Best Business Phone Systems

Best Business Phone Systems

Best Business Phone System for Small Businesses: 8x8

8x8 offers everything a small business needs in a phone system. The service is a cloud-based Voice-over-Internet Protocol (VoIP) system that doesn't require expensive PBX hardware or a trained IT staff to set up or maintain. All that's needed is high-speed internet access and IP phones. The service is among the most reliable we found and comes with a complete host of features and tools. Additionally, the customer support was among the best we encountered.

Best Business Phone System for Small Offices: Ooma Office

Ooma Office is designed specifically for very small businesses. The system, which works for businesses with up to 20 employees, can be set up in minutes and requires no special wiring or phones. It includes a variety of features that allow small offices to present themselves in a professional manner, such as an auto-receptionist, ring groups and voicemail-to-email. 

Best Virtual Phone System: RingCentral

RingCentral Professional is specifically designed for businesses with on-the-go employees. The service connects business phone lines to remote workers on their mobile and home phones. While other providers also offer this service, few do so with such a wide range of features – including a mobile app and the use of a softphone on the employee's computer – for such a low cost. There is also one plan that includes a RingCentral Office VoIP line. 

Best Business Phone System for Call Centers: ShoreTel

ShoreTel's phone system has all of the tools and features a business needs to run a professional call center. The system is available as an on-premises or cloud-based solution. The call center services, which are tacked on to ShoreTel's regular business phone system, include a variety of call queue options, integrations with numerous CRM solutions and call recording. It also offers several valuable supervisor tools, including the ability to listen in on agent calls.

Our Methodology

To determine the best business phone systems, we started by listing all of the vendors that have good reputations online (i.e., services that other websites favorably and consistently reviewed). Then, we interviewed small business owners to discover new systems to add to our list.

We ultimately settled on the following 19 phone systems to consider as best picks: 8x8, AT&T, Avaya, Booth, Cisco, Dialpad, ESI, Fonality, FreedomVoice, Grasshopper, Jive, Mitel, Nextiva, Ooma Office, Phone.com, RingCentral, ShoreTel, Toshiba and Vonage. (See full list of business phone systems and their websites below.)

Next, we researched each provider by investigating its services, watching tutorials and how-to videos, and reading user comments. We also contacted each company's customer service department and posed as business owners to gauge the type of support each provider offers its users. Finally, we considered the pricing that was available on these services' websites or what was quoted to us during customer service calls.

Our process involves putting ourselves in the mindset of a small business owner and gathering the data that would be readily available to such an individual. We perform all of our research by visiting company websites, making calls to customer service departments and interviewing real users.

We analyzed each system based on the following factors:

• Deployment options
• Level of service
• Reliability
• Customer service
• Calling features
• Collaboration tools
• Mobility options
• Cost
• Better Business Bureau accreditation, ratings and complaints

Here is a full list of business phone system providers and a summary of what each company claims to offer. This alphabetical list also includes our picks for best services. [See Related Story: VoIP for Business: Why It Makes Sense]

1-VoIP – This VoIP service provider offers different plans based on the number of users a business has. The smallest plan accommodates up to five employees, while the largest one supports up to 100 users. Plans include digital call forwarding, cell phone redirecting, extension monitoring, call parking, intercom service, call waiting, auto-attendants, digital queues, custom on-hold music, voicemail, call recording and other features. 1-VoIP also offers SIP trunking services. 1-voip.com

3CX – 3CX is the developer of a software-based and open-standard IP PBX, which replaces proprietary PBXs. With integrated WebRTC web conferencing, softphones for Mac and Windows, and smartphone clients for Android, iOS and Windows phones, 3CX offers companies a complete unified communications package. 3cx.com

*8x8 – 8x8 is a hosted VoIP-based phone system that includes personalized voicemail, three-way calling, caller ID, call waiting, transfers, call forwarding and chat. The system offers an online dashboard to manage communications, with call history, voicemail notification and calling from a PC. 8x8 also provides auto-attendants, corporate directories, on-hold music, conference bridges and ring groups. In addition, the service's mobile app allows staff members to manage their business communications from anywhere. Besides its traditional business phone systems, 8x8 also provides contact center services.

