Best SIP Trunk Providers for Microsoft 365
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Compare the Top SIP Trunk Providers that integrate with Microsoft 365 as of July 2026
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This a list of SIP Trunk providers that integrate with Microsoft 365. Use the filters on the left to add additional filters for products that have integrations with Microsoft 365. View the products that work with Microsoft 365 in the table below.
What are SIP Trunk Providers for Microsoft 365?
SIP trunk providers are communication service providers that utilize the Session Initiation Protocol (SIP) to provide voice and multimedia sessions over the Internet. They can be used to interconnect an organization’s VoIP infrastructure with the public switched telephone network, allowing businesses to make use of their existing VoIP systems while also taking advantage of external telephony services. SIP trunking is seen as a cost-effective way of providing reliable voice and data services for businesses. Compare and read user reviews of the best SIP Trunk providers for Microsoft 365 currently available using the table below. This list is updated regularly.
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Intermedia Unite
Intermedia
Intermedia Unite® brings business communications, collaboration, and customer engagement into one easy-to-use platform—keeping teams connected, productive, and responsive from anywhere. It replaces fragmented tools by combining business phone service, video conferencing, team chat, and file sharing into one seamless experience, so employees can collaborate without switching apps. Unite delivers enterprise-grade calling with 100+ features, integrated customer engagement, and enhanced Microsoft Teams experiences. With mobile and desktop apps, users can call, meet, message, and engage customers from anywhere while maintaining a consistent business identity. AI-powered transcription, summaries, and insights help teams capture details and follow up efficiently. Backed by 99.999% uptime and J.D. Power-certified support, Unite ensures reliable performance—resulting in simpler communications, more productive teams, and better customer engagement. -
2
Sherweb
Sherweb
A secure and reliable solution for your online business. Everything you need to get started. A user-friendly control panel to manage your website. Experienced support technicians. Access to a huge library of pre-configured web apps for your website. With Sherweb as your trusted cloud partner, you’ll be surprised by what you can achieve. Our full-fledged cloud management platform, driven by evolving business needs, empowers IT professionals to leverage agile solutions paired with 5-star service by trusted experts they can count on. We’re born in the cloud – IT folks rest easy knowing our ever-expanding portfolio of innovative products has been hand-picked and pre-vetted, including a selection of proprietary software you won’t find anywhere else. We bring you a mature, powerful platform that doesn’t make you choose between saving time and saving costs. Automate and integrate just about anything, leveraging our cutting-edge APIs.Starting Price: $7.25 per month -
3
Spoke Phone
Spoke Network
Spoke is the leading platform for high-value, complex, and regulated conversations. Spoke guides employees to say and collect the right things so deals move forward and customers get better experiences. Spoke integrates with everything, personalizing conversations, driving productivity, and ensuring compliance. Trusted for over 250,000 conversations every day with features such as calls, SMS, WhatsApp, Team Inbox, programmable routing, Personalized IVRs, caller insights, forms, analytics, +more. The Problem Today, only a small portion of your employees are equipped or have the skills to have highly-contextual, complex, and personalized customer conversations. The Solution Spoke empowers every employee with the information and skills to hold high-quality compliant conversations that drive positive customer and business outcomes.Starting Price: $15 per month -
4
Fusion Connect
Fusion Connect
Connect your entire business with one call. Fusion Connect is your Managed Services Provider tailoring business internet solutions for your SD-WAN, business VoIP, unified communications (UCaaS), internet access, secure networking, and more. Fusion Connect's Business VoIP also features Internet-based faxing, SIP trunking, softphone, and auto attendant functions. Compatible with Windows and Mac, as well as device independent.Starting Price: $19.95/month/user -
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As an official Microsoft direct routing partner, Intrado’s Operator Connect is a certified Microsoft Teams phone system. Get calling, chat and meetings from the same place. Operator Connect is an affordable alternative to Microsoft calling plans when you need commercial flexibility or service in areas not covered by Microsoft today. Bring your own SIP solution if needed for expanded international coverage. Eliminate local gateways, avoid costly PRI circuits and deliver maximum uptime via Intrado’s cloud-first delivery. Intrado can provide and support all services or integrate into your existing carrier partners or PBX. No new hardware required. We also offer licensing of Microsoft Teams and Microsoft 365. Discover what else you can get from two of the world’s most popular business solutions. Communication solutions work better together. Consider an all-in-one communication suite to simplify your business with a single provider for calling, collaboration and contact center.
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Intermedia SIP Trunking
Intermedia Cloud Communications
Modernizing your on-premise business phone system with SIP Trunks allows you to increase flexibility while saving on your telephony costs. Modernize an existing phone system or save enough to justify a new phone system. Most newer phone systems are compatible with SIP Trunking with no extra equipment. Our Partners work in tandem to help with all setup and migration tasks. Save money with reduced long-distance, toll-free, and international calling rates. Leverage Intermedia's enterprise-grade datacenters to protect against local outages. With the phone company, customers typically pay on a per-line basis for physical phone lines that originate in their central office. These phone lines are costly. Customers invest a lot when they initially deploy them, and it's very expensive to add more to accommodate growth. But with SIP Trunking, phone calls are routed over the internet. And this makes all the difference. -
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Sewan
Sewan
More than ever, professionals need to be able to communicate with each other and with their customers. Whether in the office or on the move, our telephony solutions can be adapted to suit everyone’s needs. Fixed telephony, mobile telephony, trunking, contact center or even telephony in teams, business telephony is becoming ever more versatile. Sewan's solutions can be easily adapted to every need. The voice technologies used in our solutions guarantee optimum call quality and rock-solid reliability. We know that business needs can change rapidly. Adding or deleting lines, and importing contacts, it's all done in the blink of an eye. Whatever type of business telephony you choose, our solutions are designed to be as cost-effective as possible, there's nothing superfluous. Our solutions are designed with the international market in mind: all our packages can be adapted to different needs.
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