Best VoIP Providers - Page 8

How Many VoIP Providers Products Does G2 Track?

Total Products under this Category: 481

Category Stats (Sep 2026)

  • Average Rating: 4.38/5 The average rating of products in this category, based on all submitted ratings
  • Top Trending Product: Phone2 (+1.96%) - Among all products in this category, Phone2 recorded the largest rating increase compared to last month

Last updated: September 01, 2026

How Does G2 Rank VoIP Providers Products?

Why You Can Trust G2's Software Rankings:

  • 30 Analysts and Data Experts
  • 61,600+ Authentic Reviews
  • 481+ Products
  • Unbiased Rankings

G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category.

G2 Grid® for VoIP Providers

G2 Grid® for VoIP Providers plotting products by satisfaction and market presence

Highlighted products: RingEX, Nextiva, Zoom Phone, Quo, Dialpad Connect, Webex Calling, Webex Suite, and Aircall.

Underlying data: [Grid® JSON](https://www.g2.com/categories/voip-providers/grids.json?focus%5B%5D=ringex&focus%5B%5D=nextiva&focus%5B%5D=zoom-zoom-phone&focus%5B%5D=quo-quo&focus%5B%5D=dialpad-connect&focus%5B%5D=webex-calling&focus%5B%5D=cisco-webex-suite&focus%5B%5D=aircall)

ASTPP - A Smart Telephony Platform

For many years, ASTPP has been empowering various VoIP businesses and service providers with its amazing open source VoIP solutions. It is regarded as one of the top VoIP billing solutions and the #1 open source FreeSWITCH-driven Class 4/5 Softswitch Platform, which automates invoicing and billing processes completely. ASTPP is one of few solutions that support the N-level reseller structure. It uses cutting edge technologies like FreeSWITCH and OpenSIPs as core technologies to provide the most robust, reliable, and scalable solutions. ASTPP is a smart telephony platform, which has a suite of smart VoIP telephony solutions to offer to service providers and businesses, including, but not limited to: -Class 4 Softswitch -Class 5 Softswitch -Multi tenant IP PBX solution -Calling card solution -Virtual faxing solution -Virtual numbers solution -Routing & Billing Solution ASTPP has a team of versatile VoIP consultants and developers that provides various services in different VoIP technologies: -Consultancy -Development -Deployment -Support -ASTPP Training & Certification -And more ASTPP is a one stop VoIP solution for ITSPs, VoIP service providers, wholesale providers, and any other business.

Average Rating: 4.6/5.0

Total Reviews: 7

How Do G2 Users Rate ASTPP - A Smart Telephony Platform?

  • Has the product been a good partner in doing business?: 7.8/10 (Category avg: 8.8/10)
  • Phone Calls: 9.3/10 (Category avg: 9.1/10)
  • VOiP Number: 9.3/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 8.3/10 (Category avg: 8.6/10)

Who Is the Company Behind ASTPP - A Smart Telephony Platform?

  • Seller: ASTPP
  • Year Founded: 2013
  • HQ Location: Ahmedabad, IN
  • LinkedIn® Page: www.linkedin.com
    1 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 88% Small, 13% Medium

What Do G2 Reviewers Say About ASTPP - A Smart Telephony Platform?

AI-generated summary from verified user reviews

Pros
  • Users find ASTPP's platform to be easy to use, with a user-friendly interface and excellent community support.
  • Users highlight the easy access to ASTPP, praising its user-friendly interface and open-source customization options.
  • Users value the user-friendly interface of ASTPP, praising its accessibility and multilingual support.
  • Users value the easy-to-use VoIP solutions and appreciate the open-source customization and community support offered by ASTPP.
  • Users find ASTPP's easy integration useful, allowing straightforward setup and tailored configurations to meet their needs.
Cons
  • Users are dissatisfied with the customer support, noting it needs improvement to enhance the overall experience.
  • Users express concerns about time constraints, noting delays in bill creation and inadequate customer support experience.

What Are Recent G2 Reviews of ASTPP - A Smart Telephony Platform?

AT&T Office@Hand

AT&T Office@Hand is a flexible cloud-based solution that provides voice, fax, text messaging, and audio and video conferencing so workers can be more productive in the office or on the go.

Average Rating: 4.1/5.0

Total Reviews: 11

How Do G2 Users Rate AT&T Office@Hand?

  • Has the product been a good partner in doing business?: 7.3/10 (Category avg: 8.8/10)
  • Phone Calls: 10.0/10 (Category avg: 9.1/10)
  • VOiP Number: 10.0/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 10.0/10 (Category avg: 8.6/10)

Who Is the Company Behind AT&T Office@Hand?

