The CallTower Insider’s Guide
Everything we know about CallTower in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
CallTower
The Insider’s Guide
Business voice for Teams, Webex and Zoom, plus contact center
Every plan, grade, refund rule and rival among business phone systems, read from CallTower’s own pages.
Made by CallTower, Inc. · checked Nov 13, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from CallTower’s own pages, its app-store listings and our grades. Every fact in it is on CallTower’s page too, where it is kept up to date. Checked Nov 13, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
1.8
GPA, above 12 of the 77 other business phone systems we grade
CallTower sells cloud voice and contact center services built around Microsoft Teams, Cisco Webex and Zoom. It provides calling, SIP, texting and compliance add-ons, resells contact center platforms such as Five9 and Genesys Cloud, and sells mainly through channel partners.
To get you started, here are 7 things to know about CallTower, taken from its own pages and our grades.
No prices are published, and the platforms' own licenses are bought separately.
- 1
Best for business calling for Teams, Webex and Zoom
CallTower supplies phone service for Microsoft Teams, Webex and Zoom, plus contact center platforms.
- 2
It runs on Web
Web.
- 3
Teams, Webex and Zoom calling
Provides calling for Microsoft Teams through Operator Connect and Direct Routing, Webex Calling and Webex Dedicated Instance, and Zoom Phone.
- 4
Voice add-ons
Lists Dynamic E911, one-click failover, voice spam blocking, CRM integration, compliance recording and call analytics for Teams and Webex.
- 5
Texting and faxing
Offers texting for Microsoft Teams and for Webex Calling, a fax service, and CT SIP trunking.
- 6
A 1.8 GPA, above 12 of 77
That is against the other business phone systems we grade, on value, the free plan, features, ease of use and platforms.
- 7
Keep it
To replace CallTower you would be making phone numbers and calls carried over the phone network. That is not a weekend's work, with an AI app builder or without one.
CallTower at a glance
- Pricing
- Paid
- Free plan
- No
- Free trial
- None stated
- Runs on
- Web
- Made by
- CallTower, Inc.
- Category
- Business Phone Systems
- Our grade
- 1.8 GPA, weak
The report card
Best for business calling for Teams, Webex and Zoom
CallTower supplies phone service for Microsoft Teams, Webex and Zoom, plus contact center platforms. No prices are published, and the platforms' own licenses are bought separately.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | C | No pricing published; it goes through sales or channel partners. |
| Free plan and trial | F | No free plan and no free trial is offered on the pages we read. |
| Features | C | Calling for Teams, Webex and Zoom, voice add-ons, texting, faxing and contact center platforms. It needs those platforms' own licenses. |
| Ease of use | C | No store rating on record. It's sold through sales and partners. |
| Platforms and integrations | B | Web, with Teams, Webex, Zoom, Five9 and Genesys Cloud. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who CallTower is for
- Fits if your company already runs on Teams, Webex or Zoom
- Works for IT partners who resell business phone service
Who it is not for
- Skip it if you want a posted price, as quotes go through sales
- Watch out: the Teams, Webex or Zoom licenses are a separate cost
- Not for you if you want a standalone phone system, as it adds calling to other platforms
- Tight if you want to buy direct, as the listing shows it sells largely through resellers
Good to know
Good for
- Mid-size and larger companies that already use Teams, Webex or Zoom
- Buyers who want a carrier for Operator Connect or Direct Routing
Worth knowing
- No pricing is published, so pricing is unverified and goes through sales or channel partners.
- It supplies calling for other collaboration platforms, whose own licenses are bought separately.
- Partner, agency and MSP programs show it sells largely through resellers.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
CallTower's current pricing could not be confirmed from its own site.
No pricing published; it goes through sales or channel partners.
We could not confirm CallTower’s current prices from its own site, so this guide lists no plans. calltower.com has them.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Business voice for Teams, Webex and Zoom, plus contact center. Here is what it does, as its own site describes it, and what it covers: AI features, business phone line, business texting, online fax.
Calling for Teams, Webex and Zoom, voice add-ons, texting, faxing and contact center platforms.
- Teams, Webex and Zoom calling
- Provides calling for Microsoft Teams through Operator Connect and Direct Routing, Webex Calling and Webex Dedicated Instance, and Zoom Phone.
- Voice add-ons
- Lists Dynamic E911, one-click failover, voice spam blocking, CRM integration, compliance recording and call analytics for Teams and Webex.
- Texting and faxing
- Offers texting for Microsoft Teams and for Webex Calling, a fax service, and CT SIP trunking.
- Contact center platforms
- Supplies Five9, Genesys Cloud, Webex Contact Center and Zoom Contact Center, along with its own CT Contact Center and consulting services.