AirePBX – AirePBX is a cloud-based phone system that provides true Unified Communications as a Service (UCaaS). With AirePBX, you can work from your desk phone, smartphone, tablet, desktop computer or laptop. AireSpring preconfigures equipment and dispatches a technician to perform professional on-site installation and testing of IP phones, routers and switches to ensure that the communications system works perfectly. Call center services are also available. airespring.com/product/cloud-phone-system

All Call Technologies – All Call Technologies is a virtual phone system. There is no equipment installed in your office and no changing of your current phone carrier. All Call Technologies' virtual receptionist answers your calls with a professional greeting and gives callers their options. Outgoing greetings are professionally recorded and programmed to your specifications. The backup attendant service takes calls only when your office lines are busy or not answered, while the auto-attendant service plays a menu greeting immediately when someone calls. In addition, an Entrepreneur and Partner plan provides one central phone number with extensions to reach you, your partners and staff via cell phones. allcalltechnologies.com

Allworx – Allworx provides a complete portfolio of VoIP systems, IP phones, network switches and advanced software options. It is available to small and midsize businesses through a network of more than 1,000 independent resellers in the U.S., Canada and Latin America. The company also offers Windstream IP Simple, a managed monthly subscription service that combines Allworx with VoIP and data services from Windstream. allworx.com

AT&T – AT&T Business in a Box is a VoIP solution for small businesses and satellite locations that provides the benefits of advanced voice and data technology without the complexity of having to manage it. This solution enables voice and data services to work over a single network connection and device. The company also offers AT&T Unified Communications Voice, a cloud-based IP telephony solution that offers a range of voice features, as well as call center solutions. business.att.com

Avaya – Avaya's contact center and unified communications technologies and services are available in a variety of flexible on-premise and cloud-hosted options. Avaya's Communicator lets employees access instant-messaging tools, voicemail, conferencing and video. The Avaya systems, which support up to 250,000 users, also offer mobile options that allow employees to access voice and video communications from mobile devices. avaya.com

Axvoice – Axvoice is a cloud-based system for independent entrepreneurs, and single-office and home-office professionals. The service has more than 30 inbound and outbound calling features, including caller ID, caller ID blocking, music on hold, simultaneous ringing, do-not-disturb options, call filtering and anonymous call rejection. In addition, the system allows employees to manage their voicemails via the web. axvoice.com

Birch – Birch's TotalCloud PBX is a cloud-hosted phone system that supports your entire workforce. With this system, you can transfer callers, put them on hold with music, set up conference calls, or have the phone answered by an automated attendant that can direct callers to different departments. TotalCloud PBX allows you to route callers around the way you do business. birch.com

Blueface – Blueface provides cloud-based phone systems to businesses of all sizes worldwide. While many hosted providers rely on third party platform technology, Blueface's technology is 100 percent proprietary, which allows them to guarantee reliability and service availability. Blueface users have the ability to keep their own phone numbers when signing up for the service, as well as hold up to several international phone numbers that all direct to one account. Features include unified voicemail, call recording, fax-to-email, call parking and time of day routing. blueface.com

Booth – Booth is a virtual phone system that allows you to run your business through your cell phone. Booth works by creating call rules that allow you to route calls based on time of day or who's calling, or through an integrations platform. Through the integrations platform, you can connect with software that you already use, such as Google Calendar, and have calls sent to voicemail or a colleague when you are in a meeting, or to your cell phone when you're available. Booth's other features include auto-attendants and business hour rules. trybooth.com

BroadConnect – BroadConnect is a business VoIP service provider that has many advanced features, such as video and audio conferencing, mobility, custom IVRs, voice broadcasting, and call analytics. The company offers a variety of types of phone systems for businesses of all sizes, including hosted PBX, SIP trunking and call center solutions. broadconnectusa.com

Broadview Networks – Broadview Networks' OfficeSuite platform is a hosted phone system that unifies all communications in the cloud and requires no out-of-pocket expense for new equipment. It has common and advanced features, including unlimited calling; online fax service; HD video, audio and web conferencing; toll-free phone numbers and service; and internet access and multisite data-networking options. It also offers call center services and call-recording software. broadviewnet.com