  • Seller: AT&T Inc.
  • Year Founded: 1876
  • HQ Location: Dallas, TX
  • Twitter: @ATT
    876,351 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    195,339 employees on LinkedIn®
  • Ownership: NYSE: T

Who Uses This Product?

  • Company Size: 56% Small, 33% Medium

What Do G2 Reviewers Say About AT&T Office@Hand?

AI-generated summary from verified user reviews

Pros
  • Users love the ease of use of AT&T Office@Hand, enhancing remote work and integration across devices.
  • Users enjoy the easy communication of AT&T Office@Hand, seamlessly integrating various collaboration tools for better productivity.
  • Users appreciate the seamless team collaboration of AT&T Office@Hand, boosting communication and productivity from a single platform.
  • Users appreciate the enhanced communication provided by AT&T Office@Hand, streamlining calls, faxes, and team collaboration in one platform.
  • Users appreciate the cross-platform compatibility of AT&T Office@Hand, allowing seamless integration across devices for remote work.
Cons
  • Users report experiencing call drops and glitches in the mobile app, particularly in areas with poor signal.
  • Users experience glitches in the mobile app and note occasional drops in call quality due to low signals.
  • Users report occasional performance issues with video conferencing features that slow down their experience.
  • Users report poor call quality with AT&T Office@Hand, particularly in low-signal areas affecting communication efficiency.
  • Users experience slow video conferencing features occasionally, which can impact their overall satisfaction with the service.

What Are Recent G2 Reviews of AT&T Office@Hand?

What Are G2 Users Discussing About AT&T Office@Hand?

Hosted PBX Business Phone System

Aancall is a global UCaaS and CCaaS provider delivering unified communications and cloud contact center solutions powered by AI. The platform enables businesses to connect, collaborate, and engage customers through voice, video, messaging, and intelligent call management. Aancall provides high-quality VoIP services, including SIP trunking in 120+ countries and DID numbers across 65+ countries, ensuring reliable global reach and local presence. With AI-driven capabilities such as smart routing, call analytics, automation, and customer insights, Aancall helps organizations improve efficiency, enhance customer experience, and scale communications securely and seamlessly. Designed for enterprises, startups, and service providers, Aancall combines global connectivity, advanced AI, and cloud-based communications into one powerful platform.

Average Rating: 4.8/5.0

Total Reviews: 8

How Do G2 Users Rate Hosted PBX Business Phone System?

  • Has the product been a good partner in doing business?: 10.0/10 (Category avg: 8.8/10)
  • Phone Calls: 10.0/10 (Category avg: 9.1/10)

Who Is the Company Behind Hosted PBX Business Phone System?

  • Seller: Aancall
  • HQ Location: Wyoming USA
  • LinkedIn® Page: www.linkedin.com
    1 employees on LinkedIn®
  • Phone: 3074106456

Who Uses This Product?

  • Company Size: 63% Small, 13% Large

What Do G2 Reviewers Say About Hosted PBX Business Phone System?

AI-generated summary from verified user reviews

Pros
  • Users appreciate the easy access of the Hosted PBX Business Phone System, enhancing their communication experience.
  • Users value the seamless calling experience with easy access and Teams integration in the Hosted PBX system.
  • Users value the excellent customer support of Hosted PBX, receiving prompt assistance whenever needed.
  • Users enjoy the ease of use of the Hosted PBX Business Phone System, thanks to its simple dashboard and setup.
  • Users appreciate the easy access of the Hosted PBX Business Phone System, enhancing convenience with seamless Teams integration.
Cons
  • Users note the poor contact management, citing issues with prefixes and a lack of integration with Teams.
  • Users face dialing issues like needing prefixes and lack of balance visibility, which hinders overall convenience.
  • Users note inadequate AI integration and express the need for better features and display options in the system.
  • Users find integration issues frustrating, particularly with the need for prefixes and lack of Teams compatibility.
  • Users find the missing features hinder usability, expressing a need for enhancements in balance visibility and integration.

What Are Recent G2 Reviews of Hosted PBX Business Phone System?

NobelBiz Voice Carrier Network

The NobelBiz Voice Carrier Network is the only VoIP interconnected provider built to service contact-center-specific traffic, with multiple redundancies across the globe. As a result, our telecom network offers uninterrupted uptime and an impressive geographical footprint, delivering the best possible voice quality at a fair price. Because we focus solely on the contact center niche, all the features and support processes were fine-tuned to maximize the efficiency, quality, and demands of the call center industry. In addition, the NobelBiz Voice Carrier Network features a multitude of optional productivity tools such as local caller ID solutions, compliance safety nets, number management, and a web-based auto-attendant platform, to name but a few.

Average Rating: 4.4/5.0

Total Reviews: 10

How Do G2 Users Rate NobelBiz Voice Carrier Network?

  • Has the product been a good partner in doing business?: 10.0/10 (Category avg: 8.8/10)
  • Phone Calls: 10.0/10 (Category avg: 9.1/10)
  • VOiP Number: 10.0/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 10.0/10 (Category avg: 8.6/10)

Who Is the Company Behind NobelBiz Voice Carrier Network?

  • Seller: NobelBiz
  • Year Founded: 2005
  • HQ Location: Cheyenne, WY
  • Twitter: @NobelBiz
    569 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    30 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 60% Small, 30% Large

What Do G2 Reviewers Say About NobelBiz Voice Carrier Network?

AI-generated summary from verified user reviews

Pros
  • Users value the reliability of NobelBiz Voice Carrier Network, ensuring consistent call quality and efficient caller ID management.
  • Users commend the LT Buckets Rotation feature of NobelBiz for enhancing connectivity and reducing spam likelihood.
  • Users value the high call quality of NobelBiz Voice Carrier Network for both outbound campaigns and everyday calls.
  • Users commend the robust connectivity options of NobelBiz Voice Carrier Network, ensuring reliable calling experiences.
  • Users commend the excellent customer service of NobelBiz Voice Carrier Network, highlighting promptness and efficiency as key benefits.
Cons
  • Users find the purchase process for DIDs problematic, as it can lead to receiving numbers intended for other companies.
  • Users find the high cost of NobelBiz Voice Carrier Network still burdensome despite reduced outbound rates over the years.
  • Users report number issues when purchasing DIDs, leading to complications with misallocated numbers.

What Are Recent G2 Reviews of NobelBiz Voice Carrier Network?

What Are G2 Users Discussing About NobelBiz Voice Carrier Network?

Thirdlane Connect

Thirdlane Connect is a white-label team collaboration tool with voice, omnichannel messaging, and video for MSPs, service providers, and telecom resellers on Thirdlane’s multi-tenant UCaaS platform. Deliver branded calling, chat, and meetings across web, desktop, and mobile with APIs and CRM integrations. Main features: - VoIP calling, call recording, transfer, and hold - Team chat for 1:1 and groups - Video meetings with screen sharing - Presence and status sync - File sharing and inline media - Click-to-call and CRM screen pops - Branded apps for web, Windows, macOS, Linux, iOS, and Android See how Thirdlane helps MSPs, UCaaS providers, resellers, and enterprises deliver white-label multi-tenant communications. Request a live demo today: https://www.thirdlane.com

Average Rating: 4.3/5.0

Total Reviews: 22

How Do G2 Users Rate Thirdlane Connect?

  • Has the product been a good partner in doing business?: 8.3/10 (Category avg: 8.8/10)

Who Is the Company Behind Thirdlane Connect?

  • Seller: Thirdlane
  • Year Founded: 2003
  • HQ Location: Fairfax, US
  • Twitter: @thirdlanepbx
    47 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    4 employees on LinkedIn®
  • Ownership: Third Lane Technologies, LLC

Who Uses This Product?

  • Company Size: 43% Small, 29% Medium

What Do G2 Reviewers Say About Thirdlane Connect?

AI-generated summary from verified user reviews

Pros
  • Users love the ease of use of Thirdlane Connect, making communication seamless for everyone in the team.
  • Users value the easy communication of Thirdlane Connect, enjoying seamless calls, chats, and meetings in one platform.
  • Users value the consolidated communication tools in Thirdlane Connect, enhancing collaboration with seamless integration and ease of use.
  • Users find the easy setup of Thirdlane Connect allows for quick integration and smooth communication from the start.
  • Users value the intuitive interface of Thirdlane Connect, enhancing workflows and making communication seamless across all devices.
Cons
  • Users face a steep learning curve with Thirdlane Connect, making initial setup and navigation challenging for non-technical users.
  • Users often struggle with the difficult setup of Thirdlane Connect, as it demands technical expertise for configuration.
  • Users find the steep learning curve challenging, particularly for non-technical users during initial setup and navigation.
  • Users struggle with the steep learning curve and dated interface of Thirdlane Connect, complicating initial setup and navigation.
  • Users struggle with the difficult interface of Thirdlane Connect, finding setup and navigation overwhelming and challenging.

What Are Recent G2 Reviews of Thirdlane Connect?

What Are G2 Users Discussing About Thirdlane Connect?

Velocity Voice

By switching your telephone service over to Velocity Voice you can save your business thousands of dollars annually when compared to a traditional telephone line or analog phone system

Average Rating: 4.0/5.0

Total Reviews: 7

How Do G2 Users Rate Velocity Voice?

  • Phone Calls: 9.2/10 (Category avg: 9.1/10)
  • VOiP Number: 9.2/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 9.2/10 (Category avg: 8.6/10)

Who Is the Company Behind Velocity Voice?

  • Seller: Velocity Voice
  • HQ Location: Dallas, Texas
  • Twitter: @velocityvoice1
    3 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    1 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 71% Medium, 43% Large

What Are Recent G2 Reviews of Velocity Voice?

What Are G2 Users Discussing About Velocity Voice?

Diabolocom

Diabolocom is a leading European provider of AI-first cloud contact center and customer experience solutions. Our platform helps organizations manage omnichannel customer interactions at scale while improving service quality, agent productivity, and operational efficiency. Built on proprietary AI technologies, native telecom infrastructure, and advanced CRM integrations, Diabolocom helps customer service and sales teams deliver faster, smarter, and more personalized interactions. Our all-in-one platform supports inbound and outbound communications, high-volume call management, auto-dialing, workflow automation, real-time monitoring, and AI-powered assistance for agents and supervisors. It helps teams manage every customer interaction more efficiently, from first contact to final resolution. Diabolocom provides the essential features businesses need to manage customer interactions effectively, while continuously innovating with sovereign AI solutions designed for customer service and sales teams. Our AI-powered solutions include: - Interactive Virtual Agent, - Agent Assist, - Augmented Quality Monitoring. Interactive Virtual Agent helps businesses provide 24/7 customer support. It answers customer requests automatically and can be configured easily through Diabolocom’s interface. When human assistance is needed, the interaction can be transferred smoothly to an agent. Agent Assist supports agents in real time during customer conversations. It combines conversation analytics, automated call summaries, next-best-action recommendations, form completion, knowledge base access, and automated workflows. This helps agents save time, reduce manual work, and provide more accurate answers. Augmented Quality Monitoring helps supervisors evaluate customer interactions at scale. With AI, teams can review far more calls than would be possible manually. They can identify coaching opportunities, detect quality trends, and monitor performance through clear dashboards. Together, these capabilities help businesses automate repetitive tasks, improve quality management, strengthen customer engagement, and make faster, data-driven decisions. Diabolocom’s innovation has been recognized by Frost & Sullivan with the 2024 Product Leadership Award and the 2026 European Technology Innovation Leadership Award. For over 20 years, Diabolocom has supported more than 400 clients and now operates in over 60 countries, with 175+ employees across 8 global offices.

Average Rating: 4.2/5.0

Total Reviews: 34

How Do G2 Users Rate Diabolocom?

  • Has the product been a good partner in doing business?: 8.5/10 (Category avg: 8.8/10)
  • Phone Calls: 6.7/10 (Category avg: 9.1/10)
  • VOiP Number: 7.8/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 5.0/10 (Category avg: 8.6/10)

Who Is the Company Behind Diabolocom?

  • Seller: Diabolocom
  • Company Website:
  • Year Founded: 2005
  • HQ Location: Paris, FR
  • LinkedIn® Page: www.linkedin.com
    179 employees on LinkedIn®

Who Uses This Product?

  • Top Industries: Consumer Services
  • Company Size: 58% Medium, 31% Small

What Do G2 Reviewers Say About Diabolocom?

AI-generated summary from verified user reviews

Pros
  • Users appreciate the ease of use of Diabolocom, benefiting from intuitive interfaces and seamless CRM integration.
  • Users value the exceptionally responsive customer support from Diabolocom, ensuring a smooth implementation and ongoing assistance.
  • Users appreciate the customization capabilities of Diabolocom, enabling tailored integrations and seamless adaptation to their needs.
  • Users praise the easy implementation of Diabolocom, benefiting from responsive support and quick integration with existing systems.
  • Users appreciate the efficiency of Diabolocom, seamlessly integrating with systems and enhancing agent productivity.
Cons
  • Users find the missing features in Diabolocom limit integration and hinder the customization of their processes.
  • Users find it challenging to reach customer service support, which hinders their ability to optimize workflows effectively.
  • Users find the delays in updates frustrating, particularly affecting productivity during critical work hours.
  • Users find the rigid pre-configured workflows of Diabolocom limit customization, complicating customer service processes.
  • Users find the limited customization of Diabolocom restricts adapting workflows to their specific customer service needs.

What Are Recent G2 Reviews of Diabolocom?

Opus Cloud Telephony

Hosted or Cloud Telephony is being adopted by an increasing number of organisations as a means to refresh to their communications technology and a boost to competitive advantage, without the need for large capital investment.

Average Rating: 4.6/5.0

Total Reviews: 6

How Do G2 Users Rate Opus Cloud Telephony?

  • Has the product been a good partner in doing business?: 8.9/10 (Category avg: 8.8/10)
  • Phone Calls: 10.0/10 (Category avg: 9.1/10)
  • VOiP Number: 9.2/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 9.6/10 (Category avg: 8.6/10)

Who Is the Company Behind Opus Cloud Telephony?

Who Uses This Product?

  • Company Size: 83% Large, 17% Small

What Are Recent G2 Reviews of Opus Cloud Telephony?

What Are G2 Users Discussing About Opus Cloud Telephony?

smrtphone

smrtPhone is an all-in-one phone system that allows sales-driven businesses to make more calls, send more texts, and close more deals. The cloud-based phone, multi-line power dialer, integrated AI tools that capture call summaries, keywords, and outcomes, full featured mobile app, customizable call flows, and robust suite of user management tools flex and grow with you. Focused on delivering deep integration with your CRM, smrtPhone powers greater automation, reduces time spent on clerical tasks, and gives valuable insight enabling you to do business better.

Average Rating: 3.9/5.0

Total Reviews: 6

How Do G2 Users Rate smrtphone?

  • Has the product been a good partner in doing business?: 6.7/10 (Category avg: 8.8/10)
  • Phone Calls: 5.6/10 (Category avg: 9.1/10)
  • VOiP Number: 5.0/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 5.0/10 (Category avg: 8.6/10)

Who Is the Company Behind smrtphone?

Who Uses This Product?

  • Top Industries: Real Estate
  • Company Size: 100% Small

What Do G2 Reviewers Say About smrtphone?

AI-generated summary from verified user reviews

Pros
  • Users appreciate the ease of use of Smrtphone, making transitions and customer support seamless and efficient.
  • Users value the easy communication features of smrtPhone, making interactions with prospects more efficient.
  • Users appreciate the easy integration of smrtPhone with CRMs, enhancing communication and managing interactions effectively.
  • Users enjoy the click-to-call functionality on smrtphone, enhancing their communication efficiency.
  • Users enjoy the click-to-call functionality of smrtPhone, enhancing their communication efficiency directly from their CRM.
Cons
  • Users find the expensive cost of smrtPhone to be unjustified given its integration and functionality issues.
  • Users highlight the high cost of smrtPhone, feeling it's a poor investment for the features provided.
  • Users express concern about internet dependency affecting functionality and accessibility of smrtPhone's services and support.
  • Users face frequent call connectivity issues with Smrtphone, leading to frustration and lack of support for resolution.
  • Users experience call drops and report issues with their number being flagged as spam.

What Are Recent G2 Reviews of smrtphone?

Twilio Flex

Modernize your customer and employee experience in place by embedding voice, SMS, WhatsApp, and email into the apps you already use. Twilio Flex orchestrates interactions across channels, AI-driven automation, and human agents so conversations stay connected and context stays intact. Human agents get a complete view of every interaction without switching between tools or piecing together fragmented data. With a composable architecture and User + Usage pricing, you only pay for what you use and control how you build and scale customer experiences.

Average Rating: 4.1/5.0

Total Reviews: 31

How Do G2 Users Rate Twilio Flex?

  • Has the product been a good partner in doing business?: 8.3/10 (Category avg: 8.8/10)
  • Phone Calls: 8.3/10 (Category avg: 9.1/10)
  • VOiP Number: 9.2/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 10.0/10 (Category avg: 8.6/10)

Who Is the Company Behind Twilio Flex?

  • Seller: Twilio
  • Year Founded: 2008
  • HQ Location: San Francisco, CA
  • Twitter: @twilio
    81,644 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    7,801 employees on LinkedIn®
  • Ownership: NYSE: TWLO

Who Uses This Product?

  • Top Industries: Information Technology and Services, Insurance
  • Company Size: 38% Medium, 30% Small

What Do G2 Reviewers Say About Twilio Flex?

