Scalable Internet Phone Server
Scalable Internet Phone Server
Group Members:
Project Description:
The goal of the Packet-Switched Phone Server (PPS) project is to build
a gateway between the public telephone network and a packet switching
network such as the Internet,
so that end users can make long-distance telephone calls using
existing analog phone sets rather than the computer interface.
An operational
PPS prototype has been built in the State University of New York at Stony Brook, which
is developed on a PentiumPro 200 machine running Windows NT 4.0 with
off-the-shelf computer telephony hardware from Dialogic.
The bandwidth estimation algorithm used in PPS
allows speech encoding to adapt to
the available network bandwidth, and
the packet buffering scheme minimizes
end-to-end latency.
The current PPS prototype can support at least 9 concurrent
phone conversations using LPC-10 compression algorithm,
with the worst-case end-to-end voice packet latency being 222 msec
over an Internet connection between Stony Brook, New York and
Orlando, Florida.
Publications: