Build the contact center
stack your revenue
depends on.
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.
Call with
+91 98•••• 4521
Campaign · Home Loans – Pan India
CRM · auto pop
Rahul Sharma
Noida, Sector 62
Loan ₹45 L · Salaried
Last remark: call after 5 pm
Disposition
Product preview · sample data
New · AI voice bots
Don't read about it. Talk to it.
Our AI voice bots qualify leads, book appointments and remind EMIs in Hindi, English and Hinglish, on your own phone lines. Talk to Riya, our real-estate bot, right here — or try a bot for your industry.
Real Estate · Outbound
Riya · Skyline Greens (demo)
Ready when you are
You play the customer. Try saying:
Hinglish · English · Hindi2-min demo · uses your microphone · audio is processed live by our AI provider and not stored by NSSSoft
Powering 500M+ calls annually across 120+ contact centers
Outbound Dialing
Pick the dialing mode your team actually needs
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.
Predictive Dialer
An AI-driven outbound dialer that dials multiple numbers simultaneously per agent, predicting when they will become available and minimizing idle time.
Best for
- High-volume outbound BPOs
- Debt collection & recovery
- Telemarketing & insurance
Key Capabilities
- Answering Machine Detection (AMD) — <1.5s detection
- TCPA / DNC list scrubbing on every dial
- Abandonment-rate control (target ≤3%)
- Dynamic dial ratio (1:1 → 3:1 per skill group)
- Real-time supervisor dashboards
Open-Source Cores
Enterprise depth on open-source foundations
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
Asterisk
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.
- Custom IVR trees & DTMF handling
- Skill-based & priority queuing
- ARI/AMI REST & event-socket apps
- FreePBX + custom GUI modules
- Recording, transcription & archival
Media powerhouse for high-concurrency stacks
FreeSWITCH
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.
- 10k+ concurrent SIP sessions per node
- WebRTC gateway (SIP↔WebRTC bridge)
- Conference & broadcast servers
- Real-time ESL event-socket apps
- Codec transcoding (G.711, G.729, Opus)
Carrier-grade SIP routing at the edge
OpenSIPS
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.
- SIP load balancing & failover
- Session Border Controller (SBC)
- Least-cost routing (LCR)
- Real-time fraud detection & rate-limiting
- Number portability (LNP) & DID routing
Architecture
How every call moves through the stack
From carrier ingress to agent desktop — every layer is owned, configured, and monitored by NSSSoft engineers. Hover any node for details.
By Industry
Built for your vertical, not just "contact centers"
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.
BPO
Multi-client, multi-campaign predictive dialing with isolated tenants, real-time reporting, and agent-level KPIs.
Debt Collection
TRAI-compliant progressive dialing, DNC scrubbing, right-party verification IVR, and payment-link SMS.
BFSI
Encrypted call recording, PCI-DSS pause-and-resume for card data, regulatory call archival, and CTI for core banking.
Healthcare
HIPAA-compliant call flows, appointment reminders via IVR & SMS, consent capture, and patient-ID verification.
EdTech
High-volume lead-gen calling for admissions, auto-scheduled demo reminders, and WhatsApp follow-up integration.
Real Estate
Preview dialing for high-ticket property sales, geo-targeted lead routing, and automated site-visit scheduling SMS.
ITSP / Carrier
OpenSIPS-based multi-tenant SIP trunk provisioning, LCR, number inventory management, and CDR billing APIs.
Product Deep Dive
Every product, engineered end-to-end
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.
Lead Management System
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.
- DNC & internal blacklist scrubbing on every import
- Time-zone-aware pacing (no calls before 8 AM local)
- Disposition-driven recycling with configurable retry caps
- Lead scoring and priority weighting
- Real-time sync to Salesforce, HubSpot, Zoho & Leadsquared
Predictive campaign
Home Loans – Pan India
Dialed
12.4 L
today
Connected
4.7 L
AMD skip
2.1 L
Abandon
1.8%
IVR Flow Builder
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.
- Visual drag-and-drop node editor
- TTS (gTTS, AWS Polly, Azure Neural) & STT (Whisper, Google)
- DTMF & voice input with NLP intent matching
- Live API data dips mid-call (balance check, OTP verify)
- Multi-language with per-caller language detection
Inbound DID
0120-4••• 210
Welcome
TTS · Hindi / English
Menu
Press 1 · 2 · 3
1 · Sales
Queue · 1,200 agents
2 · Support
Queue · 800 agents
3 · AI bot
2,000 channels · 24×7
After hours
Business-hours rule
Callback
Auto-scheduled
Inbound today 1,86,400Self-served 72%Avg wait 0:14
WebRTC Softphone
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.
- Works in Chrome, Edge, Firefox — no extension required
- TLS signalling + SRTP media — end-to-end encrypted
- Presence, transfer, hold, DTMF from the browser UI
- Works alongside Yealink, Grandstream, Cisco, Zoiper, MicroSIP
- CRM screen-pop opens automatically on inbound
Call with
+91 98•••• 4521
Campaign · Home Loans – Pan India
CRM · auto pop
Rahul Sharma
Noida, Sector 62
Loan ₹45 L · Salaried
Last remark: call after 5 pm
Disposition
SMS Gateway
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.
- Bulk campaigns with scheduling & rate-cap controls
- OTP & transactional — sub-3s delivery SLA
- 2-way: inbound keywords trigger IVR or agent handoff
- DLR webhooks to your CRM or BI tool
- TRAI DLT compliant — PE ID, template hash tagging
Dialer
12.4 L
4.7 L connected
IVR
1.86 L
72% self-served
Voice bot
2.48 L
9,860 visits booked
Custom CRM
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.
- Call pop on inbound & predictive-connected calls
- Configurable lead pipeline with stage-based SLAs
- Ticketing with SLA timers & escalation rules
- Role-based access: Agent, TL, Supervisor, Admin
- REST API + webhooks for any downstream system
Logged in
5,000
On call
4,000
Ready
620
Break
380
Calls today 14.3 LConnect rate 38%Avg talk 3:12
Integrations
Connects to the tools your team already uses
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
How ShieldFinance went from 18% to 52% right-party connect rate
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
Enterprise-grade security, not checkbox compliance
Security is designed into the deployment — not bolted on as a tier-3 feature upgrade.
Data Residency
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.
Encryption in Transit & at Rest
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.
TRAI / DLT Compliance
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.
GDPR & Data Subject Rights
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
Cloud, on-prem, or hybrid — your call
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
From the teams who run on our stack
“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
Get Started
Let's architect your contact center.
Tell us your scale, your stack, and your compliance constraints. We'll spec an exact solution — no generic demo, no sales deck fluff.