Controlling Genesys Cloud Voice Call Playback via API with Python

What You Will Build

A production-grade Python module that programmatically initiates, monitors, and controls audio playback on active Genesys Cloud voice conversations while synchronizing events with external billing systems. This tutorial uses the Genesys Cloud Conversation API, Event WebSockets, Webhook API, and Analytics API. The implementation covers Python 3.9+ with httpx for REST operations and websockets for real-time event streaming.

Prerequisites

• OAuth 2.0 Service Account with scopes: conversation:play, conversation:view, webhook:write, event:subscribe, analytics:query
• Python 3.9 or higher
• External dependencies: httpx, websockets, pydantic, aiofiles
• Environment variables: GENESYS_ENVIRONMENT, GENESYS_CLIENT_ID, GENESYS_CLIENT_SECRET
• SDK reference: PureCloudPlatformClientV2 from purecloud_platform_client (used conceptually for type mapping; this tutorial uses httpx for transparent payload construction)

Authentication Setup

Genesys Cloud uses OAuth 2.0 for API authentication. The following implementation fetches an access token, caches it, and implements exponential backoff for 429 rate-limit responses.

import os
import time
import httpx
from typing import Optional, Dict, Any
from functools import wraps

class GenesysAuth:
    def __init__(self, client_id: str, client_secret: str, environment: str):
        self.client_id = client_id
        self.client_secret = client_secret
        self.base_url = f"https://{environment}.mypurecloud.com"
        self.token_url = f"{self.base_url}/oauth/token"
        self._token: Optional[str] = None
        self._expires_at: float = 0.0
        self._http_client = httpx.Client(timeout=30.0)

    def get_token(self) -> str:
        if self._token and time.time() < self._expires_at:
            return self._token
        
        payload = {
            "grant_type": "client_credentials",
            "client_id": self.client_id,
            "client_secret": self.client_secret,
            "scope": "conversation:play conversation:view webhook:write event:subscribe analytics:query"
        }
        
        response = self._http_client.post(self.token_url, data=payload)
        response.raise_for_status()
        data = response.json()
        
        self._token = data["access_token"]
        self._expires_at = time.time() + data["expires_in"] - 60  # Buffer for expiration
        return self._token

    def close(self):
        self._http_client.close()

def retry_on_rate_limit(max_retries: int = 3, base_delay: float = 1.0):
    def decorator(func):
        @wraps(func)
        async def wrapper(*args, **kwargs):
            last_exception = None
            for attempt in range(max_retries):
                try:
                    return await func(*args, **kwargs)
                except httpx.HTTPStatusError as e:
                    if e.response.status_code == 429:
                        delay = base_delay * (2 ** attempt)
                        print(f"Rate limited (429). Retrying in {delay}s...")
                        await asyncio.sleep(delay)
                        last_exception = e
                    else:
                        raise
            raise last_exception
        return wrapper
    return decorator

import asyncio

Implementation

Step 1: Validate Media Format and Endpoint Capabilities

Genesys Cloud enforces strict codec and latency requirements for playback URLs. The platform supports G.711 (ulaw/alaw), G.729, Opus, MP3, and WAV. URLs must be publicly accessible or hosted on Genesys Cloud storage. The following function validates the media URL against supported formats and checks conversation capabilities before initiating playback.

import mimetypes
import re
from httpx import AsyncClient

SUPPORTED_EXTENSIONS = {".wav", ".mp3", ".ogg", ".g711", ".g729", ".opus"}

def validate_media_url(url: str) -> Dict[str, Any]:
    parsed = re.search(r'\.([a-zA-Z0-9]+)$', url)
    ext = f".{parsed.group(1).lower()}" if parsed else ""
    
    if ext not in SUPPORTED_EXTENSIONS:
        raise ValueError(f"Unsupported media format: {ext}. Genesys Cloud requires .wav, .mp3, .ogg, .g711, .g729, or .opus")
    
