This is a device allowing a user to make VoIP calls using session initiation protocol (SIP). SIP is a telecommunication technology developed as a fast, easy standard for delivering IP-based data, voice, and video communications.
Virtual PBX or Hosted PBX is offered by a telephone company and can free your business from investing in the costly hardware or a complex business phone system. Virtual PBX means that every service is processed via a telephone company offering a service with their own hardware and software.