Best Business VoIP Providers for Linux

T-Mobile for Business provides next-level enterprise network solutions on America's Best Network* to supercharge your business. SuperMobile is the first and only business plan to elevate your critical communications with performance that intelligently adapts to your needs in real time, even in times of high demand, powered by the first-ever nationwide network slice for business. Plus, get cutting-edge privacy protections and robust encryption to keep your communications secure. SuperBroadband delivers unbreakable connectivity nationwide, with unmatched coverage reaching every ZIP code in the U.S., including remote areas where legacy networks simply can't go. Stay online through virtually all outages and manage your connection needs through one contract with managed installation and end-to-end support. For tailored industry solutions, T-Mobile for Business provides right-sized solutions tailored to your industry, enabled by the leader in 5G. T-Mobile for Business meets you where you are at, and allows you to scale and future-proof your business needs. Core Infrastructure also includes backup connectivity options including dual-network redundancy, fixed wireless failover, and resilient LTE/5G backup for uninterrupted operations. Keep your business protected with T-Mobile for Business' enterprise cybersecurity solutions, with strong encryption, secure network design, and continuous threat monitoring. T-Mobile for Business uses a Zero Trust architecture, encrypted data in transit and at rest, multi-factor authentication, and 24/7 security operations to help ensure the confidentiality and integrity of your business communications. T-Mobile Business Internet offers seamless cloud integration with existing IT infrastructure, enabling secure connectivity to public and private cloud platforms, SaaS resources, and other business applications. Businesses can use T-Mobile-supplied routers or compatible BYOD devices (with support for static IP on select models), and benefit from standard network connectivity over Wi-Fi and Ethernet. Optional features such as Secure Access Service Edge (SASE) enhance cloud integration by providing advanced security for cloud-based traffic. Portal-based management and API integration are available for network and IoT environments. *Best Mobile Network in the U.S. based on analysis by Ookla® of Speedtest Intelligence® data 2H 2025.

3CX is a software-based, open standards IP PBX that offers complete Unified Communications, out of the box. Suitable for any business size or industry 3CX can accommodate every need; from mobility and status to advanced contact center features and more, at a fraction of the cost. Ideal for companies working remotely, 3CX includes mobile apps, video conferencing and website live chat. Installation, management and maintenance of the PBX is so easy that you can effortlessly manage it yourself, whether on an appliance or server at your premise on Windows, Linux or in the cloud. Alternatively you can choose to have it hosted by 3CX for a completely hassle-free solution.

Our VoIP solution pairs PBXware with gloCOM: the PBX handles the infrastructure, gloCOM handles what the user actually sees and touches. Calls follow the person across desktop, mobile (iOS and Android), and web on the same number, which removes the friction of being tied to a specific device or location. With v8 multi-CRM support, conversation history logs automatically to each user's CRM across all channels and devices, so client data stays accurate without additional manual work. gloCOM Next runs on a unified codebase across desktop and web, with full branding control through BRM. Fully white-label, so providers own the customer relationship from end to end.

Focusing on delivering "Easy-first Unified Communications", Yeastar P-Series Phone System offers companies of all sizes with a complete package for calls, video, messaging, and integrations, out of the box.

net2phone is an AI-powered business communication platform for companies serious about customer experience. Trusted by 500,000+ users and backed by 30+ years of experience, net2phone eliminates the friction of scattered channels and disconnected tools, so every conversation drives retention and growth. Unite unifies voice, messaging, video, and chat in one place, with call recording, sentiment analysis, and AI-generated follow-ups. AI Agent automates customer inquiries and workflows across phone and chat in 30+ languages, handing off to humans when needed. Coach AI reviews 100% of interactions to guide agent performance. uContact gives high-volume teams omnichannel routing and real-time dashboards. Every solution integrates with the tools you already use and runs on enterprise-grade security. Beyond software, net2phone provides expert guidance at every step, from setup to integration to ongoing optimization, so your technology delivers measurable results.

VirtualPBX gives small businesses a complete, high-powered cloud phone system for $15/user/month with every single feature already included. One simple plan. No contracts. No feature gates. Zero surprises. Just smarter voice for your business—whether your team is at a desk, on the road, or working from home. Deploy AI FrontDesk whenever you're ready for intelligent 24/7 call handling, and scale into advanced messaging tools as your business grows. As the pioneers who invented cloud telephony in 1997, we back every account with expert, U.S.-based human support from people who genuinely understand small business. Because having the right technology is important—but having the right team behind it levels the playing field.

Get a business phone system without breaking the bank! We help small businesses in the United States get access to big business tools, while keeping prices within reach. In fact, with Insider Telecom, we provide the equipment as long as you need it. Enjoy features like caller ID, call forwarding, conference calling, intercom, auto attendant, and many more! No big upfront purchase for a complete business phone service. That's the Insider Telecom difference. Our support team knows that you probably don't speak "telephone." So they're trained to listen for and understand the root of your specific need - from training and configuration, all the way to fitting you with a different phone system. We want to be sure you're working with the right platform.

KrispCall is an AI-Powered Communication Platform for Growing Business that helps you manage your personal, business, and corporate telephony requirements all from a single app (Web, Android, iOS). Get international numbers right from the comfort of your home. KrispCall helps you own national, toll-free, local, shortcode, and international numbers (for over 100 countries) in no time. Manage your call logs effortlessly. KrispCall’s unified callbox allows you to handle and monitor your business calls, recorded conversations, texts, and voicemails all from a single window. Earn trust of your international clients by calling them through their local numbers. KrispCall offers international phone numbers for your business at the most affordable price. With our embeddable widget, you are just a click away from your customers. Clients can now call you directly without hassles by simply clicking on the KrispCall’s widget embedded in your website.

