# OpenScape Business S — Server-Based UC PBX (Software)

URL: https://www.promark.tr/en/products/openscape-business-s
Category: PBX & UC
Family: [OpenScape Business](https://www.promark.tr/en/products/openscape-business)

The pure software member of the OpenScape Business family — up to 1500 IP subscribers with UC Suite functionality. X1–X8 cabinets stop at 500 subscribers; beyond that, Business S takes over. Runs on a Linux server; fully virtualized with VMware vSphere or MS Hyper-V, operated in your own data centre or hosted (private cloud). Public network connectivity via ITSP (SIP); X-series cabinets join the network as gateways where digital/analog trunks are required.

## Key features

- Pure software PBX — max 1500 IP subscribers, UC Suite functionality.
- The only OSBiz option above the 500-subscriber ceiling of X1–X8.
- Linux server; full virtualization with VMware vSphere / MS Hyper-V.
- In your own data centre or hosted — private cloud keeps data control with you.
- Public network via ITSP (SIP); X-series cabinets act as gateways for digital/analog trunks.
- Promark: server/VM sizing, installation, licensing and network design.
- Current software release is OpenScape Business V4 (30.07.2026): X systems with a V3 mainboard and Business S move to V4 via a standard software upgrade; existing licences remain valid.

## Specifications

- **Type:** Pure software UC PBX
- **Subscribers:** Max. 1500 IP (with UC Suite)
- **Platform:** Linux server
- **Virtualization:** VMware vSphere, MS Hyper-V
- **Deployment:** Own data centre or hosted (private cloud)
- **Public network:** ITSP (SIP); X-series gateway for ISDN/analog trunks
- **Family position:** Scenarios beyond X1–X8 (max. 500 subscribers)

## Use cases

- Single central PBX for organizations with 500+ subscribers.
- Moving the PBX into virtualized IT infrastructure as a VM.
- Central software + X gateways at branches in multi-site networks.

## For a quote and BOM

https://www.promark.tr/en/contact · +90 312 544 09 15 · destek@promark.tr