Sayna Python SDK

Python SDK for Sayna's real-time voice interaction API. Send audio for speech recognition, receive synthesized speech, and manage voice sessions from your Python applications.

Features

🎤 Speech-to-Text: Real-time transcription with support for multiple providers (Deepgram, Google, etc.)
🔊 Text-to-Speech: High-quality voice synthesis with various TTS providers (ElevenLabs, Google, etc.)
🔌 WebSocket Connection: Async/await support with aiohttp
🌐 REST API: Standalone endpoints for health checks, voice catalog, TTS synthesis, and SIP hooks management
🔐 Webhook Receiver: Secure verification and parsing of SIP webhooks with HMAC-SHA256 signatures
✅ Type Safety: Full type hints with Pydantic models
🚀 Easy to Use: Simple, intuitive API
📦 Modern Python: Built for Python 3.9+

Installation

pip install sayna-client

Room Scoping

Room names are sent to the server as-is; the SDK does not modify or prefix them. Access scoping is enforced server-side based on room metadata:

Room listings (get_livekit_rooms) are scoped to the authenticated context and may return fewer rooms than exist on the server.
Room operations (get_livekit_room, remove_livekit_participant, mute_livekit_participant_track, sip_transfer_rest) will return 404 if the room is not found or not accessible to the current authentication context.
Token generation (get_livekit_token) will return 403 if attempting to create a token for a room owned by a different tenant.
Inbound SIP-created rooms are owned by the routing configuration's auth_id and may not be accessible under other authentication contexts.

Do not attempt to work around access errors by modifying room names—the SDK does not rewrite them and the server enforces ownership.

Quick Start

import asyncio
from sayna_client import SaynaClient, STTConfig, TTSConfig

async def main():
    # Initialize the client with configs
    client = SaynaClient(
        url="https://api.sayna.ai",
        stt_config=STTConfig(
            provider="deepgram",
            model="nova-2"
        ),
        tts_config=TTSConfig(
            provider="cartesia",
            voice_id="example-voice"
        ),
        api_key="your-api-key"
    )

    # Register callbacks
    client.register_on_stt_result(lambda result: print(f"Transcription: {result.transcript}"))
    client.register_on_tts_audio(lambda audio: print(f"Received {len(audio)} bytes of audio"))

    # Connect and interact
    await client.connect()
    await client.speak("Hello, world!")
    await client.disconnect()

if __name__ == "__main__":
    asyncio.run(main())

API

REST API Methods

These methods use HTTP endpoints and don't require an active WebSocket connection:

`await client.health()`

Performs a health check on the Sayna server.

Returns: HealthResponse - Response object with status field ("OK" when healthy).

Example:

health = await client.health()
print(health.status)  # "OK"

`await client.get_voices()`

Retrieves the catalogue of text-to-speech voices grouped by provider.

Returns: dict[str, list[VoiceDescriptor]] - Dictionary where keys are provider names and values are lists of voice descriptors.

Example:

voices = await client.get_voices()
for provider, voice_list in voices.items():
    print(f"{provider}:", [v.name for v in voice_list])

`await client.speak_rest(text, tts_config)`

Synthesizes text into audio using the REST API. This is a standalone method that doesn't require an active WebSocket connection.

Parameter	Type	Purpose
`text`	`str`	Text to synthesize (must be non-empty).
`tts_config`	`TTSConfig`	Text-to-speech provider configuration.

Returns: tuple[bytes, dict[str, str]] - Tuple of (audio_data, response_headers). Headers include: Content-Type, Content-Length, x-audio-format, x-sample-rate.

Example:

audio_data, headers = await client.speak_rest("Hello, world!", TTSConfig(
    provider="elevenlabs",
    voice_id="21m00Tcm4TlvDq8ikWAM",
    model="eleven_turbo_v2",
    speaking_rate=1.0,
    audio_format="mp3",
    sample_rate=24000,
    connection_timeout=30,
    request_timeout=60,
    pronunciations=[]
))
print(f"Received {len(audio_data)} bytes of {headers['Content-Type']}")

`await client.get_livekit_token(room_name, participant_name, participant_identity)`

Issues a LiveKit access token for a participant. Room names are sent as-is; the SDK does not modify them. Access scoping is enforced server-side.

