Arize Phoenix in 2026: The Self-Hosted Observability Stack for Agents
Phoenix accepts OpenTelemetry traces from any framework, runs anywhere from your laptop to Kubernetes, and is fully open source with no feature gates.
11 min read
Archive page 727 of 1230
AI Voice Agent Insights & Guides
Browse older CallSphere articles on AI voice agents, contact center automation, and conversational AI.
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From the blog
Latest articles
Migrate Twilio Studio/Flex Flows to an OpenAI Realtime Hybrid
Studio and Flex are great UI but bottleneck on rigid IVR logic. Add OpenAI Realtime as the natural-language frontend — keep Flex for human routing.
13 min read
Realtime Alerting on Call Sentiment Drops: A Pipeline That Actually Pages People in 2026
Sentiment alerting is easy to ship and hard to make useful. We cover thresholding, debouncing, baseline drift, and a Slack/PagerDuty integration that doesn't generate alert fatigue. Includes the SQL we use at CallSphere.
10 min read
State Data Residency for AI Voice in Healthcare — Texas, Nevada, Colorado in 2026
Texas SB 1188 requires US-resident EHRs from January 1, 2026; Nevada's consumer-health-data law constrains health data; Colorado AI Act takes effect June 30, 2026. AI voice agents must architect for state-by-state data localization.
11 min read
Fireworks.ai for Voice Agents: FireAttention 4× Lower Latency (2026)
Fireworks.ai's proprietary FireAttention engine delivers 4× lower latency than vLLM, 150ms P50 TTFT on Llama 70B, and 92.1% multi-tool function calling accuracy. Voice-agent build guide.
12 min read
Postgres + DuckDB for AI Analytics: pg_duckdb Speeds Up OLAP 100x (2026)
pg_duckdb embeds DuckDB inside Postgres so transactional and analytic queries share the same database. AI dashboards that took 90 sec on Postgres run in <1 sec via DuckDB — without leaving Postgres.
11 min read
Pre-Fetching Common Tool Results for Voice Agents (2026)
Most voice-agent tool calls hit the same hot data: caller account, upcoming appointments, recent invoices. Pre-fetch on call connect so the LLM never waits. ToolCacheAgent and Asteria show 1.8-3.2x speedups.
11 min read
Foundation Model Lab Consolidation 2026: OpenAI's M&A vs Anthropic's Compute Bet
OpenAI closed 6 acquisitions in Q1 2026; Anthropic took 3.5GW TPU from Google + Broadcom. Two divergent consolidation plays inside the foundation model layer, explained.
10 min read
AudioWorklet for Low-Latency Voice Processing in 2026: RNNoise + WASM at 13ms
RNNoise compiled to WASM and loaded into an AudioWorklet processes 48 kHz audio at ~13 ms latency, runs noise-gate hysteresis, and converts Float32 to Int16 PCM — all on a non-DOM audio thread.
10 min read
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