3CX vs Zoom Phone: Which Business Communication Platform Should Thai Businesses Choose in 2026?

Different philosophies, different outcomes

3CX and Zoom Phone are not simply competing products in the same category. They represent two fundamentally different philosophies about how business telephony should work.

3CX is a software PBX platform. It can run on a server in your office, on a VPS in any data center, or hosted in the cloud by a partner like SIPPER. It connects to the PSTN through SIP trunks of your choosing, integrates with open SIP hardware, and gives your IT team direct control over every call routing rule, extension, and configuration.

Zoom Phone is a cloud-only, fully managed telephony layer built on top of Zoom's unified communications platform. There is no server to manage, no SIP trunk to configure, and no call routing logic that your team maintains directly. Zoom handles the infrastructure; you log in to Zoom and make calls.

Understanding that distinction is the starting point for any meaningful comparison.

Pricing: how the two models compare

Pricing in Thailand varies based on plan, user count, and exchange rates, but the current reference ranges give a useful picture.

**3CX pricing** is based on simultaneous call channels. A 3CX Pro 8-channel plan through SIPPER runs approximately ฿2,066 per month (approximately USD 56/month), covering up to 8 concurrent calls and an unlimited number of registered extensions. The 16-channel and 32-channel plans scale accordingly. For organizations with 20 to 50 users making calls at ordinary business volumes, an 8- or 16-channel plan is typically sufficient.

**Zoom Phone pricing** is per user per month. The Zoom Phone Pro plan is approximately USD 13.32 per user per month (approximately ฿490 per user at current rates). For a 20-user organization, that is approximately ฿9,800 per month. For a 50-user organization, approximately ฿24,500 per month.

At low user counts, 3CX is significantly less expensive. As user counts grow, the per-channel model means 3CX cost grows only if concurrent call volume requires more channels, not simply because headcount increases. The crossover point depends on call patterns, but for most Thai SME deployments, 3CX delivers lower monthly cost at equivalent feature levels.

The comparison shifts somewhat when factoring in PSTN connectivity. Zoom Phone includes PSTN calling through Zoom's own carrier infrastructure in supported countries. 3CX requires a separate SIP trunk subscription. SIPPER's Pure VoIP Network SIP Trunk plans start at approximately ฿500 to ฿800 per month for a small deployment, which remains well below Zoom Phone's per-user rate once user count reaches 10 or more.

Control vs simplicity

This is the trade-off that matters most for organizational fit, and it runs in opposite directions for the two platforms.

**3CX gives you control.** Every call routing rule is configurable. IVR menus, time-based routing, ring groups, call queues, call recording policies, emergency numbers, and failover paths are all under your administration. For organizations with specific telephony requirements, legal recording obligations, or complex multi-site routing needs, that control is not optional. It is essential.

The trade-off is that 3CX requires someone to manage it. Initial setup requires technical competence. Ongoing maintenance requires attention to firmware updates, SIP trunk configuration, and system health. A managed 3CX deployment through SIPPER removes most of that burden, but the platform still has more operational surface area than Zoom Phone.

**Zoom Phone gives you simplicity.** The admin console is clean and straightforward. Users are provisioned in minutes. Number porting, call routing, voicemail, and basic IVR are all managed through a browser-based interface that most IT administrators can navigate without specialized training. For organizations without dedicated IT staff, or where the primary goal is getting phone calls working reliably without building a telephony practice, Zoom Phone delivers results with minimal friction.

The trade-off is reduced flexibility. SIP trunk selection is not available in Zoom Phone. You use Zoom's carrier. Bringing your own SIP trunk, choosing your PSTN provider, or optimizing international call routing through a specialized carrier is not supported. If Zoom's pricing or quality for calls to certain destinations is not competitive, you have no alternative path.

SIP trunk flexibility: the critical differentiator for SIPPER customers

For Thai businesses that care about call costs and quality, SIP trunk flexibility is the most practically significant difference between 3CX and Zoom Phone.

