We engineer custom dialers, IVR, WebRTC, and CRM on Asterisk, FreeSWITCH, and OpenSIPS — tailored to your dialplan, compliance zone, and CRM stack. Cloud, on-prem, or hybrid.
Powering 500M+ calls annually across 120+ contact centers
New · AI voice bots
Our AI voice bots qualify leads, book appointments and remind EMIs in Hindi, English and Hinglish, on your own phone lines. Ask our AI receptionist anything, or try a bot for your industry.
AI Receptionist · Inbound
Ready when you are
You play the customer. Try saying:
English · Hindi · Hinglish2-min demo · uses your microphone · audio is processed live by our AI provider and not stored by NSSSoft
Outbound Dialing
Not every campaign is the same. NSSSoft engineers all three dialer modes — often running concurrently on the same platform — so you can match pacing to use case.
An AI-driven outbound dialer that dials multiple numbers simultaneously per agent, predicting when they will become available and minimizing idle time.
Best for
Key Capabilities
Open-Source Cores
We don't resell hosted platforms. We own the code, manage the configs, and carry the pager. Each platform is hardened, monitored, and scaled to your exact traffic profile.
The PBX workhorse — owned and mastered
We build and maintain production Asterisk deployments from scratch — custom dialplans, ARI/AMI application integrations, FreePBX hardening, and multi-tenant queue configurations. If your workflow needs it, we dialplan it.
Media powerhouse for high-concurrency stacks
FreeSWITCH is our choice when a single node must carry 5,000–10,000 concurrent calls with full transcoding, conferencing, or WebRTC bridging. We write ESL applications and maintain the core from source.
Carrier-grade SIP routing at the edge
OpenSIPS is our session border controller — handling SIP load balancing, least-cost routing, fraud detection, and number-range management at the carrier layer before calls ever touch a media server.
Architecture
From carrier ingress to agent desktop — every layer is owned, configured, and monitored by NSSSoft engineers. Hover any node for details.
By Industry
Every industry has different compliance requirements, call flows, and KPIs. We've shipped production systems in each of these — and know the edge cases that matter.
Multi-client, multi-campaign predictive dialing with isolated tenants, real-time reporting, and agent-level KPIs.
TRAI-compliant progressive dialing, DNC scrubbing, right-party verification IVR, and payment-link SMS.
Encrypted call recording, PCI-DSS pause-and-resume for card data, regulatory call archival, and CTI for core banking.
HIPAA-compliant call flows, appointment reminders via IVR & SMS, consent capture, and patient-ID verification.
High-volume lead-gen calling for admissions, auto-scheduled demo reminders, and WhatsApp follow-up integration.
Preview dialing for high-ticket property sales, geo-targeted lead routing, and automated site-visit scheduling SMS.
OpenSIPS-based multi-tenant SIP trunk provisioning, LCR, number inventory management, and CDR billing APIs.
Product Deep Dive
These aren't checkboxes on a feature list. Each module below is a production system we've shipped, maintained, and scaled for real contact centers.
Ingest leads from any source — CSV, CRM webhook, or API — and run them through configurable scrub rules (DNC, time-zone, duplicate) before a single dial goes out. Recycling queues automatically re-attempt based on disposition codes and cooling periods.
Design call flows in a drag-and-drop canvas — no dialplan coding required for business users. Developers can still inject custom Asterisk AGI or FreeSWITCH ESL for data dips, CRM lookups, or payment routing at any node.
Agents take calls in Chrome or Edge — no plugin, no desktop app install. The softphone runs over TLS+SRTP and coexists on the same PBX as Yealink desk phones and Zoiper softphones. One dialplan, every endpoint.
Bulk, transactional, OTP, and 2-way SMS through our own SMPP aggregator stack. DLR callbacks confirm delivery in real time. TRAI DLT registration and PE/TM tagging handled end-to-end.
A purpose-built CRM for contact-center workflows — not a generic sales tool retrofitted with a dialer bolt-on. Pipeline stages, call pop, ticket management, role-based access, and REST APIs that connect to any system you already run.
Integrations
Native integrations, REST APIs, and Zapier/Pabbly connectors. If you run a CRM we haven't listed, we build the connector — it's part of the engagement.
Bring your own CRM — we integrate it+ custom REST / SMPP / webhook integrations on request
Case Study
ShieldFinance, a 280-seat debt collection BPO, was running an off-the-shelf hosted dialer that couldn't handle their custom DNC logic or integrate with their in-house collections CRM. We re-architected the entire stack on FreeSWITCH + OpenSIPS with our predictive engine and deployed it on their private cloud in 6 weeks.
+188%
Right-party connect rate
3.2M+
Calls / month handled
6 wks
Full deployment timeline
“NSSSoft didn't just install software. They understood our collections workflow, our compliance constraints, and the quirks of our CRM. What we got is a system that feels like it was built specifically for us — because it was.”
Rohan Ahuja
VP Operations, ShieldFinance
Security & Compliance
Security is designed into the deployment — not bolted on as a tier-3 feature upgrade.
Deploy on your own cloud account (AWS, GCP, Azure) or our private cloud in India. Data never leaves your designated region. On-premise options provide complete air-gap isolation.
TLS 1.3 for all signalling (SIP/TLS, HTTPS). SRTP for media. Call recordings encrypted with AES-256 and stored in customer-controlled object storage with configurable retention policies.
Every outbound SMS carries the registered PE ID and pre-approved template hash. Scrubbing against the TRAI DNC Registry runs before each campaign launch — not at dial time.
Right-to-erasure APIs built in. Call recordings, lead data, and CDRs can be purged by customer ID on demand. DPA (Data Processing Agreement) available on request.
Deployment
NSSSoft deploys the exact same software stack in all three modes. Choose based on your compliance posture, IT budget, and latency requirements.
| Feature | Cloud (SaaS) | On-Premise | Hybrid |
|---|---|---|---|
| Managed infrastructure | |||
| Data stays on your servers | |||
| CAPEX-zero (opex model) | |||
| Custom network integration | |||
| Air-gap / offline capability | |||
| Auto-scaling burst capacity | |||
| Hardware CAPEX | |||
| Regulatory data residency | |||
| Time-to-deploy | Weeks | Weeks |
What clients say
“We evaluated five vendors. NSSSoft was the only one that actually read our compliance documentation before the demo. The system they built handles our TRAI DLT requirements out of the box — something no hosted platform could do without custom work we'd have to maintain ourselves.”
Kavita Sharma
Head of Telesales, PrimeCare Health
Resources
A dial ratio above 2:1 on a predictive dialer risks abandon-rate violations under TRAI regulations. Here's how to calculate the safe ceiling for your agent-to-line count.
Read moreWhen the hosted dialer couldn't handle their custom DNC logic, TeleCorp BPO switched to a self-hosted FreeSWITCH stack. The numbers six months later.
Read moreThe decision isn't always obvious. Media-heavy workloads, transcoding, and WebRTC favour FreeSWITCH. IVR-heavy dialplan logic often favours Asterisk. A breakdown by use case.
Read moreGet Started
Tell us your scale, your stack, and your compliance constraints. We'll spec an exact solution — no generic demo, no sales deck fluff.