This paper looks first at the background to the development of intelli
gent networking concepts and then tracks this development to the advan
ced intelligent networks (AINs) of today. The network architecture and
basic nodal functions are explained, and a brief review given of the
essential intelligent network building blocks, namely the IN (intellig
ent network) Call Model and the enhanced CCITT No. 7 signalling system
. Typical intelligent network services are examined and the tutorial f
inishes with a review of the latest IN standards.