How to Train an AI Voice Agent on Your Business: Prompts, RAG, and Fine-Tuning
A practical guide to training an AI voice agent on your specific business — system prompts, RAG over knowledge bases, and when to fine-tune.
16 min read
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AI Voice Agent Insights & Guides
Browse older CallSphere articles on AI voice agents, contact center automation, and conversational AI.
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Twilio + AI Voice Agent Setup Guide: End-to-End Production Architecture
Complete setup guide for connecting Twilio to an AI voice agent — SIP trunking, webhooks, streaming, and production hardening.
17 min read
Observability for AI Voice Agents: Distributed Tracing, Metrics, and Logs
A complete observability stack for AI voice agents — distributed tracing across STT/LLM/TTS, metrics, logs, and SLO dashboards.
16 min read
Voice AI Latency: Why Sub-Second Response Time Matters (And How to Hit It)
A technical breakdown of voice AI latency budgets — STT, LLM, TTS, network — and how to hit sub-second end-to-end response times.
14 min read
Voice-First Hotel Operations: OpenAI Realtime API + Hotel Workflows
OpenAI's Realtime API enables sub-1-second voice conversations that transform hotel operations. Here's how CallSphere uses it for hotel workflows.
7 min read
Hume EVI 3 vs GPT-4o: Which Sounds More Human?
Hume EVI 3 beats GPT-4o on empathy and naturalness in blind tests, at sub-300ms latency. When an emotion-aware voice agent is worth it, and when it is not.
9 min read
WhatsApp Business API and the AI Receptionist: 2026 Pricing Reality
Meta's January and April 2026 pricing changes, the new AI Provider policy, and what they mean for an SMB AI receptionist on WhatsApp.
11 min read
Simulcast and SVC for AI Voice Agents: Multi-Quality Streams in 2026
Simulcast and SVC are usually a video story — but in 2026 they matter for voice-only AI agents that publish video avatars or screen-share alongside speech.
10 min
ElevenLabs ElevenAgents vs OpenAI Realtime: Cost Compared in 2026
ElevenAgents charges per minute. OpenAI charges per token. The real cost compare flips depending on prompt size and call length. Here is the math on identical 5-minute calls.
10 min read
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