Best On-Premises Telephony Software
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Compare the Top On-Premises Telephony Software as of November 2025
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What is On-Premises Telephony Software?
Telephony software is a type of communication technology that enables voice and video communication over telephone systems, computers, and the internet. These platforms are designed to manage, route, and track phone calls, messages, and multimedia communications within businesses or personal environments. Features of telephony software often include VoIP (Voice over Internet Protocol) support, call routing, interactive voice response (IVR), voicemail, call recording, and integration with customer relationship management (CRM) systems. Many telephony systems also include analytics tools for tracking call volumes, durations, and customer interactions. By improving communication efficiency and providing scalable solutions, telephony software is crucial for businesses looking to streamline their communication infrastructure. Compare and read user reviews of the best On-Premises Telephony software currently available using the table below. This list is updated regularly.
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1
Thirdlane
Thirdlane
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. -
2
PBXware
Bicom Systems
PBXware is the world’s first and most mature IP PBX Professional Open Standards Turnkey Telephony Platform. Since 2004, PBXware has deployed flexible, reliable, and scalable Next Generation Communication Systems and VoIP solutions to Small and Medium sized Businesses (SMBs), enterprises, Internet Telephony Service Providers (ITSPs), Call Centers and governments worldwide by combining the most advanced of the latest technologies. Bicom Systems’ softswitch is offered in the Business, Call Center and Multi-Tenant Editions, each supporting specific features maximizing performance, reliability, and expandability. -
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Global Call Forwarding
Global Call Forwarding
Buy toll-free numbers and local phone numbers from more than 160 countries without commitment. You can route incoming calls to any phone, PBX, or SIP worldwide. Our global network has multiple layers of redundancy. Make international outbound calls and show any of your business phone numbers as Caller ID. Connect our SIP trunks to your phone system or use the GCF softphone to make outbound calls. Easily set up and modify smart call routing features like auto-attendant / IVR, location & time-based routing, local ringback tones, simultaneous ring, customized greetings, call recording, voicemail, and more. Easily add or remove virtual numbers, change calling plans, download your invoices and call detail records, modify advanced features, reach live technical support 24/7, and contact your account manager.Starting Price: $7.95 per month -
4
Smartz Solutions
Smartz Solutions
Smartz Solutions is the disruptor reshaping the contact center landscape. Traditional legacy systems, with their entangled infrastructures and exorbitant fees, have held businesses hostage for too long. Contact centers are tired of being burdened by disjointed systems with hefty price tags and bad customer and employee experiences. We’re redefining the contact centre experience through our AI-powered 360-degree experience platform. We’ve been there. We paid for the legacy systems. We had 15 different systems running (at a snail's pace) at once to be able to run our call centre. We know the pain of not being able to find data quickly enough (sometimes at all) to help customers. And we sure know what it’s like to have employee information in multiple systems; never showing a clear view of the business. Losing money, opportunities and patience doesn’t have to be how you continue to run your call centre. Through a comprehensive tech stack, you will finally have your entire customStarting Price: $55.00/month/user -
5
Voicemaxx CE
Intrado
An enterprise-grade cloud-based calling solution fully hosted and managed by Intrado, with the added benefit of team collaboration, which includes: messaging, meeting, and mobility solutions and the features and benefits of Cisco Webex devices. VoiceMaxx CE includes Cisco Hosted Collaboration Solution (HCS), a cloud service that builds upon Cisco’s tried and true on-premises Call Manager offering, making it an ideal service for medium to large organizations switching from a premise-based service or those with Cisco infrastructure already in place. This solution is fully supported by Intrado with geo-redundant data centers—providing enhanced business continuity and disaster recovery—and 24/7 monitoring and support from Cisco-certified engineers.Starting Price: $25.00/month/user -
6
FreePBX
Sangoma Technologies