3CX supports any standards-compliant SIP trunk. SIPPER operates its own Pure VoIP Network, which provides direct-to-carrier connectivity for calls within Thailand and competitive international rates through optimized routing. A 3CX deployment connected to SIPPER's SIP trunk benefits from:

• Local Bangkok and Thai provincial call termination through SIPPER's own network
• Competitive rates for calls to SIP destinations (free within the SIPPER network)
• No per-user per-month call bundling that forces you to pay for capacity you do not use
• Full flexibility to route calls through the most cost-effective path

Zoom Phone locks PSTN connectivity to Zoom's own carrier. In Thailand, Zoom Phone operates through partner infrastructure. Rates and quality are controlled by Zoom, not by your organization.

For organizations making significant volumes of outbound calls, or running Contact Center operations where call cost is a meaningful line item, 3CX with SIPPER SIP trunking provides clear cost advantages over Zoom Phone.

Integration and ecosystem

**Zoom Phone** integrates deeply with the broader Zoom ecosystem: Zoom Meetings, Zoom Team Chat, Zoom Webinars, and Zoom Contact Center. If your organization is already standardized on Zoom for video meetings and internal collaboration, adding Zoom Phone creates a unified communication layer with minimal additional onboarding. The Zoom App on desktop and mobile handles everything from a single interface.

For organizations not already on Zoom, the Zoom ecosystem does not offer a meaningful integration advantage. The integration story is primarily intra-Zoom.

**3CX** takes an open approach. The 3CX App connects to any CRM supporting webhook or REST APIs, including Salesforce, HubSpot, Zoho, Microsoft 365, and Google Workspace. 3CX integrates with Microsoft Teams via direct routing, which means Teams users can make and receive PSTN calls through 3CX without paying Microsoft's Calling Plan rates. For organizations using Teams for internal communication and wanting to avoid Microsoft's telephony pricing in Thailand, a 3CX + SIPPER SIP Trunk combination is a cost-effective alternative.

Video conferencing

This is one area where Zoom holds a clear advantage. Zoom's video conferencing platform is the best-known and most widely used in Thailand's business community. Meeting quality, participant capacity, breakout rooms, and enterprise controls are mature and well established.

3CX includes a video conferencing feature built into the platform. It functions for small to medium meetings and handles screen sharing and recording. However, it does not match Zoom's video meeting quality or feature depth, and it lacks Zoom's ecosystem of scheduling integrations and hardware room systems.

For organizations where video conferencing is a primary daily use case, Zoom's video platform is the stronger choice. For organizations where voice calling is the primary requirement and video meetings are occasional, 3CX's built-in feature is adequate without adding another subscription.

When to choose 3CX

3CX is the right platform for organizations that need control over their telephony, want to optimize call costs through SIP trunk selection, have multi-site deployments with complex routing requirements, or are integrating telephony with business systems that require open API connectivity. It is also the right choice for organizations already using Yeastar (since SIPPER can manage both), or for businesses that want their own hosted PBX with full configuration access.

When to choose Zoom Phone

Zoom Phone is the right platform for organizations already standardized on Zoom for meetings and collaboration, where telephony is a secondary requirement, and where IT simplicity takes priority over cost optimization. It is also practical for organizations with very small teams (under 10 users) where the per-user pricing is acceptable and the administrative overhead of a PBX is not warranted.

How SIPPER helps

SIPPER deploys and supports 3CX V20 for Thai businesses as a managed hosted service on SIPPER's infrastructure, connected to SIPPER's own Pure VoIP Network for cost-optimized PSTN calling. Our 3CX Advanced Certified Engineer provides configuration, support, and ongoing management for customers who want a professional telephone system without the operational burden of managing it internally.

For organizations evaluating Zoom Phone, SIPPER provides honest guidance on where Zoom Phone fits and where it does not. We do not default to recommending the platform we profit from most. We recommend the platform that fits your requirements.

Contact SIPPER for a current pricing comparison and a deployment recommendation based on your team size, call volume, and existing communication tools.