Voice API & Programmable Voice
NobleStack's Voice API turns every application into a communication channel. With a few lines of code, your product, CRM, or internal tool can place and receive calls, run interactive menus, mask numbers for privacy, and record conversations — all backed by carrier-grade infrastructure and India-wide plus international connectivity.
Programmable Voice - Built for Developers
Our programmable voice platform gives your engineering team full control over the call lifecycle through clean REST APIs and real-time webhooks. Whether you are building click-to-call inside a web app or an automated reminder system that reaches thousands of customers, the Voice API scales with your business without you managing a single telephony server.
Key Capabilities
- Click-to-call and in-app calling using REST APIs, SIP, and WebRTC
- Programmable IVR flows configured in code, with DTMF input capture
- Number masking and call anonymisation to protect customer and agent privacy
- Automatic call recording with secure cloud storage and retrieval
- Real-time call control — bridge, transfer, hold, and conference on the fly
- Global and India-wide call termination with virtual and DID numbers
- Detailed call detail records (CDRs) and delivery analytics via API
- Webhooks for live call events so your systems always stay in sync
Why Businesses Choose The NobleStack Voice API
- High-availability infrastructure engineered for consistent call quality
- Transparent, usage-based pricing that scales from startup to enterprise
- Clear documentation, SDKs, and sandbox access for fast integration
- Security-first design with encryption in transit and access controls
Popular Use Cases
- Privacy-protected calling for cab, delivery, and marketplace platforms
- Automated appointment and payment reminders at scale
- Customer-support callbacks triggered directly from your CRM
- Two-factor voice verification as a fallback to SMS OTP
How it works
One API call, four stages of the call lifecycle
From the moment your backend fires a request to the moment the CDR lands in your warehouse — every stage is programmable and observable.
Request
Your app calls the API
POST a single JSON payload with the from, to, and the webhook you want call events delivered to. Authentication is a bearer key — no SIP stack to build.
Routing
We pick the best carrier route
The platform selects a least-cost, highest-quality route across our India-wide and international carrier pool, then places both legs of the call.
In call
Control the leg in real time
Bridge, transfer, hold, conference, capture DTMF, or play prompts mid-call. Every state change fires a webhook so your systems stay in sync.
After call
CDRs, recordings, analytics
The final webhook carries duration, disposition, and a signed recording URL. Pull the same data later from the CDR API for reporting.
99.95%
Platform uptime SLA
7Cr+
Daily OBD handled
500+
Businesses onboarded
24×7
Engineering support
Talk to us
Talk to our team about what you are building
Tell us the workflow you have in mind and the scale you expect. Our solutions team maps it to the right NobleStack setup, flags anything that needs a custom approach, and sends you pricing for your volume — no obligation.
Same-day response
Weekday enquiries get a reply within business hours.
A specialist, not a script
You speak to someone who has actually shipped this kind of setup.
Compliance answers upfront
Consent, data residency, retention, and audit questions covered early.