The Voice over Internet protocol or VoIP has made the long distance calling and international calling at significantly lower rates. Besides its cost saving feature, new VoIP technology has enabled IP PBX system to offer easy integration with existing system. The IP PBX system is characterised with low operating cost. In addition, this system allows a user to connect to more than forty extensions packed with all the advanced features of calling like voice mail, call forwarding, auto generated messages and screen calls. This phone system is well suited for medium and large scale organisations as it provides cost efficiency, functionality, reliability and security. Moreover, hosted PBX system allows to increase the number of ports by adding new expanding cards.

The VoIP technology of IP PBX system offers high scalability feature. The call forwarding or Find Me or Follow Me is the one of the most important feature of hosted PBX system. The call forwarding is used to route calls to some other destinations or telephone number when user is not at his initial number or busy on his number. To activate this feature, user has to give the list of phone numbers where call can be terminated. While using the VoIP PBX user can choose any incoming phone number i.e. local or international numbers for redirecting a call. This feature allows user to enjoy long distance and international call forwarding at reduced rates. In addition, if user is not available on any number then message will be put on voice mail box.

For availing services of call forwarding, users have to install virtual PBX on Linux operating system. The SIP or Session Initiation Protocol based handset used for availing benefits of IP PBX are known as SIP. The SIP function of this phone system helps to redirect phone calls over the Internet. Call transferring feature is boon for business houses who are looking for a cost efficient telephony solutions.