Searching for a smart call centre software? Try CloudTalk.io, a new-generation cloud phone system for SMEs, startups, online stores or call centers (sales and customer service teams). 25+ integrations with favorite CRM, helpdesk or e-commerce tools as Shopify, Salesforce, Pipedrive, Intercom at hand along with a 5-star rated customer success team make it easy to seamlessly migrate or set up your new cloud call centre from scratch. We are rapidly growing every month and we have already successful cooperation with 1000+ companies across the world like DHL, Yves Rocher or Karcher. Try 14 day FREE trial from CloudTalk (no credit card details required).

The First and Still the Best in VoIP Communication! Our proprietary technology has been providing telecom services for over 20 years. XCast’s broad suite of products—Hosted IP-PBX, SIP Trunking, Carrier Services and Call Center Solutions—are available directly from XCastLabs or through our white label Resellers, our agent partners, carriers or call centers. XCast exceptional service, rates, and products meet the FCC standards for STIR/SHAKEN network compliance. XCast’s Hosted PBX solution is delivered over the Internet to any of your connected devices. Promotional plans start as low as $9.95 per month and include FREE Outbound minutes and a FREE Yealink Business Phone per extension. Sip Trunk Plans begin at $4.95 w/unlimited inbound minutes and free installation. Our Automatic Call Distribution (ACD) system has full reporting, automated customer callback, custom prompts, music on-hold, call recording, call monitoring (with whisper and barge-in), call transfer and more!

Thirdlane is a scalable UCaaS platform that blends multi-tenant PBX, Contact Center, and collaboration apps into one solution. MSPs, Enterprises, and telecom providers adopt Thirdlane when they want freedom of deployment, deep integrations, and reliable control over their communications stack. Whether your team prefers cloud-hosted services or on-premises deployments, Thirdlane adapts to your strategy. IT departments appreciate the API-first design, while business leaders value the ability to cut costs and avoid lock-in. Core benefits: - Enterprise-grade PBX with calling, video meetings, voicemail, and advanced routing. - Unified Thirdlane Connect apps for chat, video meetings, and file sharing. - Built-in Contact Center - Advanced analytics to improve service and sales. - CRM integration for context-rich customer interactions. - White-label branding across all user touchpoints. - Options for geo-redundancy and high availability.

Powerful Cloud Telephony for Global Businesses Zadarma offers a feature-rich VoIP platform designed for businesses that want flexibility, scalability, and professional communication without high costs. Set up your cloud PBX in minutes, manage international teams, and serve customers worldwide — all from a single interface. Key features: - Virtual phone numbers in 110+ countries - Free cloud PBX with IVR, call routing, and analytics - Integration with CRMs: HubSpot, Zoho, Bitrix24, and more - AI Voice Agent and AI-speech recognition and analytics - Apps for desktop, mobile, and browser-based calling - AI-powered voice agents and call tracking - Full control via web interface and API Ideal for remote teams, support centers, and growing companies looking to modernize their phone systems.

EnableX makes integrating real-time communications into applications and workflows a lot easier. Designed and developed for Service Providers, Systems Integrators, and Developers, it provides a robust, scalable and secure communications platform without the complexity of building and maintaining the network infrastructure. By simply leveraging on EnableX comprehensive sets of programmable APIs and SDKs, developers can rapidly customize and embed all or part of the communication functions – voice, video, SMS and chat – right into existing applications, workflows and systems. Together with the Virtual Number services and advanced features such as AI and NLP, businesses can reach customers globally with an outstanding communication experience.

Lowest priced phone and text service for your small and homebusiness. Why spend a bunch on phone solution for your business? A phone system made simple for everyone. TeliDesk is a self-serve platform that can be configured in as little as 15 minutes. Avoid hassling with phone systems that are complicated and take long to configure. Owning your own business means you’re in control, and your phone service is no exception. Virtual Office enables you to design your own telecom solution based on just what you need, nothing more and nothing less. Online Self-Service means you can easily make changes, anytime or anywhere. Just log in, and go! The more you call, the more you save. As your business grows, so does your discount. Automatic payments via credit card, debit card or PayPal. Prefer to pay cash? No problem. With no equipment to buy or install, our unique Virtual Office enables you to decide where calls ring. Our easy-to-use online interface lets you send calls to any existing phone

What is Talkroute? Talkroute is a UCaaS provider that gives you the ability to utilize your existing phones, web browser, and PCs with our cloud-based virtual phone system. Now you can have the power of an enterprise-level phone system without the upfront cost and maintenance of an expensive on-site system. Making and receiving business calls Our virtual phone system gives you the ability to make & receive calls from any desktop, browser, and smartphone. Texting with your customers Send and receive business SMS and MMS text messages. Our apps make it quick and easy to compose and reply to your customers. Video meetings with your team Video conferencing with up to 100 team & guest participants. Talkroute Meetings gives you the power to record meeting sessions, share your screen, chat via team messenger, collaborate using our whiteboard, & share files.

Hosted VoIP solution with a European focus and a local presence in over a 165 countries. As all our solutions are based on Premium Plus we give you the highest possible quality for the lowest price. All carry all types of numbers, from Geographic to National, TollFree and UIFN, Mobile VoIP, Elastic Pool solutions and much more. We also have our own Roaming products (physical and SIM solutions) too.