Cebod Telecom – Cebod Telecom provides cloud-based telephony solutions for businesses of all sizes. The company offers a pay-per-line phone service model that allows businesses to pay per line, as opposed to per user. Cebod Telecom provides a wide variety of basic and premium IP PBX and dial-tone features, including auto-attendants, call tracking, call logs, music on hold, call forwarding, voicemail, call queues, conference bridges, online faxing and SMS. cebodtelecom.com

Cisco – Cisco offers a variety of phone systems, including the Business Edition 6000. This purpose-built, all-in-one solution is designed for companies with 25 to 1,000 users. The service also provides a variety of computer-integrated programs to help businesses collaborate with customers and employees. In addition to the Business Edition 6000, Cisco offers many other unified communication and contact center solutions. cisco.com

Cloud Phone – Cloud Phone is a virtual phone system that will answer, route and manage your calls. There are no phones or equipment to buy, because the system is fully managed in the cloud. Extensions can be set up to route calls to the mobile app or other numbers. Features include an auto-attendant, call recording, call screening, conference calling, online faxing and voicemail transcription. cloudphone.com

Cloud Phone Answering – Cloud Phone Answering is a live telephone answering service that provides your business with a friendly, professional receptionist who will answer your phone and handle your calls just as you wish. With the receptionist service, you choose a local phone number. Clients and customers can call that number directly, or you can divert calls made to any other number, such as your mobile phone, to your new number. The receptionist then answers any calls that you can't get to and sends you your messages via email or text. phoneanswering.net

Comcast – Comcast's business phone plans include a versatile service that can fit the needs of most businesses. The company offers basic lines, full-featured lines and voice mobility, which lets you take business calls wherever you work. Full-featured lines have more than 20 features, including unlimited local and long-distance calling and web-based management. The voice mobility line allows you to automatically answer calls on all mobile devices and landlines and transfer calls between your mobile and office phones. business.comcast.com

Crexendo – Crexendo is a full-service cloud solutions provider that delivers critical voice and data technology infrastructure services to the startup, SMB and small enterprise markets. The system features call forwarding, call continuity, voicemail, visual voicemail, conference calling and personal direct-dial phone numbers. crexendo.com

Dialpad – Dialpad is a cloud-based, business-grade phone system. Available on any device, anywhere, Dialpad includes voice, video, group messaging, SMS, MMS, conferencing, screen sharing and document sharing, and is integrated with Microsoft Office 365 and G Suite. Features include a virtual receptionist, call forwarding, call recording and visual voicemail. dialpad.com

Digium – Digium's Switchvox offers both cloud-based and on-premise IP phone systems. Switchvox Cloud offers business owners the same feature set as the company's on-premise phone system, but takes away the worry of handling daily maintenance or making large upfront capital investments. Switchvox's premises-based IP PBX provides an end-to-end unified communications solution with enterprise-class features. digium.com

ESI – ESI offers a wide range of cloud-based and on-premise phone systems for businesses of all sizes. Key features of its systems include web-based administration, a mobile app, easy phone programming, presence management, visual voicemail, secure chat, a click-to-call feature and automated help. esi-estech.com

eVoice – eVoice is a full-service business phone system that's managed entirely in the cloud. You select a toll-free or local business number and record a custom greeting with a menu of extensions. Then you decide where calls get routed to and when. Your callers will see only your business number, no matter where you have the calls routed. Features include auto-attendants, call logs, call queuing, call notification, call waiting, voicemail-to-email and voicemail transcription. evoice.com

Evolve IP – Evolve IP's phone systems free businesses from managing carriers, hardware and vendors by providing a hosted PBX with unified communication features to any user in any location. The phone system features group directories, three-way calling, call forwarding, overhead paging, unified messaging, hoteling and simultaneous rings. Evolve IP also offers hosted call center services. evolveip.net

FacetCorp – FacetCorp's FacetPhone is a full-featured VoIP business phone system with unified communications and full mobile access. FacetPhone has all the features needed in a business phone system, such as voicemail, auto-attendants and conference bridges. FacetPhone is an on-premise system that runs on either a Mac Mini or a Linux server. facetcorp.com

