Sinch AB

Twilio is widely regarded as the industry-standard CPaaS provider, delivering enterprise-scale APIs and SDKs for programmable messaging (SMS, MMS, WhatsApp), voice, video, and multi-factor verification (Twilio Verify).

An Ericsson subsidiary, Vonage offers developer-focused communications APIs spanning programmable SMS, MMS, WhatsApp, Voice, WebRTC video, and Verify APIs for fraud prevention.

Infobip provides global omnichannel communication APIs across SMS, RCS, WhatsApp, voice, and identity verification, underpinned by over 800 direct operator connections.

Bandwidth pairs its nationwide and global carrier IP voice network with programmable voice, messaging, MFA, and emergency services APIs for high-volume enterprise traffic.

Telnyx is an API-first licensed global telecommunications carrier providing low-latency programmable voice, SMS, MMS, number provisioning, and real-time SIP trunking infrastructure.

Plivo provides enterprise-grade, cost-effective cloud APIs for two-way SMS, MMS, voice calling, SIP endpoints, and multi-factor authentication across 190+ countries.

Formerly MessageBird, Bird delivers developer-first APIs for programmatic SMS, WhatsApp, conversational voice, and verification backed by global telecommunications routing.

AWS delivers developer SDKs and cloud APIs to embed real-time audio, video, messaging, and PSTN audio calling directly into web and mobile applications.

Agora specializes in real-time engagement APIs, offering developers low-latency interactive voice, video calling, and chat SDKs supported by its Software-Defined Real-Time Network (SD-RTN).

Provides one of North America's most established turnkey private-label cloud communications partner programs (Customer Ownership Reseller / CORE), giving MSPs end-to-end brand control, enterprise 99.999% uptime SLAs, and integrated telecom tax calculation and filing support.

Purpose-built turnkey white-label UCaaS platform designed specifically for MSPs, interconnects, and IT resellers, providing comprehensive re-branding, integration with MSP billing platforms, and partner training via SkySwitch University.

Created by former MSP operators to deliver a turnkey private-label UCaaS and hosted voice platform coupled with an integrated quote-to-cash engine (ViiBE), automated telecom taxation handling, and resellable AI voice tools.

Offers RingOS, a complete white-label UCaaS and hosted PBX platform engineered for MSPs that unifies quoting, zero-touch device provisioning, branded customer portals, and recurring billing into a single ecosystem.

Delivers an all-in-one private-label hosted PBX and UCaaS platform designed for IT service providers and MSPs, backed by proprietary softphone apps, turn-key billing automation, and a fully outsourced 24/7/365 US-based NOC.

Offers the NetSapiens platform, a premier Class-5 softswitch and UCaaS engine utilized across North America by service providers and larger MSPs seeking complete platform control, native team collaboration, and flexible per-seat or per-session wholesale models.

Specializes purely in private-label hosted PBX and UCaaS systems for IT providers and MSPs, providing turnkey multi-tenant partitioning, brand customization, automated billing rating engines, and carrier redundancy.

Delivers a robust multi-tenant UCaaS and PBX platform tailored to MSP operational workflows, supporting fully re-brandable web and mobile interfaces, flexible self-hosted or fully hosted options, and PSA software integrations.

Offers carrier-neutral, white-label cloud-based switching and billing software for telecom resellers and MSPs who prefer to bring their own SIP termination and DID carriers while maintaining unified brand control across end-user portals and softphones.

Twilio provides developer-centric APIs and comprehensive software development kits for programmatically embedding SMS, MMS, voice calling, conversational messaging, and omnichannel chat into modern applications at worldwide scale.

Infobip offers a full CPaaS suite with extensive international operator coverage, unified APIs for multi-channel messaging (SMS, RCS, WhatsApp, Viber), and voice capabilities optimized for enterprise engagement.

Vonage, a subsidiary of Ericsson, provides flexible communications APIs enabling developers to easily integrate global SMS, programmable voice, video, and social messaging channels into enterprise software stacks.

Bandwidth operates its own nationwide and global all-IP telecom network, providing software developers with direct carrier-grade APIs for programmable voice, SMS, MMS, and emergency call routing.

Plivo delivers developer-friendly, cost-effective APIs to send SMS, manage phone calls, and build conversational messaging experiences across over 190 countries.

