Voice AI Uptime: DevOps Patterns for a Reliable Voice Bot SLA

Cost of Downtime

Every minute your bot is silent, someone hangs up. At 5,000 inbound calls per hour, a single-minute outage means ≈83 missed conversations. If each call is worth ₹120 in lifetime value, that's ₹10,000+ vaporised.

Multiply that by a ten-minute blip and you grasp why voice ai uptime is more than a vanity metric—it's revenue insurance. This guide breaks down the components, dashboards, and drills that keep an ai telephony reliability target of 99.8% intact.

Keywords: voice ai uptime, reliable voice bot, voice bot SLA, ai telephony reliability

Defining Reliability: SLA vs. SLO vs. SLI

Reliability jargon can feel alphabet-soupy; here's a concise map.

Term	What It Means	Example in Voice AI
SLI – Service-Level Indicator	Raw measurement	Call success rate: 99.92%
SLO – Service-Level Objective	Internal target	99.9% call success rate
SLA – Service-Level Agreement	Customer promise	99.8% uptime or credit

Architecting for 99.8% Uptime

A two-nines-plus target looks tame—until you translate it: ≤8 h 45 m downtime per year. Hitting that number requires layered resilience.

1 — Geo-Redundant SIP Trunks

• Terminate calls in at least two telco PoPs (e.g., Mumbai + Bengaluru).
• Each trunk group runs active-active; DNS SRV balances by weight.

2 — Autoscaling Speech Microservices

• STT/TTS pods scale on CPU >65% or requests/second > threshold.
• Use node pools with GPU labels; autoscaler spins up in <90 s.

3 — LLM & NLU Pool Hot-Standby

• Route requests across multiple Azure OpenAI endpoints or direct OpenAI API regions (US East, West Europe, Southeast Asia).
• Implement circuit breakers with 3-second timeouts; failover to secondary provider if primary hits rate limits.

4 — Real-Time Health Checks

• Synthetic dials every 30 s from three regions hit /ping‐ivr, record RTT + transcription accuracy.
• Any three consecutive failures yanks region out of weighted DNS.

5 — Secure Edge & Data Residency

• TLS 1.3 for SIP over WebSockets; recording blobs stored in country.
• Details in /security.

Raya case note

Raya's production telemetry (Aug 2024 – Jun 2025) logs 99.83% voice ai uptime across 1 million minutes, covering Hindi, and English calls. Dual PoPs and aggressive autoscaling clipped median post-dial delay to 720 ms.

Phase	Activities	Owner
Pre-Go-Live	Load test 5× peak RPS, chaos-kill a SIP pod, validate TLS cert rotation.
Failover Drill	Disable primary PoP during low traffic, observe auto-reroute <3 s.
Post-Incident RCA	Tag timeline, map SLI dip, create JIRA for config drift fix within 24 h.

Phase

Activities

Owner

Pre-Go-Live

Load test 5× peak RPS, chaos-kill a SIP pod, validate TLS cert rotation.

Failover Drill

Disable primary PoP during low traffic, observe auto-reroute <3 s.

Post-Incident RCA

Tag timeline, map SLI dip, create JIRA for config drift fix within 24 h.