FairPoint Communications – FairPoint Communications' hosted PBX solution is a feature-rich phone system with mobile- and cloud-based services for businesses of any size. With FairPoint, all customer calls are routed over a secure Ethernet network for clear voice quality and reliable service. FairPoint service is only available in 17 states. business.fairpoint.com

FluentStream – FluentStream is a cloud-based VoIP phone systems for businesses of all sizes. The phone system features an auto-attendant, conference calling, call recording, voicemail, extension dialing, music on hold, and online faxing. FluentStream also offers call center services. fluentstream.com

FortiVoice – FortiVoice has options for businesses that are looking for traditional analog systems or VoIP systems. Both options offer a variety of features, including auto-attendants, dial-by-name directories, music on hold, voicemail, voicemail to email, call logging and remote management. FortiVoice systems also allow for conference calls, call bridges, call waiting, call forwarding, call screening and caller ID routing. fortivoice.com

FreedomVoice – FreedomVoice provides cloud-based communications systems for small and midsize businesses. The company offers three different systems: CloudNumber, CloudPhone and CloudPBX. CloudNumber is a virtual service that routes calls to you immediately or provides you with the ability to use a custom professional greeting to answer and route your calls for you. CloudPhone includes unlimited domestic local and long-distance calling. CloudPBX is a scalable, cloud-based business phone system that doesn't require any big-ticket hardware. Each phone is professionally installed, configured and supported by a certified local partner. freedomvoice.com

Frontier – Frontier offers VoIP-based phone systems with unlimited local and long-distance calling. Frontier's OneVoice system, designed for small businesses, features voicemail, caller ID, call waiting, call forwarding, call hunting, and selective call acceptance and rejection. business.frontier.com

Globalgig – Globalgig is a provider of VoIP phone, SIP trunking, hosted call center and hosted Skype for Business services. The company's VoIP system features an auto-attendant, hunt groups, voicemail to email and call recording. The call center services include an automatic call distributor, an IVR and music on hold. global.globalgig.com

Grasshopper – Grasshopper is a virtual phone system that lets you run your business via mobile phones. It works with your existing mobile and home phones, so you never have to purchase, install or maintain expensive phone hardware. The system works by allowing you to create and customize extensions that forward calls to your home or mobile phones. For both a local and national presence, you can have toll-free and local numbers for your business. Other features include an auto-receptionist, music on hold, conference calling, call forwarding, call screening, voicemail and fax to email. grasshopper.com

Handility – Handility is a full-featured cloud-based phone system. There is no equipment to purchase, maintain or upgrade. Handility offers both unlimited-usage plans and pay-as-you-go plans. Phone systems can be configured via a web interface, with drag-and-drop objects that are logically connected to define the operation of your phone system. Features include the ability to forward calls to any phone number or VoIP destination, play back custom recorded messages to callers, send calls to a voicemail box, host conference calls, and implement time and caller-routing scenarios. handility.com

ICS – ICS offers VoIP and hybrid business phone systems for companies of all sizes. ICS has multiple products that can be designed as a pure IP solution, a pure digital solution or as a hybrid mix. ics-com.net

Intermedia – Intermedia is a provider of 30 different cloud-based services, including business phone systems. The company's cloud PBX system offers a host of calling features, including call blocking, call recording, on-hold music and messaging, follow me, instant callback, ring groups, voicemail, voicemail-to-email and web faxing. Intermedia's cloud PBX system has a 99.999 percent uptime and 24/7 customer support. intermedia.net/products/hosted-pbx

Jive – Jive's small business phone systems are VoIP-based and offer high-end features. The phone system includes more than 100 features, such as auto-attendants, call monitoring, conferencing, corporate directories, custom greetings, on-hold music, dial-by-name and dial-by-extension options, call forwarding, call waiting, and caller ID. The service also offers unlimited extensions, conference bridges, speed dialing, message-waiting indicators, individual call logs, voicemail-to-email and virtual faxing. jive.com

JustCall – JustCall is a cloud-based phone system for sales and support teams in 58 countries. After choosing a number, you can make calls using that number from the web, mobile app or desktop app. All the incoming calls on your number will come directly to your mobile phone or the JustCall web or desktop apps. JustCall logs and records all calling activities automatically. The system also integrates with popular CRM tools. justcall.io

