The onsite PBX is NOT dead. We sold a 20 extension Yeastar S-Series solution with ISDN cards as the client was still in contract with BT. Once the contract ends we will port the number to SIP and do a quick config of the PBX to add the SIP trunks. NO new hardware will be required, and it can be even done remotely.
Client will save over £3500 against equivalent hosted solution with the same features over 3 years. Even more savings year 4 on wards