AI-generated summary from verified user reviews

Pros
  • Users value the easy integration of Twilio Flex, which enhances operational efficiency and customization for their contact centers.
  • Users highlight the seamless integrations of Twilio Flex, enhancing efficiency and allowing for easy customization with existing tools.
  • Users love the easy chat integration of Twilio Flex, which enhances efficiency and user experience in contact centers.
  • Users appreciate the seamless chat integration in Twilio Flex, enhancing efficiency and overall contact center performance.
  • Users appreciate the high customizability of Twilio Flex, enabling tailored solutions for specific business needs.
Cons
  • Users find Twilio Flex has limited features, necessitating extensive customization and technical support for effective use.
  • Users highlight the missing functionality in Twilio Flex, citing limited UI and reporting tools without significant customization.
  • Users find Twilio Flex's complex features challenging to implement without substantial technical support and ongoing development resources.
  • Users find Twilio Flex's complexity challenging, requiring substantial technical support and customizations for optimal use.
  • Users find the complex processes of Twilio Flex challenging, requiring extensive technical support and customization to be effective.

What Are Recent G2 Reviews of Twilio Flex?

What Are G2 Users Discussing About Twilio Flex?

VoIP Phone Systems

RingOffice is a cloud solutions provider for businesses of all sizes. We offer voice services like Cloud Phone Systems and SIP Trunking; as well as cloud IT and network services. We focus on reliability and ease to use, making communication, collaboration, and work easier for businesses. With over 20 years of experience, we know what it takes to provide quality cloud services that help businesses succeed.

Average Rating: 4.4/5.0

Total Reviews: 6

How Do G2 Users Rate VoIP Phone Systems?

  • Has the product been a good partner in doing business?: 8.3/10 (Category avg: 8.8/10)
  • Phone Calls: 9.0/10 (Category avg: 9.1/10)
  • VOiP Number: 9.3/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 9.0/10 (Category avg: 8.6/10)

Who Is the Company Behind VoIP Phone Systems?

Who Uses This Product?

  • Company Size: 50% Medium, 50% Small

What Do G2 Reviewers Say About VoIP Phone Systems?

AI-generated summary from verified user reviews

Pros
  • Users find the ease of use of VoIP Phone Systems impressive, with fast connections and a user-friendly interface.
  • Users value the easy communication available with VoIP Phone Systems, facilitating global connectivity for various needs.
  • Users find the easy connection of VoIP Phone Systems enhances their experience with quick and user-friendly access.
  • Users love the user-friendly nature of VoIP Phone Systems, celebrating their ease of use and quick connectivity.
Cons
  • Users experience audio problems such as lag and voice issues during internet connectivity interruptions.
  • Users experience lag and voice issues during internet problems, impacting their overall experience with VoIP systems.

What Are Recent G2 Reviews of VoIP Phone Systems?

Avaya Unified Communications

Avaya Unified Communications (UC) is an integrated platform that consolidates multiple communication and collaboration channels into a single, cohesive system. Designed for modern enterprises, Avaya UC enables organizations to streamline communications across voice, video, messaging, and conferencing while supporting flexible work environments and seamless device mobility. Core Capabilities Avaya Unified Communications encompasses a comprehensive set of features including: Voice & Calling: VoIP, call forwarding, transfer, conferencing, and multi-line support Messaging & Presence: Instant messaging, presence awareness (showing who is available, busy, or offline), and SMS/fax capabilities Video Conferencing: Browser-based HD video conferencing with screen sharing, annotation tools, and personalized meeting rooms Collaboration: Team workspaces, calendar integration, contact management, and third-party application integration Deployment Models Avaya offers multiple UC solutions to suit different organizational needs: Avaya Cloud Office is a cloud-based Unified Communications as a Service (UCaaS) platform providing phones, apps, messaging, conferencing, video, and team meeting capabilities in a single, flexible offering. Available in Standard, Premium, and Ultimate subscription tiers, it delivers streamlined global management with minimal IT overhead. Avaya IP Office Subscription supports both traditional Telephony Users and advanced UC Users. UC Users gain mobility features including softphone applications, video calling, instant messaging, presence capabilities, and integrations with Salesforce, Outlook, and Microsoft Teams. Avaya Aura is a communications platform that can be deployed on-premises, in private cloud, or in hybrid configurations, providing a robust foundation for voice, video, messaging, and collaboration with integration for modern collaboration tools. Avaya Aura Private Cloud offers cloud-hosted UC bundles—Essentials, Advanced, and Ultra—with capabilities including telephony, voicemail, instant messaging, team conferencing, mobility, and seamless integration with Microsoft Teams and Zoom. Avaya Managed Services provides dedicated support for organizations seeking operational simplification, with tiered UC offerings and ongoing vendor management. Key Benefits Unified Experience: Single interface for all communication modes reduces context-switching and improves productivity Mobility: Work from anywhere with secure mobile access and multi-device call management Scalability: Solutions for small teams to large enterprises with flexible subscription and licensing models Integration: Seamless compatibility with Microsoft Teams, Zoom, Salesforce, and other business-critical applications Security: Enterprise-grade security with device enrollment, call detail recording, and compliance features Cost Efficiency: Cloud-based options reduce capital infrastructure investment and IT management overhead Summary Avaya Unified Communications serves organizations seeking modern, integrated communication platforms that support hybrid and remote work, reduce communication silos, and enable employees to collaborate effectively from any location. Whether deployed on-premises, in the cloud, or in hybrid configurations, Avaya UC provides the flexibility, reliability, and feature richness enterprises require.

