Whilst the industry momentum is going towards adopting Microsoft Teams as the successor to Skype for Business, there will still be organizations that have yet to fully migrate to Teams and may continue to use Skype for Business for the interim term, particularly for companies that have invested in and leveraging Microsoft Phone System with SFB Online and hybrid voice. Whether its using CCE or Skype On-Prem Cloud Hybrid, their users are able to make PSTN calls via a local SBC with the associated SIP Trunk or E1/T1 lines. For these environments, it is desirable to retain PSTN calling in the event that the WAN connection to Office365 becomes unavailable. In this blog post, we walk through the steps on how to configure a Ribbon SBC1000 for PSTN failover such that if the WAN connection to O365 is disrupted, Skype certified IP Phones will lose connectivity to SFB Online but yet still be able to make PSTN calls via a secondary SIP connection to the SBC |