Loop Communications – Loop Communications provides hosted business phone systems to small and midsize businesses in North Carolina and South Carolina. The system features unlimited local and long-distance calling within the United States, an automated attendant, call forwarding, call recording, cell phone extensions, three-way calling, music on hold, and voicemail to email. Loop Communications requires no long-term contracts. loopcommunications.com

MegaPath – MegaPath offers nationwide voice solutions for single-site and multisite businesses, including hosted VoIP with unified communications, SIP trunking, PRI trunking and analog lines. MegaPath's voice and unified communications services include advanced features like find me/follow me and visual voicemail, as well as SMS texting, instant messaging and presence, video calling and screen sharing. The company also offers call center services. megapath.com

MightyCall – MightyCall is a cloud-based, virtual phone system designed to simplify and improve customer access to support. With its mobile app, MightyCall consolidates client contact channels and captures every customer call, email and social media interaction, ensuring that every issue is handled in a timely fashion. Key features include SMS contact, a direct website-dialing widget, smart call forwarding, customized voicemails and call recording. mightycall.com

Mitel – Mitel business phone systems cover a range of digital and IP phones, consoles, conference phones and peripherals that are suited for businesses of all sizes and industries. The company's MiVoice unified communications platform offers a complete range of flexible communications platforms. Mitel also offers several call center solutions. mitel.com

Moneypenny – Moneypenny is a personal answering service. When someone calls your business number, if you're unavailable or simply don't want to answer the call yourself, the call is passed on to a Moneypenny receptionist. The receptionist can then transfer the call either to you or a colleague. If no one is available to take the call, the receptionist sends you a text or email, alerting you that you have a message waiting. Features of the service include toll-free numbers, local numbers, a bypass list and an online portal. moneypenny.com/us

NetFortris – NetFortris offers both cloud-based and on-premises business phone systems. NetFortris, which recently merged with Fonality, offers phone systems that feature three-way calling, call holding and transfers, caller ID and detailed call logs. There is also advanced call screening and routing, built-in presence and chat, and an auto-attendant. NetFortris also offers call center services. netfortris.com

NewVoiceMedia – NewVoiceMedia offers a computer-telephone integration (CTI) platform, ContactWorld, that works within the Salesforce CRM (customer relationship management) software to provide integrated phone tools such as IVR, virtual queue, voicemail drop, screen pop, click-to-dial service, autodialing, call recording and call routing. As this is a cloud-based CTI contact center solution, everything is delivered through a secure internet connection, with no hardware or software to install and run. ContactWorld can route calls based on data in any field of your CRM, and because of its deep integration, it can run advanced analytics that bridge call information with all other CRM data. Inbound and outbound calls can be recorded and tracked, and analyzed and evaluated on everything from call duration to caller status. The system can be tailored to fit companies of all sizes. newvoicemedia.com

Nexogy – Nexogy is a cloud-based phone system that includes a host of features, including auto-attendants, unlimited hunt groups, voicemail-to-text, call parking, call forwarding and call recording. Nexogy also offers contact center and SIP trunking services. nexogy.com

Nextiva – The Nextiva cloud-based VoIP phone system is an all-inclusive unified communication solution designed for businesses of all sizes. Nextiva's phone systems offer unlimited calling, conference calling, free local and toll-free numbers, voicemail, on-hold messaging, silent monitoring capabilities, and other features. The system also provides a mobile app that gives a business's employees the option of using the system's voice, video and instant-messaging capabilities straight from their mobile devices. In addition to its traditional business phone systems, Nextiva offers virtual phone systems and call center solutions. The call center plan includes call-queue visibility, free auto-attendant recording and one-click transfers. nextiva.com

OnSIP – With OnSIP, a hosted business phone system, there's no equipment to manage, and it's easy to set up. OnSIP offers more than 50 phone system features, hundreds of configuration options and the freedom to use any standard SIP phones. The company offers three pricing plans. Under the Pay as You Go plan, businesses only pay for the features they need and the calls they make, while the Unlimited User plan allows users to make and receive as many calls as they want. The Metered User plan gives each employee their own voicemail box, auto-attendant, ACD queue and ring group. There is also a free plan. onsip.com