The “Free” in FreePBX stands for Freedom. That’s because FreePBX, the world’s most popular open source IP PBX, gives users the tools to build a phone system tailored to their needs. Discover the power of open source communications. Take a look at all the built-in features FreePBX has to offer and start building your phone system. Transform your FreePBX install into a robust Unified Communications system with commercial modules from Sangoma and other add-ons for FreePBX. Visit the Knowledge Base on the FreePBX Wiki! Or let FreePBX experts assist with support for installing FreePBX, updating, troubleshooting, and beyond. Completely free to download and use, the power of FreePBX comes from a global community of developers who ensure it remains a high compatibility and customizable platform with all the key features needed to build a scalable business phone system on any budget. -
7
VitalPBX
VitalPBX
VitalPBX is a unified communications PBX system based on Asterisk and Linux (Centos 7). VitalPBX provides a robust and scalable platform, which will allow you to manage your PBX in an easy and intuitive way. VitalPBX is built to be easy to use with tooltips across the system and a coherent user interface throughout. A telephony system should be aware of security hazards and avoid them. VitalPBX offers various levels of protection against cyber threats in the VoIP world.Starting Price: $100 -
8
TekSIP
KaplanSoft
TekSIP is a SIP Registrar and SIP Proxy for Windows. TekSIP supports UDP, TCP, TLS and WebSocket (IPv4 & IPv6) transports. TLS and Secure WebSocket are supported in only commercial editions. TekSIP is tested on Microsoft Windows Vista, Windows 7/8/10/11 and Windows 2008-2022 server. TekSIP can be deployed as a signaling server for WebRTC based SIP phones. TekSIP complies with RFC 3261, RFC 3263, RFC 3311, RFC 3581 and RFC 3891. It supports NAT traversal and ENUM. Please see technical details about NAT traversal in Readme. You can select IP address to be listened and alternative SIP endpoints for outgoing calls. You can also log session details into a log file and monitor active registrations and sessions in real-time. You can monitor number of active registrations and sessions using Windows Performance Monitor (Perfmon.exe). TekSIP can redirect calls to alternate endpoint when called endpoint is unavailable (Off-line, busy...). Active SIP session can be terminated via GUI.Starting Price: $239 -
9
Issabel
Issabel
Issabel is an open source unified communications platform that consolidates IP communication services into a single system, surpassing the constraints of a conventional PBX by integrating features such as call center capabilities, email, management reports, fax, video call meetings, audio recording, and CRM and platform integrations. It offers a robust, flexible, and easy-to-use call center module designed to efficiently automate and manage contact centers, handling both incoming and outgoing call campaigns through an intuitive agent console and call management interface. Issabel streamlines PBX solutions for service providers, enabling the management of multiple clients from a single instance, simplifying administration without the need for separate servers for each client. To enhance functionality, Issabel supports add-ons crafted to seamlessly integrate with the platform, adding features that interact with telephony to improve customer service and automate actions for support.Starting Price: Free -
10
OfficeConnect
UniVoIP
OfficeConnect™ provides unified voice, conferencing, messaging, fax, and more. Our state-of-the-art VoIP phones are far more flexible and cost-effective than legacy on-premises systems. Keep your projects moving and synchronize your teams with best-in-class audio and video conferencing made simple. UniVoIP encrypts all voice packets—from both remote and on-site phones—using SRTP with 128-bit AES encryption. SRTP is compliant with both the federal standards for FIPS 140-2 Certified Encryption and the Department of Defense’s PKI Digital Certificate.Starting Price: $18.95 per user per month -
11
Asterisk
Sangoma Technologies
Asterisk is an open source framework for building communications applications. Asterisk turns an ordinary computer into a communications server. Asterisk powers IP PBX systems, VoIP gateways, conference servers and other custom solutions. It is used by small businesses, large businesses, call centers, carriers and government agencies, worldwide. Asterisk is free and open source. Asterisk is sponsored by Sangoma. Today, there are more than one million Asterisk-based communications systems in use, in more than 170 countries. Asterisk is used by almost the entire Fortune 1000 list of customers. Most often deployed by system integrators and developers, Asterisk can become the basis for a complete business phone system, or used to enhance or extend an existing system, or to bridge a gap between systems. Build your own custom system with Asterisk? Buy a powerful, low-cost turnkey system based on Asterisk? Discover which option is right for you.Starting Price: Free -
12
HoduPBX
Hodusoft