Average Rating: 4.2/5.0

Total Reviews: 38

How Do G2 Users Rate Avaya Unified Communications?

  • Has the product been a good partner in doing business?: 8.9/10 (Category avg: 8.8/10)
  • Phone Calls: 8.3/10 (Category avg: 9.1/10)
  • VOiP Number: 10.0/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 7.8/10 (Category avg: 8.6/10)

Who Is the Company Behind Avaya Unified Communications?

  • Seller: Avaya
  • Year Founded: 2000
  • HQ Location: Morristown, NJ
  • Twitter: @Avaya
    36,704 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    11,753 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 60% Large, 24% Medium

What Do G2 Reviewers Say About Avaya Unified Communications?

AI-generated summary from verified user reviews

Pros
  • Users find the ease of use of Avaya Unified Communications enhances efficiency, streamlining their communication processes.
  • Users value the seamless communication features of Avaya UCaaS, enhancing collaboration and connectivity across the board.
  • Users value the high level of customizability in Avaya Unified Communications, enhancing their communication and productivity.
  • Users value the customization options in Avaya UCaaS, enhancing communication efficiency and flexibility for their needs.
  • Users value the easy implementation of Avaya Unified Communications, appreciating its intuitive handling and setup process.
Cons
  • Users face call drops and audio glitches with Avaya, impacting their communication experience significantly.
  • Users frequently experience connection issues with Avaya, leading to dropped calls and audio glitches during communication.
  • Users often face audio issues with Avaya, leading to dropped calls and frustrating lag during video conferences.
  • Users experience audio problems with Avaya, including missed calls and glitches, negatively impacting communication quality.
  • Users express frustration with call connectivity issues, noting that configuration is critical to prevent errors and drops.

What Are Recent G2 Reviews of Avaya Unified Communications?

Cytracom

Cytracom provides enterprise-grade Hosted VoIP and unified communications to businesses nationwide.Cytracom's VoIP solutions provide cost savings, mobility, scalability and reliability with a platform built on the most advanced cloud-based VoIP technology in the world, .

Average Rating: 4.1/5.0

Total Reviews: 5

How Do G2 Users Rate Cytracom?

  • Has the product been a good partner in doing business?: 10.0/10 (Category avg: 8.8/10)
  • Phone Calls: 7.8/10 (Category avg: 9.1/10)
  • VOiP Number: 8.3/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 8.3/10 (Category avg: 8.6/10)

Who Is the Company Behind Cytracom?

  • Seller: Cytracom
  • Year Founded: 2008
  • HQ Location: McKinney, US
  • Twitter: @cytracom
    458 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    106 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 80% Small, 20% Large

What Do G2 Reviewers Say About Cytracom?

AI-generated summary from verified user reviews

Pros
  • Users value the exceptional support from Cytracom, making their experience and technology usage significantly more enjoyable.
  • Users appreciate the responsive customer service of Cytracom, enhancing their experience with proactive support and solutions.
  • Users value the exceptional customer support from Cytracom, which enhances their overall experience with the product.
  • Users value the exceptional support from Cytracom, enhancing their overall experience and satisfaction with the product.
  • Users commend the reliability of Cytracom, appreciating proactive support that enhances their overall experience.

What Are Recent G2 Reviews of Cytracom?

What Are G2 Users Discussing About Cytracom?

