I want to connect my existing landline telephone to VitalPBX for all outgoing and incoming calls.
The VitalPBX installation is currently running on one of my laptops and serving extensions.
Please suggest any hardware requirement for the same.
The hardware requirements depend on how much call traffic you will have if you will have call recordings, call monitoring (Sonata Switchboard), and any other application.
The minimum requirements for VitalPBX are:
Try a Grandstream HT801 or Cisco SPA112. One of my clients uses a Grandstrea, HT801 for their fax line, and for fun we plugged an old landline phone into the other line and gave it its own extension.