This paper presents the design and implementation
of Asterisk server, which serves as the local exchange for
placing voice and video calls within a private Wi-Fi cloud and
legacy networks, that is, with the Public Switch Telephony
Network (PSTN). The model is accessible within the area of a
university campus and allows only those mobile phones and
PCs’ to connect to the Asterisk server which are registered
with the wireless network. The work proposed in this paper
has an added feature for placing the voice and video calls on
mobile phones hence increasing the mobility of a user. The
model is successful in carrying out voice and video calls on
Android supported handhelds connected with the wireless
network and PCs connected with both wired LAN and wireless
LAN. Further, every user is provided with his own extension
number that can be used to connect to the outside world.