We do not have a specific backup telephony service offering with PureCloud Voice today. However, I do not see why an organization will not be able to do this. Customers would need to define the mechanism of switching their numbers manually or have backup numbers which can be forwarded to PureCloud Voice. DID's are associated with individual telephony providers, so that maybe an issue. However toll free calls and/or other backup numbers can be directed to PureCloud Voice for service. Additionally customers would need to maintain their org configuration and routing within PureCloud/Voice. What do you think @Lindsay Parker ?