ANONYMIZED CLIENT / FREIGHT TECHNOLOGY / PRODUCTION VOICE AI

Voice AI answering every freight call before a representative.

I built the VoIP infrastructure and real-time AI path from scratch, operating at ~30K calls per day with immediate AI answering, fraud checks, load verification, qualification and structured live handoff.

ROLEVOIP ARCHITECT + ENGINEER

VOLUME~30K CALLS / DAY

PRODUCTION~500 CONCURRENT CALLS

COVERAGE100% AI-FIRST ANSWERING

THE SITUATION

Every freight call needed an immediate answer, but only qualified opportunities should reach a representative.

Inbound traffic mixed legitimate loads with repetitive questions, incomplete data and fraud risk. The platform had to answer every call, verify the caller and load, collect missing context and preserve the live session when transferring a viable conversation.

ARCHITECTURE

Keep call control deterministic while AI and speech services remain replaceable.

The SIP session survives slow or failed downstream dependencies. FreeSWITCH owns media and interruption; Node.js coordinates AI, verification and a context-rich live transfer.

01 INBOUND CALLPSTN / SIP trunkimmediate answer
→ 02 SIP CONTROLDrachtio + Node.jssession ownership
→ 03 MEDIAFreeSWITCH ESLRTP + barge-in
→ 04 VOICE AIDeepgram + Vapiverify + qualify
→ 05 LIVE HANDOFFvalidated contextrepresentative / TMS

WHAT I BUILT / HARD PROBLEMS

Scale, low latency and failure recovery all had to work without sacrificing a live call.

AI-FIRST CALL CONTROL

Every inbound session enters the same deterministic path for fraud checks, load verification, qualification and transfer.

LOW-LATENCY BARGE-IN

Speech detection, partial transcripts and interruption control were tuned to reduce response latency without clipping callers.

FAILURE-SAFE SCALE

Stateless control, horizontally scaled media and correlated call state kept calls recoverable when an AI or infrastructure dependency failed.

OUTCOME

Every inbound call answered immediately by AI at production scale.

The agent handled the first conversation on every call, detected fraud signals, verified the load and collected missing information. Only qualified calls were transferred, with context and call state preserved for the representative.

~30K CALLS / DAY / ~500 CONCURRENT IN PRODUCTION / 100% AI-FIRST ANSWERING / TESTED ABOVE PRODUCTION LOAD

DRACHTIO · FREESWITCH · ESL · NODE.JS · DEEPGRAM · VAPI · KUBERNETES / EKS · AWS

All scale figures are approximate production values; 100% refers to AI answering first, not end-to-end resolution without a representative.

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