Telnyx provides an API-driven cloud communication network that directly routes voice and messaging over a private global backbone, delivering low latency and elastic SIP trunking alongside programmatic SMS.

Bird provides a global omnichannel messaging and voice API platform connecting applications directly to SMS, WhatsApp, and conversational interfaces with integrated orchestration and flow builders.

CM.com delivers global CPaaS solutions providing REST APIs for transactional SMS, programmable voice, RCS, and chat applications with native payment and security tools.

Route Mobile delivers cloud communications and A2P messaging infrastructure, offering global enterprise APIs for SMS, voice, identity verification, and conversational messaging channels.

Nationwide Tier-1 CLEC network owner providing direct wholesale SIP trunking, local/toll-free origination, and termination with carrier-grade control and compliance for high-volume enterprises and service providers.

Direct facilities-based wholesale carrier offering elastic SIP trunking, nationwide origination/termination, multi-tenant portal management, and developer APIs with native STIR/SHAKEN attestation.

Leading competitive local exchange carrier (CLEC) providing wholesale SIP trunking, local transit, and origination/termination services across thousands of U.S. interconnections.

Specialized wholesale SIP trunking provider tailored for MSPs, integrators, and software platforms, featuring the HyperNetwork route-optimization engine and self-service DID origination.

Delivers wholesale carrier services originating from its VoIP Innovations division, offering multi-carrier origination, termination, and DID warehousing tailored for MSPs and resellers.

Wholesale voice platform combining thinQ multi-carrier least-cost routing (LCR) with scalable inbound DID origination and automated outbound failover for communications providers.

Dedicated BCM One brand focused on enabling MSPs and PBX resellers with turnkey wholesale SIP trunking, automated telecom tax collection, and customer billing tools.

Provides Elastic SIP Trunking with instant global provisioning, carrier-grade U.S. termination/origination reach, and deep enterprise PBX/SBC interoperability.

Engineered for contact centers and voice resellers requiring direct Tier-1 carrier routes, elastic SIP trunking, full STIR/SHAKEN attestation, and developer-friendly voice APIs.

Offers industry-standard programmable voice APIs, global carrier connectivity, SIP trunking, WebRTC SDKs, and comprehensive call orchestration primitives for technical teams.

Provides a private global IP network, direct carrier termination, programmable Call Control APIs, real-time media streaming, and granular SIP trunking configuration.

Operates an owned Tier-1 nationwide IP voice network in the US with global reach, offering low-latency Voice APIs, real-time media streaming, and direct SIP orchestration.

Provides mature voice APIs with JSON-based Nexmo Call Control Objects (NCCOs), SIP interconnects, WebRTC clients, and extensive global telecommunications reach.

Delivers developer-focused Voice APIs and XML call control primitives, supporting automated call routing, global SIP endpoints, and real-time audio streaming over WebSockets.

Founded by the creators of FreeSWITCH, offering advanced low-latency Call Fabric APIs, SWML orchestration, and native SIP/WebRTC bridging built for real-time applications.

Maintains an extensive carrier network with programmable Calls APIs, enabling global inbound/outbound voice routing, audio broadcasting, and SIP integration.

Specializes in modern real-time WebRTC infrastructure with SIP inbound/outbound gateways, ideal for low-latency voice applications, dynamic bridging, and AI agent media pipelines.

Provides real-time engagement APIs through an ultra-low latency software-defined network, offering voice SDKs and SIP integration gateways for telephony-to-app communication.

Operates an enterprise-grade global IP voice network covering over 60 countries with direct-to-carrier connectivity, native BYOC support for major CCaaS/UCaaS platforms (Genesys, Microsoft Teams, Zoom Phone, Cisco Webex), and built-in global emergency calling compliance.

Provides Elastic SIP Trunking with global PSTN termination and origination, offering instantaneous self-service provisioning of international DIDs/toll-free numbers across 100+ countries, failover disaster recovery routing, and native support for major enterprise PBX and contact center systems.

Delivers global carrier-grade SIP trunking over a private fiber backbone, acting as a licensed carrier in dozens of international markets with automated DID provisioning, granular routing controls, and full BYOC integration for enterprise unified communications.

Offers tier-1 international voice reach through its Global SIP Connect service, delivering extensive two-way PSTN replacement, full regulatory compliance, and multi-cloud collaboration interconnections across North America, Europe, and Asia-Pacific.

