Arena District, a 156-acre commercial real estate development near McAllen, Texas, hired Agxntsix to turn 14 road signs into a 24/7 sales channel. Agxntsix built a bilingual AI phone platform on Retell AI — receptionist Sofia and sales agent Marco — that answers every call in English or Spanish, syncs to Twenty CRM, and warm-transfers hot buyers with full caller-ID privacy.
Agxntsix Team
Updated on Jun 2026
Arena District is a 156-acre commercial real estate development with 11 CBD-zoned lots in Hidalgo, Texas, in the McAllen-Edinburg-Mission metro of the Rio Grande Valley. Fourteen physical signs display one vanity number — 956-917-LAND — and every call to it lands in a platform Agxntsix engineered: two named Retell AI voice agents (Sofia, the receptionist; Marco, the sales specialist), a TypeScript/Hono webhook server, a 10-step pipeline into Twenty CRM, Claude post-call analysis, a five-tier drip sequence, Twilio SMS, and the Astro marketing site at arenadistricttx.com. The engagement ran from first commit on March 10, 2026 through production hardening into May 2026.
Fourteen signs along Rio Grande Valley roads generate inbound calls from developers, investors, and brokers at all hours — many in Spanish. Before the platform, every inquiry depended on a human being free to pick up, and a missed call on a multi-acre commercial lot is a missed seven-figure conversation with no record it ever happened.
The before-state was a signage funnel with no infrastructure behind it: a prospect drives past one of the 14 signs, dials, and the outcome depends on luck — who answers, what language they speak, whether anyone writes it down. After-hours and weekend calls simply evaporated, each one an unrecoverable relationship with no trace left behind.
Agxntsix custom-engineered the platform rather than configuring an off-the-shelf answering bot: version-controlled agent prompts, 48 automated test files, TCPA consent tracking with unsubscribe endpoints, A2P 10DLC-registered SMS, and a TREC-compliance page on the public site. Real estate communication is regulated, and this build treats compliance as architecture, not an afterthought.
Agxntsix deployed two named voice agents on Retell AI. Sofia, the AI receptionist, answers every inbound call 24/7, auto-detects English or Spanish on the caller's first words, classifies intent across six categories — general info, parcel inquiry, pricing, showing, broker transfer, directions — and runs a structured intake. Marco, the AI sales specialist, takes qualified buyers deeper into lot pricing, backed by a Retell knowledge base of property facts. Hot prospects are warm-transferred to the broker through a caller-ID-masking privacy bridge. After every call, a TypeScript/Hono webhook server runs a 10-step pipeline: parse, normalize phone, extract analysis, write to Twenty CRM, score the lead, log a note, create tasks, send email, send SMS, enroll in drip.
The first commit landed March 10, 2026, and the platform was hardened in production through May 2026 — 235 commits of iterative tuning, including voicemail handling, a pronunciation dictionary, and NATO-phonetic readback for contact details. Agent prompts are version-controlled and deployed by script, 48 Vitest test files cover the system from webhook queue to CRM filter contract, and the server runs behind a Cloudflare Tunnel with graceful degradation.
The most differentiated piece is the warm-transfer privacy bridge. When Sofia or Marco identifies a hot prospect, Retell AI bridges the live call through a dedicated backline number while the prospect sees only the branded Arena District caller ID. The broker joins in real time — introduced with the caller's name, language, and the parcels discussed — and his personal cell number is never revealed. It converts the highest-intent moment of the funnel into a live human conversation without sacrificing the principal's privacy.
Reliability is engineered in, not assumed: webhooks land in a WAL-mode SQLite queue with uniqueness enforced per call and event, so duplicates never create duplicate CRM records; failed jobs retry on exponential backoff; and a token-bucket limiter keeps Twenty CRM traffic under 90 requests per minute.
