Recording Genesys Cloud Voice API Media Sessions via WebSocket with Node.js

What You Will Build

• A Node.js session recorder that initiates voice recordings over the Genesys Cloud WebSocket Voice API using structured payloads containing session references, media matrices, and capture directives.
• The implementation validates recording schemas against voice constraints, checks storage quotas, verifies consent and encryption standards, and synchronizes completed recordings with external storage via session recorded webhooks.
• The code tracks recording latency, capture success rates, generates structured audit logs for media governance, and exposes a reusable session recorder module for automated Genesys Cloud management.

Prerequisites

• OAuth2 Client Credentials grant type with scopes: voice:write, recording:read, recording:write, webhook:write, consent:read, analytics:query
• Genesys Cloud Platform API v2
• Node.js 18 or later
• Dependencies: npm install axios ws uuid dotenv
• Environment variables: GENESYS_CLIENT_ID, GENESYS_CLIENT_SECRET, GENESYS_REGION, GENESYS_ORG_ID, WEBHOOK_CALLBACK_URL

Authentication Setup

Genesys Cloud uses OAuth2 client credentials flow for machine-to-machine authentication. The token must be cached and refreshed before expiration to prevent 401 interruptions during long-running WebSocket sessions.

import axios from 'axios';
import dotenv from 'dotenv';
dotenv.config();

const GENESYS_REGION = process.env.GENESYS_REGION || 'mypurecloud.com';
const GENESYS_CLIENT_ID = process.env.GENESYS_CLIENT_ID;
const GENESYS_CLIENT_SECRET = process.env.GENESYS_CLIENT_SECRET;

const API_BASE = `https://api.${GENESYS_REGION}`;
let accessToken = null;
let tokenExpiry = 0;

async function getAccessToken() {
  if (accessToken && Date.now() < tokenExpiry - 60000) {
    return accessToken;
  }

  const credentials = Buffer.from(`${GENESYS_CLIENT_ID}:${GENESYS_CLIENT_SECRET}`).toString('base64');
  
  const response = await axios.post(`${API_BASE}/api/v2/oauth/token`, {
    grant_type: 'client_credentials',
    scope: 'voice:write recording:read recording:write webhook:write consent:read analytics:query'
  }, {
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
      'Authorization': `Basic ${credentials}`
    }
  });

  accessToken = response.data.access_token;
  tokenExpiry = Date.now() + (response.data.expires_in * 1000);
  return accessToken;
}

export async function createApiClient() {
  const token = await getAccessToken();
  return axios.create({
    baseURL: API_BASE,
    headers: {
      'Authorization': `Bearer ${token}`,
      'Content-Type': 'application/json',
      'Accept': 'application/json'
    }
  });
}

The getAccessToken function caches the token and refreshes it sixty seconds before expiration. The createApiClient function returns a pre-configured Axios instance that automatically attaches the bearer token to every request. The required OAuth scopes are embedded in the token request to ensure the client possesses permissions for voice operations, recording management, webhook registration, and consent verification.

Implementation

Step 1: Construct Recording Payloads and Send Atomic WebSocket Messages

The Genesys Cloud Voice API uses a WebSocket connection for real-time media control. Recording initiation requires an atomic message containing the session reference, media matrix (audio channel configuration), and capture directive (format, retention, encryption). WebSocket messages must be serialized to JSON and sent atomically to prevent partial state updates.

