List of the Top 25 On-Prem Business VoIP Providers in 2025

Discover the ideal VoIP service tailored for those aiming to enhance their office or mobile communication capabilities. At TecWerks, we present a distinctive alternative to traditional telecom providers. Our solutions are designed to accommodate businesses of all sizes, from small startups to expansive multi-site enterprises, without the unexpected expenses. With our telecom plans, you can significantly reduce your phone service costs. Transparency is key, and we ensure there are no hidden fees. If you occasionally need to step away from the office, our VoIP systems are compatible with mobile devices, ensuring you won’t miss critical calls even when you're on the go, regardless of whether your cell number is public. If your team includes remote workers or staff in the field, we've got you covered with solutions that cater to your specific requirements. We specialize in customizing telecom packages to fit the unique needs of your business. VoIP (voice over IP) technology is fully portable, allowing for both cost savings and improved accessibility for your operations. From basic offerings to sophisticated cloud-based voice solutions, we provide a comprehensive range of options to meet all your communication needs, ensuring your business stays connected seamlessly. Additionally, our commitment to customer support means you can always rely on us when you need assistance.

A dynamic platform and specialized applications designed specifically for MSPs and UCaaS Providers. Transform your business with modern communication and telephony systems that improve customer interactions while minimizing upfront investments. Widely adopted by numerous international clients, UCaaS providers, and resellers, Thirdlane stands out as the go-to solution for those aiming to gain a competitive edge. Whether serving enterprises of various sizes, governmental organizations, or call centers, Thirdlane's dependable and intuitive multichannel communication solutions enhance productivity, foster customer engagement, drive sales, and improve cost-effectiveness. Explore how Thirdlane can strengthen your organization by requesting a quote today. Additionally, alongside the telephony features offered by the Thirdlane Multi Tenant PBX or Thirdlane Business Phone System, customers also enjoy access to the Thirdlane Connect application (available on both desktop and mobile), which encompasses chat, voice and video calls, conferencing, screen sharing, and seamless integration with CRM systems and various applications, providing a comprehensive communication experience. This robust array of features is designed to meet the evolving needs of today's businesses.

PBXware stands out as the original and most prominent IP PBX Professional Open Standards Turnkey Telephony Platform available today. Since its inception in 2004, PBXware has been delivering adaptable, dependable, and scalable Next Generation Communication Systems (NGCS) alongside VoIP solutions tailored for small and medium-sized businesses (SMBs), large enterprises, Internet Telephony Service Providers (ITSPs), call centers, and various governmental agencies across the globe. This achievement is realized by integrating the finest elements of cutting-edge technologies. The Bicom Systems softswitch is offered in several editions, including Business, Call Center, and Multi-Tenant, with each edition designed to support specific features that enhance performance, reliability, and expandability, ensuring users get the most out of their systems. This versatility makes PBXware a preferred choice for organizations seeking robust telephony solutions.

Safeguard your conversations by ensuring that your VoIP calls are both encrypted and protected against eavesdropping. If maintaining privacy during your discussions is important to you, our free encryption services cover all forms of communication—text, voice, and video—leveraging TLS/SRTP and ZRTP protocols. Our VoIP softphone effortlessly merges with your contacts, allowing for easy access to a unified list pulled from various platforms like Outlook, Windows, Mac, LDAP, XMPP, XCAP, as well as mobile devices such as Android and iOS. Additionally, you can quickly recognize incoming calls prior to answering, which enhances your overall communication experience. Zoiper is designed to work across a broad spectrum of operating systems, including macOS, Linux, and Windows, while also being compatible with iOS, Android, and web browsers. We are dedicated to ongoing enhancements of our services and expanding our compatibility options. Forget about the complicated terminology; our solution integrates Audio, Video, Fax, Presence, and Instant Messaging, all through a streamlined interface that prioritizes user-friendliness. With Zoiper, you can communicate with confidence and effectiveness across numerous platforms, making your interactions more secure and enjoyable. Our commitment to user satisfaction drives us to keep evolving and adapting to your needs.

