BT VoIP Phone System Guide | Features, Pricing & Review

BT's Move to VoIP Telephony

BT has been transitioning its business customers from traditional PSTN and ISDN lines to VoIP (Voice over IP) for several years. The UK-wide PSTN switch-off — the retirement of the copper telephone network — has accelerated this migration. BT's answer to the post-PSTN world for business customers comes in two main forms: BT Cloud Phone for smaller organisations and BT Cloud Voice for mid-market businesses.

Understanding what you are getting with each product, and how the pricing and features compare against the wider UK VoIP market, is essential before making a decision.

BT Cloud Phone: Features and Pricing

BT Cloud Phone is BT's entry-level hosted VoIP system. It is designed for small businesses — typically those with fewer than 20 users — and provides a cloud-based PBX without any on-site hardware requirement.

Core Features

• Virtual receptionist (auto-attendant): Greets callers and routes them to the correct extension or department using voice prompts.
• Hunt groups: Rings multiple extensions simultaneously or in sequence, ensuring calls are answered.
• Voicemail to email: Voicemail messages are delivered as audio attachments to designated email addresses.
• Call recording: Available on higher-tier plans; useful for compliance, training, and dispute resolution.
• Mobile app: Make and receive business calls on iOS or Android using your business number.
• Call analytics: Basic reporting on call volumes, answer rates, and missed calls.

BT Cloud Phone Pricing

BT Cloud Phone is typically priced at £15–£22 per user per month, depending on the plan tier selected and whether BT broadband is included in the bundle. Hardware — IP desk phones — costs an additional £80–£200 per device upfront.

This places BT Cloud Phone at the higher end of the SME VoIP market. Comparable hosted systems from providers such as Gamma Horizon, 3CX, and bOnline offer equivalent functionality at £8–£15 per user per month.

BT Cloud Voice: Features and Pricing

BT Cloud Voice is a more capable hosted telephony platform aimed at larger organisations. It is built on a wholesale carrier platform and delivered through BT and its reseller partners. Key differences from Cloud Phone include greater user scalability, more advanced call management features, and third-party integration options.

Additional Features Over Cloud Phone

• CRM integrations: Connects with Salesforce, Dynamics, and other CRM platforms to log calls and display caller information.
• Advanced call analytics: Detailed reporting dashboards, wallboard displays, and call centre statistics.
• SIP trunking: For businesses that want to connect an existing on-premise PBX to BT's carrier network.
• Teams integration: Some versions of BT Cloud Voice support Microsoft Teams via direct routing, enabling Teams to be used as the calling interface.

BT Cloud Voice Pricing

BT Cloud Voice is typically priced through negotiated contracts. Indicative pricing is £12–£25 per user per month, depending on features, user count, and contract length. Discounts for volume are available, though the baseline cost remains above many independent VoIP providers.

BT VoIP System Pros and Cons

Advantages

• Managed by the UK's largest telecoms provider — significant infrastructure and network capacity
• Single supplier option for broadband and voice reduces administrative overhead
• Well-defined support processes and escalation paths
• Active PSTN migration management — BT will handle the technical transition for existing customers

Disadvantages

• Higher cost per user than most dedicated VoIP providers
• 24-month contract terms with limited early exit provisions
• Feature development pace is slower than specialist VoIP platforms
• Support quality for smaller accounts can be inconsistent
• BT Cloud Phone has a user cap that can constrain growing businesses

How BT's VoIP Compares to Alternatives

The UK VoIP market is competitive. The table below gives a broad comparison of BT's products against key alternatives:

• BT Cloud Phone: £15–£22/user/month — good for very small businesses on BT broadband
• Gamma Horizon: £12–£18/user/month — widely used by UK SMEs, strong uptime SLAs
• 3CX: £8–£14/user/month — flexible, feature-rich, popular with businesses wanting configuration control
• RingCentral: £15–£25/user/month — enterprise-grade features, particularly strong CRM integration
• Microsoft Teams Phone: £6–£12/user/month licence + £5–£9/user/month calling plan — best for Microsoft 365 users

For most SMEs, an independent VoIP provider delivers better value than BT unless the single-supplier convenience is a critical priority.

Making the Right Decision

BT's VoIP products are not bad — they work reliably, they are managed by a credible infrastructure provider, and the migration path from legacy BT lines is straightforward. However, paying a premium for the BT brand when the UK VoIP market offers comparable quality at lower cost is hard to justify unless there is a specific commercial reason to stay with BT.

AMVIA works with businesses to assess their telephony requirements and compare VoIP options across the full market — including BT — to find the right solution at the right price.