Everything about Sinch — the network, the products, and how to sell it.

The CPaaS market has moved from simple developer-centric SMS and voice APIs into an integrated ecosystem spanning omnichannel messaging, conversational AI, transactional email infrastructure, and carrier-grade telecommunications networking. Sinch AB (Nasdaq Stockholm: SINCH) is one of the largest and most structurally differentiated companies in that market.

Founded in 2008 in Stockholm as CLX Communications, Sinch grew deep roots in telecom engineering, mobile operator infrastructure, and wholesale application-to-person messaging. A multi-billion-dollar run of acquisitions — Inteliquent at 1.14 billion dollars, Pathwire at 1.9 billion dollars covering Mailgun, Mailjet and Email on Acid, MessageMedia at 1.3 billion dollars, SAP Digital Interconnect, Wavy, ACL Mobile and MessengerPeople — turned it into a full-stack customer engagement platform.

Software-first CPaaS providers historically act as application routers sitting on top of regional aggregators, clearinghouses and wholesale transit brokers. Every intermediary adds latency, a point of failure, synthetic delivery receipts, and a markup.

AGGREGATOR MODEL
[ App ] --REST--> [ CPaaS wrapper ] --SMPP--> [ Aggregator ]
                                                  |
                        [ Transit broker ] --> [ MNO ] --> [ Handset ]
  high hop count, stacked markups, synthesized DLRs

SINCH SUPER NETWORK
[ App ] --REST--> [ Sinch Conversation Engine ]
                              |
     --Direct SS7 / SMPP / CLEC SIP--> [ Tier-1 MNO ] --> [ Handset ]
  single hop, carrier-native DLRs, sub-500ms delivery

• Latency minimization

  Direct SS7, SMPP and IP peering with 600+ operators removes broker queues, cutting time-critical OTP delivery from 3–8 seconds to under 500 milliseconds.

• Carrier-native delivery receipts

  Aggregators often synthesize a 'delivered' acknowledgment on packet receipt. Sinch returns authentic receipts generated by the terminating handset network.

• Intelligent dynamic routing

  Machine learning telemetry watches packet loss, congestion and route health across millions of streams, rerouting across redundant circuits during peak load.

With the 1.14 billion dollar Inteliquent acquisition, Sinch became an underlying telecommunications infrastructure provider in North America. Inteliquent runs the largest independent carrier-grade Tier-1 voice network in the United States and is a licensed Competitive Local Exchange Carrier in all fifty states.

• Reach

  More than 94% of the US population across 12,200+ on-net rate centers.

• Volume

  Over 300 billion voice minutes annually, underpinning major UCaaS and CCaaS platforms including Zoom and Cisco Webex.

• Number administration

  Direct allocation rights from NANPA with an active inventory above 100 million numbers.

• STIR/SHAKEN A-level attestation

  As a licensed carrier, Sinch signs outbound calls on its own switches, keeping enterprise calls from being flagged Spam Likely.

• E911 and NG911

  Real-time location validation and emergency routing to over 6,000 public safety answering points in the US and Canada.

• SMS and MMS

  High-throughput A2P and P2A messaging over short codes, toll-free numbers, 10DLC and international alphanumeric sender IDs, with automatic GSM-7 and UCS-2 transcoding.

• RCS Business Messaging

  A premier Google RCS for Business partner and active GSMA contributor. Verified sender badges, carousels, action chips, quick replies and rich media cards inside native Android and iOS messaging apps.

• WhatsApp Business Platform

  Official Meta Business Solution Provider integration with template messaging, 24-hour session windows, catalogs, interactive lists and multi-product checkout.

• OTT social channels

  Apple Messages for Business including Apple Pay sheets and time pickers, Instagram Direct, Facebook Messenger, Viber, LINE and KakaoTalk.