    content_type, _ = mimetypes.guess_type(url)
    latency_check = "https://" in url or "http://" in url
    if not latency_check:
        raise ValueError("Playback URL must be publicly accessible via HTTP/HTTPS to meet latency constraints")
        
    return {
        "url": url,
        "format": ext,
        "content_type": content_type,
        "latency_compliant": True
    }

async def check_conversation_capabilities(client: AsyncClient, conversation_id: str, token: str) -> Dict[str, Any]:
    # Scope: conversation:view
    headers = {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}
    response = await client.get(
        f"https://{os.getenv('GENESYS_ENVIRONMENT')}.mypurecloud.com/api/v2/conversations/voice/{conversation_id}",
        headers=headers
    )
    response.raise_for_status()
    data = response.json()
    
    if data.get("state") != "connected":
        raise RuntimeError(f"Conversation {conversation_id} is not in 'connected' state. Current: {data.get('state')}")
        
    return data

Step 2: Construct and Send Playback Control Payloads

The Conversation API accepts playback actions via a dedicated endpoint. The payload requires a play object containing the media URL, loop configuration, and optional maximum duration. The following implementation constructs the payload, sends it, and handles common HTTP errors.

@retry_on_rate_limit()
async def initiate_playback(client: AsyncClient, conversation_id: str, media_url: str, loop: bool = False, max_duration: int = 30, token: str = "") -> Dict[str, Any]:
    # Scope: conversation:play
    base_url = f"https://{os.getenv('GENESYS_ENVIRONMENT')}.mypurecloud.com"
    headers = {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}
    
    payload = {
        "play": {
            "url": media_url,
            "loop": loop,
            "maxDuration": max_duration
        }
    }
    
    response = await client.post(
        f"{base_url}/api/v2/conversations/voice/{conversation_id}/actions/play",
        headers=headers,
        json=payload
    )
    
    if response.status_code == 400:
        print(f"Bad Request: {response.json().get('errors', [])}")
        raise ValueError("Invalid playback payload or unsupported media format")
    elif response.status_code == 403:
        raise PermissionError("Missing conversation:play scope or insufficient permissions")
    elif response.status_code == 404:
        raise LookupError(f"Conversation {conversation_id} not found")
        
    response.raise_for_status()
    return response.json()

Step 3: Handle Asynchronous Playback Status via WebSocket Subscriptions

Genesys Cloud streams playback state changes through the Event WebSocket. The subscription message targets conversation:voice:playback events. The following handler parses real-time progress, tracks completion, and manages reconnection logic.

import websockets
import json
from datetime import datetime

class PlaybackEventTracker:
    def __init__(self, environment: str, token: str):
        self.environment = environment
        self.token = token
        self.ws_url = f"wss://{environment}.mypurecloud.com/api/v2/events"
        self.events: Dict[str, Any] = {}
        self.completion_rates: Dict[str, float] = {}

    async def subscribe(self, conversation_id: str):
        # Scope: event:subscribe
        async with websockets.connect(self.ws_url, additional_headers={"Authorization": f"Bearer {self.token}"}) as ws:
            subscription = {
                "subscriptions": [
                    {
                        "event": "conversation:voice:playback",
                        "filter": {"conversationId": conversation_id}
                    }
                ]
            }
            await ws.send(json.dumps(subscription))
            
            while True:
                message = await ws.recv()
                event = json.loads(message)
                
                if event.get("eventType") == "conversation:voice:playback":
                    await self.process_event(event)
                    
                if event.get("eventType") == "conversation:voice:playback" and event.get("state") == "completed":
                    self.completion_rates[conversation_id] = 1.0
                    break

    async def process_event(self, event: Dict[str, Any]):
        playback_id = event.get("playbackId")
        state = event.get("state")
        duration_ms = event.get("duration", 0)
        
        self.events[playback_id] = {
            "timestamp": datetime.utcnow().isoformat(),
            "state": state,
            "duration_ms": duration_ms
        }
        print(f"Playback {playback_id} -> {state} ({duration_ms}ms)")

