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Technical Guides

Technical Guides for AI Voice Agent Engineers

Deep technical guides for building, scaling, and operating AI voice agents — OpenAI Realtime API, Twilio, multi-agent architectures, observability, and reliability patterns.

9 of 49 articles

Voice AI Tool Schema Design: CallSphere Patterns vs Vapi
Migrating From Vapi to CallSphere: 14-Step Cutover Checklist
13 min read11

Migrating From Vapi to CallSphere: 14-Step Cutover Checklist

Complete 14-step migration playbook from Vapi to CallSphere covering number porting, KB export, prompt mapping, tool re-implementation, dual-run and cutover.

K8s + Hostpath Backend Hot-Reload: CallSphere Edge Over Vapi Cloud
9 min read9

K8s + Hostpath Backend Hot-Reload: CallSphere Edge Over Vapi Cloud

k3s + hostPath volumes give CallSphere agent hot-reload without redeploys. Vapi customers ship through their pipeline. Engineering velocity matters.

Spam + Robocall Mitigation: CallSphere vs Vapi Reputation Systems
15 min read6

Spam + Robocall Mitigation: CallSphere vs Vapi Reputation Systems

STIR/SHAKEN, branded calling, opt-in lists, carrier reputation. How CallSphere builds outbound trust vs Vapi defaults. Real-world spam-flag remediation.

Hierarchical Agent Handoffs (OpenAI Agents SDK) vs Vapi Squads
9 min read8

Hierarchical Agent Handoffs (OpenAI Agents SDK) vs Vapi Squads

Triage to specialist to return-to-orchestrator pattern explained with code. CallSphere's OpenAI Agents SDK handoffs vs Vapi Squads' linear chain.

OpenAI Realtime API: How CallSphere Ships Faster Than Vapi
9 min read13

OpenAI Realtime API: How CallSphere Ships Faster Than Vapi

Direct OpenAI Realtime + Agents SDK = thinner stack vs Vapi's vendor middleware layer. CallSphere ships voice agents in days, not sprints.

Context Persistence Across Channels: CallSphere vs Vapi Limit
12 min read8

Context Persistence Across Channels: CallSphere vs Vapi Limit

How CallSphere's shared customers/patients tables propagate state across voice, chat, SMS, and email. Vapi has no native cross-channel state.

Custom Voice Cloning Pipelines: CallSphere vs Vapi ElevenLabs Setup
13 min read10

Custom Voice Cloning Pipelines: CallSphere vs Vapi ElevenLabs Setup

ElevenLabs voice cloning workflow end to end. CallSphere salon and sales platforms ship with ElevenLabs integrated. Vapi users wire it themselves.

Server-Side VAD Reliability: CallSphere vs Vapi Turn Detection
9 min read10

Server-Side VAD Reliability: CallSphere vs Vapi Turn Detection

Server-side VAD via OpenAI Realtime beats client-side VAD on false-trigger and cut-off problems. CallSphere's turn detection vs Vapi's pipeline.

Showing 9 of 49