LinkedPhone

LinkedPhone is a versatile business phone system designed specifically for small business owners, entrepreneurs, and growing teams. It offers professional business phone numbers, VOIP (Voice Over IP) services, and cloud-based calling and texting through a user-friendly app available on iPhone, Android, and Web. LinkedPhone allows businesses to separate personal and professional calls, manage multiple phone numbers, and communicate seamlessly with clients from anywhere. LinkedPhone is ideal for businesses seeking a flexible, scalable communication solution without the need for traditional phone lines or complex setups. Whether you’re a solopreneur looking to establish a professional presence or a team needing a reliable communication system, LinkedPhone provides customizable plans that grow with your business. Key features include call forwarding, voicemail, call recording, and team collaboration tools, all designed to enhance productivity and ensure that business owners never miss a call. Key Benefits: Professional Business Numbers: Establish a professional image with dedicated business phone numbers. Mobility: Access your business communications from anywhere through the mobile app or web interface. Scalability: Flexible plans that grow with your business, from individual entrepreneurs. Enhanced Features: Includes call forwarding, voicemail, call recording, and more to streamline business operations. LinkedPhone is committed to helping small businesses communicate more effectively and professionally, enabling them to focus on what matters most—growing their business.

Average Rating: 3.5/5.0

Total Reviews: 5

How Do G2 Users Rate LinkedPhone?

  • Has the product been a good partner in doing business?: 8.3/10 (Category avg: 8.8/10)
  • Phone Calls: 8.9/10 (Category avg: 9.1/10)
  • VOiP Number: 8.3/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 6.7/10 (Category avg: 8.6/10)

Who Is the Company Behind LinkedPhone?

  • Seller: LinkedPhone
  • Year Founded: 2017
  • HQ Location: New York, US
  • Twitter: @LinkedPhoneApps
    172 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    21 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 100% Small

What Are Recent G2 Reviews of LinkedPhone?

LoopUp

LoopUp is redefining how multinational enterprises manage telephony on a global scale with Microsoft Teams. In a market where organizations typically rely on fragmented regional providers and complex telephony contracts, LoopUp offers a single, fully managed converged communications solution, deeply integrated with Microsoft Teams and spanning 136 countries. LoopUp delivers Microsoft Teams telephony through Operator Connect, Direct Routing, and BYOC solutions, giving enterprises the flexibility to deploy full PSTN replacement in 136 countries. We are a top provider for country coverage on Operator Connect and extend reach even further with our expertise in Direct Routing and BYOC solutions. About LoopUp LoopUp helps multinational enterprises consolidate how they buy and manage global Microsoft Teams telephony, offering phone numbers and full cloud-based PSTN replacement in more than 100 countries. LoopUp eliminates the need to manage multiple regional carriers, offering a single contract, consistent service delivery, and integrated Microsoft Teams voice – all backed by global design, deployment, and support. LoopUp is headquartered in London with operations worldwide. For more information, please visit: https://loopup.com

Average Rating: 4.4/5.0

Total Reviews: 23

How Do G2 Users Rate LoopUp?

  • Has the product been a good partner in doing business?: 9.4/10 (Category avg: 8.8/10)
  • Phone Calls: 9.6/10 (Category avg: 9.1/10)
  • VOiP Number: 9.2/10 (Category avg: 9.0/10)
  • Desk-to-Desk Calls: 9.2/10 (Category avg: 8.6/10)

Who Is the Company Behind LoopUp?

  • Seller: LoopUp
  • Year Founded: 2003
  • HQ Location: London, United Kingdom
  • Twitter: @LoopUp
    3,006 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    106 employees on LinkedIn®
  • Ownership: LSE:LOOP

Who Uses This Product?

  • Company Size: 52% Medium, 30% Large

What Do G2 Reviewers Say About LoopUp?

AI-generated summary from verified user reviews

Pros
  • Users value the clear and effective communication from LoopUp, resulting in smooth collaboration and support.
  • Users appreciate the convenience of LoopUp's easy administration and seamless call setup options, enhancing collaboration.
  • Users commend the responsive and professional customer support of LoopUp, enhancing their overall user experience.
  • Users find LoopUp's ease of use exceptional, enjoying clear interfaces and prompt support throughout their experience.
  • Users appreciate the quick and efficient problem-solving of LoopUp, highlighting professional support and seamless collaboration.
Cons
  • Users feel there is insufficient support during account management, particularly during the porting process, leading to confusion.
  • Users experience muffled audio in some calls, which detracts from the overall effectiveness of LoopUp.
  • Users find the complex porting process unclear, wishing for better communication and testing during the transition.
  • Users note the complex processes during porting that can lead to confusion and a lack of information.
  • Users find distractions from muffled sound and inconvenient linking processes during client invites with LoopUp.

What Are Recent G2 Reviews of LoopUp?

What Are G2 Users Discussing About LoopUp?

Neeraja Prakash
NP
Researched and written by Neeraja Prakash
Updated April 9, 2026