Setting up a new office is quick and easy. It becomes more challenging, however, when employees need to access the same applications, extensions, and data there as they do at headquarters. In such cases, a network connecting multiple offices determines whether your company operates as a single unit or whether each location remains technically isolated. Especially when it comes to telephony, Microsoft Teams, cloud applications, and central security policies, the lack of a clear architecture leads to unnecessary detours, increased support costs, and risks.
The right solution isn’t necessarily the most technically complex one. A small business with two offices has different requirements than an SME with a warehouse, a field sales team, remote workers, and international branches. The key factors are which services must be available across all locations, how critical service outages are, and who is responsible for operations.
What a Site Network Must Be Able to Do
At its core, site connectivity links local networks via secure, controlled connections. This allows employees to access central resources—such as files, line-of-business applications, ERP or CRM systems, printing services, telephony, and collaboration platforms—regardless of where they are working. Ideally, they won’t even notice in their day-to-day work which location a service is hosted from.
For management, the bottom line is the impact: standardized processes, improved accessibility, and predictable costs. For IT, the focus is on bandwidth, availability, segmentation, security policies, and an architecture that can be scaled without a complete overhaul. Both perspectives go hand in hand. A low-cost Internet connection without a security and redundancy plan can slow down operations. Conversely, an oversized solution results in ongoing costs that cannot be justified.
The benefits are particularly evident in telephony. With a centralized cloud PBX, all offices can be managed using a shared numbering plan, extensions, groups, and IVR menus. A call to the main number can be routed to the appropriate team, regardless of whether they’re working in Zurich, Bern, from home, or on the go. Phone numbers and presence rules remain consistently manageable.
Connecting multiple offices starts with day-to-day work
Before choosing between MPLS, SD-WAN, VPN, or a direct site-to-site connection, there’s one simple question to ask: Which operations must continue even if the connection is interrupted? For a medical practice, access to scheduling and phone systems may be critical. For a retail company, it’s inventory management, warehouse integration, and payment processes. In an engineering firm, large CAD files and cloud synchronization can place a heavier load on the network than traditional email communication.
Therefore, don't just track the number of workstations—track the data streams as well. How many Teams meetings are taking place simultaneously? Are Phone Calls Over the Data Line How is this managed? Do employees access local servers, a private cloud, or exclusively SaaS applications? Do guests, IoT devices, cash registers, production equipment, and employees need to be separated? The answers to these questions will determine whether each location requires full Internet access, a prioritized connection, or additional security measures.
Growth prospects should also be factored into the planning. If a third location, seasonal jobs, or a company acquisition are on the horizon, the solution should be able to accommodate new users and networks without lengthy interruptions. Standardized firewall rules, centrally managed VLANs, and a well-organized IP address plan will save time down the road.
The Right Architecture: VPN, SD-WAN, or Private Connection?
An encrypted site-to-site VPN over a business Internet connection is a sensible starting point for many small and medium-sized businesses. It securely connects locations, is relatively cost-effective, and can be easily managed using modern firewalls. This requires that the Internet connections be sufficiently stable and that the devices provide the necessary encryption capabilities.
As soon as you have multiple locations, cloud services, and prioritized applications, it’s worth taking a look at SD-WAN. With SD-WAN, data traffic isn’t simply routed through a single tunnel. The solution continuously evaluates connections and applications and can, for example, prioritize voice traffic or switch to a second connection in the event of a connection problem. This improves the user experience, but it is no substitute for a well-thought-out security strategy or sufficient bandwidth.
Private site connections or MPLS solutions may be appropriate in situations where guaranteed performance characteristics, particularly critical applications, or clearly defined service levels are required. However, they are not always the most cost-effective choice. Many companies today combine a high-quality business Internet connection with mobile backup, centrally managed firewalls, and intelligent routing. The best option depends on availability, latency requirements, locations, and budget.
Plan for redundancy where outages are costly
Not every location requires the same level of security. A sales office that is used only occasionally may be assessed differently than the corporate headquarters, a call center, or a warehouse handling ongoing order processing. For critical locations, it makes sense to have a second Internet connection that is managed as independently as possible. This could be a second landline or a 4G/5G fallback.
It is important to test the switchover scenario under realistic conditions. A backup is of little use if telephony, VPN tunnels, DNS, or critical applications do not function correctly after the switchover. For cloud telephony, it is also important to verify the voice quality achieved under load and during fallback operation. Quality of Service can prioritize voice packets, but it cannot magically create capacity where none exists.
Centralize Management of Phone Services and Microsoft Teams
Today, distributed offices expect more than just call forwarding. Employees should be reachable at their business numbers, even when they’re working in teams or changing workstations. A central phone system establishes common rules for extensions, call queues, time controls, call forwarding, and voicemail.
With native Microsoft Teams integration, Teams becomes a full-fledged telephony channel. Users make calls using their business phone number, view presence information, and remain within their familiar collaboration workflows. It should be clear which functions are controlled centrally via the PBX and how external calls are routed via SIP or Teams trunks. This avoids duplicate configurations and simplifies administration.
For companies with multiple locations, the phone number strategy is also important. A central main number conveys consistency, while local numbers can foster a sense of regional proximity. In many cases, existing phone numbers can be ported. When relocating or opening new offices, it is important to review accessibility, emergency response plans, and location information well in advance.
Don't treat security as an afterthought
Linking locations increases the attack surface. If malware spreads at one location, it must not be able to automatically access servers, telephony systems, or other networks. Segmentation is therefore not solely an enterprise discipline. Office workstations, guest Wi-Fi, VoIP, servers, printers, and IoT devices should be separated based on risk and function.
Centralized next-generation firewalls, secure VPN connections, multi-factor authentication for administrative access, and ongoing updates form the foundation. Equally important are clear lines of responsibility: Who monitors security alerts? Who adjusts firewall rules for new applications? Who documents changes? Managed services are particularly useful when internal IT resources cannot continuously monitor the network, security, and availability.
Data protection and data location should also be factored into the decision. Anyone who processes data requiring special protection needs transparent rules governing access, logging, backup, and recovery. The technical connection alone does not answer these questions.
Keep operations and costs transparent from the very beginning
The initial purchase cost is only part of the equation. Be sure to factor in Internet connections, firewall hardware, rent, licenses, mobile backup, managed services, installations, and the internal effort required for operation and troubleshooting. A centrally managed solution may cost more per month than individual devices at each location, but it often reduces sources of error and the effort required for coordination.
A smooth rollout is carried out in stages. First, existing lines, IP ranges, applications, and phone numbers are mapped. This is followed by the target architecture, security policies, and a testing plan. Critical functions such as telephony, access to central systems, and failover should be tested under real-world conditions before a full-scale rollout. Only then should additional workstations and locations be migrated.
Winet integrates business internet, secure site connectivity, firewall services, and Ayrix telephony in such a way that communication and networking do not need to be planned separately. This provides a single point of contact when it comes to new locations, team integration, or optimizing existing connections.
The best next step isn't a one-size-fits-all product package, but rather a brief assessment of your locations and workflows. Once it's clear which services really need to remain available, you can set up a network of locations that grows with your business and works seamlessly in day-to-day operations.
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