HoduPBX is the ultimate solution for business communication. Its unprecedented user interface with optimal user experience facilitates businesses to communicate with the end users efficiently. This software offers world-class connectivity within an office and from the remote location leaves communication an uninterrupted process. Get HoduPBX and empower agents’ work management with multitasking abilities and efficiencies. With 1000+ concurrent calls and 10,000 extensions, our IP PBX software is one of the best choices for business communications. Here are HoduPBX’s key features: Multi-Tenant Auto Provisioning Least Call Routing (LCR) Real-time Analytics and Reports Queue Monitoring Multi-level IVR BLF & Presence Prepaid & Postpaid Billing Payment Gateway Integration Audio-conferencing SMS Hosted IP PBX Software -
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Diabolocom
Diabolocom
For 20+ years, Diabolocom has redefined customer engagement. Our cloud-based Contact Center as a Service (CCaaS), powered by our proprietary generative AI, provides the smart automation, reachability, and insights today’s customer service and sales teams need. From real-time transcription and satisfaction analysis to next-best-action recommendations, our AI Assistant seamlessly supports each customer interaction for faster resolutions. Diabolocom combines native AI for CX with telecom services to deliver a unique, hyper-customized telephony experience. By automating routine tasks, your teams focus on what truly matters—driving customer loyalty and growth. We integrate smoothly with CRMs like Salesforce, Oracle, and Microsoft, giving teams full visibility to fuel business growth. Industry leaders like Mitsubishi Electric, Nikon, and Brinks trust Diabolocom for customer experiences that stand out. -
14
CompletePBX 5 IP PBX
Xorcom
Virtual IP PBX (Private Branch Exchange) or Phone System Appliance – CompletePBX is the heart of Xorcom hardware and software phone systems. Built on top of the solid Linux and Asterisk platforms, it’s built for stability and performance. CompletePBX was designed from the ground up to combine ease of use, advanced features and security at every level. Download free, fully functional CompletePBX 5 VM – evaluation virtual machine now! Check out our FREE online certification training course that will take you step by step through all the basics of CompletePBX system. Save a lot of time and effort by trying to go at it alone. Let us help you get there faster. -
15
FusionPBX
FusionPBX
FusionPBX can be used as a highly available single or domain-based multi-tenant PBX, carrier-grade switch, call center server, fax server, voip server, voicemail server, conference server, voice application server, appliance framework and more. FreeSWITCH™ is a highly scalable, multi-threaded, multi-platform communication platform. It provides unlimited extensions, voicemail-to-email, music on hold, call parking, call center, call queues, phone provisioning and many other features. It provides the functionality your business needs and brings corporate-level phone system features to small, medium and large businesses. A large amount of time has been used to fix bugs and tighten security and improve the code. There is also progress being made on the future release. We have made a good amount of progress and the master branch is far ahead of the current release in many ways. We are working diligently to finish the last changes that we feel are needed for this coming release.Starting Price: $100 per month -
16
Vodia PBX
Vodia Networks
Vodia Networks offers a SIP PBX platform that runs smoothly across cloud, on-premise, and hybrid setups. Our PBX supports a broad range of devices, including SIP phones, softphones, and WebRTC clients, to help businesses communicate flexibly across locations. Our Session Border Controller (SBC) has been certified by Microsoft for Microsoft Teams, and our PBX features AI-powered real-time call transcription using OpenAI’s Whisper technology. Vodia supports easy deployment through prepaid cloud PBX instances and traditional installations across various environments. Our phone system integrates with some of the world’s best business software, including ActiveCampaign, CallSmart, Cliniko, HighLevel, Microsoft Dynamics 365, monday.com, Shiji PMS, UPilot, and other industry-standard business communications platforms, so our customers can deploy cutting-edge business tools alongside our best-in-class, feature-rich cloud phone system. -
17
Blueface Hosted PBX
Blueface
Blueface VoIP phone system keeps your business ready for anything. Take calls on any device, anywhere, whether you’re remote, office or hybrid working. Scalable, flexible cloud business phone system for businesses of any size. Get started with Blueface today. Scalable IP business phone system that helps your business grow. Cut line rental and save up to 40% on your phone bill. Business phone system with 60+ features with IVR, Softphone (Mobile / Desktop), Console, Recording and more. Our self-service web portal puts you in control of your communications. Wide range of desk / DECT hardware and accessories that range from entry to executive level. Unlimited, crystal clear audio conferences powered by Blueface Unified Communications and Poly. Take your landline with you on your mobile phone with the Blueface Softphone App that also features recording. Blueface offers a range of continuity services so you’re always connected. -
18
MiVoice Business
Mitel Networks
