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Choosing an IP-PBX means matching platform capacity to real site requirements rather than buying more than you need or leaving no room to grow. The Redstone REX series includes models sized for different environments, from small offices to distributed enterprise networks. This guide compares the lineup by typical use case, not by raw specifications alone.
Understanding the Range
The REX family is built on a common software platform, which means configuration concepts, management interfaces, and feature behavior carry over from one model to another. The differences are in capacity, physical form factor, and redundancy options. Organizations can start with a smaller model and grow within the family without retraining administrators.
Model Positioning
| Model | Best For | Typical Environment |
|---|---|---|
| REX20 | Small offices and branch sites | Up to a few dozen extensions, single location |
| REX200 | Mid-size businesses and multi-site branches | Hundreds of extensions, networked sites |
| REX1000 | Large enterprises and high-density sites | Large user populations, contact centers, campuses |
REX20: Small Site Foundation
The REX20 is designed for locations that need a full-featured phone system without enterprise capacity. Small offices, retail stores, medical practices, and school branch sites fit here. It delivers the same extension management, voicemail, auto-attendant, and SIP trunking features as larger models, scaled to a compact footprint and modest concurrent-call volume.
REX200: The Multi-Site Workhorse
The REX200 is the most common choice for mid-size organizations and distributed sites. It supports larger extension counts, more concurrent calls, and peer-to-peer networking with other REX systems. For organizations with headquarters plus branches, the REX200 provides the capacity and networking features needed to operate as one communication system across locations.
Common REX200 deployments include multi-branch retail chains, regional healthcare groups, manufacturing plants with satellite offices, and hospitality properties with back-of-house requirements.
REX1000: Enterprise and High-Density
Large campuses, contact centers, and organizations with thousands of users need a platform built for scale. The REX1000 extends the REX architecture to high-density environments with redundant configuration options and the capacity to serve as a core node in a multi-site network. It is typically deployed where call volume, user count, or integration density exceeds the REX200 profile.
How to Choose
Start by measuring actual concurrent calls, not just employee headcount. A site with two hundred employees rarely has two hundred simultaneous calls. Next, consider growth over the expected platform lifetime, the number of sites that must network together, and the volume of analog devices that will connect through gateways. Redstone provides sizing guidance to help organizations match measured demand to the right model rather than overspending on unused capacity.
For a personalized recommendation, contact Redstone for a sizing assessment based on your current call patterns and growth plans.
Get a REX sizing recommendationRedstone 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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