Direct answer
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With CCaaS, a provider hosts and runs the contact center software on infrastructure it manages, and you pay a recurring fee to use it. With an on-premises contact center, the software runs on servers in your own building and your team operates them. The difference shows up in who maintains the system, what unit you pay in, how agents sign in and who repairs it when calls stop.
Genesys defines CCaaS as a cloud-based delivery model that provides the software, infrastructure and tools for handling customer contacts. The provider installs the updates and looks after the hardware. Atlantech's contact center service, which runs on the Xima platform, puts the arrangement in one line: "Cloud-based delivery means we keep an eye on your contact center platform and provide maintenance remotely." A hosted service also starts without buying contact center servers, and Atlantech aims to finish implementation 30 to 45 days after a quote is approved. We describe the service model more fully in what CCaaS is.
On premises, that work belongs to your IT staff or a support partner you hire. They patch the servers and plan the upgrades, and capacity for the busiest season has to be bought in advance. In return, you decide when changes happen and what the system connects to. NICE sells a cloud platform, and its own comparison of the two models still credits on-premises systems with "greater control over infrastructure and security" and with custom integrations to older or proprietary software.
Running the servers doesn't give you the whole calendar, though. The vendor still decides how its software is sold and for how long each release is supported. Cisco ended the sale of perpetual licenses for Unified Contact Center Enterprise on August 1, 2022, and set July 31, 2024 as the last date of support for those licenses. The product continued under Cisco's Flex subscription, and customers who needed more licenses or renewed support were sent there. So an on-premises system can carry a subscription too, and its support dates belong in the plan from the first day.
Traditionally, an on-premises system was a purchase. You paid for hardware and perpetual licenses up front, then for a support contract and the staff time to run the system. Some vendors now sell on-premises software by subscription, as the Cisco example shows, so the up-front share varies. The servers and the people who run them remain your cost either way.
CCaaS is a recurring fee, and the unit of that fee changes from one provider to the next. Genesys Cloud lists four plans from $75 to $240 per named user per month, billed annually, and offers concurrent and hourly licenses as well. Five9 lists its Core plan at $159 per concurrent seat per month with a 50-seat minimum. Amazon Connect charges $0.038 per voice minute plus telephony, with no minimums and no seat licenses.
Atlantech doesn't publish a price. It builds a quote after a 15-to-30-minute discovery call, for a service whose page lists voice and web chat licenses, skills-based routing, an IVR, queue callback, real-time wallboards, historical reporting and CRM integrations. A hosted quote covers a specific set of features like that one, and the features of a modern contact center sorts out which ones belong in yours.
The unit decides who pays for idle time. A named-user license belongs to one person and costs the same whether that agent talks for six hours or one. A concurrent license counts the users logged in at the same time, so agents on shifts that don't overlap can work under the same count. Per-minute pricing charges only for time on a call.
Suppose a desk is comparing Genesys Cloud CX 2 at $115 per named user per month with Amazon Connect at $0.038 a minute. The Genesys seat costs $1,380 a year. At Amazon's rate, $1,380 buys about 36,300 voice minutes, which is 145 minutes on each of 250 working days. On those two listed platform charges alone, the break-even is about 145 minutes of talk time per agent per day. Amazon bills telephony separately and the two products include different features, so the figure shows how the two units behave and stops short of a total cost.
A cloud platform is reached over the internet, so an agent's location becomes a login detail. Xima's agent client runs in a web browser and needs no installation. An agent signs in at the organization's login page and takes calls on a phone built into that page.
On-premises systems can support remote agents too, and each vendor does it in its own way. Cisco's Mobile Agent feature is one documented approach. It lets an agent take contact center calls on any outside phone, including a home line or a mobile. Cisco's guide says the call processing for those agents "uses more server resources and therefore reduces the maximum number of supported agents," and it lists features they don't get, such as Web Callback. On that system, a remote team draws on capacity the company has already bought.
With CCaaS, a platform outage is the provider's to fix, and the contract says what you can get back. Amazon Connect's service level agreement targets 99.99% monthly uptime in each region. If uptime falls short, the customer can claim a service credit under the agreement's conditions, and the agreement calls that credit the customer's "sole and exclusive remedy." So the contract can refund part of the bill, and the calls that went unanswered stay your loss.
