErrorResponse
      description: Returned with `422` when the request fails schema validation.
      example:
        errors:
        - loc:
          - body
          - to_number
          msg: String should match pattern '^\+\d{7,15}$'
          type: string_pattern_mismatch
        message: Validation Error
        success: false
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: x-api-key
      description: Your secret account API key. Create one in the Teler dashboard.