Today, Businesses that deal in long distance or international calling have opted for IP architecture; user can add additional phone connections and extensions. It allows user to share a certain number of external phone lines and switches between VoIP users on local lines. Calling on IP Telephony is cheaper as it is based on packet switching protocol that allows the user to share data, voice, video or images through single line. Thus, irrespective of locality and mobility user can communicate over network. IP-PBX solution offers the services which help to reduce the monthly telephony charges with more of voice quality feature; this service is offered by the Internet telephony

The most important point of advanced IP PBX over traditional PBX is as follows:

1. Easy to install.

2. No complex wiring is required for VoIP PBX solutions. This is because to make the communication in their other offices at lower cost. Well, business communication requires reliability, security, functionality and scalability in his dealings; and this has been made possible with emergence of VoIP technology. With VoIP calling infrastructure set-up, users can make in-house and out-house calling through IP network at a minimal rate and higher call efficiency. Thus, advanced system of calling through Internet increases the cost efficiency and productivity.

To take benefit of virtual PBX systems, user has to set up basic architecture of PBX server that includes one or more SIP phones or VoIP phones and a VoIP gateway, providing

1. Low cost of operation

2. Cheaper long distance and international calls

3. Additional phone connection and extensions can be added

4. Facilitates hot desking and roaming

5. Easy usability and better manageability

With the time, many businesses are making plans to switch to VoIP phone services and hosted IP PBX system to gain benefit of it. Well, investing in an IP PBX makes sense for companies big and small as it requires start up cost. Before replacing the PSTN to advanced PBX solutions with Internet telephony, a user must be thorough with the services and its usability.