> ## Documentation Index
> Fetch the complete documentation index at: https://dialnexa.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# List Speech To Speech Voices

> List realtime Speech to Speech voices with compatible languages and LLMs.

<Warning>
  **Legacy endpoint - deprecated.** Unversioned endpoints are scheduled for removal on **July 31, 2026**. Use the [`/v1` version](/docs/api-reference/v1/voices/s2s) for new integrations. This endpoint remains available for existing integrations until then.
</Warning>

Returns Speech to Speech voices with the languages and realtime LLM paths each voice supports. Use this endpoint when building a Speech to Speech voice selector or validating an agent configuration before saving it.

## Related endpoints

* [Speech To Speech Agents](/docs/agents/speech-to-speech-agents): configure realtime agents.
* [List Voices](/docs/api-reference/v1/voices/list): list cascaded TTS voices.
* [List Voice Languages](/docs/api-reference/v1/voices/languages): inspect language choices for one voice.


## OpenAPI

````yaml GET /voices/s2s
openapi: 3.0.0
info:
  title: DialNexa API
  description: >-
    Public REST API for the DialNexa voice AI platform. Versioned endpoints are
    under /v1; unversioned endpoints are legacy and deprecated.
  version: 1.0.0
servers:
  - url: https://api.dialnexa.com
    description: DialNexa production API
security:
  - bearer: []
tags:
  - name: API Keys
  - name: Agent Functions
  - name: Agents V1
  - name: Agents2
  - name: Batch Calls
  - name: Batch Calls V1
  - name: Call Logs
  - name: Calls
  - name: Calls V1
  - name: Campaign Leads
  - name: Campaigns
  - name: External Webhooks
  - name: Knowledge Base
  - name: Knowledge Base V1
  - name: LLMs
  - name: LLMs V1
  - name: Languages
  - name: Languages V1
  - name: Organization Phone Numbers
  - name: Organization Phone Numbers V1
  - name: Phone Number Pricing
  - name: Phone Number Pricing V1
  - name: Transcribers
  - name: Transcribers V1
  - name: User Webhooks
  - name: User Webhooks V1
  - name: V1
  - name: Voices
  - name: Voices V1
  - name: Webcall
  - name: Workflow Leads
  - name: Workflow Leads V1
  - name: Workflows
  - name: Workflows V1
paths:
  /voices/s2s:
    get:
      tags:
        - Voices
      summary: Get all S2S voices with supported languages and LLMs
      description: >-
        **Legacy endpoint - deprecated, scheduled for removal on July 31,
        2026.** Use the `/v1` version for new integrations. 
      operationId: VoicesController_findAllS2SVoices
      parameters: []
      responses:
        '200':
          description: Returns all S2S voices with their supported languages and LLMs
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/S2SVoicesResponseDto'
      deprecated: true
components:
  schemas:
    S2SVoicesResponseDto:
      type: object
      properties:
        voices:
          type: array
          items:
            $ref: '#/components/schemas/S2SVoiceDto'
      required:
        - voices
    S2SVoiceDto:
      type: object
      properties:
        id:
          type: string
          example: voice_abc123456789
        name:
          type: string
          example: Ash
        provider:
          type: string
          example: openai
          nullable: true
        provider_voice_id:
          type: string
          example: ash
          nullable: true
        gender:
          type: string
          example: male
        accent:
          type: string
          example: american
          nullable: true
        icon:
          type: string
          nullable: true
        recording:
          type: string
          nullable: true
        languages:
          type: array
          items:
            $ref: '#/components/schemas/S2SLanguageSummaryDto'
        llms:
          type: array
          items:
            $ref: '#/components/schemas/S2SLlmSummaryDto'
      required:
        - id
        - name
        - provider
        - provider_voice_id
        - gender
        - accent
        - icon
        - recording
        - languages
        - llms
    S2SLanguageSummaryDto:
      type: object
      properties:
        id:
          type: string
          example: mj17k2hwviopty
        name:
          type: string
          example: Hindi
        code:
          type: string
          example: hi
      required:
        - id
        - name
        - code
    S2SLlmSummaryDto:
      type: object
      properties:
        id:
          type: string
          example: llm_abc123456789
        name:
          type: string
          example: GPT Realtime 2
        provider:
          type: string
          example: openai
        provider_id:
          type: string
          example: gpt-realtime-2
      required:
        - id
        - name
        - provider
        - provider_id
  securitySchemes:
    bearer:
      scheme: bearer
      bearerFormat: JWT
      type: http

````