If the phone system only works in the office, setting up new employees is a time-consuming process, or Microsoft Teams remains disconnected from the landline network, communication can quickly become an operational risk. VoIP Telephony for Businesses It doesn't simply solve this problem by offering cheaper call minutes. When properly planned, it connects phone numbers, employees, locations, remote work, and collaboration within a manageable infrastructure.
For Swiss SMEs and organizations with multiple locations, three questions are of particular importance: Will we remain reliably reachable? How do we keep costs and administrative tasks under control? And how do we integrate telephony into the tools our team already uses every day?
How VoIP Telephony Is Actually Changing Business
VoIP stands for Voice over IP, which means making phone calls over an IP network. Calls are no longer routed through a traditional ISDN or analog connection, but rather through the existing Internet or on-premises network. For employees, making phone calls remains a familiar experience. Behind the scenes, however, the architecture becomes significantly more flexible.
A modern cloud PBX replaces or supplements the traditional phone system in the server room. Extensions can be managed centrally, call groups can be customized with a click of the mouse, and calls can be forwarded based on time, location, or availability. A new workstation therefore does not necessarily require a new phone line. Often, all that’s needed is a user license, an IP phone or a softphone on the computer, and a properly configured internet connection.
The benefits are particularly evident when changes occur: a team relocates, a department expands, a new location is added, or employees regularly work remotely. Instead of operating a separate system at each location, everyone uses the same communication framework. This reduces administrative overhead, provided that, Network, Security, and Permissions are carefully planned from the very beginning.
VoIP telephony for businesses is more than just a SIP trunk
A SIP trunk connects the phone system to the public telephone network. It is a key component, but not a complete solution. Those who simply procure connections without considering the entire communication chain often end up transferring existing problems to a new technology.
A fully functional solution includes the telephone system or cloud PBX, phone numbers, an internet connection, end devices, security components, and an operational plan. For organizations with multiple locations, site connectivity and clear rules for emergency calls are also required. For home office workstations, it must be ensured that voice quality and availability do not depend on a random Wi-Fi signal.
The desired range of features also determines the architecture. A small company often needs a professional main number, automated announcements, time-based call forwarding, and a call group. A larger company also needs IVR menus, call queues, presence information, LDAP integration, CTI for CRM, or integration with an ERP system. Both sets of requirements can be met with VoIP, but not with the same configuration or the same level of support.
Cloud PBX or On-Premises System: Choosing the Right Deployment Model
A hosted phone system is the practical choice for many companies. The platform runs in a data center, updates and maintenance are handled by the provider, and new extensions can be set up without requiring any changes to a local server. This results in predictable monthly costs and makes the solution highly scalable.
A local PBX can be a good option if there are specific integrations, custom network requirements, or internal compliance requirements. It offers more control over operations, but also requires clearly defined responsibilities for updates, backups, security, and replacement parts. Those who do not wish to establish their own operational structure for this purpose should realistically assess the ongoing costs—not just the purchase price.
In practice, a hybrid approach is also possible. Existing systems can be migrated gradually, while new teams can start working with cloud features right away. It is crucial that numbering, routing rules, and user management remain centrally traceable. A phased migration reduces risk, but must not result in two permanently separate worlds.
Using Microsoft Teams as a Full-Fledged Telephony Channel
Many companies already use Microsoft Teams for chats, meetings, and files. Nevertheless, employees often rely on a separate desk phone or cell phone for external calls. This wastes time, creates media discontinuities, and makes it difficult to ensure consistent availability.
With native Teams integration, Teams becomes a telephony workspace. Employees can make calls using their business phone number directly from Teams, answer calls from queues, and view presence and call forwarding rules, depending on the configuration. The external phone number remains the same, even if someone is working from home or at another location.
From a technical standpoint, how this integration is implemented is crucial. Solutions that rely on additional add-ons, separate licensing models, or external SBC components may be suitable, but they increase costs and operational overhead. A directly integrated PBX solution reduces the number of interfaces and simplifies administration. Winet natively connects the Ayrix PBX to Microsoft Teams without requiring separate Teams add-ons or SBC components that incur licensing fees for this integration.
However, Teams does not automatically replace every requirement. Reception desks, contact center functions, DECT phones in warehouses or production facilities, and specialized devices still need to be properly integrated. Good planning therefore starts with the workflows, not with the question of which app is currently available.