Step 4: Implement Dynamic Media Switching Logic

Dynamic switching requires intercepting user input events (DTMF or speech recognition) and triggering a sequence of stop and play actions. The following logic monitors incoming events and switches media based on predefined triggers.

async def handle_dynamic_switch(client: AsyncClient, conversation_id: str, input_event: Dict[str, Any], token: str) -> None:
    # Scope: conversation:play
    base_url = f"https://{os.getenv('GENESYS_ENVIRONMENT')}.mypurecloud.com"
    headers = {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}
    
    dtmf_digit = input_event.get("dtmf", {}).get("digit")
    speech_text = input_event.get("speechRecognition", {}).get("text", "").lower()
    
    target_url = None
    if dtmf_digit == "1":
        target_url = "https://example.com/promo_audio.wav"
    elif "cancel" in speech_text:
        target_url = "https://example.com/cancellation_flow.wav"
        
    if target_url:
        # Stop current playback
        await client.post(
            f"{base_url}/api/v2/conversations/voice/{conversation_id}/actions/play/stop",
            headers=headers
        )
        
        # Initiate new playback
        await initiate_playback(client, conversation_id, target_url, loop=False, max_duration=45, token=token)
        print(f"Switched playback to {target_url} based on input: {dtmf_digit or speech_text}")

Step 5: Synchronize Events with External Billing via Webhooks

Genesys Cloud webhooks route playback events to external endpoints. The following code registers a webhook for billing synchronization and implements a local audit logger for compliance reporting.

import aiofiles

@retry_on_rate_limit()
async def register_billing_webhook(client: AsyncClient, webhook_url: str, token: str) -> Dict[str, Any]:
    # Scope: webhook:write
    base_url = f"https://{os.getenv('GENESYS_ENVIRONMENT')}.mypurecloud.com"
    headers = {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}
    
    payload = {
        "name": "PlaybackBillingSync",
        "eventFilters": ["conversation:voice:playback"],
        "address": webhook_url,
        "method": "POST",
        "enabled": True,
        "authScheme": "basic",
        "authUsername": "billing_user",
        "authPassword": "billing_secret"
    }
    
    response = await client.post(f"{base_url}/api/v2/webhooks", headers=headers, json=payload)
    response.raise_for_status()
    return response.json()

async def write_audit_log(conversation_id: str, playback_id: str, state: str, duration_ms: int):
    timestamp = datetime.utcnow().isoformat()
    log_entry = f"{timestamp},{conversation_id},{playback_id},{state},{duration_ms}\n"
    
    async with aiofiles.open("playback_audit.csv", mode="a") as f:
        await f.write(log_entry)

Step 6: Track Playback Completion Rates via Analytics

Historical completion rates require querying the Analytics API. The following implementation constructs a time-bounded query, handles pagination, and aggregates playback metrics.

@retry_on_rate_limit()
async def query_playback_analytics(client: AsyncClient, start_time: str, end_time: str, token: str) -> Dict[str, Any]:
    # Scope: analytics:query
    base_url = f"https://{os.getenv('GENESYS_ENVIRONMENT')}.mypurecloud.com"
    headers = {"Authorization": f"Bearer {token}", "Content-Type": "application/json"}
    
    payload = {
        "query": {
            "interval": f"{start_time}/{end_time}",
            "view": "conv",
            "groupBy": ["conversationId"],
            "select": ["conversationId", "playbackDuration", "playbackCount", "playbackCompletionRate"],
            "filter": {
                "type": "conversation",
                "subType": "voice"
            }
        }
    }
    
    response = await client.post(
        f"{base_url}/api/v2/analytics/conversations/details/query",
        headers=headers,
        json=payload
    )
    response.raise_for_status()
    
    data = response.json()
    total_playbacks = sum(item.get("playbackCount", 0) for item in data.get("results", []))
    completed = sum(item.get("playbackCompletionRate", 0) * item.get("playbackCount", 0) for item in data.get("results", []))
    
    return {
        "total_playbacks": total_playbacks,
        "completion_rate": completed / total_playbacks if total_playbacks > 0 else 0.0,
        "raw_results": data.get("results", [])
    }

