List of the Top 21 On-Prem Business Phone Systems in 2025

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.

Create a fully functioning contact center from scratch within a few hours by seamlessly integrating cloud capabilities with your existing on-premises infrastructure. Ozonetel enables a smooth transition from legacy systems to cloud solutions overnight, with our product specialists conducting a comprehensive evaluation of your requirements before proposing a customized solution that aligns with your organizational goals. Effectively merge and automate both digital and voice communication channels using industry-leading dialers to improve the handling of incoming leads and optimize outbound efforts. You can establish a complete call management system in 24 hours or even less, providing a wide range of inbound, outbound, and blended call center features. At Ozonetel, our secure cloud communication solutions not only enhance the customer experience but also lower overall operational costs for contact centers. As the pioneers of India's first cloud-based customer experience platform, we consistently set ourselves apart through exceptional customer support and continuous advancements in AI technology. Our dedication to maintaining high standards guarantees that we stay ahead in the industry, continually adapting to fulfill the evolving needs of our clients, ensuring their growth and success in a competitive market. By prioritizing innovation and customer satisfaction, we empower businesses to thrive in an ever-changing landscape.

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.

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.

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.

HoduPBX stands out as an exceptional choice for enhancing business communication. Its distinctive user interface, combined with an optimal user experience, ensures that businesses can interact efficiently with their clients and stakeholders. This software excels in providing seamless connectivity, whether in a traditional office setting or remote locations, thereby facilitating smooth communication. Additionally, HoduPBX enhances agents' productivity through its multitasking features and streamlined operations. As a robust IP PBX solution, it can handle over 1000 concurrent calls and accommodates up to 10,000 extensions, making it an ideal option for diverse business needs. The HoduPBX IP PBX Software is equipped with a range of advanced functionalities, including Add-on Modules, a Reseller Module, SIP Trunking, Queue Pro, Voice Transcription, and Webphone capabilities. Moreover, it supports white label options across various platforms such as iOS, Android, Chrome Extension, Windows, Mac, Linux, and the ZohoPhonebridge Plugin, ensuring versatility and adaptability for all types of users. This comprehensive feature set positions HoduPBX as a leading solution in the realm of business communication technologies.

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.

MikoPBX provides a robust phone system renowned for its high efficiency, remarkable reliability, and a wide array of features. Users can choose to implement it on-site via hardware setup or utilize it on various cloud services, including Google Cloud, Amazon Web Services, and Microsoft Azure. A standout aspect of MikoPBX is that it is offered as a free telephone solution, delivering all vital business functions without any associated costs. The user-friendly web interface is packed with functionalities such as call recording, conference calling, voicemail, call transfers, call pickup, call queues, an interactive voice response (IVR) setup, and customizable rules for inbound and outbound calls. Moreover, users can manage holiday schedules and set preferences for night-time calls effortlessly. The system's ability to incorporate globally developed plugins and modules further enhances its adaptability to meet specific business needs. A significant advantage of MikoPBX is its lack of user licensing fees, making it an affordable option for companies aiming to grow without the burden of additional costs for new personnel or call recording features. This capacity for scalable growth ensures that organizations can enhance their communication capabilities while keeping their infrastructure strong. Ultimately, MikoPBX stands out as an exemplary solution for businesses seeking both efficiency and cost-effectiveness in their communication systems.

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!

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.

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.

Unified Office, Inc. stands out as a leading Managed Services Provider offering Business Class Communication Services tailored for Small- and Medium-sized Enterprises. They deliver comprehensive business VoIP solutions that encompass a robust quality and support framework, initiating with engaging potential clients and progressing through a meticulous site survey, network evaluation, and the continuous cycle of integration, testing, deployment, and support. Their commitment extends to relentless monitoring of all service components, including on-premise systems, cloud infrastructures, software, and hardware, utilizing advanced diagnostic tools to ensure optimal quality and availability around the clock. At the core of their operations is a deep dedication to supporting their business clientele and resellers. Recently, the surge of interest in the Internet of Things (IoT) among large corporations has been noteworthy, prompting Unified Office to enhance its one-year-old IoT service offering, thereby expanding their innovative solutions portfolio. This strategic move reflects their understanding of market trends and the evolving needs of businesses in a technology-driven landscape.

CX-E seamlessly integrates with top communication platforms such as Avaya, Cisco, Microsoft, Mitel, and NEC, whether installed on-premises or utilized in the Cloud, significantly enhancing existing telephony and email infrastructures. It features cutting-edge capabilities, including end-to-end encryption for voice messages, ensuring maximum security. Users can take advantage of a mobile application that offers single number reach, smart call forwarding, clear delineation between personal and business calls, inbound call screening, and safeguarding of personal mobile numbers. The system effectively compiles voicemail, email, and fax into a single inbox, simplifying user access. Additional functionalities include text-to-speech, voicemail transcription, and secure messaging options. With speech-enabled technology, individuals can manage their calendars, emails, faxes, and voicemails without needing to use their hands or eyes. Moreover, the federated presence feature allows users to set personalized greetings that reflect their calendar schedules. CX-E supports multiple attendants, incorporates speech recognition interfaces, offers customizable greetings for various departments, provides multilingual support, and allows for scheduled messages. It also facilitates personalized automated outreach via phone calls or text messages, boosting communication efficiency overall. This all-encompassing solution is meticulously engineered to enhance communication workflows and significantly elevate productivity levels in any organization. Furthermore, its versatility ensures that businesses of all sizes can tailor the system to meet their specific needs and improve their operational effectiveness.

In today's digital landscape, maintaining connections goes beyond just voice calls. Verge's Business VoIP Phone Systems are packed with features and provide the option of either On-Premises installation or a Verge Dedicated private Cloud setup. Our VoIP offerings are crafted to align with your unique business requirements and financial constraints. They not only reduce overall costs but also incorporate the advanced functionalities typical of contemporary phone systems into your operations. Additionally, Verge's Unified Communication Solutions present a comprehensive array of tools aimed at enhancing teamwork and boosting efficiency. By seamlessly merging voice, data, video, and mobile applications into a unified platform, we empower your team to communicate and collaborate from virtually anywhere at any time. Our customized solutions will not only keep your business competitive but also encourage innovation while enhancing customer interactions significantly. In this fast-paced environment, adapting to modern communication demands is essential for sustained growth and success.