"channel_identities": [
  {"channel": "RCS",      "identity": "+14155550199"},
  {"channel": "WHATSAPP", "identity": "+14155550199"},
  {"channel": "SMS",      "identity": "+14155550199"}
],
"message": {
  "choice_message": {
    "text_message": {"text": "Flight CX-882 boards at Gate B12."},
    "choices": [
      {"postback_data": "btn_seat", "text_message": {"text": "View Boarding Pass"}},
      {"postback_data": "btn_help", "text_message": {"text": "Contact Support"}}
    ]
  }
},
"channel_priority_order": ["RCS", "WHATSAPP", "SMS"],
"failover_ttl": 120

• Voice API

  RESTful call control using SVAML instructions for IVR, dynamic call steering, conferencing, dual-channel recording, and neural text-to-speech and speech-to-text.

• In-app calling and WebRTC video

  iOS, Android and JavaScript SDKs delivering encrypted high-definition Opus voice and peer-to-peer or SFU video inside your own app.

• Elastic SIP trunking and BYOC

  Direct SIP peering for contact centers and UCaaS deployments such as Microsoft Teams Direct Routing, Zoom Phone and Genesys Cloud, with TLS and SRTP encryption.

• Number masking

  Virtual proxy routing that connects two parties — a driver and a passenger, for example — while keeping both real numbers private.

[ PRE-DEPLOYMENT QA ]  ->  Email on Acid
      previews across 100+ clients | WCAG checks | spam-trap analysis
[ CAMPAIGN BUILDER  ]  ->  Mailjet
      drag-and-drop templates | segmentation | EU data residency
[ INFRASTRUCTURE API]  ->  Mailgun
      transactional REST/SMTP | inbox placement | reputation management

• Mailgun

  Developer-first transactional email API processing billions of messages monthly, with machine-learning Send Time Optimization, automated dedicated IP warmup, inbound parsing webhooks and real-time mailbox verification.

• Mailjet

  Visual marketing and automation platform with real-time multi-user collaborative template design, segmentation and European data sovereignty options.

• Email on Acid

  Pre-deployment diagnostics: rendering previews across 100+ clients and devices, spam filter testing, link validation and WCAG accessibility checks.

• Multi-modal Verification API

  One SDK managing SMS OTP, voice OTP, WhatsApp verification and flash calling — an automated missed call whose token is intercepted on Android.

• Silent Network Authentication

  Cryptographic device authentication over the cellular data connection, validating SIM identity against carrier home location registers with no code for the user to type. This removes OTP phishing and man-in-the-middle token theft entirely.

• Fraud Defender and AIT protection

  Real-time anomaly detection blocking artificial inflation of traffic, also called SMS pumping, before fraudulent traffic reaches carrier billing.

• Carrier intelligence

  Live number portability lookups, line type detection, and SIM-swap event checks on rolling 24 to 72 hour windows.

• Chatlayer by Sinch

  Low-code conversational AI with proprietary multilingual understanding across 100+ languages from a single model, LLM orchestration and hybrid human handover.

• Sinch Engage

  Turnkey conversational marketing and care inbox for WhatsApp, Messenger and Instagram across distributed service teams.

• Sinch Contact Pro

  Cloud omnichannel contact center with native SAP and Salesforce integrations, skill-based routing and WebRTC softphones.

• Moat 1 — Telecom assets

  Owning the CLEC network and 600+ interconnects eliminates the aggregator tax and gives direct control over termination.

• Moat 2 — Full-lifecycle email

  The only major CPaaS vendor combining high-throughput delivery, visual campaign collaboration and pre-send inbox QA under one architecture.

• Moat 3 — Omnichannel abstraction

  New channels turn on without backend rewrites; the platform handles transcoding and failover.

• Moat 4 — First-mover RCS

  Years of co-engineering RCS with Google and global operators, ahead of enterprise migration to verified rich messaging.

Software-only aggregators buying connectivity through intermediate brokers absorb a 15 to 30 percent wholesale markup that is passed down to the enterprise. Because Sinch runs on-net across its owned CLEC and direct carrier connections, it holds a structural cost advantage: direct route economics, pooled global volume commitments across regions, and transparent pass-through of regulatory fees such as US 10DLC carrier fees without platform surcharges.

