How is a HPBX delivered? The HPBX can be delivered via one of our three transportation mediums (Metro-E or direct fibre, Metro-G or Aggregated fibre or via Microwave) - together with a transport medium provided by an alternate service provider. Related articles What equipment is used to deliver the PBX services? What is a PBX? What is the process to have the PBX service installed? How to get additional services for my PBX How is a DIA delivered?