Parameter	Type	Purpose
`room_name`	`str`	LiveKit room to join or create.
`participant_name`	`str`	Display name for the participant.
`participant_identity`	`str`	Unique identifier for the participant.

Returns: LiveKitTokenResponse - Object containing token, room name, participant identity, and LiveKit URL.

Raises: SaynaHttpError with status 403 if the room exists but belongs to a different authenticated context (ownership conflict). Do not retry with modified names.

Example:

token_info = await client.get_livekit_token(
    "my-room",
    "John Doe",
    "user-123"
)
print("Token:", token_info.token)
print("LiveKit URL:", token_info.livekit_url)

`await client.get_sip_hooks()`

Retrieves all configured SIP webhook hooks from the runtime cache.

Returns: SipHooksResponse - Object containing the list of configured SIP hooks.

Example:

hooks = await client.get_sip_hooks()
for hook in hooks.hooks:
    print(f"{hook.host} -> {hook.url} (auth_id: {hook.auth_id})")

`await client.set_sip_hooks(hooks)`

Adds or replaces SIP webhook hooks. Existing hooks with matching hosts (case-insensitive) are replaced.

Parameter	Type	Purpose
`hooks`	`list[SipHook]`	List of SipHook objects to add or replace.

Each SipHook requires an auth_id field that associates inbound SIP calls with a tenant for room ownership. When AUTH_REQUIRED=true on the server, auth_id must be non-empty. When AUTH_REQUIRED=false, auth_id may be empty but must still be provided.

Returns: SipHooksResponse - Object containing the merged list of all hooks (existing + new).

Example:

from sayna_client import SipHook

hooks = [
    SipHook(
        host="example.com",
        url="https://webhook.example.com/events",
        auth_id="tenant-123",
    ),
    SipHook(
        host="another.com",
        url="https://webhook.another.com/events",
        auth_id="tenant-456",
    ),
]
response = await client.set_sip_hooks(hooks)
print(f"Total hooks: {len(response.hooks)}")

WebSocket API Methods

These methods require an active WebSocket connection:

`SaynaClient(url, stt_config, tts_config, livekit_config=None, without_audio=False, api_key=None)`

Creates a new SaynaClient instance.

Parameter	Type	Default	Purpose
`url`	`str`	-	Sayna server URL (http://, https://, ws://, or wss://).
`stt_config`	`STTConfig`	-	Speech-to-text provider configuration.
`tts_config`	`TTSConfig`	-	Text-to-speech provider configuration.
`livekit_config`	`LiveKitConfig` (optional)	`None`	Optional LiveKit room configuration.
`without_audio`	`bool`	`False`	Disable audio streaming.
`api_key`	`str` (optional)	`None`	API key for authentication.

`await client.connect()`

Establishes the WebSocket connection and sends the initial configuration. connect() does not wait for the ready event; check client.ready or register client.register_on_ready(callback) if you need to gate work on readiness.

`client.register_on_stt_result(callback)`

Registers a callback for speech-to-text transcription results.

Example:

def handle_stt(result):
    print(f"Transcription: {result.transcript}")

client.register_on_stt_result(handle_stt)

`client.register_on_tts_audio(callback)`

Registers a callback for text-to-speech audio data.

Example:

def handle_audio(audio_data: bytes):
    print(f"Received {len(audio_data)} bytes of audio")

client.register_on_tts_audio(handle_audio)

`client.register_on_error(callback)`

Registers a callback for error messages. Ownership and access errors from WebSocket operations may arrive as error callbacks. If you receive access errors, verify that you are using the correct room name and that the room belongs to your authenticated context. Do not retry with modified names—the SDK does not rewrite room names.

`client.register_on_message(callback)`

Registers a callback for participant messages.

`client.register_on_participant_connected(callback)`

Registers a callback for participant connection events.

`client.register_on_participant_disconnected(callback)`

Registers a callback for participant disconnection events.

`client.register_on_track_subscribed(callback)`

Registers a callback for track subscription events.

`client.register_on_tts_playback_complete(callback)`

Registers a callback for TTS playback completion events.

Unknown or malformed websocket control messages are logged and ignored so protocol drift does not break the receive loop. Actual server error messages still reach client.register_on_error(callback).

`await client.speak(text, flush=True, allow_interruption=True)`

Sends text to be synthesized as speech.

