Best Telephony Software for On-Premises of 2025

A versatile platform and applications tailored for MSPs and UCaaS Providers. Elevate your business with contemporary communication and phone systems, enhancing customer experience without significant upfront expenses. Chosen by a multitude of global customers, UCaaS providers, and resellers, Thirdlane is the preferred solution for those seeking a competitive advantage. Whether for businesses of any scale, government agencies, or call centers, Thirdlane's reliable and user-friendly multichannel communication solutions boost productivity, customer engagement, sales, and cost efficiency. Discover how Thirdlane can bolster your organization; request a quote today. In addition to the telephony features of the Thirdlane Multi Tenant PBX or Thirdlane Business Phone System, customers gain entry to the Thirdlane Connect application (desktop&mobile), covering chat, voice and video calls, conferencing, screen sharing, along with integration capabilities with CRM and diverse applications.

VitalPBX is a unified communications PBX platform based on Asterisk (Centos 7). VitalPBX is a robust, scalable platform that will allow you to manage your PBX in a simple and intuitive manner. VitalPBX has a simple user interface and tooltips throughout the system. Telephony systems should be aware of security risks and take steps to avoid them. VitalPBX offers a variety of levels of protection against cyber threats in VoIP.

Toll-free and local numbers are available from more than 160 countries. Forward incoming calls from any phone, PBX, or SIP. Our global network offers multiple layers of redundancy. You can make international outbound calls by using any of your business numbers as a Caller ID. Showing a local caller ID will increase your success rate. To make outbound calls, connect our SIP trunks with your phone system. You can easily set up and modify smart calling routing features such as auto-attendant /IVR, location and time-based routing, and simultaneous ringback tones. Custom greetings, call recording, voicemail, and call recording are all possible. You can easily add or remove virtual numbers, modify calling plans, download call detail records and invoices, modify advanced features, and reach technical support 24/7. Contact your account manager.

Smartz Solutions is a disruptor that is reshaping contact center landscape. The traditional legacy systems have been holding businesses hostage too long with their complex infrastructures and high fees. Contact centers are tired from being burdened with disjointed, expensive systems that have a negative impact on customer and employee experience. Our AI-powered 360° experience platform is redefining contact centre experiences. We've been there. We paid for legacy systems. We had 15 systems running simultaneously (at snail's speed) to be able run our call center. We understand the frustration of not being able (sometimes even) to find data to help customers. We know how frustrating it is to have employee data scattered across multiple systems, never allowing a clear picture of the business. You don't have run your call center by losing money, opportunities, and patience. With a comprehensive tech stack you can finally have your entire customer base.

PBXware is the first and most established IP PBX Professional Open Standards Turnkey Telephony Platform. PBXware has been providing flexible, reliable and scalable Next Generation Communication Systems (NGCS) and VoIP solutions to small and medium-sized businesses (SMBs), enterprises and Internet Telephony Service Providers, (ITSPs), call centers and governments around the world since 2004. This is done by combining the best of the latest technologies. Bicom Systems softswitch is available in the Business, Call Center, and Multi-Tenant Editions. Each edition supports specific features that maximize performance, reliability, expandability, and expandability.

FreePBX stands as Freedom. FreePBX is the most popular open-source IP PBX in the world. It allows users to create a phone system that suits their needs. Open source communications is a powerful tool. Start building your phone system by taking a look at the many built-in features FreePBX offers. You can transform your FreePBX installation into a robust Unified Communications System with commercial modules from Sangoma or other add-ons. Visit the Knowledge Base at the FreePBX Wiki! FreePBX experts can help you with troubleshooting, installing, updating, and more. FreePBX is completely free to download and to use. Its power comes from a global network of developers who ensure that it remains a high-compatibility and customizable platform with all key features required to build a scalable business telephone system on any budget.