- Support and portal
- Lists 24/7/365 support, a service level agreement and the CallTower Connect portal for controlling services.
Where it runs
- Web
What it works with
- Microsoft Teams
- Webex
- Zoom
- Five9
- Genesys Cloud
CallTower is made by CallTower, Inc.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
12/77
Other business phone systems it is graded above
CallTower's GPA of 1.8 is higher than 12 of the 77 other business phone systems we grade, and level with 15.
It stands best on platforms and integrations (B, above 14 of 77) and worst on free plan and trial (F, above 0).
Each grade against the category
Every bar is all 78 business phone systems we grade, cut by the letter each got. CallTower’s own letter is outlined.
- CValue for moneyAbove 7 of 77
- FFree plan and trialAbove 0 of 77
- CFeaturesAbove 9 of 77
- CEase of useAbove 11 of 77
- BPlatforms and integrationsAbove 14 of 77
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
To replace CallTower you would be making phone numbers and calls carried over the phone network. That is not a weekend's work, with an AI app builder or without one.
That makes this kind of software worth paying for, not this one in particular: 50 of the 77 other business phone systems grade higher.
What you could not
- Phone numbers and calls carried over the phone network.
- Fax numbers connected to the phone network.
- Texts from a business number, registered with the carriers.
- It plugs into other products, Microsoft Teams, Webex and Zoom among them.
- AI features, unless you pay a model provider for each request yourself.
What this rests on. CallTower’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
RingCentral, Intermedia Unite, Nextiva, 8x8 and RingLogix
The 5 tools CallTower is most often weighed against, with where each one differs from it.
- 3.0GPA
RingCentral
Free trial · from $20/mo
Cloud phone system with texting, fax, video meetings and team chat.
- Only RingCentral lists macOS, Windows, iOS and Android apps.
- CallTower also covers online fax.
- RingCentral also covers transcription, team chat and video calls.
- 2.0GPA
Intermedia Unite
From $27.99/mo
Cloud phone, chat and video suite from Intermedia, priced per user.
- Only Intermedia Unite lists macOS, Windows and Android apps.
- CallTower also covers online fax.
- Intermedia Unite also covers transcription, team chat, video calls and file sharing.
- 2.2GPA
Nextiva
From $15/mo
Business phone, texting and video with an optional AI receptionist.
- Only Nextiva lists macOS, Windows, Linux, iOS and Android apps.
- CallTower also covers online fax.
- Nextiva also covers transcription, team chat and video calls.
- 2.0GPA
8x8
Paid
Cloud phone system with team chat, meetings and a receptionist console.
- Only 8x8 lists macOS, Windows, iOS and Android apps.
- CallTower also covers online fax.
- 8x8 also covers team chat and video calls.
- 1.8GPA
RingLogix
Paid
White-label phone, SIP and AI voice platform sold via partners.
- RingLogix also covers AI agents.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
10
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is CallTower free?
No. CallTower is a paid product.
What platforms does CallTower work on?
CallTower is available on Web.
Does CallTower have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. CallTower is listed for Web.
Does CallTower have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. CallTower is listed for Web.
Is CallTower open source?
CallTower is not described as open source on its own site, as read on Nov 13, 2026.
What does CallTower integrate with?
CallTower's listing names Microsoft Teams, Webex, Zoom, Five9 and Genesys Cloud.
Who makes CallTower?
CallTower is made by CallTower, Inc.
What are the alternatives to CallTower?
The closest alternatives to CallTower in our directory are RingCentral, Intermedia Unite, Nextiva, 8x8 and RingLogix.
How does CallTower compare with other business phone systems?
CallTower's GPA of 1.8 is higher than 12 of the 77 other business phone systems we grade, and level with 15.
Could I make my own version of CallTower?
To replace CallTower you would be making phone numbers and calls carried over the phone network.
Where this guide comes from
The prices, plans, platforms and features were read from CallTower’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. Graded from this listing, whose facts were read from CallTower's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by CallTower, Inc. Prices change, so check calltower.com before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- CallTower, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/calltower
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "CallTower: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/calltower
Know someone choosing between business phone systems?
Send them this guide: toolgpa.com/tools/calltower/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded business phone systems after CallTower, each with an Insider's Guide of its own.
- Business Phone Systems Insider's GuideEvery one of the 78 business phone systems we grade, compared
- Zadarma Insider's GuideCloud PBX and virtual numbers in 110+ countries, free to start3.2 GPA
- Grasshopper Insider's GuideVirtual business number on your own phone, priced per account3.0 GPA
- RingCentral Insider's GuideCloud phone system with texting, fax, video meetings and team chat3.0 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what CallTower’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. CallTower is a trademark of its owner, and this guide is not made, paid for or approved by CallTower, Inc. Prices and plans change: check calltower.com before you buy.