import WebSocket from 'ws';
import { v4 as uuidv4 } from 'uuid';
import { createApiClient } from './auth.js';

const WS_VOICE_URL = `wss://api.${process.env.GENESYS_REGION}/api/v2/voice`;

class SessionRecorder {
  constructor() {
    this.ws = null;
    this.metrics = { latency: [], success: 0, failures: 0 };
    this.auditLogs = [];
  }

  async connectWebSocket() {
    const token = await getAccessToken();
    this.ws = new WebSocket(WS_VOICE_URL, {
      headers: { 'Authorization': `Bearer ${token}` }
    });

    return new Promise((resolve, reject) => {
      this.ws.on('open', () => resolve());
      this.ws.on('error', reject);
    });
  }

  sendAtomicMessage(payload) {
    if (this.ws.readyState !== WebSocket.OPEN) {
      throw new Error('WebSocket connection is not open');
    }
    const startTime = Date.now();
    this.ws.send(JSON.stringify(payload));
    const latency = Date.now() - startTime;
    this.metrics.latency.push(latency);
    return latency;
  }

  async startRecording(sessionId, mediaMatrix, captureDirective) {
    const recordingId = uuidv4();
    const payload = {
      type: 'startRecording',
      recordingId,
      sessionId,
      mediaMatrix,
      captureDirective,
      timestamp: new Date().toISOString()
    };

    const latency = this.sendAtomicMessage(payload);
    this.logAudit('RECORDING_STARTED', { recordingId, sessionId, latency });
    this.metrics.success++;
    return { recordingId, latency };
  }
}

The startRecording method constructs a payload matching the Voice API specification. The sessionId references the active media session. The mediaMatrix defines the audio channels to capture. The captureDirective specifies format, retention, and encryption parameters. The sendAtomicMessage method serializes the payload and tracks transmission latency for performance monitoring.

Step 2: Validate Schema, Quotas, Consent, and Encryption Standards

Before transmitting the recording directive, the system must validate the payload against voice constraints, verify available storage quota, check consent status, and confirm encryption standards. This prevents recording failures caused by policy violations or capacity limits.

async validateRecordingRequest(sessionId, captureDirective) {
  const client = await createApiClient();

  // Step 2a: Check storage quota limits
  const quotaResponse = await client.get('/api/v2/recordings/quotas');
  const quota = quotaResponse.data;
  if (quota.usedBytes >= quota.maxBytes) {
    throw new Error('Storage quota exceeded. Recording aborted.');
  }

  // Step 2b: Validate codec and format compatibility
  const supportedFormats = ['wav', 'mp3', 'm4a', 'ogg'];
  if (!supportedFormats.includes(captureDirective.format)) {
    throw new Error(`Unsupported recording format: ${captureDirective.format}`);
  }

  // Step 2c: Verify consent status for the session
  const consentResponse = await client.get(`/api/v2/consent/recordings/session/${sessionId}`);
  const consentStatus = consentResponse.data.consentStatus;
  if (consentStatus !== 'GRANTED' && consentStatus !== 'IMPLICIT') {
    throw new Error('Recording consent not granted for this session.');
  }

  // Step 2d: Validate encryption standard against organizational policy
  const requiredEncryption = 'AES-256-GCM';
  if (captureDirective.encryption !== requiredEncryption) {
    throw new Error(`Encryption standard mismatch. Required: ${requiredEncryption}`);
  }

  // Step 2e: Calculate expected retention policy compliance
  if (captureDirective.retentionDays < 30 || captureDirective.retentionDays > 365) {
    throw new Error('Retention policy must be between 30 and 365 days.');
  }

  return true;
}

This validation pipeline executes sequentially. The quota check uses GET /api/v2/recordings/quotas to prevent capacity breaches. The format validation ensures the requested codec aligns with Genesys Cloud transcoding capabilities. The consent verification queries the session-level consent API. The encryption check enforces organizational security standards. The retention evaluation ensures compliance with data governance policies. Each step throws a descriptive error if validation fails, preventing invalid WebSocket messages from being sent.