Intrado provides a cloud-based enterprise-grade calling solution that is fully hosted and managed. This includes team collaboration which includes messaging, meeting and mobility solutions as well as the benefits and features of Cisco Webex devices. VoiceMaxx CE also includes Cisco Hosted Collaboration Solution, (HCS), which is a cloud service that builds on Cisco's tried-and-true on-premises Call Manager offering. This makes it an ideal service choice for medium to large companies switching from a premise-based service. Intrado fully supports this solution with geo-redundant Data Centers, which provide enhanced business continuity and disaster recovery. Intrado engineers are available 24/7 to support you.

We unleash human momentum with collaboration, connectivity, and communications technology. All business is human—and when custom technology empowers human ingenuity, people and companies thrive. High performing teams do more, achieve more, and win more. Companies become agile, efficient, and resilient. Our team takes pride in making technology easy and cost effective. We love what we do—and it shows in the way we partner with you, from our first conversation to ongoing post-install support. Working with over 30,000 customer locations in 65+ countries, we deliver straightforward, secure, and scalable global managed services and advanced collaboration and communications solutions. Together let’s build your human momentum.

*astTECS IPPBX system is the ideal solution for any business, large or small. *astTECS PBX has all the top-end features at an affordable price and is TEC certified by DoT (Govt of India). *astTECS IPPBX solution allows your business to be flexible, innovative, competitive, and future-ready while reducing telecom expenses. *astTECS Call Center Dialer is an omnichannel contact centre solution that offers advanced features and a real-time dashboard for agent monitoring. Advanced analytics and AI-based call center dialer will improve agent productivity and customer engagement. *astTECS provides a complete call recording solution for your company. *astTECS voice recorder is easy to use and offers advanced features. Integration with any PBX is seamless. Supports ISDN/PRI, IP, analog lines and mobile to record all incoming and outgoing calls.

TekSIP for Windows is a SIP Registrar as well as a SIP Proxy. TekSIP supports UDP (IPv4 & IPv6), TCP (IPv4 & IPv6), TLS, and WebSocket transports. Only commercial editions support Secure WebSocket and TLS. TekSIP has been tested on Microsoft Windows Vista and Windows 7/8/10/11 servers. TekSIP is a signaling service for WebRTC based SIP-based phones. TekSIP is compliant with RFC 3261 and RFC 3263. It also complies to RFC 3581, RFC 3891, RFC 3311 and RFC 3481. It supports NAT traversal, ENUM. Please refer to Readme for technical details on NAT traversal. You can choose the IP address that will be listened to and alternative SIP endpoints when making outgoing calls. You can also log the session details in a log and monitor registrations and active sessions in real-time. Windows Performance Monitor (Perfmon.exe) allows you to monitor the number of active sessions and registrations. TekSIP redirects calls to an alternate endpoint if the called endpoint is not available (Offline, busy ...). GUI can be used to terminate an active SIP session.

OfficeConnect™, provides unified voice, conferencing and messaging as well as faxing. Our VoIP phones are more flexible and cheaper than legacy on-premises systems. You can keep your projects moving and synchronize teams with best-in class audio and video conference made easy. UniVoIP encrypts all voice traffic, both from remote and on-site telephones. It uses SRTP with 128 bit AES encryption. SRTP conforms to both the federal standards FIPS 140-2 Certified encryption and the Department of Defense's PKI Digital Certificate.

Asterisk is an open-source framework for building communication applications. Asterisk transforms an ordinary computer into a communications host. Asterisk powers IPPBX systems, VoIP gateways and conference servers, as well as other custom solutions. It can be used by small and large businesses, call centres, carriers, government agencies, and other agencies worldwide. Asterisk is open-source and free. Sangoma sponsors Asterisk. Today, more than 1 million Asterisk-based communication systems are in use in more than 170 nations. Nearly all Fortune 1000 customers use Asterisk. Asterisk is most commonly used by system integrators or developers. It can be used to create a complete business telephone system, enhance an existing system, or bridge between systems.

