Discontinuation of support for Session Border Controllers in Exchange Online Unified Messaging

We have a hybrid cisco/Lync/SfB environment with Hybrid Exchange and we have managed to retarget the Cisco UM through the Lync/SfB infrastructure to Exchange UM online using Sip Dial Plans with managed sip code on the FE's. Cisco environment dials an allocated pilot number which is a simple ExUMContact entry.