Every call generated by 14 physical signs is now answered 24/7 in English or Spanish, logged to Twenty CRM with a structured record of the lots discussed, and followed up automatically — shipped from first commit to production hardening in roughly ten weeks.
| Metric | Before | After |
|---|---|---|
| Inbound call coverage | Answered only when a person was free; after-hours calls evaporated | Sofia answers 24/7 on 956-917-LAND |
| Spanish-speaking callers | Dependent on a bilingual human being available | Automatic language detection, full Spanish parity |
| Lead records | No systematic record of callers or lots discussed | 10-step pipeline writes every call to Twenty CRM with lead score, note, and tasks |
| Hot-buyer handoff | Required sharing a personal cell number | Warm transfer with caller-ID masking |
| Follow-up | Manual and ad hoc | SMS packet within 60 seconds plus a five-tier drip, Day 1 to Day 30 |
These are infrastructure facts, not projections: the call-analytics database holds full transcripts and structured analysis for every production call — which lots, which language, which intent — visibility that did not exist in any form before the platform.
Sofia, Arena District's AI receptionist, detects the caller's language on the first turn and conducts the entire conversation in English or Spanish — every prompt, intake question, and guardrail exists in full Spanish parity. Property packets, SMS messages, and drip emails are then delivered in the language the caller actually spoke.
Bilingual coverage is not a translation layer bolted on afterward: both agents' prompts were written with full Spanish parity as a hard rule and hardened in production so neither drifts back to English mid-call. In the McAllen market, that is the difference between qualifying a lead and losing it on the greeting.
The platform uses a warm-transfer privacy bridge: when Sofia or Marco identifies a hot prospect, Retell AI bridges the call through a dedicated backline while the prospect sees only the branded Arena District caller ID. The broker joins the live conversation without his personal cell number ever being exposed.
The transfer is warm, not blind: before the human joins, the AI announces the caller's name, language, parcels discussed, and a summary of the need — captured during Sofia's structured intake, which must complete before any transfer fires. A tuned agent-swap delay makes the hand-off sound natural rather than abrupt.
Within seconds of hang-up, a SQLite job queue runs a 10-step pipeline: parse, normalize phone, extract Retell analysis, write to Twenty CRM, score the lead, log a note, create tasks, send email, send SMS, and enroll in drip. Claude analyzes the transcript and emails the broker a summary within 60 seconds.
Core CRM writes must succeed or retry with exponential backoff, while secondary steps are isolated so a transient email failure never blocks the record of the call itself. Post-call analysis extracts clean canonical CRM values, including 11 boolean fields marking exactly which Arena District lots the caller expressed interest in.
Nurture-sequence drafts for Twenty CRM workflow automation are already staged in the repository alongside a workflow CLI, and the queue-based architecture — agents, pipeline, drip, and SMS — is templated so additional developments or phone lines can be onboarded onto the same platform.
Yes. Arena District's Retell AI agents auto-detect language on the caller's first words and switch instantly. Sofia handles reception and intake in either language, Marco discusses lot pricing in either language, and follow-up emails, SMS property packets, and the five-tier drip sequence are all delivered in the language the caller spoke.
Agxntsix took Arena District's platform from first commit to production hardening in roughly ten weeks, March through May 2026. The core webhook server, both voice agents, and CRM pipeline shipped first; warm transfers, SMS, drip automation, and the marketing site followed in weekly iterations — 235 commits and 48 automated test files in total.
A warm transfer means the AI agent stays on the line and introduces the prospect before connecting a human. Arena District adds caller-ID masking: Retell AI bridges calls through a private backline and displays only the branded company number, so the broker takes hot leads live while his personal cell stays private.
Yes. Arena District runs an A2P 10DLC-registered Twilio number that texts callers a property packet within 60 seconds of hanging up, in English or Spanish to match the call. The five-tier drip email sequence then nurtures the lead from Day 1 through Day 30 with Claude-generated content.
Yes. The platform recognizes returning callers before the first ring finishes. A pre-call lookup races a two-second timeout against Twenty CRM, then hands Sofia dynamic variables — name, preferred language, last topic discussed, and parcels mentioned — so repeat prospects are greeted personally instead of restarting intake from zero.
Agxntsix builds bilingual voice AI platforms that answer every call, log every lead, and hand hot prospects to your team — privacy intact. Book a consultation to see this architecture applied to your business.