Parameter	Type	Default	Purpose
`text`	`str`	-	Text to synthesize.
`flush`	`bool`	`True`	Clear TTS queue before speaking.
`allow_interruption`	`bool`	`True`	Allow speech to be interrupted.

Example:

await client.speak("Hello, world!")
await client.speak("Important message", flush=True, allow_interruption=False)

`await client.on_audio_input(audio_data)`

Sends raw audio data (bytes) to the server for speech recognition.

Example:

await client.on_audio_input(audio_bytes)

`await client.send_message(message, role, topic=None, debug=None)`

Sends a message to the Sayna session with role and optional metadata.

Parameter	Type	Default	Purpose
`message`	`str`	-	Message content.
`role`	`str`	-	Sender role (e.g., 'user', 'assistant').
`topic`	`str` (optional)	`None`	LiveKit topic/channel. Omitted when not provided.
`debug`	`dict` (optional)	`None`	Optional debug metadata.

`await client.clear()`

Clears the text-to-speech queue.

`await client.tts_flush(allow_interruption=True)`

Flushes the TTS queue by sending an empty speak command.

`await client.disconnect()`

Disconnects from the WebSocket server and cleans up resources.

Properties

client.ready: Boolean indicating whether the connection is ready (received ready message).
client.connected: Boolean indicating whether the WebSocket is connected.
client.livekit_room_name: LiveKit room name (available after ready when LiveKit is enabled).
client.livekit_url: LiveKit URL (available after ready).
client.sayna_participant_identity: Sayna participant identity (available after ready when LiveKit is enabled).
client.sayna_participant_name: Sayna participant name (available after ready when LiveKit is enabled).

Webhook Receiver

The WebhookReceiver class securely verifies and parses cryptographically signed webhooks from the Sayna SIP service.

Security Features

HMAC-SHA256 Signature Verification: Ensures webhook authenticity
Constant-Time Comparison: Prevents timing attack vulnerabilities
Replay Protection: 5-minute timestamp window prevents replay attacks
Strict Validation: Comprehensive checks on all required fields

`WebhookReceiver(secret=None)`

Creates a new webhook receiver instance.

Parameter	Type	Default	Purpose
`secret`	`str` (optional)	`None`	HMAC signing secret (min 16 chars). Falls back to `SAYNA_WEBHOOK_SECRET` env variable.

Example:

from sayna_client import WebhookReceiver

# Explicit secret
receiver = WebhookReceiver("your-secret-key-min-16-chars")

# Or from environment variable (SAYNA_WEBHOOK_SECRET)
receiver = WebhookReceiver()

`receiver.receive(headers, body)`

Verifies and parses an incoming SIP webhook.

Parameter	Type	Purpose
`headers`	`dict`	HTTP request headers (case-insensitive).
`body`	`str`	Raw request body as string (not parsed JSON).

Returns: WebhookSIPOutput - Validated webhook payload with fields:

participant: Object with identity, sid, and optional name
room: Object with name and sid
from_phone_number: Caller's phone number (E.164 format)
to_phone_number: Called phone number (E.164 format)
room_prefix: Room name prefix configured in Sayna
sip_host: SIP domain extracted from the To header
sip_headers: SIP headers from the incoming call (optional, dict[str, str] or None)

Raises: SaynaValidationError if signature verification fails or payload is invalid.

Flask Example

from flask import Flask, request, jsonify
from sayna_client import WebhookReceiver, SaynaValidationError

app = Flask(__name__)
receiver = WebhookReceiver("your-secret-key-min-16-chars")

@app.route("/webhook", methods=["POST"])
def webhook():
    try:
        # CRITICAL: Pass raw body, not parsed JSON
        body = request.get_data(as_text=True)
        webhook = receiver.receive(request.headers, body)

        print(f"From: {webhook.from_phone_number}")
        print(f"To: {webhook.to_phone_number}")
        print(f"Room: {webhook.room.name}")
        print(f"SIP Host: {webhook.sip_host}")
        print(f"Participant: {webhook.participant.identity}")

        return jsonify({"received": True}), 200
    except SaynaValidationError as error:
        print(f"Webhook verification failed: {error}")
        return jsonify({"error": "Invalid signature"}), 401