A cloud contact center also depends on the connection between your agents and the provider. If the office internet goes down, the platform keeps running, but the agents in that office can't reach it until a backup connection takes over or they log in from another location. Genesys used to cover this gap with equipment at the customer's site. It ended support for that feature, called remote survivability, on June 30, 2025. Since then, a Genesys premises site that loses its internet connection no longer plays stored IVR menus or routes queue calls to agents. Atlantech sells business fiber and phone service alongside its contact center service, so one company can be responsible for the circuit, the phone numbers and the platform.
On premises, the repair runs through your own staff and whatever support contracts you hold for the hardware, the software and the carrier circuit. How fast it goes depends on those contracts and on the spare parts and skills you keep on hand.
The differences side by side
| What changes | On premises | CCaaS |
|---|---|---|
| Where the software runs | Servers in your building | Infrastructure the provider manages |
| Who maintains it | Your IT staff or support partner, within the vendor's support dates | The provider |
| What you pay | Traditionally hardware and perpetual licenses up front, then support and staff time; some vendors now sell subscriptions | A recurring fee per user, per seat or per minute |
| A platform outage | Repaired by your staff and your support contracts | Repaired by the provider, with a bill credit you can claim under the contract |
A system on a perpetual license that still receives support and security updates has already been paid for, and it may connect to older software that a cloud platform would need custom work to reach. Those are sound reasons to keep it. The case weakens as the release nears its last date of support, because a forced upgrade then belongs on the owned side of the comparison. At that point, compare the upgrade quote with a hosted quote for the same agents and features, and convert both to the same unit before you read the totals.
Genesys
“Contact Center as a Service (CCaaS) is a cloud-based delivery model that provides the software, infrastructure and tools needed to manage customer interactions across channels.”
NICE
“On-premise: hosted and maintained in your own data centers... Greater control over infrastructure and security... Custom integrations with legacy or proprietary systems.”
Genesys
“Genesys Cloud CX 2 $115 USD per user/month, billed annually.”
Five9
“Prices above are per concurrent user and usage-based pricing may apply, with a minimum of 50 seats.”
Talkdesk
“$165USD Per user, Per month (omnichannel and WFM).”
Amazon Web Services
“$0.038 per voice min (standard telephony rates apply)... No minimums, no long-term contracts, pay for what you need.”
Amazon Web Services
“Your sole and exclusive remedy for any unavailability or non-performance or other failure by us to provide Amazon Connect Customer is the receipt of Service Credits.”
Amazon Web Services
“AWS is responsible for protecting the infrastructure that runs all of the services offered in the AWS Cloud... Customer responsibility will be determined by the AWS Cloud services that a customer selects.”
Genesys Cloud Resource Center
“When a Genesys Cloud organization is created, it is deployed in a core region based on the organization's location.”
Genesys Cloud Resource Center
“consumption of cached IVR flows and the ability to route ACD calls to active agents. Also AI features that require real-time media processing will be unavailable.”
Cisco
“Customers who need additional licensing and / or to renew software support should move to FLEX Contact Center.”
Cisco
“Mobile Agent enables an agent to use any PSTN phone... Mobile Agent call processing uses more server resources and therefore reduces the maximum number of supported agents.”
Avaya
“no new fixes or security updates will be made available... After this event, no Hardware parts replacement will be available.”
Genesys
“CIM Platform 8.0, 8.1, 8.5 - End of support: April 30, 2025.”
PCI Security Standards Council
“Storage of card validation codes or values... in any form of digital audio recording - for example, .wav or .mp3 files - after authorization is therefore a violation of this requirement.”
Legal Information Institute, Cornell Law School (reproducing the Code of Federal Regulations)
“A covered entity may permit a business associate to create, receive, maintain, or transmit electronic protected health information on the covered entity's behalf only if the covered entity obtains satisfactory assurances... that the business associate will appropriately safeguard the information.”
Genesys
“This graphic was published by Gartner, Inc. as part of a larger research document and should be evaluated in the context of the entire document. The Gartner document is available upon request from Genesys.”