Ribbon Communications last year released Ribbon Connect, a cloud-based service that facilitates a rapid, yet flexible hybrid telephony scenario in which telephony users can connect to both a PBX and Microsoft Teams Phone System.
This differs from call forking, which all Microsoft Teams-compatible session border controllers (SBC) support. Ribbon Connect provides a capability to easily transfer calls between PBX and Teams users as well as providing Teams telephony presence status to the PBX.