Browse older CallSphere articles on AI voice agents, contact center automation, and conversational AI.
From the blog
VAD doesn't make ASR more accurate — it controls endpointing latency, barge-in feel, and turn-taking. We tune Silero VAD threshold, prefix_padding, and silence_duration_ms with real production traces.
DTLS 1.3 (RFC 9147) is rolling out across browsers in 2026. SRTP keys must rotate per session and the cipher floor moved to AES-128-GCM with PFS. Here is what production HIPAA voice needs.
Oregon Formal Opinion 2026-208 said yes — qualified — to autonomous AI client intake. Here is the ABA Model Rules map, the unauthorized-practice line, and the safe-harbor checklist for legal-services AI voice and chat.
The 2022 RLHF recipe (SFT → reward model → PPO) is largely dead in 2026 — frontier labs have moved to GRPO and DAPO with verifiable rewards. We unpack what changed, when reward modeling still matters, and how OpenRLHF makes it production-ready.
Drizzle ORM ships first-class pgvector helpers in 2026. Wire HNSW cosine search to gpt-4o-mini for sub-50ms RAG with type-safe queries — no Python, no Pinecone.
AI BANT qualifiers respond in <60 seconds vs 1-24 hours for human SDRs and qualify 100% of leads, delivering 2-3x more pipeline. Here is the cold-call qualifier playbook.
How Anatel's General Numbering Regulation, the DDD area-code system, Resolution 777/2025's call-authentication requirement, and the GT-AUTENTICA working group shape AI voice agents in Brazil.
Modern jailbreaks (Context Compliance, multi-turn escalation, many-shot) chew through 2024-style "never roleplay as another AI" guards. We share the 2026 layered prompt-hardening pattern — instruction stability, role lock, refusal taxonomy, runtime telemetry — that CallSphere ships in every agent system prompt.
VAPI deprecated 'Custom Functions' for the Tools API. Wire a webhook tool, secure with HMAC, and ship a working appointment-booker — code + pitfalls.
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