How we built 850Santral from zero
FreeSWITCH, voice agents, real customers. Taking an AI phone assistant to production.
The biggest operational load on small and mid-size businesses in Turkey is still the phone. Appointments, orders, price inquiries, reservations — handled one by one. 850Santral was built to offload that work to an AI phone assistant.
Why FreeSWITCH?.
Off-the-shelf voice AI products are fast to start but expensive and inflexible. FreeSWITCH gave us full control: call routing, IVR, audio quality, multi-line, recording.
- ▸200+ concurrent calls on a single Kubernetes pod
- ▸STT (Whisper) + LLM (GPT-4) + TTS (ElevenLabs) chain under 1.5s response time
- ▸Isolated per-customer config, agent persona, knowledge base
Production challenges.
The gap between a demo and production was huge. Network latency, cut-off sentences, users suddenly changing topic, noisy environments — every one is its own engineering problem.
“The week we shipped v1, we stayed up debugging 'the AI keeps talking after the user hangs up'. That's when the real work began.”
What it does today.
850Santral now runs 24/7 across restaurants, salons, clinics, and service businesses. Marketing automation, sales, appointments — all in the agent layer. It's a production-grade product under Maksinet.