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 happens if I don't pay my bill on time? How is a SIP Trunk delivered? What is the process to have the PBX service installed?