Seven Criteria for Phone Service Providers Put to the Test
A missed call can cost you a job. A poorly planned migration can slow down operations for hours. Anyone who Seven Criteria for Telecommunications Providers Therefore, it doesn't just evaluate and compare per-minute rates and devices. The key factor is whether the telephony solution fits the company, its workflows, and its existing IT infrastructure—both today and as the company grows, opens new locations, or implements Microsoft Teams.
For Swiss SMEs in particular, telephony has long been an integral part of their overall communications and security infrastructure. Landlines, mobile services, Teams, CRM, internet connectivity, and phone numbers must all work together seamlessly. The right provider reduces complexity, establishes clear lines of responsibility, and ensures that employees remain reachable.
Seven Criteria for Phone Service Providers That Matter
1. Availability and Call Quality in Everyday Life
A professional telephony solution must work when it’s needed: during customer calls, support calls, emergencies, or conferences with external partners. Don’t just ask for a general availability guarantee—ask about the technical infrastructure. How is voice quality monitored? Are there redundant components? How are outages detected, prioritized, and communicated?
Your own infrastructure is also part of this assessment. VoIP requires a sufficiently sized, stable business Internet connection as well as proper network prioritization for voice traffic. A provider who understands connectivity, telephony, and networking can pinpoint bottlenecks more quickly. Is the cause in the Wi-Fi, the firewall, the SIP trunk, or the phone system? Without clear troubleshooting steps, a minor glitch can quickly turn into a lengthy troubleshooting process.
For businesses with a high volume of incoming calls, it’s also worth taking a look at contingency plans. These include call forwarding in the event of an internet outage, alternative contact options, and clear escalation procedures. Even the best system is of little use if no one knows who is responsible for handling issues when a problem arises.
2. Scalability without a system overhaul
New employees, temporary teams, additional locations, or seasonal spikes in demand shouldn’t turn into a major technical headache. A modern cloud PBX allows you to flexibly customize users, extensions, groups, IVR menus, and permissions. This speeds up the process and avoids investing in capacity that won’t be needed for several years.
However, scalability does not mean that every company must necessarily move entirely to the cloud. If there are specific requirements related to on-premises systems, existing infrastructure, or internal processes, an on-premises phone system may still be a viable option. What matters is whether the provider can accurately assess both scenarios and offer a realistic migration path.
Ask specific questions: How quickly can a new workstation be set up and ready for use? Can employees working from home and those at remote offices be managed in the same way? Can call groups or queues be adjusted on short notice? A good telephony system grows with the company without placing an unnecessary burden on administration.
3. Microsoft Teams as a True Telephony Platform
Many companies use Teams for chats and meetings but continue to make calls through a separate system. This leads to disjointed experiences: contacts, presence information, call logs, and call forwarding settings are stored in different places. Anyone who wants to establish Teams as their central workspace should carefully consider how phone functionality will be integrated.
What matters is not the label „Teams integration,“ but how it is implemented. Can an employee About Teams Can you make calls using your business number? Are extensions, groups, IVR, call forwarding, and busy signals available? Is the administration easy to understand, even when organizations or locations change?
Be sure to check for additional costs as well. Some integrations require separate add-ons, external services, or SBC components that require a license. A native connection between the PBX and Microsoft Teams can simplify the architecture and make it easier to plan for ongoing costs. Winet, for example, relies on direct integration of the Ayrix PBX with Teams, eliminating the need for additional Teams telephony add-ons per user.
4. Security and Data Protection as Part of Telephony
IP telephony is an IT service. Therefore, it must be protected according to the same principles as other business-critical applications. Of particular importance are encrypted signaling and voice transmission, controlled access rights, secure administrative access, and protection against misuse and billing fraud.
A Session Border Controller (SBC) can play a central role in this process. It isolates and protects the telephony environment from external networks, manages connections, and reduces the attack surface. Whether a dedicated SBC is required depends on the environment: It is often advisable for complex locations, Teams integrations, or high compliance requirements. For smaller, fully managed cloud environments, the security architecture may look different.
Also ask how backups, updates, and security alerts are handled. Are changes documented? Who is granted administrative privileges? And where are call logs, configuration data, and connection records stored? Data protection isn’t achieved through a single feature, but through clear processes and responsibilities.
5. Phone Numbers, Number Portability, and Professional Availability
Your main number is part of your brand. When switching providers, it must be retained, as must the direct extensions for departments and employees. Number porting should therefore not be treated as a secondary issue, but should be included in the project plan from the very beginning.
An experienced telecommunications provider will determine, prior to the transition, who the numbers are assigned to, what contracts are in place, and what deadlines apply. It will schedule the porting date so that operations continue uninterrupted and will establish a fallback plan. This is particularly important when multiple locations, international phone numbers, or fax and specialized services are involved.
Flexible numbering plans are equally valuable. Companies can use local Swiss numbers to establish a regional presence, international numbers for foreign markets, or premium custom numbers to enhance brand recognition. It is crucial that number management remains transparent and is not tied to individual devices or locations.
6. Transparent costs instead of low introductory prices
A low monthly price is only attractive if it includes all the services you need. Therefore, don't just compare license costs—compare the total costs over several years: connections, call rates, flat rates, hardware, installation, migration, support, security components, and any additional licenses.
When it comes to billing, there is no one-size-fits-all model. Companies with a high volume of domestic calls often benefit About Flat Rates and fixed costs that are easy to budget for. Businesses with low call volume, many international destinations, or highly fluctuating call volume may be better off with per-minute billing. A good provider will explain these differences openly instead of just selling a standard package.
Be cautious with vague terms such as „unlimited.“ Ask about fair-use policies, excluded destinations, and charges for mobile or international calls. The contract term, cancellation periods, and fees for reducing the number of users should also be discussed. Cost control comes from clear rates and transparent bills.
7. Personalized Support and Clear Project Accountability
When it comes to telephony, in the event of a problem, it's not just a ticketing system that matters, but a contact person, one that knows your local area. It is precisely during migrations, phone number porting, or service disruptions outside of business hours that a provider’s true commitment to service becomes apparent.
Before signing the contract, clarify who will lead the project, how the implementation will proceed, and what services are included in the operation. These typically include design, configuration, testing, training, and a controlled go-live. In more complex environments, firewall rules, VLANs, SIP trunks, LDAP connectivity, CTI, and CRM and ERP interfaces must also be taken into account.
Managed services can significantly reduce the workload on an organization’s internal IT department. They are particularly useful when there is no in-house specialist available for telephony, networking, and security, or when multiple locations need to be coordinated. Companies with a strong IT team, on the other hand, often deliberately choose a model that involves more in-house management. Both approaches are valid, as long as responsibilities, response times, and points of contact are clearly defined.
This is how a comparison becomes a sound decision
Don’t just ask for three price quotes. Describe your current situation: number of users, locations, percentage of remote work, existing phone numbers, Microsoft 365 usage, internet connection, security requirements, and desired integrations. The more clearly these requirements are formulated, the easier it will be to compare the quotes.
A responsible provider also points out limitations. Perhaps a full-featured Teams telephony solution isn’t necessary for a small business. Perhaps a growing company needs a solid network foundation first before introducing new IP phones. Or a phased migration is safer than a hard deadline for the transition. Honest advice saves you from having to make corrections later on.
The right telephony solution should make employees' jobs easier and ensure that customers can reach you reliably. When technology, cost, security, and support all come together, telephony transforms from an administrative burden into an infrastructure your company can rely on every day.