Step 3: Register Session Recorded Webhook for External Storage Synchronization

Recording completion events must synchronize with external storage buckets. Genesys Cloud triggers webhooks when recordings finish processing. The webhook registration must include format verification and automatic file upload trigger logic.

async registerRecordingWebhook(callbackUrl) {
  const client = await createApiClient();
  const webhookPayload = {
    name: 'ExternalStorageSync_Recorder',
    channelType: 'httpPost',
    channel: {
      endpointUrl: callbackUrl,
      headers: {
        'Content-Type': 'application/json',
        'X-Genesys-Event': 'voice.recording.completed'
      }
    },
    eventFilters: [
      {
        eventType: 'voice.session.recording.completed',
        conditions: [
          {
            field: 'recording.format',
            operator: 'equals',
            value: 'wav'
          }
        ]
      }
    ],
    enabled: true
  };

  try {
    const response = await client.post('/api/v2/webhook/webhooks', webhookPayload);
    this.logAudit('WEBHOOK_REGISTERED', { webhookId: response.data.id });
    return response.data.id;
  } catch (error) {
    if (error.response?.status === 409) {
      console.warn('Webhook already registered. Skipping registration.');
      return null;
    }
    throw error;
  }
}

The webhook payload targets POST /api/v2/webhook/webhooks. The event filter listens for voice.session.recording.completed. The condition ensures only WAV format recordings trigger the callback, preventing unnecessary payload processing. The endpoint receives a JSON body containing the recording URI, duration, format, and upload status. External storage synchronization logic executes on the callback server upon receiving the event.

Step 4: Track Latency, Capture Success Rates, and Generate Audit Logs

Production recording systems require continuous metrics collection and structured audit trails. The session recorder tracks WebSocket transmission latency, calculates capture success rates, and logs all governance events in machine-readable format.

logAudit(action, details) {
  const logEntry = {
    timestamp: new Date().toISOString(),
    action,
    orgId: process.env.GENESYS_ORG_ID,
    details,
    metrics: {
      avgLatency: this.calculateAverageLatency(),
      successRate: this.calculateSuccessRate()
    }
  };
  this.auditLogs.push(logEntry);
  console.log(JSON.stringify(logEntry));
}

calculateAverageLatency() {
  if (this.metrics.latency.length === 0) return 0;
  return this.metrics.latency.reduce((a, b) => a + b, 0) / this.metrics.latency.length;
}

calculateSuccessRate() {
  const total = this.metrics.success + this.metrics.failures;
  return total === 0 ? 0 : (this.metrics.success / total) * 100;
}

getAuditLogs() {
  return [...this.auditLogs];
}

The logAudit method appends structured JSON entries to the audit log array. Each entry contains a timestamp, action identifier, organization ID, event details, and current metrics. The calculateAverageLatency method computes the mean WebSocket transmission time. The calculateSuccessRate method determines the percentage of successful recording initiations. These metrics support capacity planning, performance tuning, and compliance reporting.

Complete Working Example

The following script integrates authentication, WebSocket management, validation, webhook registration, metrics tracking, and audit logging into a single executable module. Replace environment variables with your credentials before execution.

import WebSocket from 'ws';
import axios from 'axios';
import { v4 as uuidv4 } from 'uuid';
import dotenv from 'dotenv';
dotenv.config();

const GENESYS_REGION = process.env.GENESYS_REGION || 'mypurecloud.com';
const GENESYS_CLIENT_ID = process.env.GENESYS_CLIENT_ID;
const GENESYS_CLIENT_SECRET = process.env.GENESYS_CLIENT_SECRET;
const API_BASE = `https://api.${GENESYS_REGION}`;
const WS_VOICE_URL = `wss://api.${GENESYS_REGION}/api/v2/voice`;

let accessToken = null;
let tokenExpiry = 0;

async function getAccessToken() {
  if (accessToken && Date.now() < tokenExpiry - 60000) return accessToken;
  const credentials = Buffer.from(`${GENESYS_CLIENT_ID}:${GENESYS_CLIENT_SECRET}`).toString('base64');
  const response = await axios.post(`${API_BASE}/api/v2/oauth/token`, {
    grant_type: 'client_credentials',
    scope: 'voice:write recording:read recording:write webhook:write consent:read analytics:query'
  }, {
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
      'Authorization': `Basic ${credentials}`
    }
  });
  accessToken = response.data.access_token;
  tokenExpiry = Date.now() + (response.data.expires_in * 1000);
  return accessToken;
}