The *astTECS IPPBX system serves as the perfect solution for businesses of all sizes, ensuring a comprehensive set of high-end features at a reasonable cost while holding TEC certification from the Government of India. This innovative PBX solution empowers organizations to be adaptable, forward-thinking, and competitive, all while streamlining telecom costs. Additionally, the *astTECS Call Center Dialer stands out as an omnichannel contact center solution, featuring a sophisticated real-time dashboard to monitor agents effectively. With the incorporation of advanced analytics and AI-driven capabilities, this dialer significantly enhances both agent productivity and customer interactions. Furthermore, *astTECS offers a robust call recording solution tailored for your business needs, with an intuitive voice recorder that boasts a range of advanced functionalities. Seamless integration with various PBX systems is a key benefit, as it supports ISDN/PRI, IP, analog lines, and mobile networks, ensuring comprehensive recording of all incoming and outgoing calls. This all-in-one solution not only optimizes communication but also facilitates better decision-making through detailed call insights.

Toll-free and local numbers are offered in over 160 nations, allowing you to forward incoming calls from any phone, PBX, or SIP system. Our extensive global network is designed with multiple layers of redundancy to ensure reliability. You can utilize any of your business numbers as Caller ID for international outbound calls, and displaying a local caller ID can significantly enhance your success rates. To facilitate outbound calling, simply connect our SIP trunks to your existing phone system. Implementing smart calling routing features like auto-attendant/IVR, time-based routing, and simultaneous ringback tones is straightforward. You also have the flexibility to customize greetings, record calls, manage voicemail, and access call recording functionalities. Adjustments to virtual numbers, calling plans, and advanced features can be done effortlessly, while you can also download call detail records and invoices. Technical support is available around the clock, ensuring assistance whenever you need it. For personalized help, reach out to your dedicated account manager. Additionally, our user-friendly interface allows you to manage all aspects of your communication seamlessly, enhancing your overall experience.

Experience a comprehensive and high-quality VoIP service tailored to meet all your business requirements, available nationwide and proudly operated from Southern Utah at competitive prices to foster your business growth. Joining is simple: visit our website, choose the number of phones you need, and receive a copy of your bill while we manage everything from installation to user training. We are committed to demonstrating our affordability by matching competitor quotes. Our confidence in our service is reflected in our no-contract policy, allowing our quality to shine through. All features are included in our pricing, with various bundles and packages available. Enjoy unlimited calls, SMS, EFax capabilities, detailed dashboards, performance analytics, and call recording services. Additionally, we offer professional voice recordings, ring groups, call flow management, advanced IVR systems, mass messaging, voicemail transcription, and call logs. With 24/7 customer service, we ensure that help is always just a call away for our valued clients. You can trust us to elevate your communication experience with unmatched reliability and support.

We drive human progress through teamwork, connectivity, and advanced communication technologies. Every aspect of business revolves around people, and when tailored technology enhances human creativity, both individuals and organizations flourish. Teams that excel accomplish greater feats, reach higher goals, and experience increased success. Organizations become more agile, efficient, and adaptable to change. Our team is dedicated to simplifying technology and keeping it affordable. Our passion for our work is evident in how we collaborate with you, starting from our initial discussion and continuing with ongoing support after installation. Serving over 30,000 customer locations across more than 65 countries, we provide clear, secure, and scalable global managed services along with sophisticated collaboration and communication solutions. Let's work together to enhance your human potential and foster innovation. By combining our expertise with your vision, we can create remarkable outcomes.

Intrado offers a comprehensive cloud-based calling solution designed for enterprises that is entirely managed and hosted. This service encompasses team collaboration features such as messaging, meetings, and mobility options, along with the advantages of Cisco Webex devices. Additionally, VoiceMaxx CE integrates the Cisco Hosted Collaboration Solution (HCS), a cloud service that builds upon the established on-premises Call Manager system provided by Cisco. This makes it an excellent option for medium to large businesses transitioning from traditional on-premise services. The solution is backed by Intrado's geo-redundant Data Centers, ensuring superior business continuity and disaster recovery capabilities. Furthermore, Intrado’s engineering team is on hand around the clock to provide support and assistance whenever needed. This level of support is crucial for maintaining seamless operations in a dynamic business environment.

