  Jackson queuing networks have a lot of practical applications, mainly in
services and technologic devices. For the first case, an example are the
healthcare networks and, for the second, the computation and telecommunications
networks. Evidently the time that a customer (a person, a job, a message)
spends in this kind of systems, its sojourn time, is an important measure of
its performance, among others. In this work, the practical statistical known
results about the sojourn time of a customer, in a Jackson network,
distribution are collected and presented. And an emphasis is set on the
numerical methods applicable to compute the distribution function and the
moments.