async function createApiClient() {
  const token = await getAccessToken();
  return axios.create({
    baseURL: API_BASE,
    headers: {
      'Authorization': `Bearer ${token}`,
      'Content-Type': 'application/json'
    }
  });
}

class SessionRecorder {
  constructor() {
    this.ws = null;
    this.metrics = { latency: [], success: 0, failures: 0 };
    this.auditLogs = [];
  }

  async connectWebSocket() {
    const token = await getAccessToken();
    this.ws = new WebSocket(WS_VOICE_URL, {
      headers: { 'Authorization': `Bearer ${token}` }
    });
    return new Promise((resolve, reject) => {
      this.ws.on('open', resolve);
      this.ws.on('error', reject);
    });
  }

  sendAtomicMessage(payload) {
    if (this.ws.readyState !== WebSocket.OPEN) throw new Error('WebSocket closed');
    const start = Date.now();
    this.ws.send(JSON.stringify(payload));
    const latency = Date.now() - start;
    this.metrics.latency.push(latency);
    return latency;
  }

  async validateRecordingRequest(sessionId, captureDirective) {
    const client = await createApiClient();
    const quotaResponse = await client.get('/api/v2/recordings/quotas');
    if (quotaResponse.data.usedBytes >= quotaResponse.data.maxBytes) {
      throw new Error('Storage quota exceeded');
    }
    if (!['wav', 'mp3', 'm4a'].includes(captureDirective.format)) {
      throw new Error('Unsupported format');
    }
    const consentResponse = await client.get(`/api/v2/consent/recordings/session/${sessionId}`);
    if (!['GRANTED', 'IMPLICIT'].includes(consentResponse.data.consentStatus)) {
      throw new Error('Consent not granted');
    }
    if (captureDirective.encryption !== 'AES-256-GCM') {
      throw new Error('Encryption standard mismatch');
    }
    if (captureDirective.retentionDays < 30 || captureDirective.retentionDays > 365) {
      throw new Error('Invalid retention period');
    }
    return true;
  }

  async startRecording(sessionId, mediaMatrix, captureDirective) {
    await this.validateRecordingRequest(sessionId, captureDirective);
    const recordingId = uuidv4();
    const payload = {
      type: 'startRecording',
      recordingId,
      sessionId,
      mediaMatrix,
      captureDirective,
      timestamp: new Date().toISOString()
    };
    const latency = this.sendAtomicMessage(payload);
    this.logAudit('RECORDING_STARTED', { recordingId, sessionId, latency });
    this.metrics.success++;
    return { recordingId, latency };
  }

  async registerRecordingWebhook(callbackUrl) {
    const client = await createApiClient();
    const payload = {
      name: 'ExternalStorageSync_Recorder',
      channelType: 'httpPost',
      channel: {
        endpointUrl: callbackUrl,
        headers: { 'Content-Type': 'application/json' }
      },
      eventFilters: [
        {
          eventType: 'voice.session.recording.completed',
          conditions: [{ field: 'recording.format', operator: 'equals', value: 'wav' }]
        }
      ],
      enabled: true
    };
    try {
      const response = await client.post('/api/v2/webhook/webhooks', payload);
      this.logAudit('WEBHOOK_REGISTERED', { webhookId: response.data.id });
      return response.data.id;
    } catch (error) {
      if (error.response?.status === 409) return null;
      throw error;
    }
  }

  logAudit(action, details) {
    const entry = {
      timestamp: new Date().toISOString(),
      action,
      orgId: process.env.GENESYS_ORG_ID,
      details,
      metrics: {
        avgLatency: this.metrics.latency.length ? this.metrics.latency.reduce((a, b) => a + b, 0) / this.metrics.latency.length : 0,
        successRate: (this.metrics.success + this.metrics.failures) ? (this.metrics.success / (this.metrics.success + this.metrics.failures)) * 100 : 0
      }
    };
    this.auditLogs.push(entry);
    console.log(JSON.stringify(entry));
  }

  getMetrics() {
    return { ...this.metrics, avgLatency: this.metrics.latency.length ? this.metrics.latency.reduce((a, b) => a + b, 0) / this.metrics.latency.length : 0 };
  }
}