*Ooma Office – Ooma Office provides small businesses with VoIP phone systems that don't require the purchase of special IP phones. Ooma's system can accommodate up to 20 users. The service includes unlimited calling in the United States and Canada, caller ID, a virtual receptionist, extension dialing, voicemail, call transfers, and a call log. Ooma also offers modes for after hours, ring groups, music on hold, conference bridges, voicemail forwarding and call forwarding. In addition, Ooma now offers a virtual-only system. ooma.com. Read our full review here.

PanTerra – PanTerra CloudUC is a comprehensive, business-class cloud unified communications solution. The system integrates advanced PBX services, real-time team collaboration tools, unified messaging, contact management, file sync and share, and business analytics into a single solution that's accessible from desktops to mobile devices. panterranetworks.com

Phone.com – Phone.com is a cloud-based phone system. Service plans include online account management, unlimited extensions, advanced call routing, conference calling, custom greetings, caller analytics, and voicemail and online management. Phone.com also offers iOS and Android mobile apps that allow employees to place and receive calls, get text notifications, listen to voicemails, and forward calls while out of the office. Upgraded options include call recording, on-hold music and voicemail transcription. phone.com

Phonebooth – Phonebooth is a division of Bandwidth.com, a nationwide supplier of voice and data communication services to small and midsize businesses. Phonebooth OnDemand is a full-featured business phone system. You pay for as many users as needed and add users as you grow. Businesses get unlimited local and long-distance calling, with a variety of business features, including auto-attendants, voice-to-email transcriptions, conference calling and call forwarding. phonebooth.com

PhonePower – PhonePower provides small businesses with VoIP-based phone systems. The service includes three-way calling, call forwarding, anonymous call rejection, call logs, call waiting, caller ID and caller ID block, virtual faxing, and the option to keep existing numbers. Additional highlights of PhonePower's business phone systems are its online call management system, online dashboard, block lists, voicemail-to-email options, and iPhone and Android mobile apps. phonepower.com

Phone.systems – Phone.systems is a full-featured, cloud-based virtual phone system. There is no equipment to purchase, maintain or upgrade, and its unlimited inbound and outbound calling plans eliminate long-distance charges and billing from third-party phone companies. The system includes voice menus, voicemail-to-email, conferencing, queuing, time and caller routing, internal extensions, dial tone access, and local and toll-free numbers in over 60 countries. phone.systems

*RingCentral – With a RingCentral cloud phone system, you plug IP desk phones and PCs into your internet connection and install the RingCentral mobile app on your employees' smartphones. These endpoints communicate with the RingCentral cloud platform for secure voice, fax, text, audio conferencing and HD video meetings. Service plans come with unlimited calling and online faxing in the United States and Canada. RingCentral offers small businesses conference calling, call forwarding, call screening, paging, call logs, missed-call notifications, music on hold, an auto-receptionist and more. In addition, the online account management system lets businesses control extensions, mobile devices, call logs and voicemail. Besides its office plans, RingCentral also provides contact center solutions and virtual phone systems for employers with mobile workforces. ringcentral.com. Read our full review here.

*ShoreTel – With ShoreTel, small businesses have the option of using a cloud-based or on-premise system that runs via the company's IP network, or a hybrid of the two. ShoreTel Connect Cloud offers an auto-attendant, full conferencing capabilities, instant messaging, video chat, call blocking, caller ID, call transfers and other features. In addition, the cloud-based system provides monitoring tools so that managers can listen in on their employees' calls if needed. ShoreTel also offers contact center phone systems. shoretel.com. Read our full review here.