Delivers global cloud SIP trunking and international number coverage across 120+ countries, offering specialized BYOC and SIP link integrations for major contact centers and UCaaS providers with integrated regulatory compliance.

Provides enterprise-grade SIP trunking (VoIP Access) with deep pan-European and Asian metropolitan network footprint, offering fully compliant PSTN replacement, DDI allocations, and certified direct routing for cloud collaboration suites.

Provides Vodafone Business Global SIP, consolidating international corporate voice across dozens of countries with carrier-grade SLAs, centralized routing, and certified enterprise UC/CCaaS interoperability.

Delivers BT Global SIP, enabling multinational organizations to centralize PSTN access, port existing numbers, and connect legacy PBXs or cloud platforms (such as Cisco Webex, Microsoft Teams, and Zoom) across international territories.

Features a Tier 1 global IP backbone providing enterprise SIP Trunking, BYOC connectivity, and virtual number porting for cloud-connected environments including Microsoft Teams, Cisco Webex Calling, and Google SIP Link.

Provides a turnkey cloud voice service delivery and enablement platform (AudioCodes Live Platform) that automates SBC management, lifecycle operations, and PSTN connectivity across Microsoft Teams (Direct Routing and Operator Connect Accelerator), Zoom Phone, and Webex Calling without customer on-premises equipment.

Offers an automated cloud provisioning and orchestration platform designed to provision, manage, and automate PSTN carrier connectivity and numbers across Microsoft Teams Operator Connect, Zoom Phone Provider Exchange, and Webex Calling.

Operates an international carrier-grade voice network paired with automated cloud routing software and APIs that power Operator Connect for Microsoft Teams, Zoom Phone BYOC/peering, and Webex without customer-side physical SBC infrastructure.

Delivers cloud-native Session Border Controller as a Service (Ribbon Connect) facilitating automated SaaS-based voice enablement, SIP routing, and portal administration for Microsoft Teams Direct Routing/Operator Connect and Cisco Webex Calling.

A specialized enterprise voice provider offering fully cloud-hosted voice enablement via SeRVE, delivering automated PSTN connectivity across Microsoft Teams Operator Connect, Zoom Phone, and Cisco Webex Calling globally.

Integrates Microsoft Teams Operator Connect, Cisco Webex Calling, and Zoom Phone into a unified cloud-native environment managed through CallTower Connect for turnkey self-provisioning, number management, and hardware-free PSTN delivery.

Provides fully managed, 100% cloud-hosted PSTN connectivity and automated provisioning for Microsoft Teams Phone via Operator Connect and Direct Routing across over 100 countries without customer SBC hardware.

Provides OneVoice for Operator Connect and Direct Routing, enabling multinational and regional enterprises to connect Teams, Zoom, and Webex to global PSTN voice infrastructure through fully cloud-managed peering.

Offers cloud voice automation and enablement services for Microsoft Teams and multi-UCaaS environments, supplying automated carrier provisioning, hosted SBC infrastructure, and Operator Connect services across Europe and global locations.

Offers an industry-standard developer ecosystem for programmable SMS, MMS, RCS, and voice APIs with tier-1 carrier redundancy and proven enterprise scalability across North America and worldwide.

Operates its own nationwide CLEC IP voice network in North America while providing programmable voice, messaging, and emergency calling APIs backed by direct network infrastructure across over 60 countries.

A licensed telecommunications carrier that operates an owned global private IP network with low-latency edge points of presence for programmable voice, SMS, and SIP trunking APIs.

Features extensive direct operator connectivity and data centers worldwide, delivering resilient programmable voice, SMS, RCS, and omnichannel messaging APIs tailored for global enterprise requirements.

Ericsson-owned enterprise communication platform delivering robust programmable voice, SIP, and messaging APIs with global carrier reach and carrier-grade infrastructure.

Provides scalable, cost-efficient cloud communication APIs for programmable voice and SMS with carrier-direct connections spanning North America and over 190 countries.

Operating under the Bird brand, provides high-throughput developer APIs for SMS, voice, and omnichannel messaging with carrier failover capabilities across international networks.

Founded by the authors of the open-source FreeSWITCH engine, delivering developer-first programmable unified communications, low-latency voice, and messaging infrastructure.

Leverages global Tier-1 telecom infrastructure and subsea network connectivity alongside Kaleyra assets to deliver enterprise-grade programmable voice and messaging APIs internationally.