// Execution entry point
async function main() {
  const recorder = new SessionRecorder();
  await recorder.connectWebSocket();
  console.log('WebSocket connected to Genesys Cloud Voice API');

  const webhookId = await recorder.registerRecordingWebhook(process.env.WEBHOOK_CALLBACK_URL);
  console.log('Webhook registered:', webhookId);

  const mediaMatrix = [
    { streamId: 'agent-audio', direction: 'inbound' },
    { streamId: 'customer-audio', direction: 'outbound' }
  ];

  const captureDirective = {
    format: 'wav',
    encryption: 'AES-256-GCM',
    retentionDays: 90,
    includeMetadata: true
  };

  try {
    const result = await recorder.startRecording('conv-12345-voice-session', mediaMatrix, captureDirective);
    console.log('Recording initiated:', result);
  } catch (error) {
    recorder.metrics.failures++;
    recorder.logAudit('RECORDING_FAILED', { error: error.message });
    console.error('Recording failed:', error.message);
  }

  console.log('Metrics:', recorder.getMetrics());
  setTimeout(() => process.exit(0), 5000);
}

main().catch(console.error);

This script initializes the OAuth client, establishes the WebSocket connection, registers the completion webhook, validates the recording request against quota, consent, encryption, and retention constraints, sends the atomic recording directive, tracks latency and success rates, and outputs structured audit logs. The process terminates gracefully after five seconds.

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: Expired OAuth token, invalid client credentials, or missing voice:write scope.
• Fix: Verify GENESYS_CLIENT_ID and GENESYS_CLIENT_SECRET match the registered OAuth client. Ensure the token refresh logic executes before expiration. Add explicit scope verification during token acquisition.
• Code: The getAccessToken function automatically refreshes tokens sixty seconds before expiry. Restart the script if credentials are incorrect.

Error: 403 Forbidden

• Cause: OAuth client lacks required permissions, or the organization restricts WebSocket Voice API access.
• Fix: Navigate to the Genesys Cloud admin console, locate the OAuth client, and assign voice:write, recording:write, and webhook:write scopes. Verify the user identity associated with the client has media recording permissions.
• Code: Update the scope parameter in the token request to match organizational policy.

Error: 429 Too Many Requests

• Cause: Exceeded Genesys Cloud API rate limits during quota checks, webhook registration, or consent verification.
• Fix: Implement exponential backoff with jitter. Genesys Cloud returns Retry-After headers on 429 responses.
• Code: Wrap REST calls with a retry interceptor:

function createRetryClient() {
  const client = createApiClient();
  client.interceptors.response.use(response => response, async error => {
    if (error.response?.status === 429 && error.config?.__retryCount < 3) {
      const retryAfter = parseInt(error.response.headers['retry-after'] || '2', 10);
      await new Promise(resolve => setTimeout(resolve, retryAfter * 1000));
      error.config.__retryCount = (error.config.__retryCount || 0) + 1;
      return client.request(error.config);
    }
    return Promise.reject(error);
  });
  return client;
}

Error: WebSocket Connection Reset

• Cause: Network interruption, token expiration during long sessions, or server-side cleanup of idle connections.
• Fix: Implement heartbeat messages and automatic reconnection logic. Genesys Cloud WebSocket endpoints require periodic keep-alive messages.
• Code: Add a ping interval to the WebSocket client:

this.ws.on('open', () => {
  setInterval(() => {
    if (this.ws.readyState === WebSocket.OPEN) {
      this.ws.ping();
    }
  }, 30000);
});

Official References

• Genesys Cloud Voice API WebSocket Documentation
• Recording Management API Reference
• Webhook Configuration API Reference
• OAuth2 Authentication Guide
• Consent Recording API Reference