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Microsoft has revised its notes on how Office extends ISO/IEC 29500 57 times since 2009; the core standard text dates from 2016. Why…
6 of 9 unified communications software ranked on evidence in the Q4 2026 edition.
Between them, the 9 unified communications software on this page cover chat / messaging (6), mobile access (6), contact management (6) and audio / video conferencing (5). 9 of them have written a profile you can read before you get in touch.
TrustList ranking
Q4 2026 edition
6 of 9 unified communications software ranked on evidence held on 12 October 2026: client reviews, vetting, awards and facts each business states on its own website, which we read and date. Nobody pays to be placed.
Positions are fixed for the quarter; the next edition is due in January 2027.

Chat / Messaging · Mobile Access · Contact Management
ClickSend is a business messaging service that covers text messages, email, voice calls, fax and physical post.
Why #1: Uptime SLA · No major incidents in 90 days (status page), as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.

Surveys & Feedback · Third Party Integration · Mobile Access
Workvivo is an employee experience platform that works as a company social network, intranet and mobile app in one place.
Why #2: No major incidents in 90 days (status page) · ISO 27001, SOC 2 Type II · Placed below first here: a listing leads at most 5 rankings, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.

Audio / Video Conferencing · Chat / Messaging · Third Party Integration
Rocket.Chat is an open source communications platform that combines team messaging, voice, video and customer conversations in one system.
Why #3: ISO 27001, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.

Audio / Video Conferencing · Chat / Messaging · Surveys & Feedback
Whispir is a cloud-based communications platform. It brings channels such as SMS, email, WhatsApp and voice into one place so organisations can send automated, two-way messages to…
Why #4: 2 major incidents in 90 days (status page)
Not yet on record: client reviews, vetting.

Interactive Voice Response (IVR) · Call Recording · Voice Mail
Noble CC is the contact centre software line from Noble Systems Corporation, which has worked in customer communications since 1989.
Why #5: Launched 1989, as stated on its own website, read 5 Oct 2026
Not yet on record: client reviews, vetting.

Chat / Messaging · Mobile Access · Contact Management
ParentSquare is a communication platform for schools in the United States.
Why #6: 2 major incidents in 90 days (status page)
Not yet on record: client reviews, vetting.

Audio / Video Conferencing · Interactive Voice Response (IVR) · Mobile Access
Tinkle is a cloud business phone system aimed at companies in the UK.

Audio / Video Conferencing · Chat / Messaging · Surveys & Feedback
pimentaCHAT is a unified collaboration and communication tool for organisations. It brings team messaging and calls into one product that can carry the customer's own branding.

Audio / Video Conferencing · Chat / Messaging · Call Recording
OfficeSuite UC is a cloud-based unified communications service from Windstream Enterprise. It brings collaboration and productivity tools together for businesses.
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