Voice API
Click-to-call · Advanced routing · Sales playbook · IVR
5
Channels in one API
100+
Countries supported
99.99%
API uptime SLA
Days
Not months to integrate
What is CPaaS?
Communication capabilities, on demand, via API — built into anything you ship.
CPaaS is the infrastructure layer that lets you embed real-time voice, video, SMS, WhatsApp and email directly into your own applications — without building or managing the underlying telecoms infrastructure yourself.
Use cases include OTP and 2FA, appointment reminders, order notifications, click-to-call, AI-powered inbound IVR, WhatsApp campaigns, bulk SMS and video consultations.
- No telecoms infrastructure to manage — we handle reliability, routing and failover
- Simple REST APIs that integrate in days with any tech stack
- Pay only for what you use — no minimums, no long-term contracts
- Scale from 1 message to 10 million without changing a line of code
// Send a WhatsApp reminder in a few lines const metro = require('metrosales-api'); await metro.whatsapp.send({ to: '+91 98765 43210', template: 'visit_reminder', params: { name: 'James', time: 'Sat 11am' } });
✓ delivered · wa_8f3k2 · 184 ms
<200msLatency
99.99%Uptime
5Channels
What makes us different
Hybrid CPaaS — the flexibility no one else offers.
Standard CPaaS gives you APIs. MetroSales Hybrid CPaaS gives you APIs plus a ready-made engagement layer — build what you need, use what we've built, or combine both.
Standard CPaaS
Raw API access — build everything yourself
Voice, SMS, WhatsApp, email and video APIs with full programmatic control. Ideal for teams with development resources who want maximum customisation.
MetroSales Advantage
Hybrid CPaaS
APIs + intelligent engagement layer
Everything in Standard, plus post-communication event handling, AI-triggered follow-ups, hyper-personalised sequencing, unified engagement history and our advanced API exchange algorithm — all under one window.
Email API
Hyper-personalised · Delivery tracking · Open & click rates
SMS API
Personalised & bulk · DLT compliant · Real-time delivery
WhatsApp API
Official API · Personalised exchange · Two-way messaging
Video API
In-app video · Screen share · Session recording
Use Cases
What teams are building with MetroSales CPaaS
OTP & 2FA Authentication
Deliver one-time passwords via SMS or voice in under 200ms — with automatic fallback across channels if delivery fails.
Appointment Reminders
AI-personalised reminders via WhatsApp, SMS or voice — triggered from your calendar or CRM. Reduce no-shows by up to 60%.
Order & Delivery Notifications
Proactive transactional alerts across WhatsApp and SMS, with two-way response handling built in.
Click-to-Call & Call Tracking
Embed click-to-call in your website or app. Track which campaigns drive calls, route to the right rep, record every conversation.
AI-Powered IVR & Virtual Agents
AI understands natural language, routes callers, answers FAQs and escalates to a human when needed.
WhatsApp Sales Campaigns
Broadcast personalised WhatsApp messages to thousands of leads — with AI content, response tracking and automatic follow-ups.
Why MetroSales CPaaS
More capable. More affordable. More integrated.
We operate our own voice infrastructure and maintain direct partnerships with 1,600+ Tier 1 and local carriers — eliminating the third-party markup competitors pass on to you.
99.99%
Uptime SLA
Seven global Points of Presence and two NOCs providing round-the-clock redundancy.
1,600+
Carrier relationships
Better deliverability, lower latency and more competitive pricing than any reseller.
Native
MetroSales integration
Every API event flows into your sales pipeline, lead records and analytics automatically.
Start building
Ready to embed intelligent communication into your product?
Talk to our API team — we'll walk you through the right CPaaS option for your stack, use case and scale. Most integrations go live within a week.