Deployment of departmental intercom using IP telephony

The past decades we have witnessed a great progress towards applications of the wireless communication. It includes speech/music transmission, computer related voice/music transmission. Wireless communication have been used in telephony such as cordless telephone, mobiles and Voice over IP (VoIP) is one of the most exciting new developments emerging within the telephony market. We are aware about the traditional PBX system. Traditional PBX systems can be replaced by IP PBX system in a cost effective way. Voice over IP (VoIP) has been implemented using different useful tools. One of the most efficient open source PBX systems is Asterisk PBX. Asterisk is released as open source under the GNU general public license (GPL) platform for IP PBX deployments. This paper provides architecture and deployment of IP PBX system using Asterisk.