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Avaya one-X [EOL] vs ShoreTel Sky [EOL] comparison

Avaya and Mitel are both solutions in the Unified Communications category. Additionally, 100% of Avaya users are willing to recommend the solution, compared to 80% of Mitel users who would recommend it.
Avaya one-X [EOL]
Read 1 Avaya one-X [EOL] review
    100% willing to recommend
    ShoreTel Sky [EOL]
    Read 7 ShoreTel Sky [EOL] reviews
      80% willing to recommend
       

      Comparison Buyer's Guide

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      Executive Summary
      We performed a comparison between Avaya one-X [EOL] and ShoreTel Sky [EOL] based on real PeerSpot user reviews.

      Find out what your peers are saying about Cisco, 3CX, Digium and others in Unified Communications.

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      To learn more, read our detailed Unified Communications Report (Updated: March 2026).
      Buyer's Guide
      Unified Communications
      March 2026
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      Helped 885,728 peers since 2012

      Review summaries and opinions

      We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
       

      Categories and Ranking

      Avaya one-X [EOL]
      Average Rating
      8.0
      Number of Reviews
      1
      Ranking in other categories
      No ranking in other categories
      ShoreTel Sky [EOL]
      Average Rating
      7.8
      Reviews Sentiment
      4.5
      Number of Reviews
      7
      Ranking in other categories
      No ranking in other categories
       

      Featured Reviews

      KF
      Kari Flor
      Manager, Telecommunications at Gyrus ACMI - Olympus
      Allows users to be on the move and still provide them with the ability to answer their desk phone
      one-X Communicator (aka softphone on computer) has enabled employees to work from anywhere, and have their desk phone with them, as long as they have a headset.  We also use one-X Mobile for tech support and sales force employees one-X Communicator and one-X Mobile applications have assisted the…
      Read full review
      it_user269988 - PeerSpot reviewer
      it_user269988
      Office Manager with 51-200 employees
      The Service Portal is useful feature, but there are occasional outages.
      Phone Assistant is very useful, as is the Service Portal Occasional outages, but they're usually resolved very quickly. Customer Service: Customer service is generally responsive and courteous. Technical Support: Technical support folks are generally knowledgeable and helpful. We moved to VoIP…
      Read full review

      Quotes from Members

      We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
       

      Pros

      "one-X Communicator and one-X Mobile applications have assisted the organization in receiving higher work/life balance scores by enabling employees to work from home, office and avoiding long commutes."
      "We moved to VoIP a little over five years ago, after having a traditional POTS system, and it was a great improvement in terms of capability and service."
      "We have 15 branches that are now connected as though we are housed in the same building."
      "We rely on using ShoreTel's Phone Assistant as an integral part of our company and how it functions."
      "Using Shortel sky has been great for our company."
      "Allows us to work interactively through different locations."
      "The Portal administrator tool is very easy to navigate and understand; this has to be my favorite feature."
      "With the reporting available from Shoretel we were able to adjust our staff scheduling and decrease average hold times from 60 seconds to 30 seconds."
       

      Cons

      "One-X Mobile employees don't like that when they make a call from their mobile device using the app, the system calls them back before actually placing the call, they would like the call to just go out."
      "The portal is very good, but could use more function and streamline, especially in the call flow section."
      "The experience does not feel "Unified." With the recent acquisition of M5 they acquired a bunch of new features, but have not been able to make all UC features available from one website or one program."
      "Some intermittent connectivity issues are inherent with VOIP systems."
      "Occasional outages, but they're usually resolved very quickly."
      "Perhaps allowing more control over user functions from the customer portal, otherwise the solution is a good fit."
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      Company Size

      By reviewers
      Large Enterprise
      Midsize Enterprise
      Small Business
      No data available
      By reviewers
      Company SizeCount
      Small Business6
      Large Enterprise1
       

      Comparisons

      No data available
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      Cisco Unified Communications vs ShoreTel Sky [EOL] Logo
      Cisco Unified Communications vs ShoreTel Sky [EOL]
      Compared 19% of the time
      More ShoreTel Sky [EOL] Competitors
       

      Product Reports

      Buyer's Guide
      Unified Communications
      March 2026
      Avaya one-X [EOL] reportDownload Avaya one-X [EOL] product report
      Buyer's Guide
      Unified Communications
      March 2026
      ShoreTel Sky [EOL] reportDownload ShoreTel Sky [EOL] product report
       

      Also Known As

      one-X
      No data available
       

      Overview

      Avaya one-X Portal is a web-based unified communications client that consolidates access to critical voice applications in a simple consistent interface. Avaya one-X Portal is implemented and managed centrally and does not require software to be installed on user PCs. It brings together control of telephony (Avaya Aura Communication Manager), conferencing (Avaya Meeting Exchange Enterprise), and messaging (Avaya Modular Messaging with the Avaya Message Storage Server).
      Avaya

      ShoreTel Sky have some useful features: ShoreTel Sky Communicator turns conference calls into active web sharing with video, presentation mode and more. ShoreTel Sky Mobility keeps you connected with deskphone features and functionality everywhere. ShoreTel Sky Advanced Application integrations amplify and enhance CRM and ERP functionality and ShoreTel Sky Contact Center improves the quality and quantity of profitable customer contacts.

      Mitel
       

      Sample Customers

      Arkadin, Linamar, Sochi 2014 Olympic Winter Games, Tata Technologies, Madison County Schools, I.R.I.S. Group, Zahlke, Alliance Inc., TransDiesel, Sun Life Financial
      Abacus Service Corporation, AIPAC, Airlie Womens Clinic, All Erection Crane And Rental Corporation, Aquent, Aspire, Bonobos, Brooklyn Brewery, Cable Scope, Caduceus
      Buyer's Guide
      Unified Communications
      March 2026
      Download Free Report
      Find out what your peers are saying about Cisco, 3CX, Digium and others in Unified Communications. Updated: March 2026.
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      We monitor all Unified Communications reviews to prevent fraudulent reviews and keep review quality high. We do not post reviews by company employees or direct competitors. We validate each review for authenticity via cross-reference with LinkedIn, and personal follow-up with the reviewer when necessary.