OpenScape Business V3 complements MS Teams with powerful telephony capabilities such as Call
Centers, AutoAttendant, DECT, etc.

OpenScape Business supports “Microsoft Teams Interworking” via native SIP trunking towards a
Microsoft certified SBC for Direct Routing and requires a Networking license.
Direct Routing allows the integration of Teams infrastructure into existing on-premise telephony
system. Teams users are enabled to use on-premises telco lines or SIP trunks to make and receive
calls instead of using Microsoft Carrier Services via Calling Plans.

All information and installation Guidelines can be found on https://wiki.unify.com/images/4/4f/How_To_Configure_OSBiz_MS_Teams_Interworking.pdf