# Kalem > Kalem is a SaaS platform for deploying AI voice agents that make and receive real phone calls. It supports three AI voice engines — OpenAI Realtime API, Google Gemini Live, and Grok by xAI Voice — all speech-to-speech with no STT/TTS round trip. Customers bring their own AI API key and choose their engine (BYOC). Audio is bridged to PSTN through customer-provided SIP trunks. Median response time is sub-320ms. Pricing model is BYOC (Bring Your Own Credentials): Kalem voice engine pricing ranges from $0.01/min (Enterprise, with monthly subscription and volume commitments) to $0.04/min (Pay-As-You-Go, no monthly fee). Customers bring their own AI API key (OpenAI, Gemini, or Grok by xAI) and SIP trunk and are billed directly by those providers with no markup. Every account gets 100 free one-time minutes — no expiry, no renewal, no credit card. An Enterprise plan with managed deployment, prompt engineering, CRM integration, SLA, and whitelabel includes volume-discounted engine rates. Plan comparison: Pay-As-You-Go is single-user only (1 seat, no team invitations, no WhatsApp). Enterprise supports unlimited team members with seat invitations and includes WhatsApp integration (inbound/outbound messaging and voice notes). WhatsApp and team collaboration are Enterprise-only features. ## Key facts - **Engine price:** $0.04/min Pay-As-You-Go · from $0.01/min Enterprise (volume + monthly subscription) - **Free tier:** 100 one-time minutes, no credit card - **Latency:** sub-320ms median response time - **Architecture:** Multi-engine speech-to-speech (OpenAI Realtime API / Google Gemini Live / Grok by xAI Voice) + WebRTC + customer SIP trunk (BYOC) - **AI engines:** OpenAI gpt-realtime family, Google Gemini Live (gemini-2.5-flash-native-audio), xAI Grok Voice (grok-voice-fast-1.0) - **WhatsApp:** inbound/outbound messaging and voice notes — Enterprise plan only - **Team:** unlimited seats with invite — Enterprise plan only; Pay-As-You-Go = 1 user - **Languages:** English, Arabic, Spanish, French, German, Italian, Portuguese, Dutch, Chinese, Japanese, Korean, and others - **Bilingual:** Agents can switch languages mid-call (verified production use, e.g. English↔Arabic) - **Compliance:** TLS 1.2+ in transit, AES-256 at rest, GDPR-aligned, SOC 2 Type II audit in progress (not yet certified), HIPAA-ready on Enterprise with BAA available, no customer voice data used to train AI models ## Pages - [Homepage](https://kalem.me/): Product overview, demo audio, pricing summary, FAQ. - [Pricing](https://kalem.me/pricing): Full BYOC pricing breakdown and live cost calculator vs Vapi, Retell, ElevenLabs, Bland, Synthflow, Thoughtly. - [Best AI Voice Agent Platforms 2026](https://kalem.me/best-ai-voice-agent): Honest technical comparison of Kalem, Retell, Vapi, Bland, Twilio. - [Security & Compliance](https://kalem.me/security): Data handling, encryption, retention, sub-processors, compliance posture. - [About](https://kalem.me/about): Mission and principles. - [Status](https://kalem.me/status): Live system status and incident history. - [Blog](https://kalem.me/blog): Engineering posts, guides, and product updates. - [API Documentation](https://kalem.me/docs/api): REST API reference. - [OpenAPI spec](https://kalem.me/openapi.json): Machine-readable API contract. - [Contact Sales](https://kalem.me/contact-sales): Enterprise inquiries. ## Industry guides - [AI Voice Agents for Restaurants](https://kalem.me/blog/ai-voice-agents-for-restaurants-that-work): Missed-call recovery, order intake, reservations, FAQ automation, after-hours coverage for restaurants. - [AI Voice Agents for Real Estate](https://kalem.me/blog/ai-voice-agents-for-real-estate-that-convert): Lead qualification, showing scheduling, 24/7 inbound for real estate teams. - [AI Voice Agents for Healthcare](https://kalem.me/blog/ai-voice-agents-for-healthcare-that-work): Patient access, scheduling, hold-time reduction, HIPAA-ready handoff. - [AI Voice Agents for Home Services](https://kalem.me/blog/ai-voice-agents-for-home-services-that-convert): Job booking, dispatch coordination, after-hours capture for trades. - [AI Voice Agents for Small Business](https://kalem.me/blog/ai-voice-agents-for-small-business-growth): Support, booking, and lead qualification automation for SMBs. ## Best AI voice agent by industry (comparisons) - [Best AI Voice Agent for Restaurants](https://kalem.me/blog/best-ai-voice-agent-for-restaurants): 2026 platform comparison for takeout, reservations, and after-hours. - [Best AI Voice Agent for Dental Clinics](https://kalem.me/blog/best-ai-voice-agent-for-dental-clinics): Scheduling, recall, insurance, HIPAA-ready handoff. - [Best AI Voice Agent for Medical Clinics](https://kalem.me/blog/best-ai-voice-agent-for-medical-clinics): Scheduling, intake, hold-time reduction, HIPAA-ready handoff. - [Best AI Voice Agent for Real Estate](https://kalem.me/blog/best-ai-voice-agent-for-real-estate): Lead qualification, showing scheduling, CRM integration. - [Best AI Voice Agent for Home Services](https://kalem.me/blog/best-ai-voice-agent-for-home-services): Job booking, dispatch, FSM integration, after-hours capture. - [Best AI Voice Agent for Small Business](https://kalem.me/blog/best-ai-voice-agent-for-small-business): Self-serve setup, low monthly cost, free tier. ## Use cases - [تأكيد طلبات الدفع عند الاستلام — العربية](https://cod.kalem.me/): وكيل صوتي ذكي يتحدث باللهجة السعودية لتأكيد المشتري والعنوان وتفاصيل الطلب وجدية الشراء. - [COD Order Confirmation — English](https://cod.kalem.me/en): Saudi Arabic AI voice calls that verify cash-on-delivery buyers, addresses, order details, and purchase intent. - [COD machine-readable context](https://cod.kalem.me/ai.txt): Bilingual product facts and direct audio/video demonstration links. - [Restaurants](https://kalem.me/use-cases/restaurants) - [Real Estate](https://kalem.me/use-cases/real-estate) - [Dental Clinics](https://kalem.me/use-cases/dental-clinics) - [Home Services](https://kalem.me/use-cases/home-services) - [Logistics](https://kalem.me/use-cases/logistics) - [Lead Qualification](https://kalem.me/use-cases/lead-qualification) - [All use cases](https://kalem.me/use-cases) ## Optional - [Privacy Policy](https://kalem.me/privacy-policy) - [Terms of Service](https://kalem.me/terms-of-service) - [Cookie Policy](https://kalem.me/cookie-policy) - [Sitemap](https://kalem.me/sitemap.xml)