The on-premise business phone system that has everything your organization needs to deliver great customer experiences. MiVoice Business is at the heart of Mitel’s leading on-site communication solution (comprising of MiVoice Business, MiCollab, MiTeam Meetings & MiContact Center Business), enabling your organizations employees to instantly benefit from unified, scalable and mobile communications. It’s everything your business needs to take its communications to the next level—through mobility, team collaboration, video conferencing and exceptional customer experience delivery. MiVoice Business is designed to meet the needs of businesses from 5 to 130,000 users, in a single site or a multi-site network that spans the globe. Software running on Mitel Collaboration Service Appliances can be installed on industry-standard x-86 servers in a virtualized environment, which eliminates the need to support multiple appliances, especially for customers who choose a centralized UC deployment. -
19
Eclipse CMS4
Datatrack
See a quick return on investment through cost savings, improved operational efficiencies and better customer service. Our Call Management System (CMS4) provides organizations with the ability to take control of their telephony costs with detailed analytics on performance. Whether you have a small system or a large clustered worldwide network, CMS4 will provide you with the information you need and in the format you require. CMS4 is provisioned either as an On-Prem, Cloud or a complete hosted managed service solution. Whether you have a small system or a large clustered worldwide network, CMS4 will provide you with the information you need in the format you require. You can use CMS4 to measure the traffic at each gateway or trunk group and produce grade of service reports that will clearly show you if your capacity matches your demand. This information can be used to ensure that your system is running efficiently to meet current demand and forecast future requirements. -
20
Taridium ipbx
Taridium
The Taridium ipbx is a highly capable software VoIP PBX system that replaces a traditional hardware based PBX. ipbx runs on standard server hardware, or in the cloud and does not require any additional software licenses. An End User Panel that let’s you control all aspects of your own extension, such as managing your call via an operator console, listen to voicemail, configure call forwarding, create ad-hoc telephone conferences and much more. Configure your extension to only forward during certain times, using your iCalendar feed or based on a list of favourite caller IDs. A meet-me type conference room for each and every user. No more scheduling conflicts and live conference management, which allows you to mute and kick participants. Invite users with the click of a button and have the system call them instead of having to provide cumbersome login instructions.Starting Price: $199 one-time payment -
21
Softdial Contact Center
Sytel Ltd
Softdial Contact Center™ (SCC) is Sytel’s flagship suite of feature-rich contact center applications and services, currently driving 50,000+ users in 50+ countries. Maximize agent productivity, with high-performance predictive dialing, and a tailored omnichannel desktop allowing work on several open text sessions at once. As a platform, SCC is uniquely flexible, allowing users to either run the full suite or choose which modules to deploy. It can be extended via SCC’s comprehensive, robust APIs, modified, adapted and even white-labeled to fit any business requirements. SCC manages communication on all media channels – voice, chat, email, messaging – automatically blending and load balancing contact sessions between all agents, all queues and campaigns with its Automatic Session Distributor (ASD®). -
22
FreeSWITCH
FreeSWITCH
Everything you need to know to dive into the FreeSWITCH platform. FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a versatile software implementation that runs on any commodity hardware. From a Raspberry PI to a multi-core server, FreeSWITCH can unlock the telecommunications potential of any device. Combined with our hosted cloud platform, SignalWire, FreeSWITCH can interconnect with the outside world and scale to any size. The Pre-built virtual machine has both a written and video how-to to help you get started. All you need is a copy of virtualbox and you can be off and running in minutes. If you are an experienced developer you can also follow the instructions below to compile the FreeSWITCH platform from source among other manual installation options. If you already have a spare Debian instance handy, you can follow the link below to get detailed instructions on how to get our packages installed. -
23
sipXcom
sipXcom
