You also have to look at it at this point of view, Avaya as a vendor does not want to sell one time perpetual licenses and chase upgrades. They want to get recurring revenue so customers don't go 5+ years without an upgrade and only get maintenance (some customers don't even pay maintenance). IP Office is a very strong PBX and has great features but in the long term Avaya does not want that to be the future of the company and that is why you always hear "Avaya is now a cloud company with ACO, CPaaS and CCaaS". Customers and Partners may want "On-Prem" PBX's but if the vendors don't sell/support it anymore (look at Cisco, Ring, Mitel, Microsoft as they are all focusing on cloud just like Avaya), it really does not matter. From a customer stand point, it does cost more money in the long term for cloud but Avaya does not want another Nortel situation where the Norstar and CS1000s do not break and customers don't upgrade for 20+ years. If you have an IP Office with a good Tech, that thing can last you 20 years without an upgrade easily but in that situation, Avaya gets revenue on the licenses and hardware one time and they don't see a dime for the next 20 years (if the customer does not pay maintenance).