• Onboarding conversion

  Sign-up conversion drops roughly 1% for every 2 seconds of OTP latency. Direct routing delivers in under 500 milliseconds.

• Cart recovery

  Abandoned cart alerts decay steeply when delayed. Direct routes keep them out of promotional batch queues during peak retail events.

• Toll fraud elimination

  Fraud Defender and Data Verification validate SIMs at the carrier level, removing SMS pumping exposure and cutting verification costs 20 to 30 percent.

• Vendor consolidation

  One master services agreement, one global SLA above 99.95% covering SMS, voice, email and identity, and unified billing with cross-product rebates.

• Multi-modal fallback

  Data verification, then flash call, then WhatsApp, then SMS OTP — guaranteeing session completion while lowering per-verification cost.

• Number masking marketplaces

  Anonymized voice and SMS proxies protecting privacy in ride sharing, food delivery and service marketplaces.

Picture a restaurant. You are the enterprise application — Uber, Airbnb, a bank's mobile app. The kitchen is the telecom carrier: AT&T, Verizon, T-Mobile, the people with the infrastructure to actually deliver a text or a call. You cannot walk into the kitchen and cook. You need a waiter. The API is the waiter. You say 'deliver this six-digit passcode to John's phone', the waiter runs to the kitchen, makes sure it is prepared correctly, delivers it, and comes back to confirm.

CPaaS means Communications Platform as a Service. The old way: a bank wanting automated fraud alerts had to buy millions of dollars of telecom hardware, install cables in a server room, and negotiate contracts with every phone company on earth. The CPaaS way: Sinch built that infrastructure and put it in the cloud, so any business connects its software over the internet and reaches billions of people.

• 1. The direct super highway

  Most competitors are couriers driving crowded public roads and paying tolls to third-party trucking companies. Sinch owns a private multi-lane highway. No middleman brokers means lower prices, delivery under 500 milliseconds, and near-zero dropped messages.

• 2. The universal translator

  To speak to someone in France, Spain and Japan you would normally hire three translators. The Conversation API is one. The enterprise writes one message; Sinch delivers it as an RCS card on Android, an Apple Message on iPhone, WhatsApp in Europe and LATAM, or plain SMS as fallback — saving hundreds of engineering hours.

• 3. The complete email lifecycle

  Competitors give you a truck to deliver letters. Sinch gives you the writer's desk (Mailjet), the high-speed truck (Mailgun), and the proofreader who checks every letter before it leaves the warehouse (Email on Acid).

• Stage 1 — Connect

  Most high-growth companies we speak with reach a point where communication APIs are both a major operating expense and a critical driver of conversion — while paying aggregator markups and juggling separate vendors for SMS, email and verification.

• Stage 2 — Diagnose

  When you send millions of verification codes, every fraction of a second of delay hurts sign-up conversion. Are you relying on aggregators routing through multiple hops, or do you have direct carrier connections?

• Stage 3 — Demonstrate

  Sinch combines developer-friendly APIs with an owned network connected directly to 600+ global carriers and the largest voice network in the US — eliminating middleman costs and putting SMS, WhatsApp, voice and Mailgun email under one contract.

• Stage 4 — Propose

  You don't rewrite your codebase. Set Sinch up as a secondary route for one high-volume use case, run side by side, and decide on real data.

• Killer question 1

  How much are aggregator markups and growing SMS volume impacting your margins?

• Killer question 2

  Are OTP delivery delays or SMS pumping fraud hurting your onboarding conversion?

• Killer question 3

  How many vendor contracts are you juggling across SMS, voice, verification and email?

• How to close

  Propose a zero-risk, side-by-side traffic test on high-volume routes to prove speed and cost savings.

These are not technical questions. Nobody is asking you to explain SS7. They are asking you to explain why they should care, in their language: growth, margin, brand and risk.