FastAPI Example

from fastapi import FastAPI, Request, HTTPException
from sayna_client import WebhookReceiver, SaynaValidationError

app = FastAPI()
receiver = WebhookReceiver()  # Uses SAYNA_WEBHOOK_SECRET env variable

@app.post("/webhook")
async def webhook(request: Request):
    try:
        body = await request.body()
        body_str = body.decode("utf-8")
        webhook = receiver.receive(dict(request.headers), body_str)

        # Process webhook...
        return {"received": True}
    except SaynaValidationError as error:
        raise HTTPException(status_code=401, detail=str(error))

Important Notes

Raw Body Required: You MUST pass the raw request body string, not the parsed JSON object. The signature is computed over the exact bytes received, so any formatting changes will cause verification to fail.
Case-Insensitive Headers: Header names are case-insensitive in HTTP. The receiver handles both X-Sayna-Signature and x-sayna-signature correctly.
Secret Security: Never commit secrets to version control. Use environment variables or a secret management system. Generate a secure secret with: openssl rand -hex 32

Development

Setup

# Create a virtual environment
python -m venv .venv

# Activate it
source .venv/bin/activate  # On Linux/macOS
# .venv\Scripts\activate  # On Windows

# Install development dependencies
pip install -e ".[dev]"

Tip: For faster dependency installation, you can use uv:
pip install uv
uv pip install -e ".[dev]"

Running Tests

# Run all tests
pytest

# Run with coverage
pytest --cov=sayna_client --cov-report=html

# Run specific test file
pytest tests/test_client.py

Type Checking

mypy src/sayna_client

Linting and Formatting

This project uses Ruff for linting and formatting:

# Check code
ruff check .

# Format code
ruff format .

# Fix auto-fixable issues
ruff check --fix .

Requirements

Python 3.9 or higher
aiohttp >= 3.9.0
pydantic >= 2.0.0

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Support

For issues and questions, please visit the GitHub Issues page.

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Sayna Python SDK

Features

Installation

Room Scoping

Quick Start

API

REST API Methods

await client.health()

await client.get_voices()

await client.speak_rest(text, tts_config)

await client.get_livekit_token(room_name, participant_name, participant_identity)

await client.get_sip_hooks()

await client.set_sip_hooks(hooks)

WebSocket API Methods

SaynaClient(url, stt_config, tts_config, livekit_config=None, without_audio=False, api_key=None)

await client.connect()

client.register_on_stt_result(callback)

client.register_on_tts_audio(callback)

client.register_on_error(callback)

client.register_on_message(callback)

client.register_on_participant_connected(callback)

client.register_on_participant_disconnected(callback)

client.register_on_track_subscribed(callback)

client.register_on_tts_playback_complete(callback)

await client.speak(text, flush=True, allow_interruption=True)

await client.on_audio_input(audio_data)

await client.send_message(message, role, topic=None, debug=None)

await client.clear()

await client.tts_flush(allow_interruption=True)

await client.disconnect()

Properties

Webhook Receiver

Security Features

WebhookReceiver(secret=None)

receiver.receive(headers, body)

Flask Example

FastAPI Example

Important Notes

Development

Setup

Running Tests

Type Checking

Linting and Formatting

Requirements

Contributing

Support

`await client.health()`

`await client.get_voices()`

`await client.speak_rest(text, tts_config)`

`await client.get_livekit_token(room_name, participant_name, participant_identity)`

`await client.get_sip_hooks()`

`await client.set_sip_hooks(hooks)`

`SaynaClient(url, stt_config, tts_config, livekit_config=None, without_audio=False, api_key=None)`

`await client.connect()`

`client.register_on_stt_result(callback)`

`client.register_on_tts_audio(callback)`

`client.register_on_error(callback)`

`client.register_on_message(callback)`

`client.register_on_participant_connected(callback)`

`client.register_on_participant_disconnected(callback)`

`client.register_on_track_subscribed(callback)`

`client.register_on_tts_playback_complete(callback)`

`await client.speak(text, flush=True, allow_interruption=True)`

`await client.on_audio_input(audio_data)`

`await client.send_message(message, role, topic=None, debug=None)`

`await client.clear()`

`await client.tts_flush(allow_interruption=True)`

`await client.disconnect()`

`WebhookReceiver(secret=None)`

`receiver.receive(headers, body)`