What Is Cloud PBX? Complete 2026 Guide

Q: Are Cloud PBX and Hosted PBX the same

In practice, Cloud PBX and Hosted PBX usually refer to the same thing, a phone system hosted on the provider's server, not the customer's. Some providers also use the terms Virtual PBX or IP PBX as a Service, which deliver similar results.

Q: How much internet bandwidth does Cloud PBX need

Recommended bandwidth is around 100 Kbps per concurrent call (G.711 codec). A 50-person office with 10 simultaneous calls should have at least 1 Mbps dedicated to voice. Enterprise providers typically use a dedicated Pure VoIP Network rather than sharing bandwidth with data traffic.

Q: If the internet goes down, will Cloud PBX stop working

Yes, IP phones in the office will not work without internet. However, calling via the Cloud PBX mobile app continues to work over cellular. Quality providers also offer internet failover or 4G backup for critical office sites.

Q: Can I port my existing phone numbers to Cloud PBX

Yes, through number porting. The Cloud PBX provider coordinates with carriers (NT, True) to transfer your DID numbers. The process typically takes 5 to 10 business days with minimal downtime.

Q: How does Cloud PBX differ from SIP Trunk

Cloud PBX is the phone system (PBX) hosted in the cloud. SIP Trunk is the voice signaling path connecting a PBX to a carrier. Cloud PBX usually bundles SIP Trunks for an end-to-end solution, but SIP Trunks are also sold separately for organizations with their own PBX.

2026-05-07 8 min readSIPPER Team

Cloud PBX is a private branch exchange (PBX) phone system that runs on cloud infrastructure instead of on-premise hardware. This guide explains what Cloud PBX is, how it differs from traditional PBX, the key features of modern enterprise Cloud PBX, how to choose a provider, and typical pricing.

What Is Cloud PBX

Cloud PBX (Cloud-based Private Branch Exchange) is a phone system that runs on cloud infrastructure rather than physical hardware in your office. Organizations access it through the internet or a dedicated voice network (Pure VoIP Network), paying a monthly subscription instead of investing in hardware upfront.

Unlike traditional on-premise PBX, which requires hardware in the office server room, Cloud PBX moves the entire system to the provider's data center. This reduces maintenance burden and is ready to use immediately on day one.

How Cloud PBX Differs From Traditional PBX

The key differences are server location, flexibility, and cost structure.

Server location: traditional PBX is on-premise / Cloud PBX is in a data center
Investment: traditional PBX requires upfront hardware purchase (high capex) / Cloud PBX is monthly subscription (opex)
Scaling: traditional PBX needs new wiring to add extensions / Cloud PBX adds extensions instantly via admin portal
Remote work: traditional PBX does not support it / Cloud PBX works anywhere via mobile app or softphone
Updates: traditional PBX requires technician visits / Cloud PBX firmware updates automatically
Power outage: traditional PBX is offline / Cloud PBX still works through mobile

Key Features of Modern Cloud PBX

Modern enterprise Cloud PBX is more than just a phone system. It's a Unified Communications (UC) platform combining multiple tools.

UC Client (Linkus, Web Client)

Applications for desktop (Windows / macOS), mobile (iOS / Android), and web browser. Used for receiving calls, team chat, video calling, file sharing, and seeing colleagues' presence in real time. Call flip lets users switch devices mid-call.

Voice AI (Transcription, Summary, Neural TTS)

Built-in AI that converts call audio to text (call transcription) and generates automatic summaries (call summary), reducing note-taking work for sales and support teams.

Neural TTS (AWS Polly) creates IVR prompts, greetings, and after-hours messages without recording audio. Supports 100+ voices in 40+ languages.

Contact Center (Queue Management)

Built-in call center with queue panel showing real-time agent status, wallboard for large displays, SLA tracking, skills-based routing, supervisor listen / whisper / barge, and outbound dialer.

Omnichannel Messaging

Unified inbox for WhatsApp Business, SMS, Facebook Messenger, and website live chat. Route messages into agent queues, transfer chats, and escalate to voice calls in one click.

How to Choose a Cloud PBX Provider

Before selecting a Cloud PBX provider, evaluate these 5 critical areas.

Voice network: dedicated Pure VoIP Network vs general internet, affects call quality
Carrier interconnection: direct to NT and True, or reselling from another provider
PDPA compliance: are call recordings and CDR stored in-country
Platform: Yeastar, 3CX, Asterisk, or custom, does it integrate with your existing CRM
Local partner: certification level, on-site support availability in Thailand

Typical Cloud PBX Pricing

Cloud PBX in Thailand typically starts at 199 to 500 THB per extension per month, depending on plan and feature tier.

Basic plans cover standard PBX, Linkus UC, team chat, and IVR. Enterprise plans add CRM integration, Voice AI, omnichannel, and contact center.

Initial setup fee is typically 5,000 to 50,000 THB depending on extension count and migration complexity.

Who Is Cloud PBX For

Cloud PBX suits organizations of all sizes, from startups to large enterprises.

New offices without an existing PBX
Businesses that need remote or hybrid work support
Organizations expanding branches who don't want hardware in every location
Small IT teams that don't want to maintain on-premise servers
Businesses that need new features (Voice AI, omnichannel) which legacy systems don't support
Organizations using Microsoft Teams that need PSTN calling via Direct Routing

Frequently Asked Questions

Are Cloud PBX and Hosted PBX the same

How much internet bandwidth does Cloud PBX need

If the internet goes down, will Cloud PBX stop working

Can I port my existing phone numbers to Cloud PBX

How does Cloud PBX differ from SIP Trunk

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