9 top unified communications providers for 2026

1. 8x8 XCaaS

Dubbed "experience communications as a service," this fully cloud-deployed system delivers UC, contact center and API services under a single platform. Experience Communications Platform is ideal for businesses with large remote workforces, many of whom operate in call center and contact center roles. 8x8 Engage extends the functionality of the UC platform with AI and omnichannel support, designed to improve customer experience beyond traditional contact center capabilities.

UC-specific features for business phone users include unlimited calling; text messaging; fax; voicemail; call recording; call forwarding, transfer and parking; directory assistance; and call analytics. Collaboration capabilities include video meetings for up to 500 participants, integrations with productivity apps and one-on-one and team chats.

A single platform for UC and contact center offers IT teams more in-depth reporting and analytics, as well as simplified security, compliance and privacy controls.

2. Alcatel-Lucent Enterprise OmniPCX

OmniPCX Enterprise Communication Server is geared toward large enterprises. Alcatel-Lucent Enterprise (ALE) is one of a handful of vendors that offers a true end-to-end UC product to simplify the ongoing management and support of its UC platform.

OmniPCX is highly scalable. Users can architect its centralized management interface to support multiple geographic locations. Its modular design lets companies select the components they need to power their UC requirements, including Session Initiation Protocol (SIP) endpoints, video conferencing and softphone applications, as well as media gateways to connect the UC platform to external entities and third-party services, according to ALE.

UC services can be deployed as VMs or by using dedicated hardware appliances. Each UC server can support up to 15,000 extensions. If required, ALE can cluster multiple servers to support more than 1 million extensions. OmniPCX also offers mobility features, such as the ability to have unique public switched telephone network (PSTN) numbers among business phones, mobile headsets and softphones. Hybrid cloud connectivity is available using ALE's Rainbow communications platform, and contact center connectivity is available through ALE Connect.

3. Avaya Aura

Avaya offers end-to-end UC functionality through its on-premises Aura platform, now part of the company's Communications & Collaboration Suite, which incorporates contact center as a service and other collaboration tools. The company has integrated the telephony platform with cloud technologies, such as Avaya Cloud Office by RingCentral, for businesses migrating to hybrid cloud environments.

The Aura platform includes multiple communication components so businesses of all sizes can use it. Aura is scalable and modular, integrating voice calls, video, live chat, file sharing, mobility and other services. The platform is underpinned by Aura Communication Manager, which delivers more than 700 real-time voice, video, messaging, mobility and other UC services.

Aura Communication Manager is responsible for registering and maintaining all SIP endpoints, call routing, call queuing, prioritizing voice and video calls, and more. Avaya Aura also offers built-in conferencing and contact center platforms -- a good option for businesses with call centers and challenging conferencing requirements.

Other Aura components include a session manager to help manage VoIP routing, SIP trunking and user and group profiles; a session border controller (SBC) for terminating external SIP trunks; a presence server to help identify locations and statuses of employees; and an application enablement services server that offers advanced APIs and web services for third-party integrations. The company has partnered with Zoom to offer Aura and Zoom Workplace collaboration tools, including AI Companion.

Avaya Aura also supports cloud enablement through the Avaya API Exchange to connect to third-party cloud services, including Microsoft Teams, Salesforce and ServiceNow.

4. Cisco Unified Communications Manager

Cisco Unified Communications Manager (CUCM) is an end-to-end UC platform. It's tightly integrated with Cisco's communications and collaboration suite, Webex, and can be deployed in a hybrid or fully public cloud architecture. Webex Suite supports calling, video conferencing, messaging and file sharing and provides AI functionality.

CUCM can be tailored to support businesses ranging from a few hundred to 100,000 users. Businesses can opt for third-party SIP phones, but most deploy one of Cisco's IP phones, some of which include built-in video conferencing capabilities.

Cisco Unified CallManager is the platform's foundation. It provides basic functionality, such as IP phone registration, call control, call routing and session management. Other features require add-on platform servers, including voice messaging, IM and enterprise video conferencing. CUCM can access cloud-based calling capabilities, such as AI receptionist and cloud PSTN, through Webex Calling Hybrid.

CUCM accommodates mobile workforces with enhanced extension mobility. CUCM can also integrate with Cisco's hosted collaboration platform or Webex Calling for branch offices and remote workforces. Webex Suite supports Google Workspace, Microsoft 365 and Salesforce.

5. Microsoft Teams

Microsoft Teams offers a full range of UC services, including team chat, file sharing, video conferencing and VoIP calling with PSTN access. Teams licensing is available with the Essentials, Microsoft 365 Business Basic, Microsoft 365 Business Standard, Teams Enterprise and Microsoft 365 E3 and E5 plans.

Teams natively works with many of the other Microsoft 365 applications, such as Outlook, OneDrive, Excel, PowerPoint, SharePoint and OneNote. Microsoft's Copilot AI functionality is designed to help automate tasks and improve collaboration through capabilities such as meeting recaps, chat integration and document creation.

Organizations can access calling features through Teams Phone. Organizations can access Teams Phone through the Microsoft Calling plan, which provides a cloud-based phone system with PSTN access. Organizations that want to maintain PSTN access through their chosen carrier can opt for Direct Routing or Operator Connect.

While Teams Phone is available in Dynamics 365 Contact Center, the platform is not offered with Teams. Organizations can integrate their contact center platform with Teams through the connect, extend and power integration models.

6. Mitel MiVoice and MiCollab

Mitel Networks has become a formidable player in the enterprise UC space for large and small businesses. The MiVoice portfolio comes in several on-premises and cloud deployments geared to an organization's size, geographic location and number of users. Mitel also partnered with Zoom to provide hybrid communications.