TDS – TDS offers a variety of business VoIP and phone solutions, including hosted VoIP service and SIP and PRI trunking services. Among the features included in TDS's hosted VoIP service are instant messaging, virtual collaboration rooms, voicemail-to-email, Outlook integration, call logs, call notifications and call forwarding. tdsbusiness.com

Telzio – Telzio provides cloud-based phone systems with voice, mobile, SMS, fax and conferencing solutions for small and midsize businesses. The phone system works with a standard internet connection and any SIP-compatible IP phone or softphone. Telzio's various plans include call forwarding, custom call flows, interactive voice response, opening-hours filters, conference calls and on-hold music. The plans also offer local and toll-free numbers, call screening, voicemail, caller ID, call logs, and the ability to keep your current phone number. telzio.com

Toshiba – Toshiba offers on-premise and cloud-based VoIP phone systems for small businesses. The systems vary based on the number of users each business has; the largest plan can manage up to 1,000 users. The system offers basic calling features, including caller ID, extension numbers, call transfers, and customized voicemail and call-hold messages. Some plans provide text-to-speech service, an auto-attendant, voice response options and other advanced features. Toshiba also offers mobility and contact center solutions. telecom.toshiba.com

Tresta – Tresta doesn't require any special phones or hardware. You can set up and manage the phone system entirely online. After setting up the system, you can route calls to any phone. Tresta features auto-attendants, voicemail, call recording, and web, iOS and Android apps. tresta.com

Verizon – Verizon offers VoIP phone systems, unified communications systems and contact center services. Its VoIP offerings include IP trunking, IP integrated access, Virtual Communications Express and business connection services. The company can help integrate your voice and data traffic and provide a platform for layering networking products to support unified communications and collaboration (UC&C) solutions. verizonenterprise.com

Virtual PBX – Virtual PBX's product offerings include hosted VoIP, disaster recovery, and phone, fax and email integration. The company's office plans are based on the number of lines needed. This service offers unlimited minutes and extensions, local and toll-free numbers, virtual receptionists, dial-by-name directories, virtual faxing, music on hold, information on hold, day and night modes, and a web-based management system. It also offers small businesses call blocking, supervised call transfers and multistage dialing. virtualpbx.com

VoIPstudio – VoIPstudio is a cloud-based business phone system.  The system offers a host of features, including unlimited calling, number portability, virtual numbers, music on hold, conference calling, follow me, extension dialing, voicemail, ring groups, call queues and call barging. VoIPstudio also integrates with Salesforce, Oracle Sales Cloud and Microsoft Dynamics CRM software. voipstudio.com

VoIPX – VoIPX is a cloud-based phone system and service provider for customers across the United States. The system includes more than 50 standard features, including auto-attendants, follow me, call recording, call blocking, successive or simultaneous ringing, voicemail-to-email, and customized on-hold music. In addition, each customer receives a free phone when they sign a contract with VoIPX. The company has a 24/7 U.S.-based customer support team. voipxpbx.com

Vonage – Vonage offers cloud-based phone systems designed specifically for businesses with fewer than 50 employees. Some of the system's more popular features are a virtual receptionist, paperless fax, visual voicemail and online administration portal. Other features include music on hold, conference calling, click-to-dial, and a mobile app for iOS and Android devices. business.vonage.com

Windstream – Windstream Hosted Communication is an IP business phone system that includes collaboration, mobility and continuity, allowing small businesses to be accessible to their customers at all times. The system features seamless integration between PCs, landlines, tablets and mobile phones, and the option to use one number across all devices. smallbusiness.windstream.com

Xblue – Xblue digital and VoIP phone systems' features like hold, call transfer, conferencing, and intercom are already set up and ready to use when you first turn on your new system. Even voicemail is ready to receive messages on every phone as soon as the phone is connected to the system. Xblue's systems are hybrids, because they support both standard telephone company lines and internet-based VoIP lines. The two types of lines can be used at the same time. The company also offers cloud VoIP line service with no contracted period or early termination fee. xbluenetworks.com

Zultys – Zultys is an all-in-one IP business phone system that integrates voice, video, data and mobility. The company offers both cloud-based and on-premise phone systems. Zultys MXvirtual is a fully integrated, unified communications solution and IP phone system that integrates voice, video, data, and mobility to optimize collaboration and communications for businesses of all sizes. The MX250 system is a feature-rich, enterprise-class business IP telephony system that supports high-quality VoIP and unified communications services for up to 250 users, while the MX-SE is an IP phone system that enables VoIP and unified communications services for up to 50 users in a smaller office or branch-location environment. zultys.com

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