Abstract:
With the rapid growth of information and communication technology,
telecommunication plays an important role to operate business organization smoothly.
Nowadays, business organization uses traditional public switched telephone network
(PSTN) system for voice communication and data network for e-mail and other data
transfer related task. The recurring cost of maintaining such dual system is usually
very high.
As a remedy of this problem, we have developed an IP telephony system that can be
used for voice as well as data in a cost effective way for a single site business
organization. The IP telephony delivers a superset of the advanced PSTN services
using IP phones and IP based access, transport and control network. The developed
system supports the full functionality of existing PBX system.
We setup a fully functional IP Telephony system using Session Initiation protocol and
H.323 protocol. We have used Asterisk open source PBX and soft phones to minimize
the cost of implementation. Our fully functional IP Telephony system includes the
ability to make phone calls from IP phones to IP phones and PSTN phone to IP phone
vice versa.
