Communication APIs (CPaaS)
Programmable voice, SMS, verification, video and email - REST APIs and SDKs on top of Dollu's own carrier network.
5
Core APIs, one account
99.99%
API availability SLA
< 100 ms
Median API latency
APIs / CPaaS, delivered as one portfolio.
Most CPaaS vendors resell someone else's carrier network. Dollu's APIs sit directly on top of our own voice switching, numbering inventory and SMS routing - so you get carrier pricing, carrier reach and a developer experience that would not look out of place at a Silicon Valley API company.
Buy a number, place or receive a call, stream media to your AI agent, send an OTP or start a video session with a few lines of code. Webhooks report every event; dashboards show usage, cost and quality; role-based sub-accounts let you resell to your own customers.
SDKs are available for Node.js, Python, Java, Go, PHP and .NET, with OpenAPI specs and Postman collections for everything else.
Everything in APIs / CPaaS.
Each service has its own detailed page - overview, capabilities, onboarding, use cases, specifications and FAQs.
Voice API (Programmable Voice)
Programmable voice via REST and SDKs: outbound and inbound calls, IVR, recording, transcription, TTS/STT, conferencing and WebSocket media streams on Dollu's network.
SMS & Messaging API
Send and receive SMS, MMS, RCS and WhatsApp from one API with two-way messaging, number provisioning, DLR webhooks, templates and sub-accounts on 800+ operator routes.
Verify API (OTP & 2FA)
Phone and identity verification via one API: OTP over SMS, voice, WhatsApp, flash call and email, silent network authentication, auto failover and AIT fraud protection.
Video & WebRTC API
In-app voice and video calling with WebRTC SDKs for web, iOS and Android: 1:1 and group rooms, screen share, recording, PSTN dial-in/out and global TURN infrastructure.
Email API & SMTP Relay
Transactional and bulk email via REST API or SMTP relay: DKIM/SPF/DMARC set-up, dedicated IPs with warm-up, templates, webhooks, analytics and address validation.
Number Lookup & Phone Intelligence API
HLR/MNP lookup, live subscriber status, carrier and line-type detection, roaming and ported-number resolution and fraud scoring via REST API or batch, sub-second latency.
Fax API & Cloud Fax
Send and receive fax via REST API, T.38/G.711 SIP trunks or email-to-fax on fax-enabled numbers in 60+ countries, encrypted at rest with configurable retention policies.
What sets our apis / cpaas apart.
Built on our network
APIs terminate directly on Dollu's switching and numbering - no middlemen, wholesale-level pricing.
Developer-first
REST + webhooks, six SDKs, sandbox accounts, detailed error codes and versioned APIs with long deprecation windows.
AI-ready media
Bidirectional audio streaming over WebSocket, TTS/STT hooks and low-latency SIP for voice-AI agents.
Enterprise controls
Sub-accounts, spend limits, IP allow-lists, SSO, audit logs and regional data residency options.
Built for the sectors that depend on communications.
- Banking & Financial Services
Carrier-grade OTP messaging, secure contact-centre voice and private connectivity for banks, insurers, NBFCs and fintechs - built for regulated traffic, audited networks and zero tolerance for downtime.
- Contact Centres & BPO
CLI-guaranteed outbound termination, inbound toll-free and DIDs in 100+ countries and a CCaaS stack that scales from 20 seats to 20,000 - for operators who live by answer rates and cost per minute.
- Carriers, MNOs & MVNOs
Wholesale voice and SMS, bilateral interconnection, roaming and signalling, A2P monetisation and number hosting - from a carrier that operates 600+ direct interconnects and 800+ SMS operator connections.
- Healthcare & Life Sciences
Appointment reminders that cut no-shows, telehealth voice and video APIs, number masking that protects patient privacy and connectivity built for clinical uptime - with GDPR- and HIPAA-aligned controls.
- E-commerce & Retail
Order OTPs and shipping notifications at peak-season scale, WhatsApp and RCS engagement, delivery number masking, omnichannel support and store connectivity - one carrier across the whole customer journey.
- Travel, Hospitality & Logistics
Booking and gate-change alerts in any country, local numbers for every property and hub, IoT SIMs and fleet tracking across borders, and a contact centre that follows the sun.
- Media, Broadcast & Gaming
Contribution and distribution circuits for broadcasters, CDN and live-event connectivity, a low-latency 1.4 Tbps backbone, DDoS protection for game servers and voice and chat APIs for in-game communities.
- SaaS, ISVs & Startups
Voice, SMS, verify and video APIs on a carrier's own network, numbers in 110+ countries, white-label reselling and usage-based pricing - from your first sandbox call to your first hundred million.
APIs / CPaaS - common questions.
The questions customers and carriers ask us most often before they interconnect. If yours is not here, our team answers within one business day.
Still have a question?
Ask our solutions teamOther service areas.
- Voice & Wholesale Carrier Services
Global A–Z voice termination, SIP trunking, carrier interconnects and voice-quality management over Dollu's own switching core, with direct routes to 600+ carriers.
- Global Numbers & DIDs
Virtual numbers, DIDs, toll-free, mobile and cloud calling numbers across 110+ countries with regulatory-compliant KYC, porting and inbound routing.
- Messaging & A2P SMS
Enterprise and wholesale A2P SMS, international SMS termination, OTP/verification, RCS and WhatsApp Business messaging over direct MNO connections with SMS-firewall protection.
- Unified Communications & Contact Centre
Cloud PBX, UCaaS, omnichannel CCaaS, Microsoft Teams Direct Routing/Operator Connect, IVR and conversational AI - delivered on Dollu's carrier network with global numbering.
- Network & Connectivity
Enterprise WAN and internet: MPLS/IP-VPN, dedicated internet access, SD-WAN, Ethernet private lines, managed WAN/LAN/Wi-Fi, cloud and data-centre connectivity, and private 5G.
- Cloud & Hosting
Cloud infrastructure, private and hybrid cloud, managed hosting, cloud migration, backup and disaster recovery, and edge/GPU compute - with private connectivity built in.
- Cyber Security
Network-integrated security: DDoS mitigation, managed next-gen firewall, SASE and Zero Trust access, managed detection and response, and security assessments.
- Mobile, Roaming & IoT
IoT connectivity with eSIM and multi-carrier SIMs, international roaming and steering, SS7/Diameter signalling services, and fleet & asset tracking solutions.
- Media & Content Delivery
Global video transmission for contribution and distribution, live-event and remote-production connectivity, and content delivery network services for OTT and gaming.
Talk to our apis / cpaas team.
Share your requirements - destinations, countries, sites, volumes - and we will come back with a design and commercial proposal within one business day.
