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 the process to have the PBX service installed? What is a PBX? What is the process to have the SIP Trunk service installed? How to troubleshoot my DPLC / Point to Point?