sipXcom was established in January of 2015 from a fork in the sipXecs project by the development team at eZuce, Inc. sipXecs and SIPfoundry in particular had become a user community and was not seeing any growth in the developer community. Due to a restrictive contributor agreement, sipXcom is without any restrictive contribution rights. sipXcom source code licensing is based on the copyleft-friendly AGLP v3 (Affero General Public License). SWARM is the code name for the next generation of sipXcom/sipXecs projects. Under development with anticipated production readiness scheduled for early 2017, SWARM will be a microservices-based architecture that will improve upon sipX scalability, reliability and configurability. The software is designed to support any compute platform whether you want to use dedicated, virtual, or cloud-based servers. You can also create hybrid implementations with a combination of premise-based and data center or cloud instances. -
24
Vocalcom
Vocalcom
AI-Powered Cloud Contact Center Solution that powers innovative, personality-based routing and manages multichannel customer interactions as a single conversation. Welcome to the Vocalcom world, where digital engagement and artificial intelligence (AI) are seamlessly integrated into the customer interaction flow alongside live agents. Manage all customer interactions as one single conversation. A new generation of cloud contact center platform that works with existing systems and supports ALL channels. Vocalcom's intuitive user experience increases productivity and allows companies weave all their customer interactions—across all channels—together into continuous conversation threads, to reduce customer effort and strengthen customer relationships with every interaction. Adaptable, AI-Powered and Amazingly Simple Keep the conversation flowing. Customer interactions across phone, chat, text message, email, social media, and any other channel, all come together in one place. -
25
United Office
United Office
Unified Office, Inc. is a leading provider of SDN-based Hybrid Cloud (trifecta of on-premise, private cloud, and public cloud) managed Voice-over-IP and Unified Communications services to Small and Medium-sized Businesses (SMBs). Our Total Connect Now℠ service architecture was purpose-built from the ground up to deliver the highest quality of experience and availability, leveraging the latest in extensible business VoIP communications technology and cloud-based infrastructure to enhance SMB workforce productivity. This unique architecture is the result of the team’s collective decades of experience in both the telecommunications service provider and large enterprise data networking industries. As a business VoIP provider, our team has designed protocols, built scalable products, integrated, deployed and supported carrier-grade equipment into many of the largest converged networks around the world. Quality, dependability, innovation, and support are core to our values. -
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R.E. Communications IP-PBX Premise based
R.E. Communications
R.E. Communications offers an Asterisk based IP-PBX system. These systems support all industry standard SIP phones, with enterprise level features that go from 1 phone to 4000 phones. These systems also support SIP trunking which with the combination of SIP trunks and SIP phones you can replicate the services of a Hosted solution but save on the per seat cost. Typically a 10 phone/seat system can be supported with 4 to 6 SIP trunks which is a savings over the 10 seat cost of a Hosted solution. -
27
Intalk.io
Intalk.io
Intalk.io is a Multi-Channel Call Center Software Solution in India equipped with enterprise-grade Communication abilities. Intalk.io unifies all business communication channels – voice, email, SMS, webchat and social media within a dynamic & robust, centrally managed Customer Experience Management Platform. With the Cloud Contact Center Software, you can have a seamless experience as our state-of-the-art solutions make it easier for you to manage the workflow. If you have CX on your mind, then this solution is for you! Intalk.io ensures that your customers have a seamless experience while interacting with you. A call center management software that focuses on helping you overcome every hurdle and establishing stronger customer relationships. There is no better way to market your product/service than a happy customer who will advocate about your brand through word of mouth. If you focus on an enriched customer experience, your business is bound to grow. -
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Momentum Telecom
Momentum
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. More at gomomentum.com -
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astTECS
*astTECS
*astTECS provides complete enterprise telecom products based on Open Source Technology- such as IP PBX and Contact Center Solution. *astTECS IP PBX offers all the high-end features at an affordable price enabling your business to be future-ready, flexible, innovative and competitive while reducing your telecom expenses. *astTECS IP PBX can seamlessly integrate with any applications - CRM, ERP, PMS and even with your existing telecom infrastructure. *astTECS call center solution has advanced features with a real-time agent monitoring dashboard helps to improve your agent productivity and customer engagement with advanced analytics. *astTECS also offers a complete call recording solution for your business with real time dashboards.
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