HoduPBX is the best solution for business communication. HoduPBX's unique user interface and optimal user experience allow businesses to communicate efficiently with their end users. This software provides unparalleled connectivity in an office environment and remote locations, making communication seamless. HoduPBX empowers agents' work management with multitasking capabilities and efficiency. Our IP PBX software is a great choice for business communications. It supports 1000+ concurrent calls and has 10,000 extensions. HoduPBX IP PBX Software offers various sophisticated features such as Add-on Modules, Reseller Module, SIP Trunking, Queue Pro, Voice Transcription, and Webphone. It also offers white label features across IOS, Android, Chrome Extension, Windows, Mac, Linux, and ZohoPhonebridge Plugin.

For over two decades, Diabolocom has been transforming customer engagement with our cloud-native Contact Center as a Service (CCaaS) solution. Powered by proprietary generative AI, Diabolocom delivers advanced automation, improved reachability, and actionable insights tailored to today’s customer service and sales demands. Our AI Assistant enhances each interaction through real-time transcription, satisfaction analysis, and predictive next-best-action guidance. What makes Diabolocom unique is our combination of native AI for CX and full telecom functionality, creating a hyper-customized telephony experience. By automating repetitive processes, teams can redirect their focus to driving customer loyalty and revenue growth. Our solution integrates natively or via API with CRMs such as Salesforce, Oracle, and Microsoft Dynamics, ensuring complete visibility across every touchpoint. Leading brands like Mitsubishi Electric, Nikon, and Brinks rely on Diabolocom to deliver differentiated, AI-optimized customer experiences. With 97% faster post-call handling and a 12% reduction in churn, our platform drives efficiency and keeps teams agile.

Virtual IP PBX (Private Branch Exchange), or Phone System Appliance – CompletePBX is the heart and soul of Xorcom's hardware and software telephone systems. It's built on top of Asterisk and Linux platforms and is designed for stability and high performance. CompletePBX was built from the ground up to offer ease-of-use, advanced features, and security at all levels. Get a fully functional, free CompletePBX 5 virtual machine evaluation now! CompletePBX certification training is available online for free. It will guide you through the basics of the system. You can save a lot of time and effort if you do it yourself. We can help you get there quicker.

Vodia is a software-based PBX that runs on Windows and Linux. It offers all the advanced features you would expect from a full-featured PBX, including call queues, auto attendants and call forwarding. Vodia is also the pioneer in Multi-Tenancy. You can host Vodia on a dedicated VM( Virtual Machine) in the cloud, premises, and maintain multiple FQDNs for each customer. Sign up for a hosted demo license code for 60 days.

Your business phone system on-premise that provides everything you need to provide great customer experiences. MiVoice Business is the core of Mitel's top-of-the-line on-site communication solution. It includes MiCollab, MiTeam Meetings, MiContact Center Business, and MiVoice Business. This allows employees to immediately benefit from unified mobile communications that are scalable, scalable, and scalable. It provides everything your business needs to take their communications to the next level. MiVoice Business can meet the needs of businesses with 5 to 130,000 users. It can be used at a single site, or in a multi-site network that spans across the globe. Software running on Mitel Collaboration Service Appliances is compatible with industry-standard x86 servers in a virtualized environment. This eliminates the need for multiple appliances to be supported, especially for customers who opt for centralized UC deployments.

You will see a rapid return on your investment through cost savings and improved operational efficiencies, as well as better customer service. With our Call Management System (CMS4), organizations can take control of their telephony expenses and receive detailed analytics on performance. CMS4 provides the information you need, in the format you want, whether you have a small system of a large network. CMS4 can be provisioned as an On-Prem or Cloud service, or as a complete managed service.

Taridium ipbx, a highly-capable software VoIP PBX system, replaces a traditional hardware-based PBX. ipbx can be run on standard server hardware or in the cloud. It does not require additional software licenses. An End User Panel allows you to manage all aspects of your extension. This includes listening to voicemail, setting up call forwarding, creating ad-hoc phone conferences, and more. You can set up your extension to forward only during certain times using your iCalendar feed, or based on a list favorite caller IDs. A conference room that is meet-me-type for all users. No more scheduling conflicts. Live conference management allows you to mute or kick participants. You can invite users by clicking a button, and the system will call them, instead of asking for cumbersome login instructions.