Call quality is determined by the network, not the phone itself
A high-quality IP phone cannot compensate for poor network conditions. Voice is sensitive to packet loss, delays, and fluctuations in transmission time. When backups, video conferences, or cloud synchronization are putting a strain on the connection, you’ll notice it first during a call.
For business VoIP telephony, voice traffic must therefore be given priority on the network. Quality of Service can prioritize voice packets over less time-sensitive data traffic. Separate VLANs improve clarity and security. For central locations, a business Internet connection with adequate bandwidth and clearly defined services is usually more appropriate than a connection designed primarily for personal use.
Redundancy is also a business decision. A single, small location may only need automatic call forwarding to cell phones in the event of an Internet outage. For a headquarters, a service center, or an internal sales department, a second Internet connection, a separate mobile fallback solution, or redundant routing may be appropriate. The right option depends on the actual cost incurred by one hour of unavailability.
Security and data protection are key considerations in telephony planning
VoIP systems are part of the IT infrastructure and must be protected accordingly. Unsecured SIP access points, weak passwords, or uncontrolled international dialing can lead to misuse and high charges. Unsecured administrator accounts and a lack of updates are equally critical.
A Session Border Controller (SBC) controls and protects the connection between the telephony environment and external networks. It can secure call flows, ensure compatibility, and block unauthorized access. In addition, firewall rules, separate network segments, role-based permissions, and regulated patch management are standard features.
Data protection also applies to the handling of call data. Call logs, recordings, and voicemails contain business-related information. Companies should clearly define who is authorized to access this data, how long it is stored, and in which country it is processed. Recordings, in particular, require additional clear legal and organizational guidelines.
Seamless number portability for customers and partners
For many companies, their existing main phone number is an important part of their identity. It appears on vehicles, brochures, websites, and invoices. When switching to VoIP, there’s no need to lose it. Through number porting, Swiss and international numbers can be transferred to the new system.
The critical issue isn't the porting process itself, but the preparation. Number blocks, contract details with the current provider, desired activation dates, and transition routing must all be correct. A detailed numbering plan is especially worthwhile when there are multiple locations: Which number belongs to which department? Which extensions will be retained? What happens to former employees’ numbers?
A migration should be carried out according to a clear cutover plan. This includes testing incoming and outgoing calls, configuring emergency contact information, providing information to employees, and designating a specific point of contact on the switchover day. This ensures that what could be a hectic transition becomes a controlled operational handover.
Compare costs realistically instead of just per-minute rates
VoIP can reduce communication costs, but a thorough cost analysis goes beyond the price per minute of talk time. Other relevant factors include connection fees, PBX licenses, flat rates or per-minute billing, end devices, Internet access, security components, migration, and ongoing support.
Flat rates make sense for teams with consistently high call volumes and destinations that are easy to predict. If usage is low or there are many specific destinations, per-minute billing may be more cost-effective. International calls, mobile numbers, and value-added services should be clearly itemized to avoid any surprises later on.
Internal overhead is just as important. If the IT department has to process tickets every time to change a call forwarding or set up a new employee, this results in costs beyond the phone bill. Well-managed user administration and clear self-service permissions reduce this very overhead without losing control.
How to Ensure a Smooth Implementation Without Unnecessary Friction
The best place to start is by taking stock of the current situation. This involves recording existing numbers, locations, devices, internet connections, special features, and applications such as Teams, CRM, or door intercom systems. Next, user groups are defined: reception, office workstations, mobile employees, service, production, and executives often have different requirements.
This is followed by a target vision that includes routing rules, permissions, security policies, and an operating model. A pilot project involving a single department or location helps identify practical issues early on. Only then should the full-scale migration take place. Training should be concise and specific: answering and transferring calls, managing voicemail, and responding correctly in the event of a malfunction.
A telephony solution is effective when it goes largely unnoticed in day-to-day operations but works when it matters most. By planning requirements, the network, and operations together, you create not just a new system, but a communications foundation that grows with your business.
Current
Business Internet with an SLA for Your Business
Using Microsoft Teams with Landline Telephony
Skills shortage in the ICT sector
The value of competent support in telecommunications
Ayrix Pricing Workshop
