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Cloud PBX vs On-Premise IP-PBX: Making the Right Choice
Understanding the Two Models
Cloud PBX (also called hosted PBX) places the phone system server in a provider's data center, with IP phones at the customer site connecting over the internet. The provider manages all infrastructure, maintenance, and updates. Customers pay monthly subscription fees per user or extension.
On-premise IP-PBX places the phone system appliance at the customer's location. The organization owns the equipment, manages configuration, and maintains the system. Redstone REX series IP-PBX systems follow this model, providing organizations with full control over their communication infrastructure.
Control and Customization
On-premise IP-PBX provides maximum control and customization. Organizations can configure any feature, integrate with any system, and implement custom call flows without provider limitations. This control is valuable for organizations with unique requirements, strict compliance mandates, or existing infrastructure that needs specific integration.
Cloud PBX offers less customization since providers standardize features across all customers. While this standardization simplifies support and ensures consistency, it limits organizations needing configurations outside the provider's standard offerings. Organizations should evaluate whether their requirements fit within typical cloud PBX capabilities.
Cost Structure Comparison
Cloud PBX follows operational expenditure (OpEx) model with predictable monthly costs. No large upfront investment is required, making it accessible for organizations with limited capital budgets. Monthly fees typically range from $15-40 per user including features, maintenance, and sometimes domestic calling.
On-premise IP-PBX follows capital expenditure (CapEx) model with upfront hardware and licensing costs. Redstone REX series appliances represent one-time investments with 5-7 year useful life. Ongoing costs include SIP trunk service, maintenance agreements, and internal IT staff time. Over 5+ years, on-premise total cost is typically lower than cloud for organizations above 50-100 users.
Reliability and Internet Dependency
Cloud PBX depends entirely on internet connectivity. If internet service is interrupted, all phone service stops unless backup connectivity is in place. Voice quality depends on internet connection quality - bandwidth, latency, and jitter between the customer site and provider data center all affect call quality.
On-premise IP-PBX continues operating during internet outages for internal calls between extensions. PSTN connectivity through analog gateways or PRI provides outbound calling even when internet is unavailable. This resilience is valuable for organizations where communication continuity during outages is critical.
Security and Compliance
On-premise IP-PBX keeps all voice traffic within the organization's network. Call recordings, voicemail, and configuration data reside on equipment the organization controls. This control simplifies compliance with data sovereignty requirements, industry regulations, and internal security policies.
Cloud PBX stores voice data in provider data centers. While reputable providers implement strong security, organizations must verify that provider security meets their compliance requirements. Some regulated industries including healthcare (HIPAA) and financial services have specific requirements that not all cloud providers can meet.
Scalability Considerations
Cloud PBX scales easily - adding users is a simple administrative task with corresponding monthly cost increase. This flexibility suits organizations with rapid growth or seasonal staffing variations. Reductions are equally simple, though contracts may lock in minimum user counts.
On-premise IP-PBX scales within the appliance's capacity. Redstone REX series scales from 100 to 10,000 extensions across different models. Adding users within capacity is a configuration task. Exceeding capacity requires hardware upgrade or additional appliances. Organizations should choose systems with growth headroom to avoid premature replacement.
Making the Choice
Choose cloud PBX when: upfront capital is limited, IT resources are minimal, rapid scaling is needed, locations are distributed without central IT, or standard features meet all requirements. Cloud models work well for small businesses, startups, and satellite offices.
Choose on-premise IP-PBX when: long-term cost optimization matters, customization is needed, compliance requires local control, communication continuity during internet outages is critical, or the organization has IT resources to manage infrastructure. On-premise suits larger organizations, regulated industries, and organizations with unique requirements.
Redstone Systems, Inc. founded in Delaware, USA in December 2002, has been the ODM vendor for many well-known communications companies, serving the Southeast Asian market. In 2020, Redstone Systems will begin to return to the North America market with its self-developed brand.
Redstone has a complete product line of intelligent voice gateways, providing IP-PBXs, analog VoIP gateways (FXS/FXO), digital VoIP gateways (E1/T1), border appliances, and session boundary controllers (SBCs).
With advanced technology in digital signal processor (DSP), speech coding and speech processing, as well as efficient operational tools such as cloud remote management, auto provisioning, Redstone gateways are widely used in markets of enterprise communications, cloud communications, call centers, operators’ IMS/SIP trunks, bringing users friendly, efficient and reliable communication experience.
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