Designed for both large enterprises and emerging companies, the Yay.com business phone system presents a flexible and innovative communication platform that not only cuts costs but also enhances organizational adaptability. With user-friendly softphone applications compatible with your existing devices, remote and hybrid work becomes effortless and efficient. You can collaborate and communicate from anywhere in the world, allowing you to operate in a manner that suits your needs best. Yay excels in supporting distributed teams, whether they are in the office, at home, or on the move. Take advantage of a wide array of business functionalities, including CRM integrations, IVR call menus, call queuing, and much more. Start with a free trial today and discover how Yay.com can empower your business to flourish and succeed. Additionally, with its comprehensive tools and features, you can optimize your team's performance and improve customer interactions effectively.

Ajoxi specializes in offering wholesale VoIP termination services. To guarantee dependable service and superior connectivity, they utilize state-of-the-art routers and equipment. Additionally, Ajoxi employs a team of skilled technicians who actively monitor the system and promptly address any issues that occur, ensuring uninterrupted performance. Their commitment to quality and reliability sets them apart in the industry.

OfficeConnect™ offers a comprehensive solution that integrates voice, conferencing, messaging, and fax services. Our VoIP phones present a more adaptable and cost-effective alternative to traditional on-premises systems. With our advanced audio and video conferencing capabilities, you can ensure that your projects stay on track while keeping your teams in sync effortlessly. UniVoIP takes security seriously by encrypting all voice communications, whether from remote locations or on-site telephones. It employs SRTP with 128-bit AES encryption, meeting the stringent requirements of federal standards, including FIPS 140-2 Certified encryption and the Department of Defense's PKI Digital Certificate, thereby providing an additional layer of trust in your communications. This commitment to security and functionality makes OfficeConnect™ a reliable choice for modern businesses.

Explore a vast selection of communication options all conveniently situated in one location. Partner with Traverse Telecom to ensure your customers can connect with ease! Boost your business infrastructure with exceptional phone connectivity designed to enrich customer interactions. Welcome your clients with a dependable telephone service, regardless of your work location. Broaden your reach and engage with clients around the globe using our exceptional International toll-free 800 numbers. Interested in accessing international markets? Unlock new avenues for your business by utilizing our Direct Inward Dialing (DID) services, available in more than 90 countries. Don't allow important business chances to pass by because of unanswered calls; our call forwarding service enables you to route customer inquiries to your chosen business site according to your needs. We provide all-encompassing Cloud PBX Solutions, removing the necessity for conventional on-site systems. With Cloud PBX, you obtain unmatched flexibility and control, alongside an impressive range of advanced features that can enhance your operations significantly. Embrace the modern era of communication, and watch your enterprise flourish while adapting to evolving market demands. The right communication solutions can make all the difference in ensuring your business remains competitive and responsive.

My Country Mobile provides affordable and user-friendly VoIP solutions that are truly exceptional. Experience a range of features with our 30-day, no-risk trial of the premium VoIP phone system. Our goal is to help families and friends maintain connections across distances by utilizing advanced technology and intelligence. We strive to enhance both personal and professional relationships with simplicity and effectiveness. With extensive knowledge and expertise, our team is dedicated to delivering top-notch results that surpass our clients' expectations. We are excited about the prospect of expanding our services and achieving further growth. With decades of experience in crafting technologies and solutions that enhance communication and sharing for businesses and individuals globally, My Country Mobile has established itself as a frontrunner in the innovation of such technologies and services. As we continue to evolve, we remain committed to fostering connectivity in an increasingly digital world.