MiVoice Business is a UC platform that combines telephony, messaging, video conferencing, mobility and contact center. The platform supports businesses of all sizes, up to 65,000 users. It also offers purpose-built integrations for vertical industries, including healthcare, hospitality, financial services and education.

The MiVoice MX-ONE platform spans multiple sites and geographic locations, handling anywhere from 500 to more than 100,000 users. The SIP-based platform offers telephony, messaging, video conferencing and omnichannel contact center.

Businesses can choose how they want to deploy the platform. Larger MiVoice platforms can be installed through proprietary appliance hardware directly from Mitel. Alternatively, the UC OS and services can be installed on standard x86 bare-metal servers or as a VM -- on-premises or in a private or public IaaS cloud. For multiple server environments, businesses can combine appliances, bare metal and virtual servers.

MiCollab provides a single platform for collaboration services, including voice, video, chat and text messaging. MiCollab also offers a native integration with Microsoft Teams to extend collaboration and telephony features using Mitel's infrastructure.

7. Mitel OpenScape Enterprise

Mitel bolstered its UC and contact center capabilities by acquiring Unify (OpenScape Voice) from Atos SE. OpenScape Enterprise comprises a wide range of enterprise communications options for on-premises, cloud and hybrid environments. The main components include OpenScape Voice, Media Server, UC, mobility and video meetings, Xpressions for messaging, contact center, and SBC for SIP trunking.

OpenScape is 100% SIP-compatible; businesses can use most enterprise-grade, SIP-compatible phones. The OpenScape Voice platform features sizable redundancy and scalability capabilities. It scales up to 100,000 users per system. Mitel claims the product can an unlimited number of users in a multisite deployment. OpenScape Voice is delivered to customers as a Linux-based VM that must be installed in a hypervisor environment. Mitel doesn't offer appliances, nor does it support bare-metal installs. OpenScape Voice also integrates with Microsoft Teams through SIP trunking.

With OpenScape UC, employees can connect with each other or customers via a desktop client, web client, voice portal or mobile client. Advanced UC applications, such as Mitel's mobile client, can operate within OpenScape UC to provide mobility features. With the mobile device client, users can perform video calls, access presence services and conference calls, set their preferred device and more.

Like many other enterprise-grade UC platforms, Mitel's OpenScape Voice offers contact center features for businesses that require call center capabilities. OpenScape Contact Center is designed for midsize to large contact centers supporting up to 7,500 active agents in a multiserver deployment model or up to 1,500 active agents on a single server.

8. RingCentral RingEX

RingCentral's UC platform offers messaging, video conferencing and phone capabilities. RingCentral's AI functionality adds intelligence capabilities across its cloud-based communications products. The SaaS-based RingEX business phone system, formerly RingCentral MVP, is offered in three service tiers, billed either monthly or annually:

1. Core. Each user gets access to unlimited U.S. and Canada calling, a business or toll-free phone number, text messaging, 100 toll-free inbound minutes, visual voicemail, shared line capabilities and meetings for up to 200 participants. The plan also includes a personal AI assistant for capabilities including meeting and call transcriptions, video highlights and meeting summaries.
2. Advanced. In addition to the features found in the Core tier, toll-free minutes are raised to 1,000. Business features such as extension calling, receptionist and administrator console, automatic call recording, advanced call routing and hot desking capabilities are available. Additional AI assistant features include summarizing, writing assistance and translation for both team chats and text messages.
3. Ultra. Users get access to everything in the Advanced offering, in addition to device analytics and alerts, business analytics, unlimited file storage and up to 10,000 inbound toll-free minutes each month. The plan also includes the same AI features as the Advanced plan.

Add-on features are also available to all tiers, including AI Receptionist, RingCentral Webinar, conference room equipment licenses, international phone numbers and push to talk. Business Phone can also be integrated into other RingCentral services, such as RingCentral Contact Center or RingCX. The company has also partnered with Avaya to integrate its cloud services, and integrates its telephony capabilities with Microsoft Teams.

9. Zoom Workplace

The Zoom UC platform includes video conferencing, telephony, email, calendar, chat, and collaboration tools. SaaS-based Zoom Phone, which integrates PSTN calling capabilities, is available as an add-on to the Basic, Pro and Business tiers. It is included with the Enterprise plan. Zoom Phone is offered in four tiers:

1. U.S and Canada Metered. A pay-as-you-go model that includes metered domestic U.S., Canada and international calling, text messaging, access to U.S. and Canada phone numbers, and multi-device use, including supported desk phones and smartphone and tablet apps.
2. U.S and Canada Unlimited. This plan includes everything in the metered tier, with the addition of unlimited U.S. and Canada calling and metered international calling. An optional add-on is available for unlimited calling to 19 different countries.
3. Pro Plus. This plan includes everything in the US and Canada Unlimited plan and is bundled with Zoom Workplace Pro. It includes support for unlimited meetings up to 100 participants, AI Companion, team chat, email and calendar.
4. Business Plus. This plan includes everything in Pro Plus and additional capabilities, including unlimited meetings up to 300 participants, unlimited whiteboards, scheduler, SSO and device management.

Zoom Workplace also includes third-party integration with popular business applications, such as Salesforce, Slack and Microsoft 365. Toll-free numbers are also available. A custom version of AI Companion is available at an additional cost. Zoom Contact Center is an option for businesses that serve inbound and outbound call centers.

Editor's note: This article was updated in February 2026 to reflect the latest developments in UC provider platforms.

Andrew Froehlich is founder of InfraMomentum, an enterprise IT research and analyst firm, and president of West Gate Networks, an IT consulting company. He has been involved in enterprise IT for more than 20 years.

Kathleen Richards is a freelance journalist and industry veteran. She's a former features editor for TechTarget's Information Security magazine.