Agent Memory in 2026: mem0 vs Letta vs Zep, and Which Voice Agents Need It
Agent memory matured in 2026 with mem0, Letta, and Zep all hitting production. Here is how to pick — Zep beats mem0 by 15 points on LongMemEval.
10 min read
Archive page 837 of 1224
AI Voice Agent Insights & Guides
Browse older CallSphere articles on AI voice agents, contact center automation, and conversational AI.
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Build an AI Voice Agent with Azure Communication Services Call Automation (2026)
Wire ACS Call Automation bidirectional streaming to Voice Live API for production PSTN AI agents. Real C# Web App, EventGrid hookup, midcall barge-in, transfer-to-human flow.
13 min read
Public AI Voice Case Studies in Hospitality 2026: Wyndham + Canary, Hilton's 41 Use Cases
Wyndham's 5,000-property Canary AI Voice rollout, Hilton's 41 AI experiments, and the upsell + booking metrics published by hotel groups in 2026 — broken down with build details.
10 min read
ASI PMS vs CallSphere: Which Hotel System Wins in 2026
A line-by-line comparison of ASI PMS (Anand Systems) vs CallSphere's 11-agent hotel voice and chat platform, for independent and boutique operators.
8 min read
Post-Service Survey Voice Agent: NPS/CSAT Response Rates 4-5x Higher
AI voice surveys hit 20-40% completion vs 2-8% for email — and capture quantitative scores and open-ended feedback in one call. Here is the post-service survey playbook.
9 min read
Service Mesh for AI Agents: Istio Ambient vs Linkerd (2026)
Run an AI agent fleet behind Istio Ambient with the Gateway API Inference Extension, or Linkerd for the simpler path. mTLS, traffic split, and KV-cache-aware routing.
12 min read
Hotel OTA Channel Manager: How AI Voice Agents Complement Siteminder, Cloudbeds
AI voice agents and OTA channel managers solve different problems. Here's how CallSphere works alongside Siteminder, Cloudbeds, and Derbysoft to optimize both.
6 min read
SIP over WebSocket for Browser AI Voice in 2026: When sipws Beats WebRTC
WebRTC dominates browser AI voice for a reason - UDP under the hood. But SIP over WebSocket still wins for click-to-call inside a SaaS app where you control both ends. Here is the 2026 picture.
10 min read
How Agentic AI Is Replacing Legacy Hotel PMS Systems in 2026
Independent hotels are moving off legacy PMS platforms like ASI, Opera, and Maestro toward multi-agent AI systems that run reservations, check-in, housekeeping, and night audit end-to-end.
7 min read
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