Can I keep my current business phone number?

Most VoIP providers support 'number porting,' which allows businesses to transfer their existing numbers to the new service.

Do I need to buy new phones for a VoIP system?

Not necessarily. Many cloud VoIP services are designed to function via apps on existing smartphones or computers, though dedicated VoIP desk phones can be purchased if preferred.

What happens if my internet goes down?

Many VoIP services offer 'failover' features, such as automatically routing calls to a mobile number or an external voicemail service when the primary internet connection is lost.

Cloud-Based VoIP vs. Traditional Desk Phone Systems for Small Teams

Question: Should a small business use a cloud-based VoIP service (e.g., Zoom Phone) or a traditional desk phone system for a 5-person team?

Prepared by the ChoiceScore Research Desk · Editor-approved for the curated library · Reviewed July 17, 2026

Recommended Choice Score: 70/100

Direct answer

For a 5-person team, a cloud-based VoIP service is generally recommended over traditional PBX systems due to lower upfront capital expenditure, inherent geographic flexibility, and the ability to integrate voice services into existing digital collaboration suites.

Summary

Small businesses must evaluate the trade-offs between legacy on-premise PBX systems and cloud-based VoIP. Cloud VoIP operates on a subscription model, utilizing existing internet infrastructure to deliver voice services. This eliminates the need for physical line installation and dedicated hardware maintenance. For a 5-person team, this approach provides access to features like auto-attendants and mobile app integration, which historically required expensive hardware. This report analyzes the operational impact, cost structures, and technical requirements of transitioning to a cloud-based communication architecture.

Choice Score breakdown

Cost Efficiency 95/100 — Cloud VoIP typically lowers initial capital expenditure by removing the need for on-site hardware.
Scalability 90/100 — Adding new lines in a cloud environment can be performed via administrative dashboards in minutes.
Reliability 75/100 — Reliability is dependent on internet stability, which may vary based on local ISP infrastructure.

Best for / Not best for

Best for

Remote or hybrid teams
Businesses looking to minimize upfront capital expenditure
Companies already using digital collaboration suites

Not best for

Businesses with extremely unstable broadband internet
Operations requiring legacy analog fax or specialized security hardware incompatible with IP protocols

Scenarios

Cloud VoIP (Optimistic - Illustrative) (85% likely)
Full migration to a cloud provider with high-speed fiber internet, enabling seamless remote work. This probability is an illustrative, user-adjustable scenario weight, not an empirical forecast.
Traditional System (Status Quo - Illustrative) (10% likely)
Maintaining or installing a legacy PBX system with physical desk phones and copper lines. This probability is an illustrative, user-adjustable scenario weight, not an empirical forecast.
Hybrid/Pessimistic (Illustrative) (5% likely)
Cloud VoIP implementation hampered by poor local internet quality. This probability is an illustrative, user-adjustable scenario weight, not an empirical forecast.

Calculations

Metric	Result	Formula
Annual Cloud VoIP Cost (Illustrative)	1,200 USD/year	monthly_per_user_cost × number_of_users × 12
Estimated Hardware Savings (Illustrative)	2,500 USD	traditional_setup_cost - cloud_setup_cost
5-Year Total Cost of Ownership (Cloud - Illustrative)	6,000 USD	annual_cloud_cost × 5

Pros & cons

Pros

Geographic flexibility: VoIP allows users to manage calls from existing devices, including smartphones and computers, regardless of physical location.
Unified communications: Modern VoIP services often integrate voice calling with video meetings, chat, and file sharing within a single platform.
Reduced hardware overhead: Cloud services remove the necessity for dedicated physical phone lines and complex on-premise PBX hardware.

Cons

Internet dependency: Call quality and availability are strictly tied to the performance and stability of the business's internet connection.
Power reliance: Unlike traditional analog lines that may function during power outages, VoIP requires both internet and power to operate.
Staff training: Employees may require time to adapt to new digital interfaces and software-based call management features.

Assumptions

Average VoIP Cost: 20 USD/user/month — Illustrative assumption for modeling purposes; actual pricing varies by provider.
Traditional Setup Cost: 2,500 USD — Illustrative assumption for hardware and installation; actual costs depend on specific vendor quotes.
Illustrative scenario probability — Cloud VoIP (Optimistic - Illustrative): 85% — A user-adjustable modeling weight used to compare scenarios; it is not a measured probability or forecast.
Illustrative scenario probability — Traditional System (Status Quo - Illustrative): 10% — A user-adjustable modeling weight used to compare scenarios; it is not a measured probability or forecast.
Illustrative scenario probability — Hybrid/Pessimistic (Illustrative): 5% — A user-adjustable modeling weight used to compare scenarios; it is not a measured probability or forecast.

Practical next steps

Assess current internet bandwidth and latency to ensure the network can support real-time voice traffic.
Audit team communication requirements to determine if physical desk phones are necessary or if softphone applications suffice.
Compare at least three VoIP providers, focusing on features like auto-attendant, CRM integration, and mobile app functionality.
Conduct a pilot test of the chosen service with one user to verify call quality and feature set before full-team deployment.
Configure call routing, voicemail, and auto-attendant settings to match business hours.
Provide training sessions for the team on the desktop and mobile applications to ensure efficient use of the new system.

Methodology

This analysis compares the operational models of cloud-based VoIP versus traditional PBX systems. It evaluates cost structures, scalability, and technical requirements for a 5-person team. Calculations are based on user-adjustable assumptions to provide a framework for decision-making.

Sources

Sources support specific claims; they do not replace our analysis. Read the research and source standards.

FAQ

Can I keep my current business phone number?: Most VoIP providers support 'number porting,' which allows businesses to transfer their existing numbers to the new service.
Do I need to buy new phones for a VoIP system?: Not necessarily. Many cloud VoIP services are designed to function via apps on existing smartphones or computers, though dedicated VoIP desk phones can be purchased if preferred.
What happens if my internet goes down?: Many VoIP services offer 'failover' features, such as automatically routing calls to a mobile number or an external voicemail service when the primary internet connection is lost.

Related decisions

Disclaimers

This report is for informational purposes only and does not constitute professional financial or IT consulting advice.

Pricing and features mentioned are illustrative and may vary by provider and region.

Scenario probabilities are modeling weights and are not empirical data.