Challenge
Contact-center volume spikes exposed brittle routing logic and limited observability across SIP and application layers.
Case study · 2025
Communication & VoIP
Enterprise telephony that never drops the thread
TelephonyVoIPNestJSNode.jsMicroservices
Client
Enterprise contact-center provider
Engagement
VoIP platform modernization
Duration
12 months
Year
2025
ClearCall re-architected brittle telephony routing into observable microservices. SIP trunks, policy-driven queues, recording hooks, and partner APIs sit behind NestJS orchestration with real-time metrics and carrier failover measured in seconds. Peak volume stopped being a fire drill.
A VoIP and telephony platform with SIP trunks, call routing, and NestJS-powered orchestration APIs.
Narrative
How the engagement moved from constraints to a shippable system.
Approach
We redesigned call orchestration as microservices, added real-time metrics, and hardened failover between carriers.
Solution
ClearCall routes millions of minutes with policy-driven queues, recording hooks, and admin APIs for partners.
Scope
What we delivered
Call orchestration microservices on NestJS
SIP trunk and carrier failover configuration
Admin APIs and partner webhooks
Recording and compliance hooks
Real-time routing and health dashboards
Load-test harness for peak campaigns
Highlights
What stood out
99.95% call setup success under peak load
Carrier failover under 3 seconds
Partner-ready REST and webhook contracts
Observable queues for ops and CS leadership
Engagement flow
A repeatable rhythm from discovery through hardening — tuned to this product’s constraints.
01
Traffic & failure mapping
Traced drop causes across SIP, app logic, and carrier edges during spikes.
02
Service decomposition
Extracted routing, recording, and admin domains into microservices.
03
Failover & metrics
Hardened carrier failover and built real-time ops visibility.
04
Partner enablement
Published APIs, webhooks, and runbooks for integrating contact-center partners.
Technology stack
The delivery stack behind this engagement — client surfaces paired with services, data, and infrastructure.
Frontend
Nuxt.jsVueAdmin Console UI
Backend
NestJSNode.jsMicroservicesSIP / Telephony
Infra
DockerKubernetesCI/CDObservability
Outcomes
01
99.95% call setup success under peak load
02
Carrier failover under 3 seconds
03
Partner-ready REST and webhook APIs
Looking ahead
Add AI-assisted agent assist hooks without compromising call audio paths.
More work
Onboard the Apeiriion express
Tell us about your product, platform, or modernization goal — we'll assemble a senior squad and a clear delivery plan.