Softdial Contact Center™ is Sytel’s flagship suite of feature rich contact center applications and service. It is currently driving 50,000+ customers in 50+ countries. SCC's robust APIs can be customized, adapted, and white-labeled in order to meet any business needs. SCC manages all communication channels, including voice, chat, emails, and messaging, automatically blending and balancing contact between all agents, queues, and campaigns using its Automatic Session Distributor.

FusionPBX can be used to provide a highly-available single or domain-based multi-tenant VoIP, carrier-grade switch and call center server. It can also be used as a call center server. FreeSWITCH™, a multi-threaded, multiplatform communication platform, is highly scalable. It offers unlimited extensions, voicemail to email, music on hold and call parking. Call queues, phone provisioning, call center, call parking, and call center are all available. It offers the functionality you need and provides corporate-level phone system features for small, medium, and large businesses. It took a lot of time to fix bugs, tighten security, and improve the code. The future release is being worked on. We have made significant progress, and the master branch is now far ahead of the current release in many aspects. We are diligently working to complete the last changes required for this release.

AI-Powered Cloud Contact Center Solution. It powers innovative, personality-based routing. It also manages multichannel customer interactions in one conversation. Vocalcom is the world of digital engagement and artificial Intelligence (AI), where live agents are seamlessly integrated into the customer interaction flow. All customer interactions can be managed in one conversation. The new generation of cloud contact centre platform that integrates with existing systems and supports ALL channels. Vocalcom's intuitive user interface increases productivity and allows companies to weave all of their customer interactions across all channels into continuous conversation threads. This allows them to reduce customer effort while strengthening customer relationships with each interaction. Amazingly simple, adaptable, and powered by AI Keep the conversation going. All customer interactions, including chat, email, text message, phone, and social media, are available in one place.

Blueface VoIP phone system ensures that your business is ready for anything. You can make calls from any device, at any time, no matter if you are in the office, remote, or hybrid. Flexible, flexible cloud business phone system that scales to any size. Blueface is available now. Ascalable IP business phone system that will help your business grow. Reduce line rental and get up to 40% off your phone bill A business phone system that includes 60+ features, including IVR, Softphone (Mobile/Desktop), Console, Recording, and more. You can manage your communications through our self-service portal. A wide range of DECT hardware and accessories, from entry-level to executive levels. Blueface Unified Communications, Poly and unlimited audio conferences. Blueface Softphone App allows you to take your landline with your mobile phone. It also includes recording. Blueface offers a variety of continuity services to ensure you are always connected.

Unified Office, Inc., is a leader in providing SDN-based Hybrid Cloud services (trifecta of private cloud, on-premise, and public cloud) managed Voice over IP and Unified Communications services for small and medium-sized businesses (SMBs). Total Connect Now(sm), our service architecture, was designed from the ground up to provide the best experience and availability. It leverages the latest extensible business VoIP communications technology as well as cloud-based infrastructure to increase SMB workforce productivity. This unique architecture is the product of decades of combined experience in the telecommunications service provider as well as large enterprise data networking sectors. Our team is a business VoIP provider and has developed protocols, built scalable products, supported, integrated, deployed, and supported carrier-grade equipment in many of the largest converged network around the globe. Our core values are quality, dependability and innovation as well as support.

Everything you need to know about the FreeSWITCH platform. FreeSWITCH, a Software Defined Telecom Stack, enables the digital transformation of proprietary telecom switches into a flexible software implementation that runs on all commodity hardware. FreeSWITCH is able to unlock the telecoms potential of any device, from a Raspberry Pi to a multi-core Server. FreeSWITCH, when combined with SignalWire, a hosted cloud platform, can connect with the outside world and scale up to any size. The pre-built virtual machine includes both a written as well as a video how-to. You only need a copy virtualbox to get started. You can also follow these instructions if you are a skilled developer to compile the FreeSWITCH platform directly from source. If you have a spare Debian instance, you can follow this link to find detailed instructions on how to install our packages.