Complete Working Example

The following script integrates all components into a single executable controller. It initializes authentication, validates media, starts playback, subscribes to WebSocket events, handles dynamic switching, registers webhooks, and queries analytics.

import asyncio
import os
import httpx
import websockets
import json
from datetime import datetime, timedelta

async def main():
    env = os.getenv("GENESYS_ENVIRONMENT")
    client_id = os.getenv("GENESYS_CLIENT_ID")
    client_secret = os.getenv("GENESYS_CLIENT_SECRET")
    conversation_id = os.getenv("GENESYS_CONVERSATION_ID")
    
    if not all([env, client_id, client_secret, conversation_id]):
        raise EnvironmentError("Missing required environment variables")
        
    auth = GenesysAuth(client_id, client_secret, env)
    token = auth.get_token()
    async with httpx.AsyncClient(timeout=30.0) as client:
        try:
            # Step 1: Validate media and conversation
            media_url = "https://example.com/welcome_message.wav"
            validation = validate_media_url(media_url)
            await check_conversation_capabilities(client, conversation_id, token)
            print(f"Media validated: {validation}")
            
            # Step 2: Initiate playback
            print("Starting playback...")
            await initiate_playback(client, conversation_id, media_url, loop=False, max_duration=30, token=token)
            
            # Step 3: Subscribe to events
            tracker = PlaybackEventTracker(env, token)
            await tracker.subscribe(conversation_id)
            
            # Step 5: Register webhook for billing sync
            webhook_url = "https://your-billing-system.example.com/webhooks/genesys"
            await register_billing_webhook(client, webhook_url, token)
            print("Billing webhook registered")
            
            # Step 6: Query analytics
            end_time = datetime.utcnow().isoformat()
            start_time = (datetime.utcnow() - timedelta(hours=1)).isoformat()
            analytics = await query_playback_analytics(client, start_time, end_time, token)
            print(f"Analytics: {analytics}")
            
        except Exception as e:
            print(f"Execution failed: {e}")
        finally:
            auth.close()

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

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: The OAuth token has expired or was not included in the Authorization header.
• Fix: Implement token refresh logic before each request. The GenesysAuth class caches tokens and validates expiration timestamps automatically.
• Code Fix: Ensure headers = {"Authorization": f"Bearer {token}"} is passed to every httpx call.

Error: 403 Forbidden

• Cause: The service account lacks the required OAuth scope for the specific endpoint.
• Fix: Verify the client credentials possess conversation:play, event:subscribe, or webhook:write depending on the failing call.
• Code Fix: Update the scope parameter in the get_token method to include missing permissions.

Error: 400 Bad Request

• Cause: Invalid playback payload structure, unsupported media codec, or malformed URL.
• Fix: Validate the URL against Genesys supported formats before submission. Ensure maxDuration is an integer and loop is a boolean.
• Code Fix: Use the validate_media_url function to catch format mismatches prior to API submission.

Error: 429 Too Many Requests

• Cause: Exceeding Genesys Cloud API rate limits.
• Fix: Implement exponential backoff retry logic. The @retry_on_rate_limit decorator handles automatic retries with increasing delays.
• Code Fix: Wrap all async HTTP calls with the decorator. Monitor Retry-After headers if custom backoff is required.

Error: WebSocket Connection Reset

• Cause: Token expiration during long-running WebSocket sessions or network instability.
• Fix: Re-establish the WebSocket connection with a fresh token when disconnected. Implement heartbeat messages to keep the connection alive.
• Code Fix: Add ping_interval=20 and ping_timeout=10 to websockets.connect(). Catch websockets.exceptions.ConnectionClosed and trigger reauthentication.

Official References

• Conversation Play Action API
• Event WebSockets Subscription
• Webhook API
• Analytics Conversations Query
• PureCloudPlatformClientV2 Python SDK