For more than twenty years, Diabolocom has been revolutionizing the way businesses engage with their customers through its innovative cloud-native Contact Center as a Service (CCaaS) platform. Utilizing exclusive generative AI technology, Diabolocom offers sophisticated automation, enhanced accessibility, and insightful analytics designed to meet the evolving requirements of customer service and sales. The AI Assistant provided by Diabolocom enriches each customer interaction by delivering real-time transcription, evaluating satisfaction levels, and offering guidance on the most effective next steps to take. What sets Diabolocom apart is the seamless integration of native AI focused on customer experience alongside comprehensive telecom capabilities, resulting in a highly personalized telephony service. By streamlining repetitive tasks, organizations can shift their attention towards fostering customer loyalty and enhancing revenue generation. Our solution can be integrated either natively or through APIs with popular CRM platforms such as Salesforce, Oracle, and Microsoft Dynamics, guaranteeing thorough visibility across all customer interactions. Esteemed brands like Mitsubishi Electric, Nikon, and Brinks trust Diabolocom to provide unique, AI-enhanced customer experiences. With a remarkable 97% reduction in post-call handling times and a 12% decrease in customer churn, our platform not only boosts operational efficiency but also empowers teams to remain adaptable in a fast-changing market landscape. This commitment to innovation is why Diabolocom continues to lead the industry in customer engagement solutions.

CompletePBX, Xorcom's core telephone system solution, serves as a Virtual IP PBX (Private Branch Exchange) or Phone System Appliance, integrating Asterisk and Linux to ensure robust stability and high operational performance. Developed with user-friendliness, advanced functionalities, and comprehensive security in mind, CompletePBX is designed to meet the diverse needs of modern communication. You can access a fully functional evaluation of the CompletePBX 5 virtual machine at no cost! Additionally, free online certification training for CompletePBX is offered, providing a foundational understanding of the system that can significantly streamline your learning process. With our assistance, you can expedite your journey to mastering this powerful phone system.

A VoIP solution crafted in Canada specifically for businesses with five or more users. Our team of VoIP specialists is dedicated to assisting you in selecting the ideal mix of hardware endpoints, network equipment, and ISP connections tailored to your unique location. With our service, your organization can effortlessly maintain clear communication with clients consistently, ensuring that every call sounds impeccable. We prioritize your connectivity needs and strive to enhance your overall communication experience!

Pulse stands out as a premier provider of innovative call center solutions, with its Web Real-Time Communication significantly boosting operational efficiency in call centers. With a rich history spanning more than twenty years in the call center sector, Pulse has successfully assisted clients across India, North America, and Europe in creating smooth and effective customer interactions. The company’s tailored call center solutions, which incorporate cutting-edge features, not only streamline the customer journey but also enhance revenue generation and foster customer loyalty. By focusing on meeting the unique needs of businesses, Pulse ensures that clients receive solutions that are well-suited to their requirements. Additionally, these advanced features promote proactive engagement with customers, ensuring they enjoy an outstanding user experience and reinforcing long-term relationships. Ultimately, Pulse is committed to helping businesses thrive in a competitive landscape through its expertly crafted solutions.

Effortlessly manage your business communications without needing any technical skills, thanks to VoIPline Telecom's user-friendly phone system. This system offers complete visibility into your communications through an intuitive visual block diagram accessible from any web browser. With a simple drag-and-drop interface, you can easily place more than 30 telephony configuration tools onto the canvas, allowing you to customize your setup according to your specific needs and preferences. You have the ability to adjust the incoming call flow by linking different objects, making the entire process visually clear for anyone, even those who are not technically inclined; every aspect of how an incoming call is handled is presented in an easily understandable manner. Additionally, you can create multiple distinct canvases organized by tabs to manage various call logics, which minimizes the risk of confusion that can occur when too many elements clutter a single canvas. This adaptability guarantees that your business communications remain efficient and well-organized at all times, empowering you to focus on what truly matters—growing your business.

Vodia is a PBX solution that operates on both Windows and Linux platforms, delivering a comprehensive suite of advanced functionalities typically associated with robust PBX systems, such as call queues, auto attendants, and call forwarding capabilities. Additionally, Vodia stands out as a leader in Multi-Tenancy, allowing users to deploy it on a dedicated virtual machine in the cloud or on-site while managing numerous fully qualified domain names for different clients. You can experience Vodia by signing up for a free demo license, valid for 60 days, to explore its features firsthand. This trial is an excellent opportunity to see how Vodia can cater to your specific telecommunication needs.

