Traditional telephone exchanges rely on physical lines and hardware that are expensive to maintain and slow to adapt. Cloud telephony replaces those physical lines with calls that travel over a secure internet connection – which means no hardware cabinets, no engineer visits, and no waiting weeks to add a new number. For small and medium-sized businesses, two options stand out: Microsoft Teams Calling, which adds phone calls to the platform your team already uses, and 3CX, a flexible system that gives you more control over how everything is set up.
What Is VoIP and How Does It Differ From Traditional Telephone Lines?
VoIP (Voice over Internet Protocol) is a technology that routes business calls through your existing internet network instead of separate physical phone lines.
Switching to VoIP changes how a growing business operates in four key ways:
- Calls run entirely on your data network, which cuts the cost of separate phone lines
- Employees stay reachable on their professional numbers from home or the office
- Your phone system connects directly with your daily business tools and client management software
- You manage features like call routing and voicemail from one central place
What Is the Difference Between Microsoft Teams Calling and 3CX?
Most SMBs choose between two cloud telephony platforms. The right choice depends on your existing setup and how much flexibility your team needs.
Microsoft Teams Calling works best when your company already runs on Microsoft 365. It puts external calls directly into your existing workspace and shows real-time status updates for colleagues. Users interact primarily through softphones in the Teams app, and you manage everything through the Microsoft 365 admin dashboard.
3CX is the better choice when you need a highly customisable setup and want to select your own telecom provider. It connects with many different third-party systems and customer databases, supports both digital softphones and physical desk phones, and uses its own platform interface with independent settings.
When Should You Choose Teams Calling Over 3CX?
- Choose Teams Calling when your business already uses Microsoft 365 and you want calls integrated natively with Outlook and the rest of the Microsoft environment
- Choose 3CX when you need more control over your telecom provider, want to connect to third-party systems, or require support for physical desk phones
What Do You Need to Switch to Cloud Telephony?
Moving away from a traditional exchange requires five technical components:
- A stable internet connection with enough bandwidth for business traffic
- A telephony provider for external calls using modern routing such as SIP trunking
- Number porting to move your existing business numbers to the new platform
- Configuration of user profiles, call routing, and business hours
- Optional hardware such as physical phones or professional headsets
What Does the Migration From a Classic Exchange to Cloud Telephony Look Like?
A structured migration keeps your business running throughout the switch. The process follows six phases:
- Assessment: Review your current setup and identify what your users need
- Platform selection: Choose Teams Calling or 3CX based on your workflow and IT environment
- Number porting preparation: Prepare the documentation needed to move your existing numbers safely
- Technical configuration: Build the cloud solution and configure routing and office hours
- Testing: Verify call flows and audio quality before going live
- User guidance: Show employees how to use the new features so they feel confident from day one
FAQ
Can we keep our existing physical office phones when switching to cloud telephony?
Most older phones do not work with cloud systems without additional hardware. As a result, most companies switch to softphones or internet-compatible desk phones.
What happens to our phone system if our internet connection is temporarily unavailable?
Cloud telephony requires an active connection. To stay reachable, you can set up a backup internet line or configure the system to forward calls to mobile numbers automatically when the main connection drops.
Can employees use their business number from different locations?
Yes. Users access business calls through apps on laptops or smartphones from any location with an internet connection.
How long does the phone number transfer process take?
The timing depends on your current setup and provider. The actual switch takes place during off-peak hours to prevent any downtime.
