OpenScape Voice is a native SIP-based real-time Voice over IP server application scalable up to 100,000 users per system and a virtually unlimited number of users when OpenScape Voice servers  are networked. It’s a complete Software only Voice application runs on highly reliable, redundant and fault-tolerant hardware. It provides a complete and feature-rich set of business class features and can be deployed on premise, in a data center (as a private cloud), or as a multi-tenant hosted/public cloud solution. 

OpenScape Voice is a carrier-grade enterprise voice server solution meaning 99.999% reliability – that translates to less than approximate 5 minutes of downtime per year. The server nodes are designed in High Availability mode so that if one fails, the other server node can support 100% of the call load.