AI Voice Calling Agent
& Telephony Engine
An ultra-low latency enterprise voice agent that qualifies inbound enterprise leads, handles objection handling, and books calendar slots directly on your CRM across 12 languages — with seamless warm hand-offs to human representatives.
What We Delivered:
Nova — Enterprise Inbound Qualification Agent
Client: B2B SaaS Unicorn ($80M ARR) · Enterprise Software & Financial Services · 4-Week Rapid Deployment
The Architectural Challenge
Prospective high-value buyers calling inbound experienced 8-minute hold times or were pushed to web forms with 40% drop-off. Competitors with instant reps were closing deals first.
The ModelScale Solution
We deployed Nova on a low-latency WebRTC and SIP trunk backbone. Using streaming automatic speech recognition (ASR) coupled with token-speculative LLM execution, Nova answers queries naturally, respects voice interruptions, and accesses Salesforce in real-time.
Key Architectural Highlights
- WebRTC full-duplex audio stream with jitter compensation
- Streaming Deepgram Nova-2 ASR + Cartesia low-latency TTS
- Speculative tool execution anticipating user calendar queries
- Automated warm transfer protocol bridging human reps in < 2 seconds
Production Metrics & ROI
From 4.5 hours down to 12 seconds average response
Increase in completed discovery calls per month
Annual savings in outsourced call center expenditures
Capabilities Delivered in Every System
Full-Duplex Streaming Telephony
WebRTC and SIP trunk infrastructure enabling real-time conversational interruptions, zero audio lag, and natural cadence.
CRM-Grounded Retrieval Augmented Generation
The agent queries your knowledge base, pricing rules, and buyer history in real-time to answer complex technical questions accurately.
Intelligent Human Escalation
When an objection exceeds confidence thresholds or caller demands human rep, the agent warms-transfers with a 3-bullet briefing audio whisper.
Automated CRM Sync & Analytics
Every call generates a structured JSON summary, sentiment analysis score, objection tags, and verified calendar invites.
Battle-Tested Stack & Frameworks
- LiveKit WebRTC
- Twilio Voice SIP
- Deepgram Nova-2
- Cartesia Sonic TTS
- Claude 3.5 Haiku
- GPT-4o-Realtime
- Custom Distilled Mistral 7B
- Redis Pub/Sub
- PostgreSQL
- LangGraph Voice Supervisor
- Datadog Audio Tracing
- Langfuse
- Sentry Telephony Logs
From Scope to Production in Weeks
Phase 1: Telephony Audit & Voice Persona
SIP trunk routing, script playbooks, objection tree mapping, and TTS brand voice cloning.
Phase 2: RAG & CRM Integration
Real-time calendar booking, CRM lookup, and human hand-off protocol.
Phase 3: Production Rollout
High-volume load testing, latency benchmarking, and compliance auditing.
Transparent, Predictable Investment
No surprise overages. Fixed-fee pilot sprints with clear weekly deliverables.
Voice Agent Pilot
Deploy a production inbound qualification line with CRM sync and calendar booking.
- Full voice pipeline with < 400ms latency
- Custom voice clone matching company brand
- Salesforce or HubSpot integration
- Up to 2,500 monthly call minutes included
Enterprise Telephony
RecommendedHigh-capacity inbound and outbound voice agent with human rep warm-transfer and multi-language support.
- 12-language automated detection
- SIP trunk connection to existing PBX
- Live agent whisper audio bridge
- Custom analytics dashboard
- Dedicated Solution Architect
Managed Operations
Ongoing prompt tuning, telephony routing maintenance, and 99.99% uptime guarantee.
- Dedicated Voice Systems Engineer
- Weekly conversation sentiment tuning
- Carrier rate optimization
- 24/7 incident response SLA
Frequently Asked Questions
Can callers tell that they are speaking to an AI agent?
With our sub-380ms turn latency, breath pauses, and custom vocal inflections, callers experience conversational fluidity comparable to a top-tier executive assistant. However, we always recommend compliant disclosure.
How does the agent handle voice interruptions or background noise?
We employ full-duplex WebRTC streaming with Voice Activity Detection (VAD). If the caller speaks mid-sentence, the agent immediately stops streaming audio and adapts to the new input in real-time.
Can it connect to our existing phone numbers and PBX system?
Yes. We support SIP trunks, WebRTC web calling, and direct forwarding from Avaya, Cisco, Twilio, RingCentral, or Genesys.
Your next release runs on our stack.
Book a 30-minute strategy call. We'll audit one workflow, benchmark it against our best-of, and hand you a written roadmap — free.