The on-premises business phone system that offers all the vital tools needed for your organization to improve customer engagement. Central to Mitel's top-tier on-site communication solutions is MiVoice Business, which encompasses MiCollab, MiTeam Meetings, and MiContact Center Business, enabling staff to enjoy the advantages of integrated, scalable, and mobile communications effortlessly. This system provides your organization with everything required to raise communication standards through efficient mobility, collaborative teamwork, video conferencing, and exceptional customer experience management. MiVoice Business is designed to serve businesses of varying sizes, from 5 to 130,000 users, whether they operate from a single venue or multiple locations across the globe. Additionally, the software deployed on Mitel Collaboration Service Appliances can function on standard x-86 servers within a virtual environment, simplifying processes by minimizing the need for numerous devices—this is particularly beneficial for clients choosing a centralized unified communications approach. With MiVoice Business, companies can guarantee that their communication framework is both adaptable and strong, promoting continuous growth and innovation. Ultimately, this comprehensive solution empowers organizations to meet the ever-evolving demands of modern communication.

Achieve a rapid return on investment through improved cost savings, streamlined operations, and superior customer service. Our Call Management System (CMS4) provides organizations with the necessary tools to effectively oversee their telephony costs, complete with comprehensive performance analytics. Whether managing a small setup or an expansive, international network, CMS4 delivers critical insights in your desired format. The system can be implemented as an On-Premises solution, a Cloud-based option, or as a fully managed hosted service. CMS4 allows users to scrutinize traffic at every gateway or trunk group, producing grade of service reports that indicate whether capacity meets current demand. By utilizing this information, organizations can ensure their systems run efficiently to meet existing requirements while also preparing for future growth. This flexibility not only maximizes resource utilization but also equips businesses to thrive in an evolving market landscape. As a result, adopting CMS4 can significantly enhance an organization's strategic positioning for long-term success.

The Yeastar K2 IPPBX can be accessed in both hardware and software formats, accommodating up to 2000 users, managing 500 simultaneous calls, and supporting 400 VoIP trunks across various sites. This flexibility makes it an excellent choice for medium to large businesses that require robust communication solutions. Designed to cater to the evolving demands of modern communication, the Yeastar K2 IPPBX provides advanced enterprise features along with remarkable reliability. Additionally, it facilitates remote work environments through the innovative Linkus UC Softphone, ensuring seamless connectivity for users regardless of their location. By incorporating this technology, companies can enhance their operational efficiency and improve collaboration among team members.

The Horizon phone system is an all-encompassing communication solution that provides an extensive range of both landline and mobile telephony capabilities via an intuitive web interface. As the foremost cloud telephony choice available in the market, Horizon features a robust set of tools tailored to meet the requirements of businesses, regardless of their size or structure. Cavendish has established itself as a leader in delivering the Horizon system, gaining deep knowledge in its setup, installation, training, and support for diverse phone system configurations that today’s enterprises need. With the ability to implement auto attendant functionalities, organizations can enhance call routing efficiency by offering callers various menu options to choose from. Moreover, users enjoy the convenience of accessing their phone numbers and adjusting settings from any authorized device within the company, which significantly boosts communication flexibility and operational efficiency. This level of adaptability positions Horizon as an essential resource for contemporary businesses striving to refine their telephony strategies while also promoting seamless connectivity across teams and clients. Ultimately, the combination of advanced features and user-centric design ensures that businesses can remain competitive in an increasingly digital landscape.

Our cloud-based phone solutions include ITC Cloud, which offers high-definition video conferencing, chat capabilities, and recording options, alongside standard VoIP services. This comprehensive system is perfect for fostering communication with clients and colleagues in online environments. Are you ready to boost your productivity and teamwork? Embrace this innovative approach to transforming your communication strategy.